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以线性耦合波方程为基础，导出了在弱熔情况下平面型四光纤耦合系统的传播常数、本征模以及功率耦合特性，并首次利用“熔拉”法研制成功了平面型四光纤耦合器，得到的耦合器谱响应实验结果与理论结果基本一致．
Based on the linear coupled wave equation, the propagation constants, eigenmodes and power coupling characteristics of the planar four-fiber coupled system under weak melt conditions were derived. The planar four-fiber coupler The experimental results of the coupler response obtained are basically consistent with the theoretical results.