J. Leuthold et al., POLARIZATION-INDEPENDENT OPTICAL-PHASE CONJUGATION WITH PUMP-SIGNAL FILTERING IN A MONOLITHICALLY INTEGRATED MACH-ZEHNDER INTERFEROMETER SEMICONDUCTOR OPTICAL AMPLIFIER CONFIGURATION, IEEE photonics technology letters, 10(11), 1998, pp. 1569-1571
Demonstration of polarization independent optical phase conjugation by
four-wave mixing in a monolithic Mach-Zehnder interferometric semicon
ductor optical amplifier (SOA) configuration. An integrated filtering
mechanism for the punp-signal enhances the conjugate-to-pump ratio by
15 dB compared to the single SOA case.