Optical communications inventions 05/08

20080124073 - Method and system for providing ethernet protection: A method is provided for providing protection of a local area network (LAN) connection that includes providing first and second LAN cards in a multi-service platform. The first and second LAN cards each include at least one port. The first and second LAN cards are coupled to a network edge... Agent: Baker Botts L.L.P.

20080124074 - Method for handling channel failures in an automatically switched optical network: The present invention discloses a method for handling channel failures in an Automatically Switched Optical Network (ASON). When a channel alarm occurs, the head service node decides whether the channel alarm is incurred by a channel failure according to the alarm message or alarm information. If so, the head and... Agent: Ladas & Parry LLP

20080124075 - Ranging method and system for passive optical network and optical network unit thereof: A ranging method and system for passive optical network, and an optical network unit are provided. The ranging method includes: sending an initial ranging signal to a splitter loop-back device and recording a current sending time as a first time; receiving a loop-back ranging signal from the splitter loop-back device,... Agent: Ladas & Parry LLP

20080124076 - Osnr monitoring apparatus and method using polarization splitting: A method and apparatus is disclosed for measurement and monitoring of in-band optical signal to noise ratio (OSNR). A two channel optical spectrum analyzer (OSA) is advantageously applied in acquiring wavelength division multiplex (WDM) signal data after it has been split according to polarization, then deriving the in-band OSNR from... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20080124077 - Optical burst transport using an electro-optic switch: An optical node for optical burst transport includes optical components operable to transmit and receive optical signals over an optical transmission medium. The optical components include a demultiplexer that is operable to receive a wavelength division multiplexed (WDM) optical signal at an input port and to separate the WDM optical... Agent: Baker Botts L.L.P.

20080124078 - Optical switch and optical crossconnect apparatus: An optical switch is constructed by: first and second optical switches each having ports of k inputs and k outputs; a third optical switch of k inputs and k outputs which can perform a bi-directional transmission; 2k first optical circulators; 2k second optical circulators; and 2k selecting switches. First to... Agent: Mcdermott Will & Emery LLP

20080124079 - Method and apparatus for transporting local area network signals in optical transport network: The method for transporting LAN signal in an OTN is provided by embodiments of the present invention includes mapping a LAN signal into an adaptation protocol frame; mapping the adaptation protocol frame into a virtual concatenation group comprising at least one 1 Gbps level Optical Channel Data Unit (ODU); multiplying... Agent: Marshall, Gerstein & Borun LLP

20080124080 - Multicast transmissions in optical burst transport: Multicast transmission in an optical network includes receiving a primary token at a root node of the optical network authorizing the point-to-multipoint data transmission from the root node to a plurality of branch nodes of the optical network. It is determined whether the root node comprises a virtual output queue... Agent: Baker Botts L.L.P.

20080124081 - Predictive scheduling of data path control: A predictive scheduling technique in a communication network having a plurality of nodes, the network utilizing tokens to authorize data burst transmissions between the plurality of nodes, includes receiving a control message from a first node at a second node, wherein the control message comprises information regarding a data burst... Agent: Baker Botts L.L.P.

20080124082 - Optical power equalizer for passive optical network: A device capable of equalizing optical powers of optical signals in a passive optical network, the device comprising a first optical coupler for receiving optical signals having different optical power levels, an optical circulator capable of directing the optical signals from the first optical circulator, a laser diode capable of... Agent: Akin Gump LLP - Silicon Valley

20080124083 - Architecture to communicate with standard hybrid fiber coaxial rf signals over a passive optical network (hfc pon): One or more overlay wavelengths are applied to a GPON architecture to provide sufficient, cost-effective forward bandwidth per home for targeted, unique narrowcast services to allow traditional HFC operators to use a PON architecture with their existing HFC equipment. A separate return path capability using a separate coaxial cable with... Agent: Motorola, Inc. Law Department

20080124084 - Optical assemblies and methods for fabrication of optical assemblies: An optical assembly is formed with a silicon substrate having a first surface and a second surface confronting the first surface. A reflective coating is formed over the first surface. Multiple diffraction gratings are formed integrally within the second surface of the silicon substrate. An optical absorber is formed over... Agent: Townsend And Townsend And Crew LLP / Amat

20080124085 - Remote control transmitter: A remote control transmitter includes a transparent protective filter that covers a light emitting device in the light emitting direction. The filter is formed as a strip shaped, long and thin plate that is made from a transparent material that has a refractive index that is larger at least than... Agent: Darby & Darby P.C.

20080124087 - Multimode fibre optical communication system: A method of transmission of radio signals over all types of graded-index multimode fibre is provided. The method comprises launching optical radiation into the core of the multimode fibre with a specified restricted launch to allow multiple trans-verse mode lasers transmitters to be used in low cost radio over fibre... Agent: Goodwin Procter LLP Patent Administrator

20080124086 - System and method for high speed data communications: A method is disclosed for delivering data to an end user device, the method including receiving an optical signal containing broadband digital data; converting the optical signal to a first radio frequency signal; transmitting the first radio frequency (RF) signal from an RF transmitter to a first RF receiver in... Agent: G. Michael Roebuck, PC

20080124089 - Optical transceiver and method for coating the same: An optical transceiver comprising a metal case, and an insulating film at least partially covering a case projecting from a host device when the optical transceiver is set in the host device. A method for coating the optical transceiver to be set in the host device comprises steps for sticking... Agent: Mcginn Intellectual Property Law Group, PLLC

20080124088 - Optical transceiver having improved unlocking mechanism: An optical transceiver system includes an optical transceiver module configured to be locked to cage in a host electronic equipment and a key configured to remove the optical transceiver module from the cage, wherein the key comprises two fingers configured to be inserted into the cage and unlock optical transceiver... Agent: Fish & Richardson, PC

20080124090 - Optical receiver and an optical transmission system incorporating the same: An optical data receiver comprises an optical input for receiving optical data signals, an optical sputter for splitting the optical signals into first and second receiver arms, an optical filter in the first receiver arm, means for increasing an intensity ratio of optical signal strength in the first receiver arm... Agent: Workman Nydegger

20080124091 - Reduction of signal degradations in optical transmission links: Methods, devices and/or systems are provided for reducing signal degradations in optical transmission links. A means for ensuring a flexible manipulation for the improvement of an optical signal, especially during operation, is provided in a simple and cost-effective manner. To this end, a signal degradation in an optical transmission link... Agent: Kenyon & Kenyon LLP

20080124092 - Burst mode clock and data recovery circuit and method: Burst mode clock and data recovery (BCDR) circuit and method capable of fast data recovery of passive optical network (PON) traffic. An over-sampled data stream is generated from an input burst data signal and a phase interpolator generates sampling clock signals using a reference clock and phase information. A phase... Agent: Browdy And Neimark, P.l.l.c. 624 Ninth Street, Nw

20080118243 - Compact optical multiplexer and demultiplexer: Spatially-efficient optical multiplexers and optical demultiplexers include elements interrelating along orthogonal axes. A transmission block of extreme thinness has highly reflective coatings on opposed parallel surfaces. Lasers of multiplexer are on one side of transmission block with transmission axes perpendicular to transmission block surface. An associated multiplexed signal transmitting port... Agent: North Weber & Baugh LLP

20080118244 - Resilient packet ring (rpr) network system, rpr node device, redundancy method for the same, program and computer-readable medium: An RPR network system provides redundancy to the RPR function, at occurrence of failure in an RPR node device, to communicate with RPR node devices other than the failed device on an RPR ring and redundancy to an ethernet (registered trademark) port function to communicate a MAC frame via ports.... Agent: Mcginn Intellectual Property Law Group, Pllc

20080118245 - Optical node for mesh-type wdm optical network: An optical node capable of supporting a mesh-type optical network is provided. The node includes: N ROADMs, which separate specific wavelength channels from a multiple wavelength channel optical signal that is input from any node constituting the optical network, allows the rest of the wavelength channels to be passed, and... Agent: Blakely Sokoloff Taylor & Zafman

20080118246 - Encoding and decoding architecture and method for pipelining encoded data or pipelining with a look-ahead strategy: An encoding and/or decoding communication system comprises a framer interface, an encoder, a multiplexer, an output driver, and a clock multiplier unit (CMU). The encoder includes an input latch circuitry stage; an output latch circuitry stage; an intermediate latch circuitry stage interposed between the input latch circuitry stage and the... Agent: Mcdermott Will & Emery LLP

20080118247 - Method and apparatus for hemispherical retargeting: A method and apparatus for steering energy over a wide field of view is disclosed. The apparatus comprises a beam steering system for directing a first beam from an optical source across an image plane and a WFOV optical system having the image plane, the WFOV optical system mapping the... Agent: Gates & Cooper LLP

20080118248 - Generating of high rate modulated pulse streams: All-optical system for generating high rate modulated signals. An optical rate increasing device for use with the system includes: an optical loop including an optical amplifier and a gate and having a first terminal and a second terminal coupled to said optical loop, wherein the optical loop is arranged to... Agent: Empk & Shiloh, LLP

20080118249 - Generating of high rate modulated pulse streams: All-optical system for generating high rate modulated signals. The system includes: a signal generator for generating a first periodic signal at a first rate; an optical chopping device arranged to receive the first periodic signal and to produce therefrom a second periodic signal having pulses that are narrower than the... Agent: Empk & Shiloh, LLP

20080118250 - Optical module: An optical module comprises: a stem; a protruding portion on a surface of the stem; an optical semiconductor device mounted on the protruding portion; a power supply terminal penetrating through the stem, the power supply terminal being insulated from the stem; a first dielectric substrate mounted on the protruding portion;... Agent: Leydig Voit & Mayer, Ltd

20080118251 - Optical module: An optical module includes a stem with a piercing hole, an optical element mounted on a top surface of the stem, a lead which passes through the piercing hole, one end of the lead being connected to the optical element, and an insulating material in the piercing hole and insulating... Agent: Leydig Voit & Mayer, Ltd

20080118252 - Optical coupler with reduced pulse width distortion: An optical coupler having an optical transmitter and an optical receiver are disclosed. The optical transmitter receives a logic signal to be transmitted to a circuit connected to the optical receiver and a photo emitter for generating a light signal having an intensity related to the states of the logic... Agent: Kathy Manke Avago Technologies Limited

20080112704 - Methods and apparatus for generating local oscillation signals: Generating oscillator signals with which selected signals may be mixed. Such oscillator signals may be generated by dividing a pilot tone, such as a 120 MHz pilot tone found on many cable TV systems. Oscillator signals for demodulating received selected signals may be similarly generated.... Agent: Verizon Patent Management Group

20080112705 - Frequency selective mmw source: The present invention relates to the design and operation of a frequency selective electrooptic source. In accordance with one embodiment of the present invention, the electrooptic source comprises an optical signal generator, optical circuitry, and at least one optical/electrical converter wherein the optical signal generator comprises a plurality of optical... Agent: Dinsmore & Shohl LLP

20080112706 - Optical receiving apparatus and optical communication system using same: An optical receiving apparatus for reducing crosstalk in a WDM communication system is disclosed. The receiving device includes a wavelength division de-multiplexer for receiving and de-multiplexing a first multiplexed optical signal and a second multiplexed optical signal, a first receiver for photo-electrically converting the first optical signal input from the... Agent: Cha & Reiter, Llc

20080112703 - 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 output by mapping logical addresses to frequency bands, so that modulation of a selected frequency band can encode information for a specific location corresponding to... Agent: Hewlett Packard Company

20080112707 - Connector assembly: A connector assembly includes a motherboard and a connector. The motherboard defines a first plane and includes at least one fiber trace. The connector includes an optical lens, an electrical/optical converter, an electrical connector, and a circuit board connecting the optical lens and the electrical connector. The optical lens can... Agent: Samtec Incorporated C/o Keating & Bennett, LLP

20080112708 - Optical receiver, optical transmitter and optical transceiver: An optical receiver comprises a first light receiving element to convert an optical signal to an electric signal and to output the electric signal from one end thereof; and a light receiving element row connected to the other end of said first light receiving element to supply electric power to... Agent: Hogan & Hartson L.l.p.

20080112709 - Automated dispersion compensation over a broad wavelength range for coherent optical pulses: The present application is directed to an apparatus and method for the automated compensation of dispersion over a broad wavelength range for coherent optical pulses. In one embodiment, the present application discloses an automatic dispersion compensating optical apparatus configured to change chirp introduced into an optical signal by an optical... Agent: Brian F. Swienton Newport Corporation

20080112710 - Differential m phase-shift modulator: The present invention is a miniaturized differential M phase-shift modulator (M=2n: n is 2 or more) in which a plurality of Mach-Zehnder type light modulators each adapted to output a DPSK-modulated signal light by applying a driving voltage signal are arranged in parallel and that comprises a multiplexing waveguide adapted... Agent: Staas & Halsey LLP

20080112711 - Operational amplifier circuit, bandpass filter circuit, and infrared signal processing circuit: An operational amplifier circuit 5 of the present invention includes: a transconductance amplifier circuit 1 which converts a differential input voltage into a differential output current; a common-mode feedback circuit 2 which outputs a control signal to the transconductance amplifier circuit 1 so as to make a D.C. voltage level... Agent: Birch Stewart Kolasch & Birch

20080112712 - 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 transconductance amplifier circuit 1 so that a D.C. voltage level of a differential output of the transconductance amplifier circuit 1 is... Agent: Birch Stewart Kolasch & Birch

20080112713 - Waveguides for ultra-long range surface plasmon-polariton propagation: The disclosure relates to surface plasmon-polariton waveguides, which can guide ultra-long range surface plasmon-polariton waves. The attenuation of an ultra-long range surface plasmon-polariton waves is much lower than the attenuation of the conventional long range surface plasmon-polariton waves guided with the same kind of metal film or metal strip at... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP

20080107415 - System and method for discovering neighboring nodes: A method for discovering neighboring nodes includes establishing a first optical connection with a first node using a first link. The method also includes detecting a change in the first optical connection. The method further includes initiating a discovery process to detect whether the first node or a second node... Agent: Baker Botts L.l.p.

20080107416 - Method for realizing many to many protection switching of ring network: A method for realizing many to many protection switching operation of ring network including; determining information of a switch request of M:N protection switching of the ring network, a destination node of the switch request a source node of the switch request a flag of long or short path, a... Agent: Fish & Richardson Pc

20080107418 - Method and device for signal trasporting: A method for signal transporting in an optical transport network comprises: presetting frame structures for an optical channel payload unit OPUx and an optical channel data unit ODUx of a 5G-path transporting constant-bit-rate CBR5G rate-level signals in an optical channel layer; and according to the frame structures of the optical... Agent: Wolf Greenfield & Sacks, P.c.

20080107417 - Optical wavelength division multiplexed multiplexer/demultiplexer for an optical printed circuit board and a method of manufacturing the same: The invention provides an optical mux/demux for an optical printed circuit board. The mux/demux comprises: a first waveguide formed on a support layer for carrying a wavelength division multiplexed optical signal; a separator/combiner for separating the wavelength division multiplexed signal into component signals of corresponding wavelengths or for combining component... Agent: Pillsbury Winthrop Shaw Pittman, LLP

20080107420 - Optical wireless transmission system for performing optical space transmission, and optical transmitter used therein: An optical transmitter for performing high-rate data communication by means of optical space transmission is provided, which can reliably perform optical axis adjustment manually and visually, and can prevent a device from being made large in size and manufacturing cost of the device from being increased by using an simply-constructed... Agent: Wenderoth, Lind & Ponack L.l.p.

20080107419 - Portable wireless terminal for visible light communication: A portable wireless terminal for performing visible light communication with other devices through free space includes an optical detector for generating an electrical signal after photoelectrically converting some of optical signal input from free space and outputting the electrical signal; a reflector for retro-reflecting the others of the optical signal... Agent: Cha & Reiter, Llc

20080107422 - Serializer/deserializers for use in optoelectronic devices: An optoelectronic device implements a serializer array circuit or multi-channel CDR circuit to reduce the cost and size of the circuit. An efficient serializer array circuit includes a plurality of serializer blocks sharing the functionality of a single CMU to clock a plurality of serial signals out of the final... Agent: Workman Nydegger

20080107421 - Optically connectable circuit board with optical component(s) mounted thereon: An optically connectable circuit board and optical components mounted thereon. At least one component includes optical transceivers and provides an optical connection to the board. Electronic components may be directly connected to the board electrically or optically. Also, some electronic components may be indirectly connected optically to the board through... Agent: Law Office Of Charles W. Peterson, Jr. Yorktown

20080107423 - Optical transceiver and method of controlling optical output jitter using the same: An optical transceiver which can effectively reduce optical output jitter when an error is made during designing and manufacturing of a printed circuit board (PCB), and a method of controlling optical output jitter using the optical transceiver are provided. The optical transceiver includes a transmitter unit including an equalizing (EQ)... Agent: Rabin & Berdo, Pc

20080107424 - Bit stream conditioning circuit having adjustable input sensitivity: A high-speed bit stream interface module interfaces a high-speed communication media to a communication Application Specific Integrated Circuit (ASIC) via a Printed Circuit Board (PCB). The high-speed bit stream interface includes a line side interface, a board side interface, and a signal conditioning circuit. The signal conditioning circuit services each... Agent: Garlick Harrison & Markison

20080107425 - Optical signal processing apparatus, optical signal transmission system and optical signal processing method: Influence of polarization mode dispersion, occurring in an optical fiber is mitigated by means of polarization scrambling, differential group delay which a received optical signal has is optically suppressed; the optical signal in which differential group delay is thus suppressed is converted into an electric signal; and error correcting processing... Agent: Staas & Halsey LLP

20080107426 - Chromatic dispersion compensating fiber: Disclosed are an improved system and a related method for compensating the chromatic dispersion of a given length of a transmission fiber over a given spectral band by employing at least two chromatic dispersion compensating fibers that, with respect to the slope of the slope of the chromatic dispersion (SSi),... Agent: Summa, Allan & Additon, P.a.

20080107427 - Data transmitter and method of generating none return to zero optical signal with clock component amplification: The present invention relates to none return to zero (NRZ) modulation method. The NRZ optical modulation is performed by combining a clock signal and NRZ data at a sending end and signal distortion capable of being generated when the clock signal and the NRZ data are combined is optimized by... Agent: Blakely Sokoloff Taylor & Zafman

20080107428 - Optical transmitter and optical communication system: An optical transmitter includes an optical modulator, an optical coupler, a crosspoint monitoring unit, a reference-value setting unit, and a bias circuit. The optical coupler splits an optical signal output from the optical modulator into a plurality of optical signals. The crosspoint monitoring unit receives part of the optical signals,... Agent: Birch Stewart Kolasch & Birch

20080107430 - Mixed phase and wavelength coded optical code division multiple access system: Apparatus and system for transmitting and receiving optical code division multiple access data over an optical network. The apparatus comprises a spectral phase decoder for decoding the encoded optical signal to produce a decoded signal, a time gate for temporally extracting a user signal from the decoded signal, and a... Agent: Telcordia Technologies, Inc.

20080107429 - Spectrally phase encoded optical code division multiple access system: System and method for transmitting and receiving encoded signals over a network along with one or more additional signals transported within a spectral gap created by the coded signals.... Agent: Telcordia Technologies, Inc.

20080107431 - Method and apparatus for controlling wavelength tuning of optical source for optical communication: A method and apparatus for controlling a wavelength tuning of an optical source in an optical communication system. An operating temperature of an optical source is controlled and monitored to shorten a wavelength tuning time of the optical source generated in an optical source generator. When the current operating temperature... Agent: Rabin & Berdo, Pc

20080101795 - Data signal amplitude and cross-point detectors in an optical modulator control system: According to embodiments of the present invention, an optical modulator control apparatus receives a data signal and determines amplitude and cross-point of the data signal using a full wave detector. The apparatus sums the negative and positive halves of the data signal to determine the amplitude and differences the negative... Agent: Blakely Sokoloff Taylor & Zafman

20080101796 - Bidirectional optical module: A bidirectional optical module having a light-emitting device 1 for emitting transmitting signal light therefrom, an optical fiber 8 which the transmitting signal light emitted from the light-emitting device is made to enter, a light-receiving device 9 which receiving signal light made to emerge from the optical fiber is made... Agent: Kratz, Quintos & Hanson, LLP

20080101793 - Network address association recovery: Techniques for reestablishing network address associations upon recovery of a passive optical network (PON) disablement rely on storage address association information. A network node stores address association information in non-volatile memory upon detecting a network disablement. Upon recovery of the PON from the disablement, the network node associates network addresses... Agent: Shumaker & Sieffert, P. A.

20080101794 - Testing of transmitters for communication links by software simulation of reference channel and/or reference receiver: A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter under test and the resulting optical output is... Agent: Fenwick & West LLP

20080101797 - Method and receiver to increase the spectral efficiency of dpsk modulation format: The optical DPSK demodulator converts phase into amplitude variations by delaying one path of an interferometer by one bit period. This operation includes a differentiation of the transmitted signal, which must be counteracted by applying a precoder at the TX side. By variation of the delay within the interferometer the... Agent: Sughrue Mion, PLLC

20080101798 - Communication by radio waves and optical waveguides: The invention relates to improvements to full-duplex bi-directional opto-electrical transducers, primarily for use in radio-over-fiber installations, such as remote-antenna installations for cellular radio apparatus. The transducer is of the kind based on an electroabsorption modulator, and the first improvement consists in biasing it by means of a constant-current source rather... Agent: Corning Incorporated

20080101799 - Polarization mode dispersion monitoring and fault correlation: A method and apparatus for a monitoring technique for the rate of change of polarization state and of the polarization mode dispersion is proposed. This technique is used for performance monitoring and fault correlation as well as for the verification of commitments to customers with respect to the transmission system's... Agent: Patterson & Sheridan, LLP/ Lucent Technologies, Inc

20080101800 - Dipole induced transparency drop-filter cavity-waveguide system: A normally opaque waveguide interacting with a drop-filter cavity can be switched to a transparent state when the drop filter is also coupled to a dipole. This dipole induced transparency may be obtained even when the vacuum Rabi frequency of the dipole is much less than the cavity decay rate.... Agent: Morrison Ulman Nupat, LLC

20080101801 - Small form pluggable analog optical transmitter: A pluggable small form factor optical transmitter is described. The optical transmitter can be plugged into an optical transmission unit which may hold many optical transmitters. The optical transmitter includes an analog laser for QAM transmissions, a TEC driver, pre-distortion circuitry, a microprocessor, and an automatic power control circuit and... Agent: Motorola, Inc. Law Department

20080101802 - Receiving apparatus and electronic device using the same: A photodiode receives an infrared signal transmitted from a transmitter. A current distributing unit outputs a detection current Id output from the photodiode as a first detection current Id1 and a second detection current Id2 to a subsequent first current-to-voltage conversion amplifier and a subsequent second current-to-voltage conversion amplifier respectively.... Agent: Cantor Colburn, LLP

20080101803 - High dynamic range optical receiver: An optical receiver having a photodetector, amplifier, feedback loop, and output circuit is disclosed. The photodetector generates a current between first and second nodes in response to being illuminated with light. The amplifier has an input connected to the first node and an output connected to a third node. The... Agent: Kathy Manke Avago Technologies Limited