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JP3556657B2 |
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JP3555860B2 |
To reduce the cost of a multiple wavelength batch converting device by branching a wavelength multiple signal light and also by branching a wavelength multiple pump signal. This optical branching filter inputs a wavelength multiple light...
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JP2004524578A |
An optical wavelength converter, particularly useful in a wavelength-division multiplexing communication system, including a semiconductor junction in one arm of a Mach-Zehnder interferometer through which a data signal at a first wavele...
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JP2004219447A |
To provide a wavelength conversion device for phase modulation optical communication which is high in conversion efficiency and less in the conversion restriction of wavelength.Incident light branches into first and second branched light...
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JP3550823B2 |
To realize the phase modulator which easily varies the carrier frequency and has a wide dynamic range. A branching circuit 101 which branches an input signal 11 into two, a phase inversion circuit 102 which inverts the phase of one outpu...
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JP3549801B2 |
A phase-lock loop (PLL) is formed by a voltage-controlled oscillator (51), a local optical pulse source (2), an optical branching device (12) for branching the locally generated optical pulse stream from the local optical pulse source (5...
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JP3546406B2 |
To provide a optical light control element having a high-speed wavelength conversion function capable of the same wavelength conversion without a wavelength filter. Depending on a first input light signal intensity with an optional wavel...
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JP3545977B2 |
To realize low noise optical amplification in a phase sensitive optical amplifier by a homodyne optical PLL system. An optical amplifier provided with an exciting light source, a phase sensitive optical amplifier receiving signal light a...
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JP2004170733A |
To provide an encoder / decoder having satisfactory coding /decoding characteristics, wherein interference between optical encoding signals is suppressed and an optical code multiplex communication apparatus of high performance and to pr...
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JP3537058B2 |
PURPOSE: To provide a multiplex optical frequency com generator widened in the generation width of side band waves. CONSTITUTION: The phases of laser beams varying in wavelength from each other made incident via an optical coupler 102 fr...
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JP3538189B2 |
To stably time-division-demultiplex ultrahigh-speed time-division multiplexed optical signals of over 100 Gbit/s into optical signals, in each channel using a simple configuration. Optical signals in N channels (N is an integer 2 or grea...
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JP2004157169A |
To provide a light detection apparatus capable of detecting incident light having a prescribed wavelength with high quantum efficiency and efficiently guiding light to a sensitive region of a photodetector by suppressing a loss of light ...
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JP2004516697A |
A optical communications apparatus has an optical transmitter (T) with a signal source (10) for supplying a data signal comprising data to be transmitted, a photo-emitter (40) for emitting photons, a spin injector (30) supplying spin-pol...
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JP3531546B2 |
To provide a light display device which does not include an electronic device, is easy to manufacture, and is a robust totally optical device. The optical luminescence display device 30 can be manufactured without electronic parts by irr...
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JP3529162B2 |
PURPOSE: To attain practical transforming efficiency and sensitivity without necessitating previous excitation and without changing visible light emitting intensity by adding an element having absorption level in a specific wave length b...
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JP3529195B2 |
PURPOSE: To obtain a converting material having good conversion efficiency and sensitivity for IR ray in 1.3μm wavelength range for optical communication and 1.6μm range for inspection of optical fiber lines by using an upward converti...
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JP2004147323A |
To improve the S/N of a heterodyne beat signal and to prevent a photo-detector from being damaged.An optical heterodyne detection system includes an attenuator (124) for attenuating an input signal (102) before composing the input signal...
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JP3527455B2 |
To perform the optical signal processing for reading information, such as a destination, in a optical signal at high speed. The optical signal processor is equipped on a substrate with an optical waveguide for input, an optical branching...
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JP2004513400A |
The invention relates to a display device (1) having pixel elements comprising a luminescent material (7) for emitting light when excited by, e.g. electromagnetic radiation. The pixel elements are provided with electrodes (5,9) which mod...
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JP3524038B2 |
To realize a demodulation system allowed to be used together with an analog optical link and capable of providing a large dynamic range and an SNR potential to a large RF signal band width. An optical carrier signal modulated by an RF si...
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JP2004512723A |
The invention relates to a method for detecting and processing the amplitude and phase of signal waves. A Modulated signal source generates the signal waves which are modified by transmission medium or by reflection and scattering by at ...
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JP3516032B2 |
To provide a light frequency converting device which can switch the light frequency of even a high-frequency signal having a small amplitude over a wide range by obtaining a high-order sideband wave even with the high- frequency signal h...
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JP3515741B2 |
To arbitrarily change the corresponding property between the frequency and oscillation wavelength of a clock signal. In the resonator of a wavelength tunable mode synchronous laser to which the clock signal corresponding to a prescribed ...
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JP3513675B2 |
PURPOSE: To simplify and miniaturize configuration by unnecessitating a light source for pump by forming a ring laser with the first and second couplers, optical amplifiers and first optical filters of input and output means and processi...
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JP2004072407A |
To independently adjust each CN (Carrier to Noise)ratio of a transmitting signal and an up-convert transmitting signal to simultaneously maximize both the CN ratios in an optical fiber transmitting device applying optical fiber transmiss...
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JP2004062105A |
To provide a device with built-in a wavelength variable light source capable of outputting light which does not contain unnecessary light and has only a desired wavelength.The unnecessary light is intercepted by an optical gate unit 104 ...
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JP2004054164A |
To provide a light signal waveform shaper capable of stably shaping the waveform of a light signal with simple constitution and control at a high speed without converting the light signal to an electric signal, and which is suitable for ...
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JP2004046524A |
To generate an approximate waveform with a simple structure at low cost in the generation of an optional function waveform and the electro-optical use of the function waveform.This waveform composition method for composing a waveform g(t...
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JP3496053B2 |
To provide an integrated type light frequency converting device which has improved response time when a high-frequency signal is turned on and off and modulated since the distance between a filter and a modulator can be shortened, specia...
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JP2004037805A |
To provide a wavelength converter capable of converting a wavelength to an optional wavelength in the wavelength range of tens of nm or more at high speed.The wavelength converter converting one or a plurality of wavelengths of inputted ...
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JP3493233B2 |
PURPOSE: To provide a radiation source unit of which frequency difference can be adjusted in a wide range without being affected by position shift of component elements. CONSTITUTION: A radiation source unit generates radiation source be...
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JP3486479B2 |
PURPOSE: To drive a frequency shifter using an electro-optical element stably and at a precise waveform. CONSTITUTION: In a frequency shifter, a voltage is applied to an electro-optical element and the phase of a luminous flux which is i...
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JP3485226B2 |
To suppress excessive spread of a signal light spectrum being a cause to deteriorate the waveform of a signal light by applying phase modulation with equal absolute value and inverted signs to two electric field components where polariza...
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JP3484648B2 |
To suppress the deterioration in light pulse waveforms by the nonlinear effect, dispersion and higher dispersion of optical fibers which arises at the time of embodying super-high speed optical transmission of several tens Gb/s or over. ...
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JP3476806B2 |
To provide a new device which is applicable to use in which phase conjugation optics is applied to optical communication, optical measurement, optical information processing, and other fields. A nonlinear optical medium (1) is supplied w...
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JP3467507B2 |
To provide a communication system without a phase noise that enhances the optical reception sensitivity so as to adopt a configuration not needing an optical amplifier acting like a noise source and that is not susceptible to the effect ...
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JP2003318863A |
To provide a variable delay optical buffer circuit for optionally controlling delay of optical signals for realizing an optical buffer circuit essential for realizing a superspeed optical network in the next generation and afterward.The ...
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JP2003315860A |
To provide an optical frequency converting apparatus of simple constitution.The optical frequency converting apparatus is equipped with a demultiplexing means (2) which receives an input optical signal an demultiplexes it as 1st and 2nd ...
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JP2003532906A |
An optical pulse generator having a high order transfer function that comprises a first and a second nested interferometric modulator, each modulator comprising an optical input, an electrical input, a first arm, a second arm and an opti...
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JP3460451B2 |
To provide a frequency modulator where CNR(carrier-to-noise ratio) performance is more improved. An input part 1 outputs a non-inverse signal 11 of an input signal 10 and an inverse signal 12. Two FM modulating laser parts 21 and 22 are ...
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JP3460724B2 |
PURPOSE: To provide a continuously sweeping optical oscillator which can be tuned electrically for sweeping frequencies over a prescribed band width. CONSTITUTION: Acoustooptical tunable filters F1 and F2 are arranged in the feedback rou...
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JP3459166B2 |
To reduce a band width required for an optical phase locked loop and to perform optical phase synchronizing for signal light from a laser beam source having an oscillation light frequency flicker by combining an optical phase locked loop...
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JP3458613B2 |
To provide the wavelength converter which efficiently converts a wavelength employing a simple constitution. Continuous light beams (probe light beams) 12 having the wavelength, which becomes the target of a wavelength conversion, are ma...
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JP2003295245A |
To input in a wavelength transformation circuit after signal light reaches predetermined strength.When signal light with wavelength λ and continuous light Pcw-in with wavelength λ' are input, an XPM type wavelength transformation circu...
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JP3451890B2 |
To provide a new broadband frequency modulation system which is not affected by a residual AM component of a laser and has excellent FM modulation characteristics. A 1st modulated signal and a 2nd modulated signal which are opposite in p...
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JP3450668B2 |
To make it possible to utilize a mode locking semiconductor laser as a multiple wavelength light source by providing the apparatus with means for discretely executing the optical phase transition of the continuous monochromatic light of ...
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JP3449503B2 |
PURPOSE: To make it possible to shift light signal frequency-multiplexed on a frequency axis while preserving modulation signal components and to extract and store the components by controlling the frequency of the input light signal, th...
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JP3450031B2 |
PURPOSE: To attain practical converting efficiency and sensitivity to infrared ray of 1.3μm band of optical communication band by incorporating at least dysprosium (Dy) or its salt. CONSTITUTION: The material contains at least Dy and it...
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JP2003527626A |
A semiconductor device for modulating an optical power light beam with an optical signal light beam contains a detector diode for absorbing the signal beam and a quantum well modulator diode for absorbing the power beam. Both diodes are ...
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JP2003526953A |
A controllable source of few photons operating at a predetermined wavelength. The source comprises a solid material (10) having a dilute concentration of elements (11) implanted therein that emit light at said predetermined wavelength, a...
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