Mitsubishi Electric Corporation

Junya Nishioka

Toshiyuki Ando

Eisuke Haraguchi

Shumpei Kameyama

Tomohiro Akiyama

Naoki Suzuki

Jiro Suzuki

Kiyoshi Onohara

Yuta Takemoto

Akihiro Fujie

Mikio Takabayashi

An optical frequency control device includes: a detection circuit to receive first light including a first frequency, receive second light including a second frequency, modulate the first light with a local oscillation signal, and detect a differential beat signal between the frequency of sideband light included in the modulated first light and the second frequency; a light source control circuit to change the second frequency by frequency-dividing the differential beat signal with a first frequency division number, by frequency-dividing a reference signal with a second frequency division number, and by outputting a phase error signal indicating a phase difference between the frequency-divided differential beat signal and the frequency-divided reference signal; and a signal processing unit to set each of the first frequency division number and the second frequency division number according to the set value of a frequency difference between the first frequency and the second frequency.

Optical frequency control device, optical oscillation device, frequency conversion device, and radio wave generation device

An optical transmission device includes: a controlled oscillator for outputting a calibration signal having an output frequency that corresponds to an input oscillation control signal; an electrical-to-optical conversion circuit for generating an optical transmission signal by superimposing a transmission signal in a radio frequency band and the calibration signal on an optical wave; an optical input and output unit for sending the optical transmission signal to an optical transmission path and receiving a reflection signal that is a part of the optical transmission signal from an optical reception device; an optical-to-electrical converter for converting the reflection signal into a radio frequency signal; a phase locked loop for generating the oscillation control signal so that radio frequency output of the optical-to-electrical converter is phase-locked with a reference signal input from a reference signal source; and a signal generation circuit for generating, as the transmission signal, the radio frequency signal phase-locked with the calibration signal.

Optical transmission device and optical transmission system

An optical transmitterincludes an optical phase modulatorthat performs phase modulation on a continuously oscillating light, a light intensity modulatorthat performs pulse modulation on the light on which the phase modulation is performed, to output the light as a transmission light, a first signal generatorthat generates a pulse modulation driving signal in which on and off time intervals are repeated periodically, to drive the optical intensity modulator, and a second signal generatorthat generates a saw tooth wave driving signal having an amplitude equal to an integral multiple of a driving voltage needed to acquire a modulation phase of 2&#x3c0; of the optical phase modulator, and having a constant period, to drive the optical phase modulator

Laser radar device

Growing community of inventors

Tokyo, Japan

Junya Nishioka