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JP5558821B2 |
A system and method for modulating the frequency of electromagnetic radiation utilizes a frozen shockwave in a photonic band gap structure. The structure provides a discontinuity in lattice constant that functions as a shockwave, and tha...
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JP5536794B2 |
The present disclosure relates to a method and to a device (1) by which a train (2, 2) of short laser pulses of a mode-coupled laser (3) is compensated with respect to the carrier envelope offset frequency of the individual lines contain...
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JP5530205B2 |
When designing a demodulator for a DPSK-modulated signal, it is required that optical phase modulation is performed fast and the demodulator has a long lifetime. To achieve this object, a delay line interferometer inside the demodulator ...
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JP2014514596A |
An optical device includes a waveguide slab, first and second input port couplers, and first and second output port couplers located over a planar optical substrate. The waveguide slab has a plane of symmetry. The first and second input ...
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JP5527441B2 |
In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an interchannel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the...
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JP5522572B2 |
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JP5516698B2 |
In a wavelength-selective coherent receiver that can extract only a signal having a desired wavelength among from multiple wavelengths, the influence of noises is increased and the receiving sensitivity is deteriorated when the optical i...
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JP5509482B2 |
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JP2014098830A |
To generate a stable optical frequency com that keeps an appropriate operation condition.Two branch waveguides propagate light coming from a light source. Two optical modulation sections modulate the lights propagating in the two branch ...
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JP5497349B2 |
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JPWO2012070686A1 |
By optically phase-modulating the polarization-multiplexed BPSK signal to the polarization-multiplexed QPSK signal, the polarization-multiplexed optical signal is used to separate the polarization of the polarization-multiplexed BPSK sig...
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JP5486965B2 |
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JP5479322B2 |
A method of and an optical arrangement for generating a non-linear optical signal on a material excited by an excitation field, wherein with the excitation field coherent fields of first and second optical pulses of differing frequency a...
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JP2014072682A |
To provide an optical phase-locked loop circuit that implements an optical phase lock capable of suppressing a frequency detuning fluctuation by means of a third order phase-locked loop circuit having a simple configuration.The optical p...
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JP2014052606A |
To provide a phosphor substrate that has excellent view angle color display characteristics maintaining the same hue regardless of view angle and allows high luminance light emission by efficiently emitting fluorescent light emitted from...
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JP5437634B2 |
Structures and methods allow: transfer of quantum information represented using the states of light to a representation using the states of matter systems; transfer of quantum information represented by the states of matter systems to a ...
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JP5437223B2 |
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JP5435790B2 |
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JP5435443B2 |
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JP5420977B2 |
The interference phases of two optical delay line interferometers of an optical receiver adopting the DQPSK or the like are stabilized at points, which have a difference of 90°, without bifurcation of a receiving signal or receiving dat...
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JP5421007B2 |
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JP5416042B2 |
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JP2014016408A |
To prevent degradation in display quality due to local emission of intense light in a color conversion substrate.The color conversion substrate comprises: a light-transmitting substrate 1; a scattering layer 4b as a first color developin...
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JP2014014028A |
To provide an optical communication method, an optical transmitter, an optical receiver and an optical communication system, capable of suppressing inter-pulse interference in a signal mark/space level, which is one factor of EVM (Error ...
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JP5391660B2 |
The present invention discloses an optical coherent receiver, and a frequency offset estimating apparatus and a frequency offset estimating method for use in the optical coherent receiver. The optical coherent receiver includes a front e...
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JP5387243B2 |
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JP5387393B2 |
An optical hybrid circuit includes a multimode interference coupler; a first 2:2 optical coupler; a second 2:2 optical coupler; a third 2:2 optical coupler; and a phase controlling region. The first 2:2 optical coupler, the second 2:2 op...
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JP5373908B2 |
The present invention provides an optical 90-degree hybrid circuit for reducing wavelength dependency of an IQ phase difference. An optical 90-degree hybrid circuit according to the present invention comprises a first demultiplexing opti...
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JP5373901B2 |
An optical 90-degree hybrid circuit includes a first demultiplexing optical coupler having two or more first input ports and two or more first output ports, a second demultiplexing optical coupler having two or more second input ports an...
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JP5367299B2 |
To provide an optical modulation device capable of stabilizing a distortion characteristic of an angular modulation signal, in the optical modulation device provided with an optical phase modulator. The optical modulation device 100 comp...
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JP5365141B2 |
While altering a plurality of wavelength setting parameters according to a control sequence, a local oscillation light having a wavelength controlled by those wavelength setting parameters is generated. Further, the received signal light...
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JP2013543668A |
To provide a method and an apparatus for high-speed optical transmission and generation of a 16-quadrature amplitude-modulated signal in a simple and / or low-cost configuration. One embodiment of the present invention relates to using a...
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JP5358025B2 |
A method and a device for monitoring and controlling a phase difference based on DQPSK modulation are provided in the invention, and the method includes: performing the n th power multiplication operation respectively on a first differen...
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JP5360184B2 |
To provide an optical signal receiving device with a high reception accuracy, in an optical receiver combining coherent reception and digital signal processing. An optical signal receiving device has: a polarization beam splitter that ca...
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JP5354529B2 |
To provide an optical signal wavelength conversion device which can convert a wavelength of an optical signal of a high bit rate without inducing waveform distortion of the optical signal and can perform wavelength conversion regardless ...
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JP5339910B2 |
An optical demodulator and accompanying method(s) that demodulates a DQPSK signal employing a single optical delay interferometer comprising a free-space Michelson interferometer having two optical paths, connected to a 1x2 coupler. Posi...
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JP5334619B2 |
To provide an optical path length control device which can perform optical path length control flexibly. The optical path length control device has laser light sources 2 and 3 which generate a plurality of laser beams having different wa...
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JP5314815B2 |
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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JP5316631B2 |
A phase shift unit provides a prescribed phase difference (pi/2, for example) between a pair of optical signals transmitted via a pair of arms constituting a data modulation unit. A low-frequency signal f0 is superimposed on one of the o...
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JP5303323B2 |
To provide a low-loss, compact and inexpensive variable optical multicarrier generation device, and a variable optical multicarrier transmission device using the same. The variable optical multicarrier generation device includes: a conti...
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JP5301026B2 |
An apparatus calibrates an optical downconverter configured to receive an optical input signal at a signal input and an optical reference signal at a reference input, and to provide at multiple output nodes characterizing signals for cha...
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JP2013183171A |
To provide an optical phase synchronization loop apparatus capable of demodulating a signal of a high bit rate without using a wide-band analog arithmetic unit capable of precise multiplication in a wide band up to a few tens of GHz.The ...
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JP5278159B2 |
A polarization controller includes a first polarization controller, a demultiplexer, a second polarization controller, and a multiplexer. The first polarization controller controls the state of polarization of input light such that a par...
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JP5249975B2 |
A laser beam having a single wavelength (» 0 ) emitted from a laser light source (11) is converted at a wavelength shifter (12) into a laser beam having at least two wavelengths (» 1 , » 2 ), which is further demultiplexed at a beam s...
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JPWO2011152202A1 |
Provided are a PLC type demodulation delay circuit and a PLC type optical interferometer that enable miniaturization of a PLC chip for various arrangements of optical output waveguides. In the PLC type demodulation delay circuit 1, the a...
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JP2013140192A |
To provide an optical frequency comb generating device, which generates an optical frequency comb having variable frequency intervals depending on the intensity of an AC voltage from incident wide-band light (typically white light).The o...
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JPWO2011122539A1 |
Provided is a PLC type demodulation delay circuit that is not easily affected by the position dependence of the polarization conversion efficiency of the wave plate, is easy to realize good characteristics at the same time with both MZIs...
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JPWO2011122538A1 |
Provided is a PLC type demodulation delay circuit that can increase the degree of freedom in design and reduce loss while reducing the size. The PLC type demodulation delay circuit 1 includes a plane light wave circuit 1A that demodulate...
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JP2013134308A |
To provide an optical 90° hybrid circuit capable of suppressing deterioration of reception characteristics depending on wavelength of light to be input.An optical 90° hybrid circuit includes: a 1/2 wavelength plate pair 10 on which sig...
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JP5212467B2 |
Provided is an optical receiver which accurately demodulates an optical signal obtained by the differential phase shift modulation method. The optical receiver includes: an interferometer which branches the inputted optical signal into t...
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