Nippon Telegraph and Telephone Corporation

Ntt Electronics Corporation

Yuya Oyama

Katsuya Tanaka

Masahiro Suzuki

Hiroto Kawakami

Tomoyoshi Kataoka

Mikio Yoneyama

Masahiro Tachibana

Akihiko Matsuura

A light modulation device detects a power of the modulated optical signal modulated by each of an I-component optical modulator and a Q-component optical modulator, synchronously-detects a component of a frequency fd from the power of the modulated optical signal, outputs a dither signal of a frequency fd/n (where n is a positive integer equal to or larger than 1) applied to a first bias voltage or a second bias voltage when adjusting the first bias voltage or the second bias voltage, outputs two dither signals having a frequency fd/m (where m is a positive integer equal to or larger than 1, where n&#x3c;m), which are mutually orthogonal to each other, applied to the first and second bias voltages when adjusting a third bias voltage, and adjusting bias voltages by increasing or decreasing bias voltages based on a synchronous detection result.

Light modulation device and light modulation method

Growing community of inventors

Yokohama, Japan

Yuya Oyama