Chen C J, Wai P K, Menyuk C R
Opt Lett. 1990 May 1;15(9):477-9. doi: 10.1364/ol.15.000477.
The use of solitons is proposed for interferometric switching in birefringent optical fibers. Pulse propagation in the fiber is modeled by the coupled nonlinear Schrödinger equation, in which the ratio between the self-coupling and cross-coupling terms depends on the ellipticity of the fiber eigenmodes. It is shown that shadows occur unless the self-coupling and the cross-coupling are equal and that these shadows seriously affect the contrast ratio attainable by a switch. These two couplings become equal at an ellipticity angle theta approximately 35 degrees , and, within a tolerance of theta = +/-5 degrees , a contrast ratio of 10 or more can be achieved.
有人提出将孤子用于双折射光纤中的干涉式开关。光纤中的脉冲传播由耦合非线性薛定谔方程建模，其中自耦合项与交叉耦合项的比值取决于光纤本征模的椭圆率。结果表明，除非自耦合和交叉耦合相等，否则会出现阴影，并且这些阴影会严重影响开关所能达到的对比度。在椭圆率角θ约为35度时，这两种耦合相等，并且在θ = +/-5度的容差范围内，可以实现10或更高的对比度。
