An optical device comprises a Substrate, an optical waveguide, a laser diode, photodiodes,
and a filter. The Substrate is provided with a flat reference Surface and a V-groove recessed …

When a conventional optical receiver circuit is used, it is difficult to achieve noise reduction
or provide a multichannel capability due to a considerable circuit area increase. Disclosed is …

An optical circuit device includes: a Substrate and an optical waveguide layer having a core
and a cladding formed on the Substrate; an optical waveguide circuit of the core having an …

A highly efficient semiconductor optoelectronic device is provided. The semiconductor
optoelectronic device includes an active layer, an upper waveguide layer provided on the …

An optical communication device, including a module board which includes at least the
optical module inputting or outputting an optical signal, and the peripheral circuit connecting …

It is to provide an optical element, an optical module, an optical connector, and an optical
module manufacturing method that can quickly and very accurately control the amount of …

An optical communication system includes a first optical communication apparatus
configured to insert a wavelength control signal in a main signal to produce a modified main …

(57) An optical semiconductor device includes: an optical semi conductor element including
a light-emitting layer formed on a first principal surface, a first electrode formed on the light …

An optical semiconductor device of which the moisture resis tance and the like are improved
and the manufacturing method thereof are provided. An optical semiconductor device of the …

Provided is an optical transmission substrate including: a first substrate; an optical
waveguide which has clad covering a core and a periphery of the core and extends on an …