Coherent All-Optical Phase and Amplitude Regenerator of Binary Phase-Encoded Signals

All-Optical Regeneration of Phase Encoded Signals

“…For all levels of phase-only (Figure 13a), ASE-only ( Figure 13b) and combined noise (Figure 13c), we see that there is some error flooring for the signal both with and without the regenerator. By comparing Figure 13a and Figure 13b it can be seen that the regenerator copes better with 'non-linear' (phaseonly) phase noise than with 'linear' noise (ASE), which is in line with the theoretical predictions discussed in [57]. The reader is referred to [57] for an in-depth discussion of link performance with such a regenerator inline.…”

“…In the saturation regime, the high input signal power gives rise to the generation of multiple FWM products which inherit the amplitude and phase properties of the initially interacting waves (Pump 1, Pump 2, and Data). Theoretical and experimental analysis showing that the generated signal copies are also regenerated is presented in [57]. This feature was used for performing simultaneous regeneration and wavelength conversion in a field trial experiment as described later.…”

All-Optical Processing of Multi-level Phase Shift Keyed Signals

“…This is because the differential phase error distribution rapidly approaches the absolute error distribution after the quantizer, a phenomenon previously observed with a DPSK regenerator based on a degenerate FWM [8]. Numerical simulations (split step Fourier method) are used here to illustrate this effect.…”

Wavelength conversion of complex modulation formats in a compact SiGe waveguide

“…However, the transmission and processing of QAM signals present a significant challenge. QAM signals are susceptible to both linear and nonlinear phase noise, and require high optical signal to noise ratios (OSNRs) in reception [6,7]. Therefore, the performance requirements on processing systems (such as wavelength converters (WCs) and phase conjugators) designed for such signals are much more stringent than in simpler modulation formats.…”