Polarisation-independent phase conjugation of lightwave signals
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The authors propose and demonstrate a technique for phase conjugation of lightwave signals with an efficiency that is independent of the signal polarisation. Using either optical fibre or a semiconductor optical amplifier as the nonlinear element, a signal-polarisation dependence of about ±1 dB in the conjugation efficiency was obtained
[1] Yaochun Shen. Principles of nonlinear optics , 1984 .