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JP3245932B2 |
PURPOSE: To provide a small, highly functional optical semiconductor device and make its manufacturing easy, by using at least two optical waveguides having given coupling degrees and located at upper and lower places in vertical section...
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JP2002006354A |
To realize a favorable oscillator in a sub-millimeter wave/terra-hertz band which has conventionally lacked a decisive factor in it.This oscillator is formed of a semiconductor bulk or a microstructure which receives mixed light and is a...
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JP2002006355A |
To provide a wavelength converter permitting to simplify its structure and also transmit excellent output signal light, and thereby contribute to cost reduction of an optical communication system.This device is arranged to be a wavelengt...
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JP2001356308A |
To provide an optical pulse period compressing/expanding device and an optical signal generator which require no precise adjustment, cause no degradation in optical signals, variably adjust an optical pulse period arbitrarily and have im...
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JP3242898B2 |
To provide an optical wavelength controller capable of pulling the optical wavelength of a light source which is indefinite and unstable in a central wavelength into a prescribed reference light wavelength at an optical pulling frequency...
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JP2001526413A |
Electro-optical devices comprising a multifaceted anisotropic acousto-optical crystal for transforming a single-frequency beam comprising two individual linearly-orthogonally, polarized input beams into an output beam having two linearly...
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JP2001339366A |
To provide a wavelength code division multiplex optical receiver that can automatically compensate deterioration of the reception characteristics due to a temperature change or the like.A filter circuit 31a filters the output electric si...
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JP3233178B2 |
PURPOSE: To reduce a non-linear state in an optical fiber to be used for transmitting AM or other information signals. CONSTITUTION: The spontaneous emission light source 210 has high spectral density in required wavelength. An integrate...
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JP3231545B2 |
PURPOSE: To obtain an optical frequency stabilizer and optical frequency selector applicable to a system having a frequency shifter by providing these devices with inverting means for inverting the output characteristics of synchronous d...
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JP2001523017A |
There is provided an optical wavelength converter which allows the rapid and efficient shifting of information modulated on a light signal of one wavelength to a light signal of a second wavelength without the negative effects of noise a...
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JP2001318395A |
To optionally select wavelength to be converted when the wavelengths of a wavelength multiplex signal light are converted together.Pump lights Pp1 to Pp4 having wavelengths λ5 to λ8 are inputted to optical couplers 116 to 119 as they a...
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JP2001522478A |
In an optical transmission system a transmitter (2) generates a sequence of time domain division multiplexed pulses and transmits them via an optical transmission medium (4) to a receiver (6). In the receiver (6) the received optical mul...
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JP2001521185A |
A soliton pulse generator is formed by providing an input continuous wave, stimulating Brillouin scattering of an input wave having a frequency determined by the frequency of the input continuous wave to generate a backscattered wave, co...
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JP3224622B2 |
PURPOSE: To improve the efficiency of a photoreceiver, a transmitter-receiver, and an optical link. CONSTITUTION: The photoreceiver is provided with a semiconductor laminated layer having an active layer 12 and a diffraction grating 16 h...
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JP3223286B2 |
PURPOSE: To make an operating frequency high and to improve sensitivity by a method wherein a voltage approximating to a subgap voltage at which an intermediate frequency output becomes maximum is applied as a bias voltage on a Josephson...
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JP3221642B2 |
PURPOSE: To realize an optical parametric circuit for separating strong exciting light, light mixed with four light waves and signal light to different ports. CONSTITUTION: This optical parametric circuit has an optical nonlinear medium ...
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JP3222205B2 |
PURPOSE: To provide an analog scanning converter by a deformable mirror device(DMD). CONSTITUTION: A scanning converter system is provided with a shift register 32 for receiving at least one system of serial input data from an input devi...
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JP2001281105A |
To provide a system and a method for optical heterodyne detection of an optical signal. This system for optical heterodyne detection includes an optical combining means for combining an optical signal obtained by combining a first signal...
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JP3216411B2 |
PURPOSE: To provide an optical frequency shifter which takes out exit light of a frequency shifted in plus relative to incident light and exit light of a frequency shifted in minus with one acousto-optic element. CONSTITUTION: A transduc...
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JP3216353B2 |
PURPOSE: To obtain a bright reading out image of a high contrast and high resolution by positioning a detecting and converting means, modulating means or light emitting means between substrates and composing one of the substrate of a fib...
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JP2001251251A |
To provide an optical signal reproducing device that can apply 3R reproduction to a signal.The optical signal reproducing device is provided with an interferometer structure having two arms 11, 12. Each of the arms 11, 12 has a medium wh...
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JP2001244885A |
To relax a demand for high-precision wavelength control over a laser light source in a remote node as to an optical circuit which modulates and outputs input light and a wavelength multiplex optical network constituted by using optical c...
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JP2001242502A |
To synchronize two optical chaos signals with each other in optical signals and synchronize two chaos signals with each other after photoelectric conversion by a simpler method.A 1st optical signal is generated by using a laser diode 10;...
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JP3204416B2 |
PURPOSE: To provide the spatial optical encoder of simple constitution which can increase the number of optical branches and obtain a high-speed light signal. CONSTITUTION: A high-speed short pulse train beam is branched by a spatial opt...
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JP2001235776A |
To provide an optical heterodyne detection system capable of bringing independence from polarized light, and suppressing intensity noise.An optical heterodyne detection system forms a combined optical signal by combining an input signal ...
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JP2001228497A |
To provide a wavelength conversion element capable of easily converting the wavelength of an inputted signal light with the same efficiency regardless of the polarization state of the signal light.This element is provided with an active ...
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JP2001228496A |
To provide a wavelength conversion element in which it is not needed to set the intensity of a signal light to be inputted exactly and in which the inverting of the waveform of the signal light posterior to the transformation is not pres...
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JP3201564B2 |
PURPOSE: To realize an optical multiplexer circuit having provisions for a ultrahigh speed signal with excellent control performance. CONSTITUTION: The circuit is provided with a means converting plural transmission digital signals b1-b5...
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JP3201566B2 |
PURPOSE: To demultiplex lots of channels altogether by using a 1st optical AND circuit to process an optical short pulse and a wavelength multiplexed light and using a 2nd optical AND circuit to process a signal light subject to multiple...
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JP3193220B2 |
PURPOSE: To provide an optical frequency controller capable of performing frequency shift covering a wide range and stable conversion in an optical frequency. CONSTITUTION: An optical pulse signal is outputted repeatedly at every period ...
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JP2001194692A |
To provide an optical wavelength conversion device with a simple configuration and with high practicality. When the strength (power) of a control light beam inputted from a control light beam input part 2 in a resonance type semiconducto...
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JP3188695B2 |
PCT No. PCT/GB91/02131 Sec. 371 Date May 20, 1993 Sec. 102(e) Date May 20, 1993 PCT Filed Dec. 2, 1991 PCT Pub. No. WO92/11554 PCT Pub. Date Jul. 9, 1992.An intensity dividing device (10) incorporates a rectangular multimode waveguide (2...
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JP3188697B2 |
PCT No. PCT/GB91/02133 Sec. 371 Date May 19, 1993 Sec. 102(e) Date May 19, 1993 PCT Filed Dec. 2, 1991 PCT Pub. No. WO92/11562 PCT Pub. Date Jul. 9, 1992.An optical mixing device (10) incorporates a rectangular multimode waveguide (14), ...
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JP3189045B2 |
To provide an optical waveguide converter capable of easily obtaining high energy photons from extremely low energy photons. A laser beam outputted from a free electron laser device 1 is converged and reflected by a condenser mirror 2 an...
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JP3188696B2 |
PCT No. PCT/GB91/02133 Sec. 371 Date May 19, 1993 Sec. 102(e) Date May 19, 1993 PCT Filed Dec. 2, 1991 PCT Pub. No. WO92/11562 PCT Pub. Date Jul. 9, 1992.An optical mixing device (10) incorporates a rectangular multimode waveguide (14), ...
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JP3183556B2 |
PURPOSE: To provide a variable-wavelength filter device wherein a wavelength can be detected and tuned without branching an optical signal and the number of constituent components for a receiver is not increased even when a wavelength mu...
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JP2001183714A |
To realize an optical limiter function which operates at a high speed, employing a simple constitution. Incident light beams (a wavelength λs) of an optical input port 10 are inputted into a port A of an optical circulator 12. Signal li...
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JP2001183711A |
To provide a light frequency conversion device which takes out optical signal components having a desired wavelength from frequency multiplexed signals that are transmitted by optical intensity modulation without using a variable type op...
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JP2001147456A |
To provide a clock extraction method which stably and economically obtains a frequency divided clock signal required for a time division isolation system of optical communication. A high frequency signal of which the oscillation frequenc...
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JP2001147409A |
To reproduce a signal as light as it is and to improve the waveform. The phase difference between optical paths 26 and 28 is adjusted to π by a phase adjuster 32. CW probe light 16 from a probe light input port 14 is divided into two by...
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JP2001142102A |
To provide an optical variable wavelength buffer which buffers optical packet signals and can follow up the fluctuation in the bit rate of the optical packet signals. This optical variable wavelength buffer includes a wavelength conversi...
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JP3168735B2 |
PURPOSE: To reduce the phase noise of a semiconductor laser light by performing demodulation by taking the product between a carrier component with the light amplitude modulated and a 1st sidewave component and to enlarge the 1st sidewav...
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JP2001117128A |
To enable wavelength conversion regardless of the polarization state of input light by eliminating the polarization dependence of an active layer and to prevent the signal wavelength after the wavelength conversion from chirping. This wa...
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JP2001109029A |
To provide the wavelength converting element for one-to-many wavelength, which is capable of reducing the limitation by the intensity of saturated light of a semiconductor light amplifier and is capable of increasing the number of conver...
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JP2001111494A |
To reduce a frequency error by compensating the temperature varia tion of an output from a frequency discriminator in a frequency stabilization control circuit in an optical transmission system. In an optical system for obtaining an inte...
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JP3157675B2 |
PURPOSE: To provide the method for optimizing the identification threshold value of a receiving device in a coherent light communicating system. CONSTITUTION: An optical signal made incident on a coherent light receiving device 11 is syn...
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JP2001094514A |
To make a device small-sized by using two optical heterodyne detection having a stable frequency interval without using a high frequency oscillator. Light emitted by LDs 1a and 1b is multiplexed and demultiplexed by a directional coupler...
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JP2001077755A |
To securely simplify the complexity of an optical transmission system, which requires an optical pulse compressing device, at low cost. The optical transmission system 100 includes an optical source 105, a dispersing element, and a passi...
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JP2001077462A |
To obtain a method and device for stabilizing the light emitting wavelength of a light source which emits a coherent light, without making equipment accompanied by more complicated nor processing insufficient. A method and device for sta...
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JP3142479B2 |
To provide an optical modulation element using EIT (electromagnetically induced transparency) of solid. This element is provided with an EIT layer 11 as the solid containing impurities which modulates the transmission intensity of a sign...
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