Abstract
We numerically optimise in-span signal power asymmetry in different advanced Raman amplification schemes, achieving a 3% asymmetry over 62 km SMF using random DFB Raman laser amplifier. We then evaluate the impact of such asymmetry on the performance of systems using mid-link OPC by simulating transmission of 7 × 15 Gbaud 16QAM Nyquist-spaced WDM-PDM signals.
Highlights
The nonlinear-Shannon limit sets a cap to maximum capacity in single mode optical fibres [1].To combat fibre nonlinear effects, using mid-link [2] or transmitter-based [3] optical phase conjugation (OPC) enables real time compensation of all deterministic nonlinear impairments
The degree of nonlinear compensation using mid-link OPC is related to the asymmetry match of the conjugated and transmitted signal power evolution in the fibre
We demonstrate, using proven numerical models, that almost ideally symmetrical signal power evolution can be achieved in advanced distributed amplification schemes, with the best results obtained for half- open-cavity random distributed feedback (DFB) Raman laser amplifier with bidirectional 2nd order pumping [5,6,7]
Summary
The nonlinear-Shannon limit sets a cap to maximum capacity in single mode optical fibres [1].To combat fibre nonlinear effects, using mid-link [2] or transmitter-based [3] optical phase conjugation (OPC) enables real time compensation of all deterministic (signal×signal) nonlinear impairments. Raman Fiber Laser Based Amplification Influenced by Second Order Co-pumping” in Asia Communications and Photonics Conference, OSA Technical Digest (online) (Optical Society of America, 2014), paper ATh1E.4.
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