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.
A 40 Gbit/s transmission experiment on an installed link designed for dense wavelength division multiplexing (DWDM) transmission at 10 Gbit/s, using the alternate-phase return-to-zero (APRZ) modulation format is presented. The experiment confirms the superior nonlinear tolerance of APRZ, even with typical DWDM filtering.
It is shown that for very strong dispersion management, the energy enhancement depends not only on the dispersion map strength, but also on the ratio between the dispersion difference and the average dispersion. In WDM systems operating near zero average dispersion, this dependence can be exploited to almost equalise the energy per channel.
High-temperature operating performance of p-i-p quantum dots-in-a-well infrared photodetectors (QDIPs) is successfully demonstrated. The optically active region consists of 10 layers of p-doped self-assembled InAs quantum dots (QDs) asymmetrically positioned in In 0.15 Ga 0.85 As quantum wells (QWs). The dark current is suppressed by an incorporated superlattice (SL) structure composed of 10 pairs of AlGaAs/GaAs heterostructure. The very low recorded dark current makes the fabricated p-i-p QDIPs suitable for high-temperature operation. The measured photoresponse reveals broad mid-wave infrared (MWIR) detection up to 200 K.