| 摘要 |
PURPOSE:To provide a monitor function and to switch optical paths without moving an optical path switching part by utilizing the polarizing and separating operation of polarizing prisms, photodetecting a half of input light by a light receiving element and outputting the remaining half as output light directly. CONSTITUTION:The 1st and 2nd polarizing prisms 16a and 16b are arranged their polarizing films opposite each other, and the 1st polarizing prism 16a is used for photodetection and the 2nd polarizing prism 16b is used for optical transmission. The polarizing and separating operation of the polarizing prism 16 utilizes the difference in reflection coefficient between P polarized light and S polarized light at a Brewster angle. A half of the input light is therefore inputted to the light receiving element at all times and the remaining half becomes the output light, and when an LD is used as the light emitting element, the majority of the sent light becomes the output light at the time of optical transmission, but when an LED is used, the half of the sent light becomes the output light and a movable part functions only to cut of the light signal. Consequently, the monitoring function is provided, the optical axes of a movable block and a receptacle which switch optical axes are easily adjusted, and the cost is reduced. |
