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Publications (10 of 11) Show all publications
Fougstedt, C., Sheikh, A., Johannisson, P. & Larsson-Edefors, P. (2018). Filter Implementation for Power-Efficient Chromatic Dispersion Compensation. IEEE Photonics Journal, 10(4), Article ID 7202919.
Open this publication in new window or tab >>Filter Implementation for Power-Efficient Chromatic Dispersion Compensation
2018 (English)In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655, Vol. 10, no 4, article id 7202919Article in journal (Refereed) Published
Abstract [en]

Chromatic dispersion (CD) compensation in coherent fiber-optic systems represents a very significant DSP block in terms of power dissipation. Since spectrally efficient coherent systems are expected to find a wider deployment in systems shorter than long haul, it becomes relevant to investigate filter implementation aspects of CD compensation in the context of systems with low-to-moderate amounts of accumulated dispersion. The investigation we perform in this paper has an emphasis on implementation aspects such as power dissipation and area usage, it deals with both time-domain and frequency-domain CD compensations, and it considers both A/D-conversion quantization and fixed-point filter design aspects. To enable an accurate analysis on power dissipation and chip area, the evaluated filters are implemented in a 28-nm fully depleted silicon-on-insulator (FD-SOI) process technology. We show that an optimization of the filter response that takes pulse shaping into account can significantly reduce power dissipation and area usage of time-domain implementations, making them a viable alternative to frequency-domain implementations.

Keywords
digital signal processing chips, frequency-domain analysis, optical fibre communication, silicon-on-insulator, time-domain analysis, DSP block, frequency-domain implementations, time-domain implementations, filter response, fixed-point filter design aspects, frequency-domain CD compensations, low-to-moderate amounts, CD compensation, spectrally efficient coherent systems, power dissipation, coherent fiber-optic systems, power-efficient chromatic dispersion compensation, filter implementation, Finite impulse response filters, Optimization, Design methodology, Chromatic dispersion, Throughput, Optical fiber communication, digital signal processing, application specific integrated circuits
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34351 (URN)10.1109/JPHOT.2018.2846799 (DOI)2-s2.0-85048524365 (Scopus ID)
Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2019-06-27Bibliographically approved
Johannisson, P., Ohlsson, F. & Rusu, C. (2018). Impact-driven up-conversion in piezoelectric MEMS energy harvesters with pulsed excitation. In: Journal of Physics: Conference Series. Paper presented at 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017. (1), Article ID 012106.
Open this publication in new window or tab >>Impact-driven up-conversion in piezoelectric MEMS energy harvesters with pulsed excitation
2018 (English)In: Journal of Physics: Conference Series, 2018, no 1, article id 012106Conference paper, Published paper (Refereed)
Abstract [en]

The potential of impact-driven frequency up-conversion in a MEMS EH is evaluated using numerical simulations. The investigated design is compared to a conventional cantilever EH in terms of output power and loss rate. The upshifting can lead to significantly increased output power at a similar loss rate but as the time scale for the loss is long, the benefit is limited. This also requires an effective upshifting process. The design of the impact introduces a length scale that must be selected with excitation, gravity, and pre-stress taken into account. This makes this type of EH application-dependent as a non-optimal choice may result in low output power.

Keywords
Frequency converters, Nanotechnology, Energy Harvester, Frequency up conversion, Length scale, Optimal choice, Output power, Piezoelectric MEMS, Pulsed excitation, Up conversion, Energy conversion
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34960 (URN)10.1088/1742-6596/1052/1/012106 (DOI)2-s2.0-85051348585 (Scopus ID)
Conference
17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017
Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2019-06-27Bibliographically approved
Irukulapati, M., Secondini, M., Agrell, E., Johannisson, P. & Wymeersch, H. (2018). Improved Lower Bounds on Mutual Information Accounting for Nonlinear Signal--Noise Interaction. Journal of Lightwave Technology, 36(22), 5152-5159
Open this publication in new window or tab >>Improved Lower Bounds on Mutual Information Accounting for Nonlinear Signal--Noise Interaction
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2018 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 36, no 22, p. 5152-5159Article in journal (Refereed) Published
Abstract [en]

In fiber-optic communications, evaluation of mutual information (MI) is still an open issue due to the unavailability of an exact and mathematically tractable channel model. Traditionally, lower bounds on MI are computed by approximating the (original) channel with an auxiliary forward channel. In this paper, lower bounds are computed using an auxiliary backward channel, which has not been previously considered in the context of fiber-optic communications. Distributions obtained through two variations of the stochastic digital backpropagation (SDBP) algorithm are used as auxiliary backward channels and these bounds are compared with bounds obtained through the conventional digital backpropagation (DBP). Through simulations, higher information rates were achieved with SDBP, which can be explained by the ability of SDBP to account for nonlinear signal--noise interactions

Keywords
Achievable information rate, auxiliary channel, fiber-optical communications, mismatched decoding, nonlinear compensation, stochastic digital backpropagation, Backpropagation algorithms, Fiber optics, Nonlinear optics, Signal noise measurement, Stochastic systems, Digital backpropagation, Fiber optical communications, Non-linear compensations, Optical fiber communication
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35200 (URN)10.1109/JLT.2018.2869109 (DOI)2-s2.0-85052855904 (Scopus ID)
Available from: 2018-10-10 Created: 2018-10-10 Last updated: 2019-06-27Bibliographically approved
Ohlsson, F., Johannisson, P. & Rusu, C. (2018). Shape effects in doubly clamped bridge structures at large deflections. In: Journal of Physics: Conference Series. Paper presented at 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017. , 1052(1)
Open this publication in new window or tab >>Shape effects in doubly clamped bridge structures at large deflections
2018 (English)In: Journal of Physics: Conference Series, 2018, Vol. 1052, no 1Conference paper, Published paper (Refereed)
Abstract [en]

The shape of a doubly clamped bridge structure depends on its deflection. At large deflections, where the system exhibits nonlinear behaviour, the shape effect becomes significant. We present a general method, based on variational analysis, for computing corrections to the nominal linear regime shape function. The method is used to compute the first non-trivial correction and quantify the corresponding improvement in the large deflection regime. The model obtained is also validated using FEM simulations.

Keywords
Energy conversion, Nanotechnology, Bridge structures, FEM simulations, General method, Large deflection, Linear regime, Nonlinear behaviours, Shape functions, Variational analysis, Deflection (structures)
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34959 (URN)10.1088/1742-6596/1052/1/012109 (DOI)2-s2.0-85051341507 (Scopus ID)
Conference
17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017
Available from: 2018-08-27 Created: 2018-08-27 Last updated: 2019-06-27Bibliographically approved
Larsson, S., Johannisson, P., Kolev, D., Ohlsson, F., Nik, S., Liljeholm, J., . . . Rusu, C. (2018). Simple method for quality factor estimation in resonating MEMS structures. In: Proceedings of the 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, 2017: . Paper presented at 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017. (1)
Open this publication in new window or tab >>Simple method for quality factor estimation in resonating MEMS structures
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2018 (English)In: Proceedings of the 17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, 2017, 2018, no 1Conference paper, Published paper (Refereed)
Abstract [en]

The quality factor of a packaged MEMS resonating structure depends on both the packaging pressure and the structure's proximity to the walls. This type of mechanical constraints, which causes energy dissipation from the structure to the surrounding air, are applicable for oscillating energy harvesters and should be considered in the design process. However, the modelling of energy losses or the measurements of their direct influence inside a packaged chip is not trivial. In this paper, a simple experimental method to quantify the energy loss in an oscillating MEMS structures due to the surrounding air is described together with preliminary results. The main advantage of the method is the ability to characterize the damping contributions under different vacuum and packaging conditions without requiring any packaging of the harvester chip or fabrication of multiple devices with different cavity depths. © Published under licence by IOP Publishing Ltd.

Keywords
Energy conversion, Energy dissipation, Nanotechnology, Damping contribution, Energy Harvester, Experimental methods, Mechanical constraints, Multiple devices, Quality factor estimation, Quality factors, Resonating structures, Chip scale packages
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34961 (URN)10.1088/1742-6596/1052/1/012100 (DOI)2-s2.0-85051331110 (Scopus ID)
Conference
17th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications, PowerMEMS 2017, 14 November 2017 through 17 November 2017
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2019-06-27Bibliographically approved
Czegledi, C. B., Karlsson, M., Johannisson, P. & Agrell, E. (2017). Temporal stochastic channel model for absolute polarization state and polarization-mode dispersion. In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings: . Paper presented at 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017. Los Angeles, USA.
Open this publication in new window or tab >>Temporal stochastic channel model for absolute polarization state and polarization-mode dispersion
2017 (English)In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, 2017Conference paper, Published paper (Refereed)
Abstract [en]

We propose and validate a discrete-time channel model for the temporal drift of the absolute polarization state and polarization-mode dispersion for coherent fiber optic systems. The model can be used in simulations to test and develop DSP for coherent receivers.

Keywords
Optical fiber communication, Optical fibers, Polarization, Stochastic systems, Coherent receivers, Discrete-time channels, Fiber optic system, Polarization state, Stochastic channel model, Temporal drifts, Stochastic models
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-30910 (URN)10.1364/OFC.2017.Th3F.2 (DOI)2-s2.0-85025807946 (Scopus ID)9781943580231 (ISBN)
Conference
2017 Optical Fiber Communications Conference and Exhibition, OFC 2017, 19 March 2017 through 23 March 2017. Los Angeles, USA
Available from: 2017-09-07 Created: 2017-09-07 Last updated: 2019-06-27Bibliographically approved
Johannisson, P., Ohlsson, F. & Rusu, C. (2016). Multi-axis piezoelectric energy harvesting using MEMS components with slanted beams. Paper presented at 16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2016), December 6-9, 2016, Paris, France. Journal of Physics, Conference Series, 773(1), Article ID 012080.
Open this publication in new window or tab >>Multi-axis piezoelectric energy harvesting using MEMS components with slanted beams
2016 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 773, no 1, article id 012080Article in journal (Refereed) Published
Abstract [en]

During the manufacturing of MEMS components, slanted beams can be produced in the etching process. We show that this can be used to produce skew motion that causes deflection of a proof mass out of the device plane also when the excitation is confined to the device plane. This allows construction of an energy harvester that uses a planar manufacturing process and produces power also with in-plane excitation. To obtain this with traditional methods it would be necessary to manufacture separate components and then mount them with their sensitive axes orthogonal to each other.

Keywords
Energy conversion, Manufacture, Nanotechnology, Energy Harvester, Etching process, Manufacturing process, Multi-Axis, Piezoelectric energy harvesting, Proof mass, Slanted beams, Energy harvesting
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32557 (URN)10.1088/1742-6596/773/1/012080 (DOI)2-s2.0-85009820189 (Scopus ID)
Conference
16th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS 2016), December 6-9, 2016, Paris, France
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2019-06-27Bibliographically approved
Forzati, M., Mårtensson, J., Berntson, A., Djupsjöbacka, A. & Johannisson, P. (2002). Reduction of intra-channel four-wave mixing using the alternate-phase RZ modulation format (ed.). IEEE Photonics Technology Letters, 14(9)
Open this publication in new window or tab >>Reduction of intra-channel four-wave mixing using the alternate-phase RZ modulation format
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2002 (English)In: IEEE Photonics Technology Letters, ISSN 1041-1135, E-ISSN 1941-0174, Vol. 14, no 9Article in journal (Refereed) Published
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32254 (URN)
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2019-06-27Bibliographically approved
Johannisson, P., Anderson, D., Marklund, M., Berntson, A., Forzati, M. & Mårtensson, J. (2002). Suppression of nonlinear effects by phase alternation in strongly dispersion-managed optical transmission (ed.). Optics Letters, 27(12)
Open this publication in new window or tab >>Suppression of nonlinear effects by phase alternation in strongly dispersion-managed optical transmission
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2002 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 27, no 12Article in journal (Refereed) Published
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32251 (URN)
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2019-06-27Bibliographically approved
Johannisson, P., Anderson, D., Berntson, A. & Mårtensson, J. (2001). Generation dynamics of ghost pulses in strongly dispersion-managed fiber-optic communication systems (ed.). Optics Letters, 26, 1227-29
Open this publication in new window or tab >>Generation dynamics of ghost pulses in strongly dispersion-managed fiber-optic communication systems
2001 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 26, p. 1227-29Article in journal (Refereed) Published
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32286 (URN)
Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2019-06-27Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-1793-4451

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