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JPH09127568A |
To stabilize a phase of an output signal and to simplify constitution of an optical system by simultaneously transmitting signal light superimposing a high frequency signal and local oscillation light through the same transmission line, ...
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JP2609163B2 |
PURPOSE:To reduce a manufacturing cost and to improve photoelectric conversion efficiency by employing wavelength converting means for aligning solar light wavelengths in a shorter specific wavelength zone than that of the band gap of th...
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JP2606191B2 |
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JPH09503598A |
PCT No. PCT/GB94/02240 Sec. 371 Date May 28, 1996 Sec. 102(e) Date May 28, 1996 PCT Filed Oct. 11, 1994 PCT Pub. No. WO95/10795 PCT Pub. Date Apr. 20, 1995A non-linear optical switch includes a semiconductor optical gain medium. The swit...
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JPH0990451A |
To provide a high frequency matrix circuit which is light in weight and small in size and is suitable to the large scale of signals and is capable of processing high frequency signals of wide range by converting high frequency signals in...
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JPH0979908A |
To enable a polarized light analyzer to only fetch the polarizing light information of a DUT original by means of an A/D converter by removing the rotating component of a plane of polarization from the beginning. The frequencies f1 and f...
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JPH0983434A |
To detect a narrowered transmission wavelength interval between slave stations with high accuracy and high responsiveness and to keep the transmission quality over a long period. In this system, an optical intensity modulation signal hav...
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JP2586985B2 |
PURPOSE: To provide an optical complex which has a higher throughput by providing power throughputs larger than a specific value from respective input ports to respective output ports. CONSTITUTION: A connection type 90° complex 30 has ...
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JPH0945984A |
To obtain a small and compact two frequency laser beam oscillator by creating two optical resonator lengths using a birefringence material arranged in a laser resonator and oscillating the laser beam with two frequencies corresponding to...
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JP2577905B2 |
Optical-fibre transmission system with heterodyne coherent detection, in which at the transmitting side the polarization of an optical carrier is modulated, and at the receiving side the beam resulting from the combination of the modulat...
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JPH0922038A |
To simultaneously transmit a radio communicating high frequency multiplexed signal and a monitor/control/test signal and to receive the radio communicating high frequency multiplexed signal in a super low noise characteristic and high qu...
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JPH0918422A |
PURPOSE: To change the polarized state of a main optical signal with a clock synchronized with the main signal, to extract the clock from the polarized component of the optical signal received through an optical fiber without being affec...
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JP2567776B2 |
PURPOSE: To obtain the optical transmission system in which a wavelength multiple number is extended and the system is economized. CONSTITUTION: A transmission terminal station forms a frame of a reference optical series whose wavelength...
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JP2520885Y2 |
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JPH08334800A |
PURPOSE: To simply and compactly constitute an optical signal amplifier low in noise and to conduct phase synchronization of an exciting light beam and an input signal light beam by using an optical interferometer as the laser resonator ...
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JPH08335912A |
PURPOSE: To provide an optical receiver provided with a dispersion compensation function used for a wide range wavelength without causing an excess loss. CONSTITUTION: A signal light from a transmission laser 1 is modulated by a modulato...
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JPH08334796A |
PURPOSE: To provide an optical wavelength conversion integrating element in which the variable wavelength width can be widen and the shift is smoothly conducted during the optical wavelength conversion. CONSTITUTION: This element is prov...
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JPH08334797A |
PURPOSE: To reduce the power penalty of the system as a whole, to make the size of the device smaller and to reduce cost by integrating a DFB laser which is the light source of controlling light beams, a wave summer and a Mach- Zhener in...
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JPH08328054A |
PURPOSE: To make it possible to drive a nonlinear optical element by a semiconductor laser by driving the nonlinear optical element while irradiating the element with exciting light in such a manner that the exciting light is made incide...
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JP2561464B2 |
PCT No. PCT/GB86/00352 Sec. 371 Date Feb. 18, 1987 Sec. 102(e) Date Feb. 18, 1987 PCT Filed Jun. 18, 1986 PCT Pub. No. WO86/07642 PCT Pub. Date Dec. 31, 1986.An optical coupling assembly is disclosed which comprises a semiconductor laser...
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JP2562623B2 |
A polarization diversity light receiving system using base combining arranged so that the control signal for the local oscillator laser (2) is the sum of squared values of received signals.
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JP2560648B2 |
PURPOSE: To generate stable clock light while improving the S/N of a signal for the control of a VCO to generate a clock and suppressing jitter at the clock light generator of a system for generating the clock light by comparing the phas...
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JPH08316555A |
PURPOSE: To obtain a heterodyne intermediate frequency ten or more time as high as one obtained through a prior art device by a method wherein an optical frequency shifter which is capable of shifting the frequency of one of two isolated...
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JP2558895B2 |
PURPOSE:To obtain a light having a wide light emitting spectrum without polarizing characteristic by shortening the cutoff wavelength of a single mode optical fiber added with rare earth element as compared with the oscillation wavelengt...
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JPH08304865A |
PURPOSE: To obtain wavelength conversion output light with which chirp is suppressed by using a narrow-band filter to the extent of not only prohibiting the wavelength of signal light before wavelength conversion but suppressing the freq...
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JPH08304430A |
PURPOSE: To suppress the bad influence of an electric noise by a voltage applied to an electro-optical element on a frequency shifter. CONSTITUTION: In a frequency shifter, a voltage is applied to electro-optical elements 11a, 11b, and t...
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JPH08288903A |
To provide such a demultiplexing device for optical digital signal having a fixed bit speed that a pulse generator can be controlled with a small number of circuits. A demultiplexing device is provided with an optical switching device 1 ...
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JPH08285875A |
PURPOSE: To obtain a stabilized frequency shifter having no temperature dependency, and a highly accurate and reliable optical displacement measuring apparatus, in which a voltage amplitude corresponding to optical phase shift of 2π can...
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JP2549885B2 |
An optical signal rejection filter has a beam separator giving light waves with two different transmission devices and with different propagation times. Optoelectronic detectors receive these waves and give equivalent electrical signals ...
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JPH08262513A |
To improve detection of light signals received from a single mode optical fiber and another polarization dispersion transmission medium. This device and its method use polarization diversity detection in order to compensate polarization ...
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JPH08262514A |
PURPOSE: To embody a light signal spectrum inverting device capable of inverting spectra on a light frequency base without changing the central frequency of light signals. CONSTITUTION: Odd pieces of ≥3 each of light signal spectrum in...
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JP2540935B2 |
Frequency division multiplex signal lights (1) are propagated through an optical fiber (10), and polarizations of the lights are collectively controlled by a polarization controller (2). The polarization-controlled signal lights are rece...
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JP2540951B2 |
In a polarization control system for use in an optical communication system comprising an optical fiber (11), first and second polarization control devices (31, 41) are controlled to make the optical fiber bidirectionally transmit first ...
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JPH08254725A |
PURPOSE: To provide a semiconductor optical waveguide device which allows the efficient taking out of wavelength conversion light by using a semiconductor optical waveguide of fixed loss. CONSTITUTION: Pumping light emitted from DFB-LD11...
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JPH08248358A |
PURPOSE: To compensate the fluctuation in a polarization state of signal light outgoing from an optical transmission line such as single mode optical fiber, etc., and to precisely amplify the signal light. CONSTITUTION: A polarizing beam...
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JPH08242203A |
PURPOSE: To obtain a very high speed and large capacity optical communication system by efficiently transmitting information. CONSTITUTION: Signal light obtained by time-dividedly multiplexing Nth order soliton pulses (1st to 4th soliton...
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JPH08240827A |
PURPOSE: To easily adjust a wavelength without requiring many light sources by providing a reference wavelength light source in a light wavelength converting block and using this light source in common in order to transduce an electric s...
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JPH08240512A |
PURPOSE: To provide a light source which can vary wavelengths in a wide range, has a narrow spectral line width and shows stable light output power and spectrum. CONSTITUTION: A light amplifier 1, a wavelength variable optical filter 2, ...
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JPH08240825A |
PURPOSE: To provide an optical receiver having the dispersion compensating function capable of adjusting a dispersing amount by changing a circuit constant, etc., so as to flexibly cope with it even when the dispersing amount subjected b...
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JPH08240826A |
PURPOSE: To reproduce a clock signal from a high-speed light signal without necessitating a strict demand. CONSTITUTION: Specified two frequency components are taken out from a laser beam oscillating with a single frequency. One frequenc...
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JPH08234255A |
PURPOSE: To enable a long-distance and high-speed transmission by compensating the wavelength dispersion of optical fiber which is the cause to limit the transmission speed and transmission distance, in an optical frequency multiplex tra...
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JPH08234256A |
PURPOSE: To exactly detect the light intensity of transmitted light with substantially no influence of noise, etc. CONSTITUTION: Supersaturated absorbers 1 to 4 which give thresholds varying stepwise, respectively, absorb the transmitted...
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JP2530927B2 |
PURPOSE:To improve energy efficiency by disposing a black body radiator and an optical fiber to face each other in a high-temp. atmosphere and taking light of a specific wavelength region out of the optical filter. CONSTITUTION:The black...
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JPH08220573A |
To provide an interferometer having a semiconductor light amplifier in one or both arms and converting information another the first wavelength to another prescribed wavelength. The original data signal of the first wavelength is connect...
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JPH08220579A |
PURPOSE: To realize a linear sweeping control of a modulating frequency, by delaying a part of the output light or a modulating signal of an E/O converter adequately by a delaying circuit, and detecting the variation amount of the modula...
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JP2527768B2 |
An optical demodulator in which a local oscillator reference signal and a frequency shift keyed modulated input signal are optically combined by means of an optical multiport junction (e.g. fig. 2). These signals are detected to produce ...
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JP2526153B2 |
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JP2523650B2 |
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JPH08204633A |
PURPOSE: To easily realize the improvement of a bit error probability by improving the quantization noise characteristic in a coherent optical communication system. CONSTITUTION: The receiver 30 receiving an optical signal sent from a tr...
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JP2519188B2 |
An optical receiver has an optical coupler means manufactured in integrated waveguide technology in the form of an optical 90 degree hybrid element which is preferrably adjustable with a phase control. Also included is an electronic ampl...
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