Nonlinear polarization rotation (NPR) in semiconductor optical amplifiers (SOAs) is initially investigated. The changes of ellipticity angle of the probe light in a counter-propagation scheme are presented on the Poincaré sphere, and agree with the numerical simulations. All-optical wavelength conversions based on NPR in SOAs are realized at a bit rate of 2.5Gbit/s.
Birefringence in an InGaAsP/InP tensile-strained bulk semiconductor optical amplifier (SOA) is demonstrated by a polarization resolved amplified spontaneous emission (ASE) spectrum. A mode sum/min approach is used to investigate the periodicities in the ripple for transverse electric (TE) and transverse magnetic (TM) polarizations. The signal-induced birefringence in the SOA, which leads to polarization rotation of a probe beam, is presented in the format of the Poincare sphere. All-optical wavelength conversion (inverted and non-inverted) based on cross polarization modulation (XPolM) is realized. The impact of cross gain modulation (XGM) in XPolM is initially studied.
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