Abstract
Using analytic and numerical modelling of fibre transmission systems that employ optical phase conjugation (OPC), we show inter-channel cross-phase modulation depends on the integrated square error between nonlinear profiles before and after OPC and that arranging amplifiers and tuning power levels is crucial to minimizing noise. We derive modulation transparent formulas for phase noise and optimal power settings. Examples are shown for 16 and 64 quadrature amplitude modulation.
Highlights
Optical phase conjugation (OPC) is a means to optically reverse detrimental dispersive [1, 2] and nonlinear [3,4,5] effects in fibre optic communications, thereby enabling an increase in network information capacity [6]
The mid-span OPC element typically involves a four-wave mixing (FWM) process between a communications signal and a strong frequency offset pump in a nonlinear element [2, 7], which reproduces a phase-conjugated copy of each channel at a frequency that is spectrally inverted about the pump
We show that XPM noise is directly proportional to the integrated square error in the asymmetric nonlinear profile
Summary
Optical phase conjugation (OPC) is a means to optically reverse detrimental dispersive [1, 2] and nonlinear [3,4,5] effects in fibre optic communications, thereby enabling an increase in network information capacity [6]. Neither, the exact parameter scaling laws nor the graphical optimization tools provide much analytic investigation of OPC set-ups with non-ideal fibre parameter scaling laws and their effect on nonlinear phase noise. In a simplified analytic model of the channel propagation [21,22,23] which is not perturbative in nonlinearity, we employ statistical analysis to derive the XPM noise variance. We believe that our analysis is the first analytic investigation to explicitly examine inter-channel XPM effects in OPC signal quality improvements have been shown in numerical simulations [24].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
