Nonlinear propagation of optical frequency comb and its application in phase noise detection

Precisely detecting phase noise in the optical fiber is one of the core techniques for high resolution microwave dissemination based on optical fiber link. In order to solve the problem that unwanted reflections from fiber interconnectors greatly reduce the accuracy of phase noise detection, we propose and demonstrate a spectrally shifted optical feedback scheme integrated with wavelength division multiplexing technique for precise phase detection based on nonlinear propagation of narrow band optical frequency comb in dispersion shifted fiber. Theoretical and preliminary experimental results show that the proposed approach efficiently suppresses the reflection noise.