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7620274 |
Optical protection switch and method for optical protection switching
An optical protection switch and a method for optical protection switching are provided. The optical protection switch includes a loop mirror-based optical switch with two circulators and a...
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7616848 |
Optical transmission apparatus
In an optical transmission apparatus, optical power of each of wavelength contained in a wavelength multiplexing signal is measured, a measured value of the optical power of each wavelength is...
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7613370 |
Optical switch and method of adjusting optical switch
An optical switch includes an input port into which a multiplexed optical signal is input; a dispersing unit that, according to wavelength, disperses the multiplexed optical signal into a plurality...
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7609935 |
Optical vector modulator
An optical vector modulator includes an information generator that generates a plurality of N-bit streams at an output where each of the plurality of N-bit streams represents a desired modulation...
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7606488 |
Wavelength-division-multiplexing optical transmission system and control method thereof
In a wavelength-division-multiplexing optical transmission system in which optical-node apparatuses that perform relay transmission of wavelength-division-multiplexed light are located at specified...
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7606451 |
Optical communication system, optical reader, and method of reading information
An optical communication system includes at least one optical ID tag and at least one optical reader. Identification information is communicated between the optical ID tag and the optical reader...
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7603014 |
Method for the manufacture of optical fibers and improved optical fibers
The present invention is directed to a universal channel dispersion compensating fiber (CDCF) for WDM channel compensation that provides essentially zero dispersion slope over the wide wavelength...
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7603007 |
Quadrature phase-shift keying modulator and phase shift amount controlling method for the same
The improved quadrature phase shift keying modulator has a structure such that the average light output power of phase-shift keying modulation light output from the combining unit is changed...
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7599627 |
Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation
An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted...
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7593638 |
Secure upstream transmission in passive optical networks
A method and system for ensuring confidentiality of signal transmission in a point-to-multi point data transmission network like Ether net passive optical network, including at least one hub, at...
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7593607 |
Fast optical switch
A fast optical switch is needed to realize an economical and scaleable optical-core network. In the disclosed optical switch, switching is effected by rapid wavelength conversion. Either channel...
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7590316 |
Optical switch
An optical switch, comprises: a plurality of N input ports ( 2 ); a plurality of M output ports ( 24 ); and a plurality of displaceable beam steering arrangements ( 1 ) which, during switching,...
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7587138 |
Broadband 2×2 optical splitter
An optical device containing a four-port optical mixer capable of distributing the optical power presented at either or both of two input ports to specified ratios in two output ports.
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7587112 |
Optical device and light control method
In order to prevent a spectrum of a wavelength channel from becoming narrower, a device according to the present invention includes a light dividing section capable of dividing a wavelength...
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7574081 |
Optical system with optical waveguides
The present invention provides an optical system with waveguides, which comprises first, second and third optical input/output means ( 12, 14, 16 ), fourth and fifth multi-mode optical waveguides (...
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7574080 |
Technique for photonic switching
A technique for photonic switching is disclosed. In one particular exemplary embodiment, the technique may be realized as a method for photonic switching. The method may comprise receiving at least...
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7561799 |
Optical path switching device
An optical path switching device includes compact and unpackaged components; the components are mounted onto a single platform; and the components are coupled by luminous flux. Connection between...
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7561768 |
Optical branching device
An optical branching device comprises a first lens member comprising a transmitting plane surface, a transmitting convex surface having an approximate center of curvature in the transmitting plane...
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7558481 |
Method for optimizing enhanced DWDM networks
An enhanced Dense Wave Division Multiplexing (DWDM) network is optimized through bundling subchannel traffic in DWDM channels at network nodes and “hubbing” the DWDM channels at nodes receiving...
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7558456 |
Optical waveguide device
An optical waveguide device includes a lower cladding layer, a high refractive index region provided on the lower cladding layer, a pair of cores provided on the lower cladding layer on both sides...
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7558449 |
Electro-optically tunable optical filter
The present invention provides a method and apparatus for filtering an optical signal. The method includes receiving at least one input optical signal, forming first and second optical signals...
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7556439 |
Bidirectional optical assembly and method for manufacturing the same
The present invention provides a bi-direction optical assembly with two optical transmitting channels by a small-sized package and relatively low cost. In the bi-directional optical assembly, the...
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7555220 |
Chromatic dispersion compensator (CDC) in a photonic integrated circuit (PIC) chip and method of operation
An optical equalizer/dispersion compensator (E/CDC) comprises an input/output for receiving a multiplexed channel signal comprising a plurality of channel signals of different wavelengths. An...
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7555178 |
Periodic optical filter
A periodic optical filter for interleaving a plurality of optical signals to provide a multiplexed signal for transmission over an optical fiber is disclosed. The periodic optical filter includes a...
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7551816 |
Arrangement for low cost path protection for optical communications networks
An arrangement provides low cost path protection in an optical communications network. The arrangement has a portion 3 that provides (broadcasts) an outbound optical signal, and at least first...
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7551815 |
Method of monitoring and controlling the bit error rate (BER) in an optical communication network
A method is disclosed for monitoring and controlling the bit error rate (BER) in an optical communication network where an optical receiver in the optical transmission network. The method includes...
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7551814 |
Optical detection of user interaction based on external light source
An apparatus for employing ambient light collected from an external light source to detect a user's fingers that are gripping at least a relatively transparent portion of a case. The ends of a...
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7548680 |
Fiber optic local convergence points for multiple dwelling units
There are provided fiber optic local convergence points (“LCPs”) adapted for use with multiple dwelling units (“MDUs”) that facilitate relatively easy installation and/or optical...
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7546011 |
Monolithically integrated optical devices with amorphous silicon arrayed waveguide gratings and InGaAsP gain
An optical waveguide assembly and method of forming the same is described. The optical waveguide assembly includes a waveguide, an amorphous silicon arrayed waveguide grating communicative with the...
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7546004 |
Photonic interconnect system
A photonic interconnect system avoids high capacitance electric interconnects by using optical signals to communicate data between devices. The system can provide massively parallel information...
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7546001 |
Monolithic photonic integrated circuit (PIC) with forward error correction (FEC)
Monolithic photonic integrated circuits (PICs) utilize forward error correction (FEC) joint encoder or plural encoders or a joint decoder or plural decoders.
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7546000 |
Scalable and defect-tolerant color-center-based quantum computer architectures and methods for fabricating color-center-based quantum computer architectures
Various embodiments of the present invention are directed to color-center-based quantum computer architectures that are both scalable and defect tolerant and to methods for fabricating...
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7542653 |
Passive fiber organizer for mesh network node interconnections
A mesh optical network node has switch cards which carry active components, such as wavelength routers to switch the paths of optical signals through the node and a fiber organizer handles the...
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7542641 |
Multi-channel optical device
The multi-channel optical device includes a demultiplexer in a laser cavity. The demultiplexer is configured to demultiplex a multi-channel light beam into a plurality of channels. The device also...
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7542634 |
Low loss, noise filtering multiplexer/demultiplexer for reconfigurable OADMs
Agile OADM structures having a range of tradeoffs between costs and flexibility are disclosed. In certain implementations, cyclic AWGs (arrayed waveguide gratings) are employed. Excellent optical...
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7539364 |
Method and apparatus facilitating mechanical beam steering for optical integrated circuits
Actuators facilitating mechanical beam steering for optical integrated circuits are disclosed. The mechanical beam steering can mitigate thermal sensitivity of optical circuits, for example,...
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7534986 |
Optical wireless transmission system
A light emission section, including a light emitting element such as a semiconductor laser, emits a light beam in accordance with communication data. A light reception section, including a light...
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7532792 |
Optical coupler, a method of its fabrication and use
An optical coupler for coupling light from at least two input fibers into one output fiber and a method of fabricating and use of an optical coupler. The coupler comprises a) an input section...
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7532786 |
Light activated optical switch that includes a piezoelectric element with layers of piezoelectric material having different piezoelectric characteristics
A light activated optical switch has a piezoelectric element that has at least two layers of piezoelectric material with each layer having different piezoelectric characteristics. The piezoelectric...
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7532784 |
Integrated vertical wavelength (de)multiplexer
The invention describes an integrated-photonics arrangement, implementable in a multi-layer III-V semiconductor structure, which has a semiconductor substrate; an epitaxial semiconductor structure...
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7529437 |
Scalable and defect-tolerant quantum-dot-based quantum computer architectures and methods for fabricating quantum dots in quantum computer architectures
Various embodiments of the present invention are directed to quantum-dot-based quantum computer architectures that are scalable and defect tolerant and to methods for fabricating quantum dots in...
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7522790 |
Optical communications system with selective block/add capability of an optical channel
An optical communications system has a selective block/add capability of an optical channel. An optical beam separator receives and separates an input mixed optical beam into a separated optical...
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7519247 |
Wavelength selective optical switch
A wavelength selective optical switch particularly usable as a programmable N×M optical switch in a multi-wavelength communication system. The switch uses a grating that separates multi-channel...
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7515833 |
Optical double sideband modulation technique with increased spectral efficiency
An all optical network for optical signal traffic has at least a first ring with at least one transmitter and one receiver. The first ring includes a plurality of network nodes. At least a first...
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7515784 |
Field reconfigurable line cards for an optical transport system
A field reconfigurable muxponder for use in an optical transport system. The muxponder includes one or more tributary cards, where each tributary card is adapted to receive an optical data signal...
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7512296 |
Long cavity single-mode laser diode
Provided is a long cavity single-mode laser diode in which a ring waveguide is integrated such as a conventional array waveguide (AWG)-based laser or a concave grating (CG)-based laser.
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7512292 |
Multi-core strain compensated optical fiber temperature sensor
Methods and apparatus for discrete point temperature sensing include a temperature sensor that can be part of an array of temperature sensors for location in a wellbore. A single unitary...
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7509052 |
Optical receiver, optical transmitter and optical transceiver
An optical receiver includes a first light receiving element to convert an optical signal to an electric signal and to output the electric signal from one end. A light receiving element row is...
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7505647 |
Method and apparatus for demultiplexing optical signals in a passive optical network
Methods and structures are disclosed demultiplexing optical signals transmitted over an optical fiber into a silicon substrate and to multiple detectors. The silicon substrate has two spaced-apart...
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7499608 |
Apparatus and method for optical switching with liquid crystals and birefringent wedges
An optical switch includes an optical waveguide to route an input optical beam. At least one polarization switch receives the input optical beam from the optical waveguide. At least one...
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