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  • 1.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Doran, N. J.
    Chalmers University of Technology, Sweden.
    Forysiak, W.
    Chalmers University of Technology, Sweden.
    Nijhof, J. H. B.
    Chalmers University of Technology, Sweden.
    Power dependence and accessible bandwidth for dispersion-managed solitons in asymmetric dispersion maps1998Rapport (Övrigt vetenskapligt)
    Abstract [en]

    We investigate how the parameters of dispersion managed solitons depend on the asymmetry of the dispersion map. Using the variational approach and numerical simulations we show that asymmetric maps can increase the accessible bandwidth in the normal average dispersion regime and equalise the power in adjacent WDM channels.

  • 2.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Doran, N. J.
    Aston University, UK.
    Forysiak, W.
    Aston University, UK.
    Nijhof, J. H. B.
    Aston University, UK.
    Power dependence and accessible bandwidth for dispersion-managed solitons in asymmetric dispersion maps1998Ingår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 34, nr 21, s. 2054-2056Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The authors investigate how the parameters of dispersion managed solitons depend on the asymmetry of the dispersion map. Using the variational approach and numerical simulations it is shown that asymmetric maps can increase the accessible bandwidth in the normal average dispersion regime and equalise the power in adjacent WDM channels.

  • 3.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Analysis of coherent and incoherent interactions of amplitude shifted solitons in optical fibres1995Ingår i: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 52, nr 5, s. 544-553Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Nonlinear interaction between pulses can severely reduce the bit-rate of an optical communication system. One way of reducing this interaction is amplitude shifting of consequtive pulses. In the present work a detailed analytical and numerical investigation is made of the coherent and incoherent interactions between two soliton pulses of unequal amplitudes. For the case of coherent interaction the obtained expressions for the pulse parameters in terms of initial phase and amplitude differences give a clear and explicit prediction of the reduction of the interaction strength for unequal soliton amplitudes. A comparison with numerical simulation results shows good agreement. For the case of incoherent soliton interaction it is found that the dependence of the interaction strength on the amplitude difference is weak. 

  • 4.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Analysis of coherent and incoherent interactions of amplitude shifted solitons in optical fibres1998Rapport (Övrigt vetenskapligt)
    Abstract [en]

    Nonlinear interaction between pulses can severely reduce the bit-rate of an optical communication system. One way of reducing this interaction is amplitude shifting of consecutive pulses. In the present work a detailed analytical and numerical investigation is made of the coherent and incoherent interactions between two soliton pulses of unequal amplitudes. For the case of coherent interaction the obtained expressions for the pulse parameters in terms of initial phase and amplitude differences give a clear and explicit prediction of the reduction of the interaction strength for unequal soliton amplitudes. A comparison with numerical simulation results shows good agreement. For the case of incoherent soliton interaction it is found that the dependence of the interaction strength on the amplitude difference is weak.

  • 5.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Quiroga-Teixeiro, M. L.
    Chalmers University of Technology, Sweden.
    Karlsson, M.
    Chalmers University of Technology, Sweden.
    Self-phase modulation in dispersion compensated optical fibre transmission systems1996Ingår i: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 130, nr 1-3, s. 153-162Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An analysis is made of the influence of self-phase modulation on optical fibre communication systems where the chromatic dispersion is compensated for by a dispersion compensation fibre. In particular we derive a simple and useful expression for the optimal fibre length in the presence of nonlinearities.

  • 6.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, Dan
    Chalmers University of Technology, Sweden.
    Lisak, Mietek
    Chalmers University of Technology, Sweden.
    Quiroga-Teixeiro, Manuel L.
    Chalmers University of Technology, Sweden.
    Karlsson, Magnus
    Chalmers University of Technology, Sweden.
    Self-phase modulation in dispersion compensated optical fibre transmission systems1998Rapport (Övrigt vetenskapligt)
    Abstract [en]

    An analysis is made of the influence of self-phase modulation on optical fibre communication systems where the chromatic dispersion is compensated for by a dispersion compensation fibre. In particular we derive a simple and useful expression for the optimal fibre length in the presence of nonlinearities.

  • 7.
    Anders, Berntson
    et al.
    Chalmers Univ of Technology, Sweden.
    Anderson, Dan
    Chalmers Univ of Technology, Sweden.
    Lisak, Mietek
    Chalmers Univ of Technology, Sweden.
    Teixeiro, Manuel L.Quiroga
    Chalmers Univ of Technology, Sweden.
    Karlsson, Magnus
    Chalmers Univ of Technology, Sweden.
    Self-phase modulation in dispersion-compensating systems1996Ingår i: Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, IEEE , 1996, s. 405-406Konferensbidrag (Refereegranskat)
    Abstract [en]

    The effects of SPM in a dispersion-compensation system are investigated. An explicit and compact formula is presented for the optimal length of the DCF. In particular, it is shown that the order of the fibers is important when SPM is considered. Using precompensation SPM effects can improve system performance. A qualitative comparison between the analytical predictions and previously presented experimental results show good agreement.

  • 8.
    Anders, Berntson
    et al.
    Aston University, UK; Chalmers University of Technology, Sweden.
    Doran, N. J.
    Aston University, UK.
    Forysiak, W.
    Aston University, UK.
    Nijhof, J. H. B.
    Aston University, UK.
    Power dependence of dispersion-managed solitons for anomalous, zero, and normal path-average dispersion1998Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 23, nr 12, s. 900-902Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We determine the power dependence of dispersion-managed solitons on map strength and average dispersion, using a combination of numerical simulations and the variational approach. In particular, we investigate the behavior near zero dispersion and identify the region of existence of dispersion-managed solitons in the average normal-dispersion regime.

  • 9.
    Anders, Berntson
    et al.
    Aston University, UK.
    Doran, N. J.
    Aston University, UK.
    Forysiak, W.
    Aston University, UK.
    Nijhof, J. H. B.
    Aston University, UK.
    Power dependence of dispersion-managed solitons for anomalous, zero, and normal path-average dispersion1998Rapport (Övrigt vetenskapligt)
    Abstract [en]

    We determine the power dependence of dispersion-managed solitons on map strength and average dispersion, using a combination of numerical simulations and the variational approach. In particular, we investigate the behavior near zero dispersion and identify the region of existence of dispersion-managed solitons in the average normal-dispersion regime.

  • 10.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Malomed, B. A.
    Tel Aviv University, Israel.
    Dispersion management with filtering1999Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 24, nr 8, s. 507-509Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    With regards to their potential to improving the pulse-based regimes in optical communication networks, dispersion-managed solitons in a fiber link including guiding filters and compensating gain were investigated. Combining the variational approximation and the perturbative treatment of the filtering and gain, stationary regimes are predicted. Among other features, the minimum map strength necessary for the existence of the pulses when path-averaged dispersion (PAD) is zero or normal is absent, rather, a minimum necessary normalized power for any PAD exists.

  • 11.
    Anders, Berntson
    et al.
    Chalmers University of Technology, Sweden.
    Malomed, Boris A.
    Chalmers University of Technology, Sweden.
    Dispersion management with filtering1998Rapport (Övrigt vetenskapligt)
    Abstract [en]

    We present results of analytical and numerical consideration of the pulses in a model of a DM fiber link including the fixed-frequency filters and compensating gain, both taken in the distributed approximation. Combining the variational approximation and perturbative treatment of the filtering and gain terms, we predict stationary propagation regimes. The most important new features are the absence of the minimum DM strength necessary for the existence of the pulses in the case when the average dispersion is nil or normal, and the existence of a minimum necessary normalized power in this case. These features are well corroborated by direct simulations.

  • 12.
    Anders, Berntson
    et al.
    Ericsson Telecom, Sweden.
    Martensson, J.
    Ericsson Telecom, Sweden.
    Westlund, M.
    Ericsson Telecom, Sweden.
    Influence of pulse width and dispersion period on 40 Gbit/s dispersion-managed RZ transmission2000Ingår i: Conference on Lasers and Electro-Optics (CLEO 2000)Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An overview is given on the numerical investigation of the influence of the dispersion period and the pulse width on the performance of a dispersion-managed (DM) transmission link. Results from studying a transmission link of alternating pieces of standard fiber (SF) and dispersion compensating fiber (DCF) are discussed.

  • 13.
    Anders, Berntson
    et al.
    Ericsson Telecom AB, Sweden.
    Popov, S.
    Ericsson Telecom AB, Sweden.
    Vanin, E.
    Ericsson Telecom AB, Sweden.
    Jacobsen, G.
    Ericsson Telecom AB, Sweden.
    Karlsson, J.
    Ericsson Telecom AB, Sweden.
    Polarisation dependence and gain tilt of Raman amplifiers for WDM systems2001Ingår i: Conference on Optical Fiber Communication, Technical Digest Series, 2001, nr 1, s. MI2/1-MI2/3Konferensbidrag (Refereegranskat)
    Abstract [en]

    We investigate the polarisation dependence and gain tilt of Raman amplifiers for WDM systems. We find no polarisation dependence of the gain for backward propagating pumps. Results from experiments on commercial 32-channel WDM system are presented, highlighting the effect of gain tilt and pump depletion.

  • 14.
    Anderson, D.
    et al.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Exact Schrödinger Solitons in Optical Fibers in the Presence of Space Dependent Damping or Amplification1999Ingår i: Physica scripta. T, ISSN 0281-1847, Vol. 82, s. 42-43Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is shown that the nonlinear Schrödinger equation describing pulse propagation in optical fibers in the presence of a properly space-tailored damping or amplification is exactly integrable. A simple transformation of variables is given which transforms the inhomogeneous nonlinear Schrödinger equation into the standard form with constant coefficients, thus generating new explicit bright and dark soliton solutions in the cases of anomalous and normal dispersion, respectively.

  • 15.
    Anderson, D.
    et al.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Quiroga-Teixeiro, M.
    Chalmers University of Technology, Sweden.
    Zamanakos, G.
    Chalmers University of Technology, Sweden; Caltech,USA.
    Fedele, R.
    Università di Napoli Federico II, Italy.
    Miele, G.
    Università di Napoli Federico II, Italy.
    A variational approach to spherical aberrations in the thermal-wave model for beam dynamics in charged particle accelerators1998Ingår i: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 58, nr 6, s. 608-612Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A direct variational approach involving trial functions and Ritz optimization, which has previously been found very useful in nonlinear optics, is applied to analyze the effects of spherical aberrations on the focusing properties of charged particle beams in particle colliders. As compared to conventional perturbation theory, the variational approach provides a simple and physically clear analysis. Explicit expressions are given for the transverse particle beam density, the spot size, and the luminosity reduction factor at the interaction point, in good agreement with the perturbative results. 

  • 16.
    Anderson, D.
    et al.
    Chalmers University of Technology, Sweden; INFN, Italy.
    Fedele, R.
    INFN, Italy.
    Vaccaro, V.
    INFN, Italy.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Chalmers University of Technology, Sweden.
    Johanson, S.
    Chalmers University of Technology, Sweden.
    Modulational instabilities within the thermal wave model description of high energy charged particle beam dynamics1999Ingår i: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 258, nr 4-6, s. 244-248Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Within the thermal wave model (TWM) description, an investigation was made of the longitudinal instability properties of a coasting high energy charged particle beam, where the interaction between the beam and its surroundings is characterized in terms of a complex impedance. The analysis is shown to correctly reproduce the characteristic features of the coherent instability as obtained previously by conventional techniques based on the Vlasov equation for the beam distribution. The results further validate the TWM approach as a consistent alternative description for analyzing the dynamics of high energy charged particle beams.

  • 17.
    Anderson, D.
    et al.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Ericsson Telcom AB, Sweden.
    A variational approach to nonlinear evolution equations in optics2001Ingår i: Pramana (Bangalore), ISSN 0304-4289, E-ISSN 0973-7111, Vol. 57, nr 5-6, s. 917-936Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The use of direct variational methods based on Rayleigh-Ritz optimization for finding approximate solutions to various nonlinear evolution equations was presented. The main advantage of the approach is that it provides simple and explicit expressions for physically relevant quantities where exact analytical solutions are not available. It is found that the given method is flexible and can be applied to stationary and dynamical problems.

  • 18.
    Aurelius, Andreas
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Jacobsen, Gunnar
    RISE., Swedish ICT, Acreo.
    New Method for Measuring Probablility Density Function of Modulated Optical Signals, demonstrated on EDFA SOA2006Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 27, nr 3, s. 168-71Artikel i tidskrift (Refereegranskat)
  • 19.
    Carlsson, A.
    et al.
    RISE., Swedish ICT, Acreo.
    Jacobsen, G.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Receiver Model Including Square-Law Detection and ISI from Arbitrary Electrical Filtering2003Ingår i: Conference on Optical Fiber Communication, Technical Digest Series, 2003, s. 68-69Konferensbidrag (Refereegranskat)
    Abstract [en]

    A dynamic receiver model, which uses the electrical filter time response to include the effects of inter-symbol-interference (ISI) was described. The model consisted an arrayed waveguide grating (AWG), a photodiode (PD), an electrical low pass filter (LPF) and a decision circuit. The model used matrix formalism, which made it directly applicable to numerical simulations. An example, measurements and numerical results on 10Gbit/s simulations, that showed the influence of ISI from a 4th order Bessel filter on the Bit Error Ratio (BER) was also presented.

  • 20.
    Carlsson, A.
    et al.
    Ericsson Telecom, Sweden.
    Jacobsen, G.
    Ericsson Telecom, Sweden.
    Anders, Berntson
    Ericsson Telecom, Sweden.
    Rigorous modeling of noise and ISI in optical WDM receivers with arbitrary electrical filtering2002Ingår i: Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest, 2002, s. 532-533Konferensbidrag (Refereegranskat)
    Abstract [en]

    Rigorous modeling of noise and intersymbol signal interference in optical wavelength division multiplexing receivers with arbitrary electrical filtering was presented. Simulations of a WDM back-to-back system was performed with 32 signal channels. Bit-error-rate was evaluated as a function of received power at the input to the pre-amplifier. Results indicated that for a filter with a narrow bandwidth, the impulse response was spread out, and the detected bit was affected by the impulse response from previous bits.

  • 21.
    Cattani, F.
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Effect of self-phase modulation in chirped-pulse-amplification-like schemes1999Ingår i: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, E-ISSN 1520-8540, Vol. 16, nr 11, s. 1874-1879Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A detailed analytical investigation is made of the effect of nonlinear self-phase modulation in chirped-pulse-amplification-like schemes. It is demonstrated that self-phase modulation in the amplifier between the stretcher and the compressor breaks the dispersive sign symmetry of the configuration. This implies that, although self-phase modulation is usually considered a deleterious effect, different situations are possible, depending on the parameter regimes considered. In particular, the influence of self-phase modulation on the low-intensity wings of the compressed pulse may be more or less deleterious, depending on the dispersive sign combination of the stretcher and the compressor; in certain parameter regimes, it may in fact even enhance the pulse compression. 

  • 22.
    Dimitrevski, K.
    et al.
    Chalmers University of Technology, Sweden.
    Reimhult, E.
    Chalmers University of Technology, Sweden.
    Svensson, E.
    Chalmers University of Technology, Sweden.
    Öhgren, A.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Quiroga-Teixeiro, M. L.
    Chalmers University of Technology, Sweden.
    Analysis of stable self-trapping of laser beams in cubic-quintic nonlinear media1998Ingår i: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 248, nr 5-6, s. 369-376Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A numerical and analytical analysis of two-dimensional laser beam propagation in cubic-quintic nonlinear optical media demonstrates the existence of stable stationary radially symmetric modes. By means of a variational method, involving super-Gaussian trial functions and Ritz optimization, approximate stationary solutions are obtained, showing very good agreement with numerical results, even in the strongly non-linear, almost saturated, regime. The stability of the stationary modes are verified by analytical analysis and by direct numerical simulations. 

  • 23.
    Djupsjöbacka, Anders
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    A Method to Calculate PMD-Induced Eye-Opening Penalty Signal Outage for RZ-Modulated Signal Formats2008Ingår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 26, s. 3186-89Artikel i tidskrift (Refereegranskat)
  • 24.
    Djupsjöbacka, Anders
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Källgren, Dan
    TeliaSonera AB, Sweden.
    Measured Temporal statistics of the DGD RMS-Value in Buried Optical Fibers2009Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 21, nr 24, s. 1801-1803Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The behavior of the differential group delay (DGD)root-mean-square (rms) value is investigated for a buried G.652fiber line in a metropolitan fiber plant outside Stockholm, Sweden.This study presents measurement results from two different mea-surement periods where the same fiber and the same measurementequipment was used. In total,2800 hours of measurements wereperformed. As expected, the recorded DGD rms-value variedwith time. The measured standard deviation for the statistics ofthe DGD rms-value fits reasonably well with values presentedin literature. The fiber line, which showed a DGD rms-value of0.45 ps in average, had an extremely long time constant. Evenafter2800 hours of measurements we have not closed in on theexpected asymptotic distribution of the measured DGD rms-value

  • 25.
    Djupsjöbacka, Anders
    et al.
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Åstlund, L
    Proximion Fiber Systems AB, Sweden.
    Estimating Eye-opening Penalty with Aid of the Ripple Function of Fiber Bragg-gratings2007Ingår i: Journal of Optical Communications, Vol. 28, s. 91-95Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigate six different methods presented in litera-ture to estimate eye-opening penalty for dispersion-com-pensating fiber Bragg gratings with aid of the grating’s ripple function. The investigation is based on theoretical ripple functions as well on measurement results of three continuously chirped gratings. The gratings in question offer full wavelength coverage between 1530 nm and 1565 nm. We will show that the eye-opening penalty de-pends on the phase and frequency of the grating’s ripple function as well as to pattern length and to pulse form of the signal used. Since the estimation methods do not ac-count for these properties, their accuracy is shown to be limited.

  • 26.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Ifwm suppression by asynchronous phase modulation2006Ingår i: 2006 European Conference on Optical Communications Proceedings, ECOC 2006, 2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    We propose a cost-effective way to increase the non-linear tolerance of all channels in a 40-Gb/s WDM transmission system, which is shown to greatly improve the performance of RZ and especially NRZ transmission.

  • 27.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Davies, R. J.
    TRLabs,, Norway.
    Performance analysis of single-MZM APRZ transmitter2005Ingår i: IET Conference Publications, Institution of Engineering and Technology , 2005, nr CP502, s. 663-664Konferensbidrag (Refereegranskat)
    Abstract [en]

    We present the first numerical study of 67%-duty-cycle single-MZM APRZ, comparing it with 33% RZ, 33% APRZ and standard CSRZ. This transmitter is shown to combine CSRZ implementation simplicity with the improved nonlinear tolerance of π/2-APRZ.

  • 28.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    IFWM suppression in NRZ transmission experiment at 40 Gb/s using asynchronous phase modulation2007Ingår i: Optics InfoBase Conference Papers, Optical Society of America , 2007Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Asynchronous Phase Modulation (APM) scheme is experimentally studied for the first time. APM is shown to increase the power tolerance of NRZ-OOK over a 3x75-km link. © 2006 Optical Society of America.

  • 29. Forzati, Marco
    et al.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Pincemin, E.
    RISE., Swedish ICT, Acreo.
    Gavignet, P.
    RISE., Swedish ICT, Acreo.
    NRZ-OOK transmission of 16×40 Gb/s over 2800 km SSMF using asynchronous phase modulation2008Ingår i: 2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS, 2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    We use the cost-effective APM technique to increase the non-linear tolerance of NRZ-OOK, and we demonstrate, in a recirculating loop experiment, the transmission over 2800 km SSMF of 16 NRZ-OOK 40 Gb/s channels with 100 GHz spacing.

  • 30.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Pincemin, E.
    RISE., Swedish ICT, Acreo.
    Gavignet, P.
    RISE., Swedish ICT, Acreo.
    NRZ-OOK transmission of 16£40 Gb/s Over 2800 km SSMF using asynchronous phase modulation2008Ingår i: Optics InfoBase Conference Papers, Optical Society of America , 2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    We use the cost-e®ective APM technique to increase the non-linear tolerance of NRZ-OOK, and we demonstrate, in a recirculating loop experiment, the transmission over 2800 km SSMF of 16 NRZ-OOK 40 Gb/s channels with 100 GHz spacing. © 2007 Optical Society of America.

  • 31.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    IFWM Suppression Using APRZ with Optimized Phase-Modulation Parameters2004Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 16, s. 2368-70Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We demonstrate experimentally as well as numerically that the alternate-phase return-to-zero modulation format increases the nonlinear tolerance of strongly dispersion-managed 40-Gb/s transmission. An analysis of phase misalignment is also presented.

  • 32.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo, Broadband Technology.
    Anders, Berntson
    RISE., Swedish ICT, Acreo, Broadband Technology.
    Mårtensson, Jonas
    RISE., Swedish ICT, Viktoria.
    Polarisation Modulation Scheme for intra-channel non-linear suppression2007Patent (Övrig (populärvetenskap, debatt, mm))
  • 33.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Davies, R. J.
    Performance Analysis of Single-MZM APRZ Transmitters2006Ingår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 24, s. 2006-14Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, an efficient single Mach-Zender modulator (MZM) implementation of alternate-phase return to zero (APRZ), which combines carrier-suppressed return to zero (CSRZ)'s ease of implementation with APRZ's nonlinear tolerance, is analyzed. In particular, the first numerical study of 67%-duty-cycle single-MZM APRZ over a 40-Gb/s 5 × 100-km link, in terms of nonlinear, dispersion, and filtering tolerance, comparing it with 33% RZ, 33% APRZ, and standard 67% CSRZ, is presented. The results show that APRZ with phase shift close to π/2 is the optimum choice, independent of specific transmitter implementation. A new mechanism is also discovered, based on the interference of ghost pulses with the original pulse train, which improves the nonlinear tolerance of CSRZ in a 40-Gb/s transmission

  • 34.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Asynchronous Phase Modulation for the Suppression of IFWM2007Ingår i: IEEE transactions on intelligent transportation systems (Print), ISSN 1524-9050, E-ISSN 1558-0016, Vol. 25, s. 2969-75Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Intrachannel four-wave mixing (IFWM) represents main source of impairments in fiber transmission at 40 Gb/s. A number of phase modulation techniques have been proposed to suppress the IFWM. In this paper, we study a cost-effective way of increasing the nonlinear tolerance of a 40-Gb/s wavelength division multiplexing transmission system by asynchronous phase modulation (APM). This can be achieved with one phase modulator placed after the wavelength multiplexer so that cost is shared by all channels. We show, by means of numerical simulations and laboratory experiments, that APM greatly improves the performance of ON-OFF-keying transmission.

  • 35.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Li, J.
    RISE., Swedish ICT, Acreo.
    Melin, S.
    40 Gbit/s field experiment over 820 km transmission link designed for 10 Gbit/s using APRZ modulation format2006Ingår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 42, s. 991-92Artikel i tidskrift (Refereegranskat)
  • 36.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Djupsjöbacka, Anders
    RISE., Swedish ICT, Acreo.
    Li, J.
    RISE., Swedish ICT, Acreo.
    Melin, S.
    TeliaSonera AB, Sweden.
    Carlden, H.
    TeliaSonera AB, Sweden.
    40-gb/s field transmission through 540 km ssmf using the aprz modulation format2005Ingår i: Optics InfoBase Conference Papers, Optical Society of America , 2005Konferensbidrag (Refereegranskat)
    Abstract [en]

    We report the first field transmission experiment using the APRZ modulation format for 40-Gb/s transmission through 540 km SSMF, which confirms the improved nonlinear tolerance of APRZ. The optimum phase-modulation amplitude in this experiment is p/2. 

  • 37.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Pincemin, Erwan
    France Télécom, France.
    Gavignet, Paulette
    France Télécom, France.
    Transmission of 16x40 Gb/s NRZ-OOK Channels Over 2800 km SSMF Using Asynchronous Phase Modulation2009Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 21, s. 131-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We use the cost-effective APM technique to increase the non-linear tolerance of NRZOOK, and we demonstrate, in a recirculating loop experiment, the transmission over 2800 km SSMF of 16 NRZ-OOK 40 Gb/s channels with 100 GHz spacing.

  • 38.
    Forzati, Marco
    et al.
    RISE., Swedish ICT, Acreo.
    Iyer, S.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Mårtensson, Jonas
    RISE., Swedish ICT, Acreo.
    Experimental study of single-MZM APRZ transmitters for fibre-optic communications2008Ingår i: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 44, s. 148-49Artikel i tidskrift (Refereegranskat)
  • 39.
    Forzati, Marco
    et al.
    Ericsson Telecom AB, Sweden.
    Mårtensson, Jonas
    Ericsson Telecom AB, Sweden.
    Anders, Berntson
    Ericsson Telecom AB, Sweden.
    Djupsjöbacka, Anders
    Ericsson Telecom AB, Sweden.
    Johannisson, Pontus
    RISE., Swedish ICT, Acreo. Chalmers University of Technology, Sweden.
    Reduction of intra-channel four-wave mixing using the alternate-phase RZ modulation format2002Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 14, nr 9Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    —The authors propose a modulation format in which the phase of the signal pulses alternates, in order to reduce the intrachannel four-wave mixing. They demonstrate numerically that the performance of a 40-Gb/s transmission link can be substantially improved.

  • 40.
    Hall, B.
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Boyer, G.
    Ecole Polytechnique, France.
    Karlsson, M.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Ericsson Telecom AB, Sweden.
    Pump-probe collision in optical fibers: Four-wave-mixing induced frequency jump2001Ingår i: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, E-ISSN 1520-8540, Vol. 18, nr 11, s. 1652-1658Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An investigation is made of ultrafast pump-probe pulse collisions near the zero-dispersion wavelength in an optical single-mode fiber. A steplike probe frequency shift is observed when the pump power is gradually increased. The magnitude of this frequency jump is shown to depend on the phase difference between the pulses. This new effect is investigated numerically and experimentally and is attributed to four-wave mixing.

  • 41.
    Helczynski, L.
    et al.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Ericsson Telecom, Sweden.
    Comparison of EDFA and bidirectionally pumped raman amplifier in a 40-Gb/s RZ transmission system2001Ingår i: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 13, nr 7, s. 669-671Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We numerically compare the performance of a bidirectionally pumped Raman- and an erbium-doped fiber amplifier (EDFA) system in a 40-Gb/s dispersion-managed return-to-zero (RZ) transmission. The Raman amplifier system shows a substantially higher Q-value compared to that of the EDFA.

  • 42.
    Helczynski, L.
    et al.
    Chalmers University of Technology, Sweden.
    Hall, B.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Lisak, M.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Ericsson Telecom AB, Sweden.
    Desaix, M.
    Cross Phase Modulation Induced Pulse Splitting - The Optical Axe2000Ingår i: Physica scripta. T, ISSN 0281-1847, Vol. 84, s. 81-84Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An analytical as well as numerical analysis is made of the dynamics induced on a weak signal wave pulse by a co-propagating strong pump wave pulse in a nonlinear Kerr medium. Emphasis is given to the situation where the group velocity dispersion and the non-linearity of the signal pulse have opposite signs. In this defocusing situation, it is demonstrated that the pump splits the signal pulse into two frequency shifted pulse fragments which separate in time, asymptotically with constant separation velocity. Explicit analytical predictions for the velocity of separation are obtained and corroborated by numerical simulations.

  • 43.
    Jacobsen, Gunnar
    et al.
    RISE., Swedish ICT, Acreo.
    Aurelius, A
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    BER Model for Rx ISI Effects in WDM Systems Accounting for General LPF Impulse Responses for Correlation of Quadrature Polarization Noise Contributions2007Ingår i: Journal of Optical Communications, Vol. 28, nr 1, s. 52-57Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In [1] a rigorous model for Rx ISI effects caused by optical and electrical filtering in the receiver was presented aiming at 10-40 Gbit/s WDM system design applications. The model is applicable for general types of optical and electrical filtering. The model assumes Gaussian distributed noise contributions in the optical domain for in-phase and quadrature noise components in orthogonal polarization states and that these noise contributions are un-correlated. The optical filter is specified via the correlation function and the electrical filter via the impulse response. A limitation of the model was that only positive impulse responses could be accounted for when the noise properties of the receiver is specified. We present here an extension of the model in [1] to account in rigorous form also for negative impulse responses when determining the noise properties of the receiver. As a major theoretical result the formulation is extended to account for correlation between quadrature noise contributions - as it may e.g. be caused by four wave mixing effects in the transmission fiber - and noise contributions in orthogonal polarizations states - that may be due to saturation effects in cascaded optical amplifiers in the transmission path. The formulation leads to a Hermitian form of the covariance matrix. It is however to be noted that the covariance matrix in the situation with positive impulse response is positive definite (with positive eigenvalues) whereas in the general situation it is not positive definite and may have positive as well as negative eigenvalues. However, the Hermitian form allows in all cases a straightforward analytical formulation of the moment generating function (MGF) which in turn specifies the BER. The model is included in the simulation tool VPI-transmissionMaker™WDM and numerical examples for a 10 Gbit/s pre-amplified Rx shows that the influence of a negative impulse response may be (up to) several orders of magnitude in the BER.

  • 44.
    Jacobsen, Gunnar
    et al.
    RISE., Swedish ICT, Acreo. Ericsson AB, Sweden.
    Carlsson, A
    RISE., Swedish ICT, Acreo. Ericsson AB, Sweden.
    Anders, Berntson
    RISE., Swedish ICT, Acreo. Ericsson AB, Sweden.
    New rigorous model for Rx ISI effects in WDM systems2004Ingår i: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 25, nr 6, s. 241-45Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present a model for Rx ISI effects using a new and completely general and rigorous dynamic Rx model for-mulation aiming at 10–40 Gbit/s WDM system design applications. The signal shaping part of an electrical fil-ter is modelled in the optical domain using the filter impulse response to modify the signal vector and the covariance matrix. In this way inter-symbol-interference (ISI) effects from any type of electrical filter – specified by the filter impulse response – can be described. The formulation leads to a Hermitian form of the covariance matrix, thus allowing a straightforward analytical formu-lation of the moment generating function (MGF) which in turn specifies the bit-error-ratio (BER). Numerical ex-amples for a 10 Gbit/s pre-amplified Rx shows that the ISI leads to (up to) several dBʼs degradation in sensitivity. Thus it is imperative to account for the Rx ISI effect in rigorous and accurate form in any general WDM trans-mission model.

  • 45.
    Johannisson, P.
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Ericsson Telecom AB, Sweden.
    Mårtensson, J.
    Ericsson Telecom AB, Sweden.
    Generation and dynamics of ghost pulses in strongly dispersion-managed fiber-optic communication systems2001Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 26, nr 16, s. 1227-1229Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigate the nonlinear generation and dynamics of ghost pulses in high-speed strongly dispersion-managed fiber-optic communication systems. Particular consideration is given to the importance of system parameters for the properties of the emerging ghost pulses. Conclusions are drawn about the growth rate and the temporal position of the ghost pulses in different systems. 

  • 46.
    Johannisson, Pontus
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D.
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Ericsson Telecom AB, Sweden.
    Mårtensson, Jonas
    Ericsson Telecom AB, Sweden.
    Generation dynamics of ghost pulses in strongly dispersion-managed fiber-optic communication systems2001Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 26, s. 1227-29Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We investigate the nonlinear generation and dynamics of ghost pulses in high-speed strongly dispersion-managed fiber-optic communication systems. Particular consideration is given to the importance of system parameters for the properties of the emerging ghost pulses. Conclusions are drawn about the growth rate and the temporal position of the ghost pulses in different systems.

  • 47.
    Johannisson, Pontus
    et al.
    Chalmers University of Technology, Sweden.
    Anderson, D
    Chalmers University of Technology, Sweden.
    Marklund, Magnus
    Chalmers University of Technology, Sweden.
    Anders, Berntson
    Ericsson Telecom AB, Sweden.
    Forzati, Marco
    Ericsson Telecom AB, Sweden.
    Mårtensson, Jonas
    Ericsson Telecom AB, Sweden.
    Suppression of nonlinear effects by phase alternation in strongly dispersion-managed optical transmission2002Ingår i: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 27, nr 12Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The nonlinear effects of amplitude jitter and ghost pulse generation, which are present in strongly dispersion-managed optical communication systems can be suppressed by alternation of the phase of the bits. A physical explanation for this effect is given that shows that with suitably chosen phase modulations the processes that give rise to the nonlinear effects will counteract each other.

  • 48.
    Larsen, C. P.
    et al.
    RISE., Swedish ICT, Acreo.
    Andersson, L.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Gavler, A.
    RISE., Swedish ICT, Acreo.
    Kauppinen, T.
    RISE., Swedish ICT, Acreo.
    Lindqvist, C.
    RISE., Swedish ICT, Acreo.
    Madsen, T.
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Experiences from the acreo national broadband testbed2006Ingår i: Optics InfoBase Conference Papers, Optical Society of America , 2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    We describe the Acreo National Broadband Testbed in Sweden. The testbed is a multitechnology end-to-end access network with more than 200 users testing real services. Technical design, experiences and visions from the testbed are presented. © 2003 Optical Society of America.

  • 49.
    Larsen, C. P.
    et al.
    RISE., Swedish ICT, Acreo.
    Andersson, L.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Gavler, A.
    RISE., Swedish ICT, Acreo.
    Kauppinen, T.
    RISE., Swedish ICT, Acreo.
    Lindqvist, C.
    RISE., Swedish ICT, Acreo.
    Mådsen, T.
    RISE., Swedish ICT, Acreo.
    Mårtensson, J.
    RISE., Swedish ICT, Acreo.
    Experiences from the acreo national broadband testbed2006Ingår i: 2006 Optical Fiber Communication Conference, and the 2006 National Fiber Optic Engineers Conference, 2006Konferensbidrag (Refereegranskat)
    Abstract [en]

    We describe the Acreo National Broadband Testbed in Sweden. The testbed is a multi-technology end-to-end access network with more than 200 users testing real services. Technical design, experiences and visions from the testbed are presented. © 2003 Optical Society of America.

  • 50.
    Li, J.
    et al.
    RISE., Swedish ICT, Acreo.
    Anders, Berntson
    RISE., Swedish ICT, Acreo.
    Subpicosecond 40 GHz pulse generation using simultaneous two-arm modulation of a Mach-Zehnder intensity modulator2008Ingår i: European Conference on Optical Communication, ECOC, 2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    0.6 ps long-term stable, high extinction-ratio optical pulse generation at 40 GHz has been demonstrated based on simultaneous two-arm modulation of a LN Mach-Zehnder modulator. 

12 1 - 50 av 79
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