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将强耦合椭圆芯光纤定向耦合器的耦合区波导视作一矩形波导的微扰,到出其传播常数公式及场的幅度耦合波方面,从而给出耦合器的偏振特性。
The coupling region waveguide of a strong coupling elliptic core fiber directional coupler is regarded as a perturbation of a rectangular waveguide, and the formula of its propagation constant and the amplitude coupling wave of the field are given out, and the polarization characteristic of the coupler is given.