Optical waveguide module

Abstract

A reflection filter (4) is installed on the inner side of a slant groove (3) formed so as to cross an optical waveguide (2n) in a flat waveguide type optical circuit (1). Light reflected off the reflection filter (4) is detected by the optical detector (61n) of an optical detector array (60) to monitor the light intensity of a signal light. A sub-mount substrate (70) is installed on the upper surface side of the optical circuit (1) in association with the optical detector (61n), and the optical detector array (60) is held by an optical detector mounting surface (71) tilted at an angle alpha (0 DEG < alpha < 90 DEG ) with respect to the top surface of the optical circuit (1) so that reflection light from the reflection filter (4) is incident onto the light incident surface (63) of the optical detector (61n) of the optical detector array (60) at a specified angle [Phi]. Whereby, it is possible to implement an optical waveguide module capable of monitoring a light intensity correctly regardless of the polarization condition of a signal light.

Description

technical field [0001] The present invention relates to an optical waveguide module having an optical waveguide provided on a substrate. Background technique [0002] In an optical path using an optical waveguide such as an optical fiber or a planar optical waveguide, it may be desirable to keep the light intensity of the signal light propagating along each optical waveguide constant and to control the light intensity of the signal light to an appropriate value. In this case, the light intensity of the signal light is monitored in the optical path, or further, the light intensity is controlled according to the result of the monitoring. [0003] In the monitor of the light intensity of the above-mentioned signal light, a method of separating a part of the signal light by providing an optical coupler on the optical waveguide has been used so far. In this method, by setting an optical coupler at a predetermined position on the optical waveguide to separate about a few percent ...

AI Technical Summary

Problems solved by technology

In this case, if the polarization state of the signal light propagating along the optical waveguide is specified, the light intensity of the signal light cannot be correctly monitored

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