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8184972 |
Method and apparatus relating to secure communication
Data is encrypted onto an electromagnetic beam by providing an electromagnetic beam having a signal component having a modal state, wherein the signal component is susceptible to accumulation of a...
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8155535 |
Optical receiver
An optical receiver for stably reproducing packets having different light receiving levels is disclosed. The optical receiver includes: a light receiving element for outputting a current in...
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8145072 |
DQPSK optical receiver
According to an aspect of an embodiment, a DQPSK optical receiver, comprising: a first LPF connected to a line branching off from between a first optical-electrical converter and a first data...
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8131161 |
DPSK optical receiver
A DPSK optical receiver includes a DPSK demodulation circuit, an optical bandpass filter, a first photodetector, and a first control circuit. The DPSK demodulation circuit demodulates a DPSK...
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8107823 |
Optical transmission module
In an optical transmission module having a communication module which is freely movable in a case, when a tensile force is generated on an optical cable after connection of an optical transmission...
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8103178 |
Linearized phase modulated analog optical links
A phase-modulated analog optical link that uses parallel interferometric demodulation to mitigate the dominant intermodulation distortion present in the link. A receiver for demodulating phase...
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8098991 |
Wideband RF photonic link for dynamic co-site interference mitigation
A method is provided for co-site interference mitigation in an RF communication system. Spectral nulls created in an optical domain may be used to mitigate interfering signals in an RF signal. The...
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8031993 |
Optical fiber interconnect device
A fiber optic interconnect device includes a silicon substrate having at least one groove formed therein. The groove includes a pair of sidewalls and a first end disposed at an end of the pair of...
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8023832 |
Light receiving circuit and digital system
A light receiving circuit (114) includes a light inputting circuit (113) which converts one-system optical signal to be outputted from an optical transmission path (101) to an electrical signal and...
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7995925 |
Optical receiver using beam combining and system using the same
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...
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7978401 |
Delay demodulation devices
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...
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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,...
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7961997 |
Space diversity optical receiver and system and method using the same
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...
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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...
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7949260 |
Evaluation and adjustment method of optical receiver and optical communication system
An evaluation method of an optical receiver of an optical communication system, including a DPSK (Differential Phase Shift Keying) signal modulated by a specific data series, a delay interferometer...
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7941058 |
Device and method for decoding an optical multi-level DPSK signal
The invention refers to a device (1) for decoding an optical multi-level DPSK signal (E), the device (1) comprising: means for receiving the multi-level DPSK signal (E); at least two means (3) for...
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7933523 |
Clock extracting apparatus
A clock extracting apparatus is provided. In the clock apparatus, two frequency components are made to have an equal magnitude by adjusting a temperature and current applied to an FP LD, and a...
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7916385 |
Apparatus and methods for optical communication
An optical circuit is disclosed, which may include a semiconductor optical amplifier (SOA); an optical filter operable to filter light emerging from the SOA; and a PIN for converting the light...
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7917032 |
Multi-bit-rate optical communication method, optical network unit, and optical line terminal
The present invention relates to a multi-bit-rate optical communication method, optical network units, and an optical line terminal that enable multi-bit-rate transmission of low bit-rate data and...
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7917042 |
High speed optoelectronic receiver
A novel 100+ Gbit/s opto-electronic receiver uses hybrid integration of a photodiode and a demultiplexer. The photodiode converts a high speed optical data stream to an electrical data stream that...
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7907806 |
Optical mixer
When a waveguide of second signal light outputted from a first optical coupler intersects a waveguide of first local light outputted from a second optical coupler, a waveguide of a first signal...
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7899332 |
Mobile terminal apparatus
An optical communication unit performs a bidirectional information transmission between a circuit device in a fixed housing and a circuit device in a moving housing with an optical signal. The...
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7885496 |
Light receiving apparatus, electronic apparatus and image display apparatus
Disclosed herein is a light receiving apparatus, including: a light receiving section including a light receiving element; a transparent part; and a light guiding part inserted in the groove; the...
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7877025 |
Phase monitor apparatus, phase control apparatus and methods thereof for optical DQPSK receiver
I branch is provided with a first interferometer, a first balanced optical detector, and a first data recovery circuit. Q branch is provided with a second interferometer, a second balanced optical...
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7877015 |
Optical to radio frequency detector
An optical to radio frequency detector comprises an optical guide for receiving two optical signal components having frequencies that differ by an amount corresponding to a radio frequency, and a...
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7869719 |
Method and system for automatic feedback control for fine tuning a delay interferometer
A method for receiving an optical signal is included where an ingress signal is split into a first portion and a second portion. A relative delay is induced between the first portion and the second...
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7865087 |
Bandpass filter circuit, band-elimination filter circuit, infrared signal processing circuit
A bandpass filter circuit 10 of the present invention includes: transconductance amplifier circuits 1 to 3; a common-mode feedback circuit 4 which outputs a first control signal to the...
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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...
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7853157 |
Systems and methods for the polarization insensitive coherent detection and the polarization division multiplexed transmission of optical communication signals
The present invention relates generally to the transport and processing of optical communication signals. More specifically, the present invention relates to systems and methods for the...
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7853156 |
Systems and methods for the coherent non-differential detection of optical communication signals
In various exemplary embodiments, the present invention provides coherent non-differential detection systems and methods for the detection of optical communication signals by the Brillouin fiber...
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7848658 |
Modulation scheme for tedons
A system and method for increasing transmission distance and/or transmission data rates using tedons and an encoding scheme to reduce the number of ones in a data signal is described. For example,...
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7844189 |
Phase controllable optical delay interferometer, optical differential phase shift keying demodulator using the same, and demodulating method therefor
An optical DPSK signal demodulator includes a signal separator that separates an optical signal into an input optical signal and an output optical signal in a signal optical path. First and second...
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7826752 |
Optical transmission apparatuses, methods, and systems
Apparatuses, systems, and methods are disclosed that provide for an agile coherent optical modem that can generate agile RF waveforms and data rates on a generic opto-electronic hardware platform....
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7826695 |
Light transmitting/receiving device
An optical transmitting and receiving device enabling incident light from an exterior to be detected with high precision is provided. With an optical transmitting and receiving device 1, a groove...
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7809216 |
Bi-directional signal interface and apparatus using same
A signal interface includes a dual-drive device having a first and a second input port that receive an outgoing signal. One of the first and the second input ports also receive an incoming signal....
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7801447 |
Method and system for signal processing by modulation of an optical signal with a multichannel radio frequency signal
A signal processing system is disclosed having a detector for detecting an RF signal, wherein the detector has plural detection channels. A modulator modulates an optical signal with the detected...
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7792431 |
Detection of an electromagnetic signal
A signal detector system (10) comprises a single signal detector (11) having a limited on-time during which any received electromagnetic signal can be assessed. The signal detector (11) receives...
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7751721 |
Optical DQPSK receiver apparatus
A first interferometer comprises a first delay element and a first phase shift element, and a second interferometer comprises a second delay element and a second phase shift element. The amounts of...
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7733562 |
Optical equalization of multi-level symbol constellations
A method of optically equalizing a multi-level (amplitude or phase) optical signal through the effect of an optical equalizer wherein the optical equalizer (OEQ) is placed at either a transmission...
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7734196 |
Optical receiver device
A DQPSK receiver extracts first and second phase modulation components from an input optical signal, and respectively converts the extracted components into the first and second data signals. The...
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7706695 |
Optical DQPSK receiver apparatus
An interferometer comprises a delay element and a phase shift element. The delay element delays an optical DQPSK signal by one-symbol time. The phase shift element shifts the optical DQPSK signal...
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7693419 |
Optical spectrum analysis using optical interferometry
Techniques and devices that use polarization rotation and optical interferometry to provide optical spectrum analysis of an optical signal.
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7684713 |
Phase control apparatus and optical DQPSK receiver
A calculation processing unit controls temperature of a Peltier device based on a slope of a waveform obtained by subtracting a waveform of a B-arm monitoring signal from a waveform of an A-arm...
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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...
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7660533 |
Quantum Fourier transform based information transmission system and method
A method of data compression and transmission include splitting a wave function representative of an input data set into an arbitrarily oriented elliptical polarization state and a comparator wave...
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7654752 |
Z-axis alignment of an optoelectronic component using a composite adhesive
An optoelectronic package that employs a spacer tool system to properly align an optical component within the device is disclosed. In one embodiment, the package includes a mounting surface, and an...
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7657189 |
Optical link
A system having a first optical modulator operates in a non-linear region thereof and fed by: an input radio frequency signal; and, a first optical frequency signal having a wavelength λ2. A ...
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7638351 |
Photodiode with fiber mode dispersion compensation
A photodiode and a method of fabricating a photodiode for reducing modal dispersion and increasing travel distance. The central region of the photodiode is made less responsive to incident light...
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7620330 |
Optical receiver device and method
An optoelectronic device has a bright detector and a dark detector and reduces noise in the output of the bright detector using the output of the dark detector.
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7616904 |
Waveguide photodetector with integrated electronics
A germanium on silicon waveguide photodetector disposed on a silicon on insulator (SOI) substrate. The photodetector is incorporated into a section of a planar silicon waveguide on the substrate....
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