公开(公告)号：US5259044A

公开(公告)日：1993-11-02

申请号：US878861

申请日：1992-05-05

申请人： Hideki Isono ,  Junko Watanabe ,  Hiroki Okushima ,  Tadao Shingyoji

发明人： Hideki Isono ,  Junko Watanabe ,  Hiroki Okushima ,  Tadao Shingyoji

IPC分类号： G02B6/12 ,  G02B6/42 ,  G02F1/01 ,  G02F1/035 ,  G02F1/225 ,  G02B6/10

CPC分类号： G02F1/225 ,  G02B6/12004 ,  G02B6/4286 ,  G02B2006/12159 ,  G02F1/0123

摘要： A Mach-Zehnder optical modulator with an output light monitoring function whereby emitted light from the modulator is monitored for controlling a DC bias voltage applied between a first and a second electrode provided on a first and a second branch optical waveguide. The end face of the waveguide substrate on the output side is obliquely formed and an optical waveguide is provided on the waveguide substrate for taking out reflected light from the output end face as monitor light. A photodetector for detecting the monitor light is attached to the side face of the waveguide substrate. By such arrangement, the length of the waveguide substrate can be made shorter than that in the prior art. As an alternative, such an arrangement may be made that a double refraction crystal for separating monitor light is attached to the end face on the output side of the waveguide substrate and a prism for correcting optical path is attached to the double refraction crystal.

摘要翻译： 具有输出光监测功能的马赫 - 曾德光学调制器，其中监测来自调制器的发射光，以控制施加在设置在第一和第二分支光波导上的第一和第二电极之间的DC偏置电压。 输出侧的波导基板的端面倾斜地形成，并且在波导基板上设置有用于从输出端面取出反射光的光波导作为监视光。 用于检测监视光的光电检测器安装在波导基板的侧面。 通过这种布置，可以使波导基板的长度比现有技术的长。 作为替代，可以将这种布置可以将用于分离监视光的双折射晶体附着到波导基板的输出侧的端面，并且用于校正光路的棱镜附接到双折射晶体。