Simple measurement technique of the cross phase modulation in optical fibers using heterodyne detection technique

We present a simple measurement technique of the cross phase modulation in optical fibers. A pump laser generates a new optical component (Stokes wave) in a probe optical wave with the modulation frequency of a pump laser. We investigated optical heterodyning between the probe optical wave and the Stokes wave, which allows one to generate and evaluate a beat signal in the lower frequency range. With the probe optical wave including the Stokes wave, the cross phase modulation signal can be measured in the pump laser modulation frequency to the tens of kHz range.