Abstract

Compensation of nonlinear distortion in long distance communication links from the power induced Kerr effect is demonstrated by inserting at the transmitter or receiver a module combining optical phase conjugation (OPC) and propagation in a stepwise parameter profiled fiber (SPF). The SPF tailored with an increasing nonlinearity and decreasing dispersion parameter on average with distance as well as Raman gain induces a distortion more closely matching that of the link to improve propagation symmetry for enhancing overall distortion cancellation by OPC. Measurements show inserting the module at the transmitter or receiver with a 60 km long SPF comprising of three different fibers enables increasing the Q²-factor by 2.3 and 1.7 dB, respectively, compared to without for transmitting 5 channel WDM dual polarization 12 Gbaud 16-QAM signals in 2 × 160 km fiber spans that include dispersion compensation. Similarly, recirculating loop transmission of the same signal over 18 × 80 km (1440 km) shows improved Q²-factors of 1.9 and 1.3 dB, respectively. This corresponds to extending the transmission reach by 125 and 80%, respectively, for matched performance at equal launch power, highlighting the greater nonlinear distortion tolerance achievable with advanced OPC designs.

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