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JP2002539614A5 |
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JP3343241B2 |
To provide an optical modulator by multiple modulation capable of providing light intensity-modulated by a radio frequency even from a radio- frequency electric signal of a lower radio frequency, compared with a conventional configuratio...
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JP3339030B2 |
PURPOSE: To generate light utilizable as a secondary frequency reference standard of high frequency stability and set likelihood over a wide relative frequency range by subjecting frequency standard signal which is a primary frequency re...
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JP3338562B2 |
PURPOSE: To provide a light frequency modulation circuit which suppresses spreading of frequencies occurring in the fluctuation in the intensity of induced light at the time of executing light frequency modulation by applying a mutual ph...
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JP2002315027A |
To obtain a wavelength-group wavelength converter which enables wavelength-group exchanging, while keeping the size small and the cost low, without deteriorating the efficiency of exchanges.AWG 10 divides an input wavelength-group into w...
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JP2002310805A |
To provide an optical heterodyne detection system allowing high polarization independency (non-dependency) or intensity noise suppression.One example of this optical spectrum analyzing system comprises a depolarization element 307 having...
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JP2002305507A |
To provide an optical communication system that can efficiently apply vestigial sideband modulation even to an optical signal with a frequency chirp and a biased frequency spectrum while suppressing eye penalty so as to generate an optic...
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JP2002296629A |
To achieve a method for converting a wavelength, a wavelength converter and a wavelength multiplexing light source which are not susceptible to noise by high order optical four wave mixing.When a wavelength of a wavelength division multi...
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JP2002273583A |
To provide a machining device for a transparent medium in which machining is performed in the optimal state by monitoring the state of light in a position (machining point) where the interaction between a machining laser beam and an obje...
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JP2002246676A |
To solve a problem that a whole system becomes complicated, cost becomes high and a phase synchronizing signal generator and a wavelength converter are developed as individual technology in a conventional case since the wavelength of an ...
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JP3315841B2 |
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JP2002214656A |
To provide a single sideband optical frequency comb(SSB-SC OFC) generating device which generates a comb-shaped spectrum having components only at integral multiples of a modulation frequency as its output over a wide band area and suppr...
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JP2002214461A |
To provide a light signal processing beam forming circuit which can control the directivity of a microwave radiated from an antenna over a wide range and realize a smaller antenna and to provide a laminate type optical waveguide array us...
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JP2002207230A |
To provide a system for optical heterodyne detection to generate a heterodyne signal whose SN ratio is improved.The optical heterodyne detection system includes a tunable optical preselector (514; 914; 1514; 1714) adjusted so as to track...
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JP3302088B2 |
PURPOSE: To provide an integrated optical coupler, a semiconductor conductor amplifier, and an optical communication network using these devices by integrating an optical device, especially, a normally open semiconductor optical switch t...
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JP2002198915A |
To provide an optical transmission system which maintains the quality of transmission easily and in good condition.An optical transmission system composed of a transmission node 14a-14d which transmits an optical signal, a common optical...
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JP2002182255A |
To provide a wavelength converting device for superspeed optical signal processing for actualizing a wavelength converter used for optical coupling, superspeed optical signal processing, etc., of a WDM optical communication network.The w...
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JP2002171541A |
To provide a wavelength selector, a converter and a photonic switching matrix incorporated with them.The photonic switching matrix includes a demultiplexer having n-sets of outputs through which wavelength selectors and converters are co...
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JP2002162659A |
To provide a single side band optical frequency comb generator of a novel system using a light signal circulation loop including an optical modulator of a two-electrode structure and an optical fiber amplifier.The optical modulator and t...
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JP2002156671A |
To provide an optical wavelength converter which converts a plurality of optical bits from a first wave to a second wavelength.The optical wavelength converter has a directional coupler. The directional coupler has a first waveguide whic...
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JP2002152133A |
To convert the signal light of RZ form to the signal light of NRZ form in all optical systems.When signal light S of RZ form, with which pulse width is 25PS, and four pump beams Sp1-Sp4 of different wavelengths are inputted to a waveleng...
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JP2002514782A |
The present invention relates to a fiber grating which introduces a plurality of asymmetric microbends in a fiber. The present invention also relates to fiber optic devices, such as a fiber-optic filter, a fiber-optic polarizer, a fiber-...
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JP2002141749A |
To provide a modulation estimate processing method that solves a problem that disables a modulation estimate processing depending on the level of a received signal.L.P.F processing sections 21, 22, threshold value decision processing sec...
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JP2002139758A |
To provide a device for shortening light wavelength in which the variation of wavelength of light does not occur even if energy of an electron beam from an electron beam source is varied, or/also, a shortened wavelength of light can be e...
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JP2002514322A |
Disclosed is an all waveguide fiber wavelength converter which makes use of modulational instability to convert signal wavelength over a conversion bandwidth while maintaining low pump laser power relative to other wavelength conversion ...
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JP3282135B2 |
PURPOSE: To measure a relatively wide distance range with a high distance resolution by dividing a reference light into two light waves and then giving frequency shift and delay to one of them and then performing multiple wave- synthesis...
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JP2002135209A |
To shorten a delay incident to detection of an amplitude modulated optical bit pattern significantly by eliminating the need for optoelectronic conversion in the detection, thereby eliminating the need for converting an optical signal in...
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JP2002124924A |
To overcome a problem that an expensive optical attenuator is required and the attenuation amount and modulation factor need to be regulated for each slave station to make constant the level of a modulated electric signal inputted to a d...
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JP2002116472A |
To realize a semiconductor integrated circuit which has small number of parts, can be easily integrated, can be manufactured at a low cost and has a wavelength converting function and a wavelength dividing function.The semiconductor inte...
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JP2002116473A |
To broaden a transmission band of wavelength multiplexed signal light.The wavelength multiplexed signal light in which a plurality of signal beams 101 to 104 (respective bands are 10 Gb/s) are wavelength multiplexed are chopped out by a ...
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JP2002511957A |
This invention relates to optical devices such as a fiber-optic frequency shifter and an optical interferometer. This invention also relates to a method of generating optical interference signals to obtain reliable sensor signals indepen...
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JP2002107780A |
To secure a wide transmission band while suppressing an injection current to a wavelength converter in the case of converting the wavelength of multi signal light of an unequal interval wavelength into that of multiple signal light of an...
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JP3273481B2 |
PURPOSE: To provide a full light type time division light pulse sepn. circuit and full light time division light pulse multiplexion circuit which are stable and are ultra high in speed as an optical fiber communication system with which ...
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JP2002098508A |
To reduce a measurement error due to fluctuations of optical path length occurring by fluctuation of the air in a space to an object to be measured in the case of measuring a range in fluctuating atmosphere.Measuring lights for the objec...
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JP2002094464A |
To provide an optical transmitter which can generate a modulated optical signal following a RZ pattern by only one optical modulator, without requiring a wide-band optical modulator or a driver circuit.An inputted data signal, following ...
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JP3269461B2 |
To provide a wavelength management system simplified for securing a wavelength stability of a multi-wavelength light source device with precision wavelength intervals, in a technical field using a wavelength multiplex optical transmissio...
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JP3266214B2 |
PURPOSE: To provide the IR visible wavelength upper conversion material which does not require preliminary excitation and is applicable to a detecting element capable of visually detecting IR light by using an inorg. material contg. two ...
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JP3265011B2 |
PURPOSE: To provide the light frequency shifter of a thin-film waveguide type which is high in conversion efficiency and can take a wider range of frequency shift quantity. CONSTITUTION: The input light of the waveform cos(wt) from a lig...
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JP3262331B2 |
An optical terminal has optical waveguides, 3-dB couplers, laser diodes, laser diodes provided with gratings, and connections on a substrate made of semiconductor material. The grating laser diodes have an external cavity which is formed...
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JP2002062558A |
To provide a modulated light signal recognizing apparatus and a modulated light signal recognition method by which 1 Tb/s class modulated light signals is recognized and to provide an optical distributor and an optical distribution metho...
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JP2002057629A |
To provide a frequency stabilization control circuit and an optical signal transmitter using the circuit which can surely pull in an intermediate frequency to an operation stabilizing point for controlling the stabilization of intermedia...
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JP3256713B2 |
PURPOSE: To obtain an error signal at the time of pulling and reduce periodic variation in transmission wavelength due to the modulation of the center wavelength of the transmission spectrum of a variable wavelength filter in a stable st...
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JP2002044021A |
To provide an optical heterodyine detection system for generating a heterodyne signal having an improved S/N ratio.The optical heterodyne detection system comprises an optical preselector (214, 814) having an adjustable pass band so as t...
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JP2002040503A |
To provide a wavelength converter which is usable in wide wavelengths and in which a light emission wavelength can be designed easily and whose cost is low because of its simple structure and which is capable of being miniaturized.This d...
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JP2002040504A |
To provide a wavelength converter which is provided with monolithically integrated delay loops existing in a delay interference constitution having only a solitary SOA(semiconductor optical amplifier).This wavelength converter is differe...
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JP3252946B2 |
To provide an optical frequency divider and the optical sampling device with high sensitivity and excellent time resolution without needing a high intensity pump light while detecting a signal light of low power. An optical pulse generat...
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JP2002031825A |
To provide an 'all optical' converter for converting an NRZ format input signal into an RZ format output signal.This is a converter of an NRZ signal with a bit duration T, which comprises an interferometer structure 10 having two pieces ...
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JP2002026820A |
To transmit a signal light by an optical polarization modulation system without requiring polarization control on a receiving side.Signal light is obtained by performing optical polarization modulation for making polarization orthogonal ...
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JP2002023211A |
To provide a time compensation architecture which uses an optical device as controllable delays.The architecture is constituted of a means which receives plural optical signals, optical means which selectively delay the respective propag...
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JP3249540B2 |
A narrowband laser source (Fig.3) includes an optical fiber section 17,26,27 including a core centered on a longitudinal axis and a cladding surrounding the core, and having a grating region (17)embedded in the core. The grating region i...
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