Theoretic analysis on mutual injection phase locking fiber laser array

We report on a new technique of mutual injection phase-locking fiber-laser array. This technique uses a 45o beam splitter as coupling device. Injection phase-locking process of the fiber-laser array is simulated and analyzed. Results show that constant values of phase differences are related to initial phases. Reflectivity of the beam splitter and transmissivity of cavity reflectors should be properly optimized in order to make injection phase-locking easier.