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JP3732192B2 |
To reproduce an electric clock signal whose noise components are small, and to prevent the deterioration of a reception signal in gating even by the rotation fluctuation of the oscillation plane of an electric field vectors of an optical...
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JP2005352197A |
To make waveform deterioration due to a pattern effect not occur by converting a transmitted intensity modulating code to a Manchester code and inputting it to an optical limiter amplifier.A wavelength conversion element is constructed b...
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JP2005353769A |
To provide a variable frequency millimeter wave light source having a stable frequency and a wide variable region.The variable frequency millimeter wave light source 101 is a light source for generating an optical millimeter wave signal....
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JP2005345750A |
To provide an optical signal processor simultaneously performing optical signal processing and light clock reproduction with simple configuration.An input optical signal 1 is passed through a polarization separation delay unit 1000 to be...
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JP3726133B2 |
To obtain the gain of coding by super-additivity and to provide a quantum limit communication system utilizing the gain. A quantum communication method for making complex a communication resource being coded by using a quantum state incl...
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JP3727529B2 |
To generate optical signals of multiple wavelengths necessary for wavelength multiplex transmission with an inexpensive constitution by using a method of combining simple sine wave modulations. The output of a light source 1 which emits ...
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JP3718050B2 |
To control frequency and phase of laser beam without feedback control. This device is provided with a 1st beam source 2 emitting a laser beam of a frequency f1, a 2nd beam source 3 emitting a laser beam of a frequency f2 becoming a refer...
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JP2005300923A |
To provide a producing apparatus producing a balanced optical frequency comb in a plurality of light waves having wavelengths different from each other.A plurality (m) of optical waveguide parts having the same length are formed on an op...
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JP3708892B2 |
To reduce damage of edge parts of a substrate caused in polishing. A manufacturing method comprises: an optical waveguide forming step for forming a waveguide 12 in an x cut or y cut substrate 11; an electrode forming step for forming el...
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JP2005257939A |
To output a polarization entangled photon pair, using a waveguide non-linear element.A non-linear waveguide 22 generates signal photons and idler photons from pulse light generated from a pump light source 21, at a prescribed generation ...
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JP2005257860A |
To provide a polarization controlling circuit and method having high controlling speed and low controlling voltage.When an optical signal is inputted in a polarization beam splitter 32, the optical signal is divided into two optical sign...
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JP2005208515A |
To provide a wavelength conversion device which highly efficiently converts a wavelength with a simple construction.A light beam with an optical frequency f1 and a continuous light beam with an optical frequency f2 multiplexed and output...
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JP2005173530A |
To provide a for light signal processing method and device which processes coding and quantization with a light signal and which can process at higher speed.An optical coding circuit 200 optically codes pulse trains of a signal light hav...
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JP2005175657A |
To solve the problem of conventional information communication that wiretapping is theoretically possible by taking out a light beam from an optical fiber and wiretapping cannot be prevented even if the light beam passing through an opti...
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JP3666741B2 |
To set an optimum operating condition of a driving current, power of signal light and power of continuous light of a cross phase modulation type entire optical wavelength transducer. In this cross phase modulation type entire optical wav...
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JP3663083B2 |
To reduce intensity of an optical signal light by reflecting the input signal light of a 2nd multiplexed light composed of the input signal light and the modulated light of another wavelength and re-inputting the reflected input signal l...
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JP3661966B2 |
To eliminate deterioration in an AFC characteristic due to modulation data in an automatic frequency control AFC circuit for the phase diversity receiver for an optical phase shift keying PSK signal. The AFC circuit 12 allows a local osc...
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JP2005156802A |
To provide a highly accurate frequency variable light source with which an oscillating optical frequency is controlled with high accuracy and an optical spectrum measuring device using the same.The highly accurate frequency variable ligh...
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JP2005159522A |
To provide a device and a method for converting an RZ type optical signal into an NRZ type optical signal.An RZ type optical signal is inputted to a signal light input end 101 and the waveform is shaped at a light waveform shaping sectio...
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JP3660579B2 |
To provide a novel optical internet working router. The optical router, for which M×N frequency routers and N tunable transmitters are utilized, and a method accompanied therewith are provided. A packet to be routed is 'colored' accordi...
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JP2005128204A |
To optionally multiply a frequency of signal light without converting it into an electric signal, without using the frequency but with only one multiplier and with an unconverted optical signal.The variable optical multiplier is equipped...
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JP2005512136A |
The invention relates to positional data recording, and in particular, to a method and system for polling the concordance of a mobile radio terminal user for the transmission of positional data to a poller. Specifically, polling data are...
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JP3643061B2 |
To make the most use of the wide band property of a super-short optical pulse such as a femto-second pulse, and to superimpose information on the phase of each frequency component. At a transmission side, a phase modulation pulse 10 incl...
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JP2005109217A |
To provide a light receiving device and a light receiving system which can receive rapid serial signal light without using a demultiplexer.In the light receiving device 1, a waveguide 24 is provided on a semiconductor substrate 3, and is...
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JP3639198B2 |
To provide an electro-optic optical SSB(single sideband) modulator and optical frequency shifter having cyclic domain inversion structure whose structure is simple, whose adjustment is easy also, which operates at the high frequency of 1...
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JP2005099025A |
To provide a system for determining the spectral content of an optical signal.A method determines the spectral content of an optical signal. In particular, the optical signal and an optical local oscillator signal are provided to inputs ...
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JP3635557B2 |
To provide an optical signal processor which can stably time division separate superhigh-speed optical signals exceeding 100 Gbit/sec and can pass or branch/insert the optical signals of time division separated channels. A timing extract...
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JP2005070698A |
To separate a low-speed optical pulse signal from an ultra high-speed optical pulse signal.A clock regenerating device 16 regenerates a base rate clock pulse from an input optical pulse signal. A short pulse light source 18 outputs a pho...
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JP3625932B2 |
The wavelength convertor (100) includes an incoming optical pump signal (103) which is divided into two channels (106,107) by a coupler (105). The first channel is applied to a coupler (110) and a sound wavelength (108) added. The two si...
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JP3621993B2 |
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JP3621868B2 |
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JP3616532B2 |
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JP2005020459A |
To unify the operating characteristics of an encoder and a decoder by adjusting the operating wavelength of the decoder.The decoder 24 of the optical code division multiplex transmitting device is provided with a second SSFBG 44 and has ...
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JP3612557B2 |
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JP2005010277A |
To provide an electro-absorption type optical modulator having improved wavelength conversion efficiency.The electro-absorption type optical modulator consists of a semiconductor of a layered structure, and has at least an n-type clad la...
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JP3606628B2 |
In an optical transmission system for intensively modulating an optical wavelength with a sending signal to be transmitted and optically amplifying a modulated optical signal, a wavelength dispersion characteristic of a single mode optic...
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JP2004350184A |
To provide a wavelength multiplex access system in which wavelengths of an entire system can be managed only with the wavelength control of one laser light source in spite of the wavelength multiplex access system, and a master station a...
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JP2004349325A |
To provide a light wavelength converter which is improved in efficiency of optical coupling with a laser ray source so as to reduce the energy loss to the irreducible minimum.A core layer 12 added with rare-earth elements represented by ...
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JP3594510B2 |
To provide an optical module on which a general semiconductor optical element such as the semiconductor optical element including a refraction type photodiode and has a projection on its surface and the semiconductor element having no pr...
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JP3590741B2 |
To allow a repeater to easily extract a label independently of a data rate of a main signal light in an optical label multiplex transmitter that multiplexes control information (label) such as address information of a main signal light o...
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JP2004317810A |
To realize a device capable of directly converting the wavelength of signal light to an arbitrary wavelength without requiring high-power excitation light nor an optical filter for cutting excitation light.While the signal light is input...
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JP2004309679A |
To provide an optical buffer circuit which is capable of high-speed operation without requiring photoelectric conversion or electric-photo conversion and which can arbitrarily vary the storage time.The optical buffer circuit includes a l...
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JP2004294567A |
To provide a waveguide type optical frequency shifter using a surface acoustic wave which is integrated at a 1.55 μm band light wavelength used in an FSF laser.The waveguide type optical frequency shifter using the surface acoustic wave...
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JP2004279589A |
To provide a method and a device for developing a multiple wavelength light source, with which a plurality of single wavelength light sources are obtained with a simple construction and the multiple wavelength light source emitting light...
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JP2004530312A |
A method and system for AO3R functionality is presented. The system includes an AO2R device followed by an AOCR clock recovery module and an AOR retiming device. The AOR retiming device takes as input a recovered clock signal extracted f...
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JP3568801B2 |
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JP3566172B2 |
To remove instability caused by oscillation by avoiding the going around of the same wavelength by using a wavelength transducer, to realize miniaturization and integration, and to provide an optical packet buffer which can deal with als...
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JP3563563B2 |
To improve the quality of binary light signals by supplying the output signal generated as a result of the interference to intensify first and second complementary waves with each other or the interference to weaken the same with each ot...
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JP2004246101A |
To provide a device for converting an optical wavelength, which has only a few branching points and with which modulated input signal light is efficiently utilized.The device A1 for converting the optical wavelength is equipped with an M...
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JP3558575B2 |
To realize an optical packet buffer which is easily miniaturized and integrated, free from instability owing to oscillation, and adaptive to a non- isometric packet without restriction of the packet size. A variable wavelength conversion...
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