OPTICAL RECEIVING APPARATUS, OPTICAL TRANSMITTER AND RECEIVER MODULE, AND OPTICAL TRANSMITTING AND RECEIVING APPARATUS

摘要

A housing accommodates an optical waveguide substrate, plural signal light receiving elements, and a signal-light-level monitoring light receiving element. Signal light and locally oscillated light are input into optical waveguides in the optical waveguide substrate from a first end face of the optical waveguide substrate. The plural signal light receiving elements are disposed aligned on a side of a second end face opposite to a side of the first end face of the optical waveguide substrate. The signal-light-level monitoring light receiving element is disposed on a side of a third end face or a fourth end face between the first end face and the second end face of the optical waveguide substrate and at a position closer to the first end face than to the second end face.

主权项

1. An optical receiving apparatus comprising:
an optical waveguide substrate in which optical waveguides configured to transmit signal light and locally oscillated light therethrough, and optical 90-degree hybrid circuits configured to cause the signal light and the locally oscillated light to interfere with each other are formed; a plurality of signal light receiving elements configured to receive the interfering signal light and locally oscillated light; a signal-light-level monitoring light receiving element configured to receive light branched from the signal light before interference with the locally oscillated light; and a housing that accommodates the optical waveguide substrate, the plurality of signal light receiving elements, and the signal-light-level monitoring light receiving element, wherein the signal light and the locally oscillated light are input into the optical waveguides from a first end face of the optical waveguide substrate, the plurality of signal light receiving elements are disposed aligned on a side of a second end face that is opposite to the first end face of the optical waveguide substrate, and the signal-light-level monitoring light receiving element is disposed on a side of a third end face or a fourth end face between the first end face and the second end face of the optical waveguide substrate and at a position closer to the first end face than to the second end face.