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利用公共环形腔耦合实现了两路光纤激光器的无源相位锁定，研究了激光器之间耦合强度对锁相性能的影响。环形耦合腔主要由两个2×2的光纤耦合器组成，其构成了激光器之间能量相互注入耦合的公共通道，并使它们获得了初步的相位同步。考虑到耦合强度主要由成环光纤耦合器的耦合比决定，建立了分析耦合强度影响的理论模型，并从理论上研究了耦合比的大小和差异对环内光强和输出光强的影响。此外，实验上实现了两路掺铒光纤激光器的有效相位锁定，并通过分析远场干涉光斑和输出功率研究了锁相阵列输出激光束的相干性和合成效率。研究结果表明：足够的能量耦合强度是获得有效相位锁定的必要条件，通过增加耦合比来增大耦合强度可以提高锁相阵列的相干性，但会略微降低合成效率。“,”Passive phase locking of two fiber lasers which were coupled by a common ring cavity had been demonstrated , and the effect of coupling strength between them on the phase locking performance had been investigated in detail . The ring coupled cavity was chiefly composed of two 2í2 fiber couplers , which provided a common channel for mutual injection coupling and made the output phases of component lasers were primarily synchronized . The theoretical model of analyzing the effect of coupling strength was presented , which was based on the fact that the coupling strength between the fiber lasers was mainly determined by the coupling ratios of fiber couplers , and the effect of magnitude and difference of these coupling ratios on the circulating intensity in the common ring cavity and the output intensity of the phase locking array were investigated in theory . Moreover , efficient phase locking of two Erbium-doped fiber lasers with the common ring coupled cavity had been demonstrated , and the coherence of output lasers and their combining efficiency were also studied by analyzing the far-field interference pattern and output power of the array in experiment . The research results indicatd that adequate coupling strength was a necessary condition to achieve effective phase locking , and improving the coupling strength by increasing the coupling ratio can enhance the coherence of the phase locking array and decrease the combining efficiency slightly .