Oclaro Japan, Inc.

Mitsuo Akashi

Takanori Suzuki

Hiroaki Inoue

Shigehisa Tanaka

Hiroyasu Sasaki

Kohichi Robert Tamura

Shigehiro Takashima

Yoshikazu Era

Atsushi Takai

An optical module includes a semiconductor optical device in which an active layer located at one side, an electrode located at the same side, and a mirror that reflects light toward the side opposite the electrode are monolithically integrated, a sub-mount having one surface on which a first wiring pattern is formed, a substrate in which an optical waveguide and a grating coupler are formed in a surface layer of the substrate, a spacer having an upper surface on which a second wiring pattern is formed, and a wire. The sub-mount is mounted on the spacer. The first wiring pattern on the sub-mount faces part of the second wiring pattern on the spacer and is electrically connected thereto. The second wiring pattern on the spacer includes a pad being disposed in a region exposed from the sub-mount and being bonded to the wire.

Optical module

In pattern synchronization for correctly regenerating received data, which is performed in an optical receiver for receiving an optical signal that has been subjected to quadrature phase modulation, signal conduction is quickly established without using duplicate combinations of bit shifting and pattern changing. A control method that does not involve verifying the duplicate combinations generated in modulation formats and pattern synchronization search orders. Specifically, a signal check circuit () performs data verification of data multiplexed by a MUX circuit () for multiplexing two data strings, and a bit shift pattern change control circuit () controls a bit shift circuit () and a pattern changing circuit () based on a result of the data verification and detects a correct combination of correct regenerated data to establish the signal conduction. At this time, for the bit shift circuit () and the pattern changing circuit (), the duplicate combinations are not verified.

Optical receiver

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Kanagawa, Japan

Mitsuo Akashi