Opnext Japan, Inc.

Noriko Sasada

Kazuhiko Naoe

Masataka Shirai

Hideo Arimoto

Satoshi Tada

Osamu Kagaya

Masanobu Okayasu

Kazuhise Uomi

A wavelength tunable laser module for DWDM is used, in which a single electroabsorption modulator integrated laser is mounted and an oscillation wavelength is made tunable by temperature control. Driving conditions of a laser and a modulator are determined such that they have approximately the same modulation and transmission characteristics in a temperature control range. Such an electroabsorption modulator integrated laser is used and the driving conditions are incorporated, thereby a small, inexpensive wavelength tunable optical transmitter can be provided.

Wavelength tunable optical transmitter and optical transceiver

A chip carrier includes a metal-coated portion formed on a front surface of a substrate and to be mounted a device, and a rear surface of the substrate being coated with a metal, in which a metal-coated portion is formed on a side surface of the substrate and the metal-coated portion on the front surface of substrate is connected with the metal-coated portion on the rear surface by the metal-coated portion formed on the side surface of the substrate, thereby maintaining frequency characteristics of the optical semiconductor device.

Structure of chip carrier for semiconductor optical device, optical module, and optical transmitter and receiver

A semiconductor optical device has a semiconductor laser portion and a modulator portion which have different mesa structures. The mesa structure of the semiconductor laser portion is a ridge waveguide structure which has air around the mesa. The mesa structure of the modulator portion is a planarized ridge waveguide structure which has an organic insulator buried around the mesa.

Semiconductor optical device and optical transmission module

Even for a driving impedance of 25 &#x3a9;, high transmission waveform quality of an optical transmission module is maintained using an optical modulator element designed for a driving impedance of 50 &#x3a9;. The above can be achieved by adopting an optical modulethat includes an input electrode for electrical signals, an optical modulator element for modulating laser light using the electrical signals, a termination resistance element, a first bonding wire for connecting the input electrode and the optical modulator element, a second bonding wire for connecting the optical modulator element and the termination resistance element, and a third bonding wire for connecting the input electrode and the termination resistance element.

Growing community of inventors

Yokohama, Japan

Noriko Sasada