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| Number | Title | Issue Date |
| 8160458 | Optical phase-modulation evaluating device The present invention provides an optical phase modulation evaluating device that can measure and evaluate the precise degree of modulation in phase of an optical phase modulation signal in comparison with the conventionally-known optical phase modulation evaluating... | 04/17/2012 |
| 8099000 | Direct detection receiver using cross-polarization interferometer for polmux-ask system A differential delay detection system and method includes an optical splitter to split an incoming optical signal between a first path and a second path. The first path includes a cross-polarization interferometer configured to separately generate polarization indep... | 01/17/2012 |
| 8078067 | Optical receiving apparatus In an optical receiving apparatus for receiving an optical DQPSK signal, a phase difference between both arms of an optical interferometer is controlled to an optimum value. The optical DQPSK signal is incident on two optical interferometers in each which a delay-ti... | 12/13/2011 |
| 8055141 | Balanced optical signal processor An apparatus and method for reducing electrical signal intermodulation by processing a balanced electrical signal in the optical domain in a manner adapted to reduce noise and second order intermodulation, and converting the processed optical signal back to an elect... | 11/08/2011 |
| 8005375 | Optical receiver systems and methods for polarization demultiplexing, PMD compensation, and DXPSK demodulation A simplified optical receiver architecture capable of tracking and demultiplexing polarization-multiplexed signals, dynamically compensating for PMD using a variety of polarization controller technologies, and reducing the number of delay line demodulators by two fo... | 08/23/2011 |
| 7974543 | Optical receiver and a free-space optical communications using the same A device for phase distortion compensation across an optical beam is provided. The device is a part of an optical receiver, which can be used in free space optical communications, remote sensing, optical imaging and others. 2M inputs of the combiner inter... | 07/05/2011 |
| 7965950 | Performance optimized receiver with bandwidth adaptive optical filter for high speed long haul WDM systems The present invention provides a performance optimized receiver with a bandwidth adaptive optical filter for high speed long haul wavelength division multiplexed systems, such as 40 Gb/s and 100 Gb/s wavelength division multiplexed systems. The performance optimized... | 06/21/2011 |
| 7949262 | Space diversity receiver for optical communications An optical beam combiner is provided, which allows efficient collection of light for various applications: non-line of sight and free-space optical communications, remote sensing, optical imaging and others. A multitude of transverse scattered optical beam portions ... | 05/24/2011 |
| 7877026 | Radio frequency transmitter with on-chip photodiode array A radio transmitter integrated circuit includes a photodiode array circuit, a digital conversion module, a transmit baseband processing module, an analog conversion module, an up-conversion module, and a power amplifier circuit. The photodiode array circuit is coupl... | 01/25/2011 |
| 7860408 | Interferometer for demodulating differential M-phase shift keying signal An interferometer for demodulating a differential M-phase shift keying signal includes a PLC type interferometer main body, a heating portion that heats the PLC type interferometer main body, and an intermediate member having a higher stiffness than that of the PLC ... | 12/28/2010 |
| 7860409 | Optical receiver, optical receiving apparatus using the optical receiver and optical receiving method thereof An optical receiver includes an optical amplifier configured to amplify an input optical signal and output an amplified optical signal; and a light receiving element configured to convert the amplified optical signal into an electrical signal and output the electric... | 12/28/2010 |
| 7835650 | Optical domain frequency down-conversion of microwave signals A linear phase demodulator/down-converter comprises an optical amplitude modulator for modulating the amplitude of an optical input signal, a photo-detector, a loop filter and an optical phase modulator provided with a light source. The optical phase modulator/down-... | 11/16/2010 |
| 7792436 | Optical receiver corresponding to differential M-phase shift keying system A small size and low cost optical receiving apparatus, which can stably demodulate the signal, lights in accordance with the differential M-phase shift keying (DMPSK) system. An optical receiving apparatus comprises a light branching unit for branching the different... | 09/07/2010 |
| 7738798 | Optical differential-phase-shift-keyed demodulator apparatus and method A system and method for demodulating an optical differential-phase-shift-keyed (DPSK) input signal using a Fabray-Perot etalon filter. In one embodiment the system receives a transmitted wavefront from the etalon filter and uses a detector to generate an electrical ... | 06/15/2010 |
| 7706698 | Remote control system and receiver When operation keys are operated, a light-emitting device outputs an infrared signal corresponding to the operated operation keys. The infrared signal is applied to a light-detecting device. In response to the applied infrared signal, the light-detecting device gene... | 04/27/2010 |
| 7676162 | Phase monitor used in optical receiver Branches are grouped into a group 1 including first and second branches, and a group 2 including third and fourth branches. The signal after being passed through a dual pin photodiode in one branch included in the group 1 and being at the earlie... | 03/09/2010 |
| 7639955 | Method and apparatus for transmitting a signal using a chirp managed laser (CML) and an optical spectrum reshaper (OSR) before an optical receiver A method for transmitting a signal and a fiber optic system comprising: a frequency modulated source; an optical transmission fiber positioned to receive the output of the frequency modulated source; an optical filter positioned to receive the output of the optical ... | 12/29/2009 |
| 7558490 | Resonant detector for optical signals An electronic receiver for decoding data encoded into light is described. The light is received at an ultra-small resonant structure. The resonant structure generates an electric field in response to the incident light. An electron beam passing near the resonant str... | 07/07/2009 |
| 7532826 | Optical demultiplexer and receiver assembly Apparatus for demultiplexing a wavelength division multiplexed optical signal comprising a plurality of signals each having a different wavelength. The apparatus comprises a demultiplexer sub-assembly and a multi-channel receiver optical sub-assembly. The demultiple... | 05/12/2009 |
| 7437074 | Wavelength division multiplexing transmission system A WDM transmission system is provided which can multiplex/demultiplex and transmit wavelength division multiplexing signals, where signal lights have a different signal bandwidth, in a status without much deterioration of transmission quality. In the WDM transmissio... | 10/14/2008 |
| 7421212 | Detecting and locating pulses using a Bragg cell Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated light beam is proportional to the signal current. The modulated light b... | 09/02/2008 |
| 7415212 | Data communication system, data transmitter and data receiver A transmitter formed of two or more light-emitting sections such as LEDs, which are physically arranged in a predetermined manner, is disposed in the real world object, and each light-emitting section transmits data by flashing at a flashing pattern representing the... | 08/19/2008 |
| 7411725 | Optical signal demodulator A demodulator includes: a Michelson interferometer having: a half-mirror which splits an optical signal, emits a first split light to a first optical path, and emits a second split light to a second optical path; a first reflector which reflects the first split ligh... | 08/12/2008 |
| 7406263 | Combined wavefront sensor and data detector for a free space optical communications system with adaptive optics In an adaptive optics module, wavefront sensing and data detection are implemented in a single device. For example, an optical-to-electrical converter converts a data-encoded optical beam to an intermediate electrical signal, which contains both the data encoded in ... | 07/29/2008 |
| 7394995 | System and method for a compact optical receiver with wide dynamic range An optical receiver is disclosed comprising an erbium-doped fiber amplifier (EDFA) that is coupled to a photodiode and transimpedance amplifier without filtering output light signal in the EDFA. Optionally, a clock/data regenerator can be coupled to the electrical o... | 07/01/2008 |
| 7376359 | Digital regulated light receive module and regulation method The invention discloses a digital adjusting method for an optical receiver module, and the method implements real-time monitor of parameters, on-line adjustment and non-linear compensation. The digital optical receiver module includes elements as follow: a voltage o... | 05/20/2008 |
| 7373044 | Optical link module, optical interconnection method, information processor including the optical link module, signal transfer method, prism and method of manufacturing the prism An optical link module of the present invention for connecting light beams by deflection and including light-emitting devices arranged in a planar manner; an optical fiber bundle that is an optical waveguide for receiving the light beams from the light-emitting devi... | 05/13/2008 |
| 7366428 | Optical receiver An optical receiver includes a light-receiving part and a control part. The light-receiving part includes an APD, a PIN-PD, and a branching optical device. First signal light is incident on the light-receiving part and is divided into second signal light and third s... | 04/29/2008 |
| 7359513 | Quantum cryptography protocol An apparatus and method for implementing a quantum cryptography system encoding bit values on approximations of elementary quantum systems with provable and absolute security against photon number splitting attacks. The emitter encodes the bit values onto pairs of n... | 04/15/2008 |
| 7352928 | Tunable optical add/drop multiplexer The tunable add/drop multiplexer including a tiltable mirror, a fixed thin film filter, and first and second retro-reflector elements for redirecting express channels back out an input/output port and for redirecting drop channels back out an add/drop port, respecti... | 04/01/2008 |
| 7349158 | Diffraction grating-based encoded micro-particles for multiplexed experiments Microparticles 8 includes an optical substrate 10 having at least one diffraction grating 12 disposed therein. The grating 12 having a plurality of colocated pitches Λ which represent a unique identification digital code that is detected... | 03/25/2008 |
| 7348551 | Remote-control light receiving unit and electronic apparatus using the same A remote-control light receiving unit includes a remote-control light receiving unit body having a lens portion, and a light guiding member that guides transmission signal light received from a remote-control transmitter to the lens portion. In the remote-control li... | 03/25/2008 |
| 7343104 | Apparatus and method for receiving a quadrature differential phase shift key modulated optical pulsetrain An optical differential phase shift key (DPSK) receiver, a method of demodulating an optical DPSK modulated signal and an optical processor capable of operating as either a DPSK receiver or DPSK transmitter. In one embodiment, the DPSK receiver includes: (1) an opti... | 03/11/2008 |
| 7339726 | Modulating retroreflector array using vertical cavity optical amplifiers A vertical cavity semiconductor optical photoamplifer (VCSOA) is used as a modulating retro-reflector (MRR) as a pixel in an array. The boundary of the cavity in the VCSOA forms a mirror for reflecting an incident light as an amplified output. ... | 03/04/2008 |
| 7336908 | Optical transmission system using optical signal processing in terminals for improved system performance An optical communication system configured to operate with optical signals at lower signal to noise ratios than previously contemplated. The communication system includes a receiver having an optical pre-processor coupled between a demultiplexer and a detector. The ... | 02/26/2008 |
| 7330657 | Method to demultiplex wavelengths of light An apparatus and method for demultiplexing multiple wavelengths of light. In one embodiment, an optical signal having a plurality of wavelengths is provided to an optical-to-electrical (OE) circuit configured to convert optical signals into electrical signals. The o... | 02/12/2008 |
| 7327512 | Optical waveform monitor apparatus and oscilloscope A measured optical pulse and a sampling optical pulse having different wavelengths are input to a nonlinear optical effect, that is, (i) a nonlinear optical medium generating four optical wave mixing or three optical wave mixing, and the optical intensity of the wav... | 02/05/2008 |
| 7321736 | Optical receiving station, optical communication system, and dispersion controlling method The invention relates to an optical receiving station, an optical communication system, and a dispersion controlling method for precisely controlling chromatic dispersion in an optical transmission line or chromatic dispersion in an optical transmission line that va... | 01/22/2008 |
| 7315698 | Optical module and an optical receiver using the same The present invention provides an optical receiver that uses an avalanche photodiode (APD) whose multiplication factor m is controlled to compensate the temperature dependence thereof. An optical module of the present invention includes a light-receiving device in a... | 01/01/2008 |
| 7310473 | Optical antenna and wireless optical system using the same A light concentrator for an optical antenna gradually narrows from the light receiving end to the end in contact with a light detector, and has a refractive index that gradually increases from the first to the second end, to afford a greater acceptance angle for the... | 12/18/2007 |
