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JP2011081250A |
To simultaneously generate a plurality of multi-light frequency carriers which are different in center optical frequency while making the carriers be phase-synchronized with one another by using one multi-light frequency carrier generato...
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JP4636449B2 |
In a delay interferometer in which a Michelson delay interferometer unit is mounted in a package having first and second sidewall portions that are perpendicular to each other, the delay interferometer includes: a Michelson delay interfe...
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JP4635168B2 |
An apparatus is provided for using modulation signals to optically modulate a plural input lightwaves of multiple frequencies, including an input filter, an optical modulator configured to simultaneously modulate the plural input lightwa...
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JP2011027773A |
To compensate a loss generated by the intersection of waveguides.When a waveguide of a second TE signal outputted from an optical coupler 10a intersects a waveguide of first local light outputted from an optical coupler 20a at a waveguid...
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JP4617955B2 |
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JP4615578B2 |
The delay demodulation device 1 comprises: an input waveguide 2 which receives DQPSK signals; a Y-branch waveguide 3 which splits the input waveguide 2; a first Mach-Zehnder interferometer 4; and a second Mach-Zehnder interferometer 5. B...
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JP2011007802A |
To provide an optical frequency measurement system for achieving high speed and high resolution measurement of an optical frequency.A laser beam is modulated by an optical frequency comb generator 43 and the frequency of the laser beam i...
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JP4609688B2 |
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JP4612093B2 |
An optical coherent receiver in one embodiment has a heterodyne configuration, and in another embodiment has a homodyne configuration, in each configuration employs multiple feedback signaling and analog/digital processing to optimize re...
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JP4607312B2 |
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JP2010539540A |
A monolithic, Indium Phosphide (InP) differential phase-shift keying (DPSK) or differential quadrature phase shift keying (DQPSK) receiver that exhibits low polarization sensitivity.
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JP4590626B2 |
This invention is a tunable dispersion compensation apparatus that suppresses the effects of the transmission channel dispersion which impedes transmission when optical signals used in high-speed communications are transmitted across lon...
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JP2010262239A |
To provide a demodulator capable of suppressing deterioration in an extinction ratio while suppressing a large size of a device. The demodulator includes: a branching means branching a differential phase modulated optical signal into fir...
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JP4577945B2 |
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JP4575883B2 |
An apparatus and method for modulating an optical beam. In one embodiment, a method according to embodiments of the present invention includes splitting first and second optical beams having first wavelength and second wavelengths, respe...
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JP4570386B2 |
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JP2010237300A |
To suppress polarized wave dependence of phase delay in a 90-degree hybrid. The 90-degrees hybrid includes a signal light splitter 1A, a reference light splitter 1B, a first detection light generator 1A, a second detection light generato...
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JP4558814B2 |
The delay demodulation device 1 comprises an input waveguide 2 which receives DQPSK signals; a Y-branch waveguide 3 which splits the light waveguide 2; a first Mach-Zehnder interferometer (MZI) 4; and a second Mach-Zehnder interferometer...
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JP4558565B2 |
To provide a light waveform shaping unit having flat dispersion by compensating a dispersion slope and to provide an optical signal generating unit using the light waveform shaping unit. A pulse generating unit 1 is composed of a pulse s...
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JP4549710B2 |
An optical filter apparatus for processing an optical signal comprising a spectrum broadening device for spectrally dividing one or more channels of the optical signal into a discrete set of spectral components for each channel, a collec...
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JP4550187B2 |
A wavelength of pump is set to an anomalous dispersion area of an optical fiber for wavelength conversion and pump power is set to be larger than a predetermined threshold of MI so that wavelength conversion capable of flattening convers...
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JP2010206709A |
To shorten the time for adjusting a delay amount of a delay interferometer.An optical receiver 5 converts an input phase modulation signal into an intensity modulation signal using an optical interferometer 6 having two optical waveguide...
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JP4524431B2 |
A manipulator (400) for a fiber optic cable assembly (FOCA) provides microradian accuracy in control of the direction of a beam emanating from the FOCA. Such manipulators can control FOCAs to control the incidence angles of beams (330, 3...
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JP4517698B2 |
A wavelength conversion apparatus in which output direction of a wavelength-converted laser beam, having a wavelength converted by a nonlinear optical crystal and emitted through an output-window, can be brought close to the direction of...
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JP4518282B2 |
In a coherent optical receiver, a light intensity value of signal light providing an optimum reception state is determined when ideal signal light free from waveform distortion is used as the signal light in a state where local-oscillato...
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JP2010166527A |
To increase the safety of quantum key delivery and increase a key delivery rate while avoiding a remarkable drop of the safety even when a plurality of photons are mixed into a unit time slot. The common private encryption key delivery s...
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JP4511052B2 |
Concentrator for use with photovoltaic devices includes a waveguide (2) incorporating quantum dots. The quantum dots red-shift the incident radiation to produce red-shifted radiation which is internally reflected within the waveguide (2)...
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JP4502500B2 |
An optical time-division multiplex signal processing apparatus includes an optical dispersion part providing optical dispersion to an optical time-division multiplex signal and an optical clock signal, an optical detector coupled optical...
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JP2010152206A |
To provide an optical interferometer achieving temperature stability of a phase. The optical interferometer includes: a first branch part for branching input light at least into a first branched light and a second branched light; a secon...
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JP2010145944A |
To provide an optical device capable of improving the quality of a received optical signal, and to provide a method for receiving light. The optical device includes: spatial interference type interferometers 2, 3 having different light-c...
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JP2010139888A |
To provide a receiving device capable of suppressing deterioration of an eye opening due to a phase error. The receiving device (70) includes an interferometer (50) generating interfering light beams by the interfering with a phase-modul...
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JP4485745B2 |
An optical function device capable of controlling an optical signal with another optical signal, wherein a modulated input light Iin of a wavelength lambda 1 is coupled with a bias light Ibias of a wavelength lambda 2, and the thus coupl...
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JP2010136146A |
To provide an optical receiving device which requires a smaller number of optical components than the conventional technology.Provided is a device for receiving transmitted optical signals including a plurality of subcarriers from an opt...
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JP4484021B2 |
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JP4477273B2 |
A method of converting an optical wavelength includes providing a wavelength converter assembly with a photodetector and a laser that have a common epitaxial structure with areas of differing bandgap. The laser including a laser resonato...
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JP4479889B2 |
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JP2010123761A |
To provide a highly sensitive single photon level light detection apparatus in which integration, miniaturization, and power-saving are considered, and to provide, moreover, a sub-Poissonian photon number distribution light generation ap...
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JP4472222B2 |
The method of the present invention comprises the steps of providing a nonlinear optical loop mirror comprising a first optical coupler including first and second optical paths directionally coupled to each other, a loop optical path inc...
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JP4464408B2 |
An optical reception device realizes stabilization of reception sensitivity inexpensively and highly precisely. The optical reception device includes: a Mach-Zehnder type 1-bit delay unit including a one-terminal input port and two-termi...
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JP2010102294A |
To provide a diffraction grating for receiving differential phase shift modulation light capable of accurately detecting phase change, and to provide a light receiving device using the same.A transmission type diffraction grating 11 as t...
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JP4459547B2 |
A small-sized, high-functionality optical pulse compressor capable of generating a low-power, high-repetition-frequency ultrashort pulse train used for ultrafast optical communication and photometry, and a simple-structure optical functi...
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JP4452045B2 |
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JP4448651B2 |
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JP4442565B2 |
In a Mach-Zehnder optical circuit that has a 3 dB coupler 10 whereby an NRZ light signal 53 inputted to an input port 7 is distributed to both arms of the circuit, a 3 dB coupler 3 whereby CW light 52 inputted to an input port 8 is distr...
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JP4442946B2 |
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JP4444930B2 |
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JP4443912B2 |
An optical device for optical communication includes a first main electrode disposed between a first splitter and a second splitter on a first arm. A first auxiliary electrode is disposed between the second splitter and a third splitter ...
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JP4444689B2 |
An optical phase modulator made of lithium niobate or the like phase-modulates the output light of a single-wavelength laser light source 20 that emits CW light, and the phase-modulated light is inputted to a dispersion medium 22. The po...
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JP4436451B2 |
When in an optical signal amplifying triode 10, light of a second wavelength lambda 2, selected from among light from a first optical amplifier 26, into which a first input light L1 of a first wavelength lambda 1 and a second input light...
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JP4439199B2 |
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