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利用多个2×2定向耦合器构成的级联光纤环形退偏器结构简单成本较低,且在一定程度上能有效地降低窄带光源输出偏振度,有较好的实际运用价值。从概率统计这一新角度说明了随着光纤环级联数的增加,输出光的DOP(degree of polarization)低于0.01的概率大大增加,退偏性能也进一步增加。
The cascaded fiber ring depolarizer constructed by using a plurality of 2 × 2 directional couplers has the advantages of simple and low cost, and can effectively reduce the output polarization degree of the narrowband light source to a certain extent, and has better practical application value. From the perspective of probability and statistics, it is shown that as the number of fiber ring cascades increases, the probability of DOP (degree of polarization) of output light below 0.01 is greatly increased and the depolarization performance is further increased.