高性能三端口全光纤开关

提出采用２×２和３×３单模光纤耦合器组合成的马赫－陈德尔干涉仪来制作全光纤开关。解决了在连续熔融拉伸两个耦合器组成马赫－陈德尔干涉仪的过程中，由于干涉的作用而无法监视光功率来控制第二个耦合器的分束比的问题。并且由于是连续熔融拉伸，保证了两条单模光纤干涉臂长度的一致，从而提高了单模光纤马赫－陈德尔干涉仪的性能，使得用其做成的三端口压电陶瓷电控全光纤开关具有宽频带的特性，其最小交调达到３０ｄＢ，附加损耗为０．２３ｄＢ。

High-Performance Three-Port Fiber-Optic Switch

A three—port fiber—optic switch using a 2×2 and a 3×3 directional coupler to form Mach—Zehnder interferometer is presented. In the consecutive fabrication of two fused couplers,not only the equal splitting ratio for both couplers, but the equal length of two single—mode fiber arms have been fabricated, which improved the switch performance a lot. The swich is PZT electrically controlled and has broad band. The mininum cross—talk reaches to 30 dB and the insertion loss is 0.23 dB.