Fujitsu Corporation

Takeo Iwama

Hiroyuki Furukawa

Tetsuo Watanabe

Tetsuya Kiyonaga

Tatsuro Kunikane

Shigefumi Masuda

Yoshimitsu Sakai

Sadayuki Miyata

In an optical spectrum analyzer comprising a spectrograph and a photodevice array, and an optical spectrum detecting method, a wavelength deviation, from an assigned wavelength, of a light detected by a photodevice array which detects a wavelength of a diffraction light or a non-diffraction light from an acoustooptic device, is detected and a feedback control to a diffraction angle of the acoustooptic device is performed. Also, without using a feedback control, an exit light and a diffraction light from the acoustooptic device are respectively received by two photodevice arrays and the photodevices are arranged in order to mutually compensate gaps between the photodevices, whereby a center of each photodevice is similarly made coincide with a peak of an optical beam to be received.

Optical spectrum analyzer and optical spectrum detecting method

An optical parallel receiving module receives optical signals transmitted in parallel in a plurality of channels by using optical fibers. The optical parallel receiving module includes photo-electric conversion elements for converting received signals which are electric signals as received signals, limiter amplifiers for comparing the received signals and a threshold level, and data decision circuits for recognizing data at a timing in every period of received data using a reference clock. Each of the data decision circuits includes a data edge position detecting unit for detecting in which region of a plurality of regions a rising edge of the received data is and for outputting a detecting signal corresponding to a detected region, one period of the received data having a reference phase equal to a phase of the reference clock signal being divided into the plurality of regions; and a data acquisition unit to which a plurality of clocks having different phases and the detecting signal from the data edge position detecting unit are supplied, each of the plurality of clocks corresponding to one of the plurality of regions, for acquiring data at a timing of a clock corresponding to the region in which the rising edge of the received data is detected by the data edge position detecting unit.

Data decision circuit used in optical parallel receiving module, optical

A multicore optical connector comprising: a first connector part comprising a fiber array, a refractive index matching plate for preventing the diffusion of beams, and a lens array, in order mentioned thereabove, and a second connector part comprising a fiber array and a lens array, and wherein the diameter of each of the parallel beams that may be emitted outwardly from the lens array of the second connector part is relatively larger than that of the parallel beams that may be emmited outwardly from the lens array of the first connector part, and the first connector part and the second connector part are optically coupled such that both lens array are opposed to each other.

Multicore optical connector

A fiber-optic gyro includes a laser diode, a light detector, first and second lenses arranged on both sides of a half mirror, and a coil-like optical fiber which is arranged so that the two ends of the optical fiber confront the first and second lenses, respectively. Light from the laser diode is incident on the half mirror through the first lens, the light reflected from the half mirror is incident from one end of the coil-like optical fiber through the first lens, and the light transmitted through the half mirror is incident from the other end of the coil-like optical fiber through the second lens. Therefore the light is propagated through the coil-like optical fiber in opposite directions, light from the coil-like optical fiber is synthesized and is incident on the light detector, and the speed of the rotation angle is detected by the output of the light detector.

Growing community of inventors

Kawasaki, Japan

Takeo Iwama