Abstract
The theory of mutual injection phase-locking applied in two or three fiber lasers is extended in this paper. Four fiber lasers injected mutually by any two lasers are firstly modeled. And the four fiber lasers with the same frequency and coupling coefficient are numerically simulated. Simulation results show that with changing the initial phase difference between lasers, coupling coefficient and the initial amplitude, the locking phase difference between lasers would not maintain the same value. Therefore, an array with more than or equal to four fiber lasers injected mutually by any two lasers is not suitable for self-organized coherent combination of fiber lasers.
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