**120° Phase Difference Interference Technology Based on 3 × 3 Coupler and its Application in Laser Noise Measurement 120° Phase Difference Interference Technology Based on 3 × 3 Coupler and its Application in Laser Noise Measurement**

Yang Fei, Xu Dan, Cai Haiwen and Qu Ronghui Yang Fei, Xu Dan, Cai Haiwen and Qu Ronghui

Additional information is available at the end of the chapter Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/66129
