Santec Corporation

Yuichi Takushima

Noboru Uehara

Yasuyuki Ozeki

Kentaro Yasunaka

An optical pulse evaluation device and an in-service optical pulse evaluation device is disclosed which are capable of characteristics evaluation of an optical pulse itself or a sample launched therein in a relatively high bit-rate region. The optical pulse evaluation device evaluates a pulse waveform expressing an optical intensity of the optical pulse, an instantaneous frequency of the optical pulse, or a modulated light prepared by modulating the optical pulse in a light source end. The optical pulse evaluation device also observes a waveform change after a known optical pulse is passed through a device such as an optical fiber to evaluate a waveform deterioration or a compensation behavior caused by the device. The in-service optical pulse evaluation device is capable of measuring a wavelength dispersion in an optical communication.

Optical pulse evaluation device and in-service optical pulse evaluation device

PROBLEM TO BE SOLVED: to realize a wide bandwidth light source capable of a stable operation providing a less spectrum variation. SOLUTION: Optical pulsesoutputted by this optical pulse-generating deviceare split by optical coupler. The one of split optical pulses is inputted in white light-emitting deviceto emit the white light having the wide bandwidth. The other split is inputted in optical band pass filterin operation-stabilizing circuit. Optical detectordetects a signal level of a specific wavelength and input in feedback circuitto generate first and second feedback signalsand. Ring resonator fiber laseruses any one of them and controls a rotation angle of the waveplate to realize stabilization of the output.

Growing community of inventors

Tokyo, Japan

Yuichi Takushima