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Optical communications July category listing 07/06

20060165410 - Arrangement for avoiding node isolation in all-optical communication networks: An arrangement in a node in an optical communication network has one or more terminals 220 and/or 222 configured to provide local access to the network through the node, and an all-optical routing arrangement 202-204-206-208 configured to route optical signals among optical pathways extending from the node. The optical pathways...

20060165411 - Method for determining the network load in a transparent optical transmission system: Disclosed is a transparent optical transmission system comprising a plurality of network nodes that are interconnected via optical transmission links. Several optical connection paths in said transparent optical transmission system are established, maintained and disconnected from a first optical network node to a second optical network load by means of...

20060165413 - Dwdm catv return system with up-converters to prevent fiber crosstalk: A hybrid fiber cable network includes multiple nodes, each of which receives a first multi-carrier return signal from multiple customers with carrier signals in a first frequency band. In a fiber-hub, one or more first multi-carrier signals are converted into a second multi-carrier signal with carrier signals in a second...

20060165412 - Self-healing passive optical network: Disclosed is a self-healing passive optical network comprising: a station, such as a central office, for outputting first and second multiplexed downstream optical signals to first and second feeder fibers; a remote node connected to the central office through the first and second feeder fibers to demultiplex each input multiplexed...

20060165414 - 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 a relatively higher volume of aggregate traffic than other nodes. The optimization can eliminate low rate links and supporting network equipment. The...

20060165415 - Communication cable: To provide the communication cable that enables to replace the communication media with an optical signal and increase the communication speed, while assuring the compatibility with the already-widespread telecommunication method. A communication cable used for connecting a plurality of electronic appliances, as well as for conducting communication of information with...

20060165416 - Wireless infrared network transceiver and methods and systems for operating same: A digital data network (100) uses network nodes (106) incorporating infrared transceivers (108). Each node (106) includes a plurality of infrared transceivers (108) having transmitter (109) and receiver (111) optics designed to facilitate line-of-sight infrared optical communications in a residential or business neighborhood. New nodes (106) are installed with at...

20060165417 - Optical transceivers with closed-loop digital diagnostics: Systems and methods for performing closed-loop diagnostics in optical transceiver. The TOSA of an optical receiver includes a primary transmit module and a secondary receiver module. The transmit module transmits a data signal to a ROSA of another optical transceiver. The ROSA has a secondary transmit module that can transmit...

20060165418 - Optical signal switching network using method of sub-harmonic embedded clock transmission: An optical signal switching network having a transmitter and a receiver, wherein the transmitter includes a data generator for generating a data signal and a clock signal having the same frequency as the data signal; a clock attenuator for attenuating a frequency of clock signal generated in the data generator...

20060165419 - Apparatus for multilevel optical recording: An improvement to an optical recording apparatus is provided for adapting the apparatus for an optical recording format using multiple modulation levels. The improvement includes an electro-optic modulator (EOM) added between a light source and a first modulator, to regulate a power of the light beam supplied to the first...

20060159450 - Method for pre-emphasis of optical signals in a transmission system comprising add-drop-modules: A method for pre-emphasising transmitted signals in channels for multiplex signals along a transmission path comprising supply and/or branch points is provided. According to the method, relative degradations of the signal-to-noise intervals between transmitted signals via any category or group of channels—i.e. express and add or drop channels or add-drop...

20060159451 - Signal-quality evaluation device, signal adjustment method, optical-signal evaluation system, and optical transmission system: Provided are a signal-quality evaluation device and a signal adjustment method which require shorter evaluation time and which have high flexibility of application. A signal quality evaluation device 100 includes an optical component 110 and an optical output detector 120. In the optical component 110, an output optical power Pout...

20060159452 - Polarization resolving heterodyne optical receiver: The polarization of the lightwave at the input to a heterodyne receiver can be determined by measurements of the amplitude of electrical signals without the need for phase measurements. This allows more accurate measurements of the polarization in the presence of noise and allows a determination of the degree of...

20060159453 - Optical path re-arrangement method for optical communication method: When an optical path arrangement is re-arranged, the packet loss amount is reduced by judging whether to perform the shift in one stage or whether to perform the shift in two stages in accordance with the state of the network. This is implemented by an optical communication network comprising a...

20060159455 - Method and system for interconnecting end systems over an optical network: Methods and systems for using a wavelength as an address in an optical network are disclosed. In particular, methods for selecting a wavelength for a particular node in an optical network, resolving a wavelength for a destination node in an optical network from a network address, and receiving and transmitting...

20060159454 - Use of polarization for differentiation of information: The present invention discloses a system for signalling within optical or combined optical/electronic networks wherein a first transmission node executes polarization multiplexing on transmitted traffic, and at one or more intermediate nodes one or more of the following processes are carried out on the sent traffic: demultiplexing by polarization and/or...

20060159456 - System and method for conserving resources in an optical storage area network: A method for providing a storage area network includes receiving, at a data storage node, data from a number of storage area network (SAN) servers via associated local nodes coupled to a optical network. The data is received at a plurality of transmitting wavelengths, where each local node is assigned...

20060159457 - System and method for communicating optical signals between a data service provider and subscribers: An optical fiber network can include an outdoor laser transceiver node that can be positioned in close proximity to the subscribers of an optical fiber network. The outdoor laser transceiver node does not require active cooling and heating devices that control the temperature surrounding the laser transceiver node. The laser...

20060159458 - Optical time division multiplexing transmitter: The optical time division multiplexer generates a time-division-multiplexed optical signal by time-division-multiplexing optical signals of a plurality of channels, the carrier-wave phases of which are shifted with respect to one another. The circulator guides the multiplexed optical signals split by the optical splitter to the optical interference device and the...

20060159459 - Method for carrying out infrared data transmission: A method is described for infrared data transmission between several transmitter units (S1 to S4) and a common receiver station (2), with the individual transmitter units (S1 to S4) transmitting the data to be transmitted in a blockwise manner to the receiver station (2) in a time interval with respect...

20060159461 - Optical transceiver module end of life indication: An optoelectronic device that uses microcode to perform an end of life calculation for a laser in the optoelectronic device is disclosed. In particular, the optoelectronic device senses environmental and operational parameters under changing conditions during device operation. The optoelectronic device then calculates the end of life for the laser...

20060159460 - Programmable loss of signal detect hardware and method: A loss of signal assert and de-assert level programming mechanism in an optical transceiver coupled to a host computing system. A control module is connected to the host so as to receive the programmable loss of signal level. A post-amplifier detects when the receive power drops below a loss of...

20060159462 - Transmitter preemphasis in fiber optic links: This disclosure is generally concerned with optical transceivers. In one example, an optical transceiver implements electronic dispersion compensation in the receive path, as well as optical preemphasis on the transmitted signal in order to improve aspects of optical performance on multimode fiber links, relative to systems that do not implement...

20060159463 - Optical waveform measuring apparatus and optical waveform measuring method: The present invention relates an optical waveform measuring apparatus designed to eliminate the polarization dependency of an intensity correlation signal without a polarization diversity arrangement. The apparatus comprises a sampling light outputting unit for outputting a sampling light pulse to sample light under measurement, a sampling result outputting unit for...

20060159464 - Method and apparatus for in-service monitoring of a regional undersea optical transmission system using cotdr: A method and apparatus is provided for obtaining status information concerning an optical transmission path. The method begins by generating a COTDR probe signal having a prescribed wavelength and transmitting optical traffic signals and the COTDR probe signal over an optical transmission path having a length corresponding to those used...

20060159465 - Single sideband optical transmitter: Described are an optical transmitter and a method for generating a single sideband optical signal. The method includes generating a data signal at a first power level and at a second power level with a predetermined ratio being defined between the power levels. The data signal at the first power...

20060159466 - Offset quadrature phase-shift-keying method and optical transmitter using the same: Disclosed is an optical transmitter using an offset quadrature phase-shift-keying (OQPSK) method. The method includes: a first phase modulator for outputting a first signal beam generated by phase-modulating an input beam based on a first data; a second phase modulator for outputting a second signal beam generated by phase-modulating the...

20060153562 - Automatic detection and resolution of fiber cabling errors in optical networks: A method of automatically detecting fiber cabling errors in an optical network is described. Fiber connectivity between optical nodes in the network, including initial cabling and any subsequent cabling changes or cabling errors, is detected. The connectivity information including initial link connectivity and changes relating to new fiber connectivity is...

20060153563 - Delivering multicast services on a wavelength division multiplexed network using a configurable four-port wavelength selective crossbar switch: A method and a system in which selected wavelengths of a wavelength division multiplexed (WDM) signal are modulated with multicast data for multicasting data services on an optical network. The WDM signal is received from a hub node of the optical network, such as a unidirectional ring network or a...

20060153564 - Bandwidth allocation method and system for data transmission in epon: A method for efficiently allocating a bandwidth at an optical line terminal (OLT) for upstream transmission in an Ethernet passive optical network (EPON) system. An optical network unit (ONU) divides data to be transmitted into at least two groups that include a group with a constant bit rate (CBR) and...

20060153565 - Hybrid passive optical network: A hybrid passive optical network (PON) includes a central office (CO) for multiplexing at least one downstream optical signal for broadcasting and a plurality of downstream optical signals for communication. The PON further includes a remote node (RN) connected to the CO using at least one feeder fiber (FF), and...

20060153566 - Methods and apparatuses to provide a wavelength-division-multiplexing passive optical network with asymmetric data rates: Various methods, systems, and apparatuses are described in which a wavelength-division-multiplexing passive-optical-network includes a wavelength-locked light source and a wavelength-specific light source. The wavelength-locked light source may be used for communications in a first direction in the wavelength division multiplexed passive optical network to supply data signals at a first...

20060153567 - Wavelength-division multiplexing-passive optical network: Disclosed is a wavelength-division multiplexing-passive optical network having a central office including a plurality of first working and protection transmit/receive modules, working and protection optical transmitters, and a plurality of first optical switches, the first working and protection transmit/receive modules generating downstream optical signals and detecting upstream optical signals having...

20060153568 - 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 light receiving unit body, at least a photoelectric conversion device and a...

20060153570 - Compensation for temperature and voltage effects when monitoring parameters in a transceiver module: A method for calibrating the calculation of a laser power measurement with respect to specified operational and/or environmental parameters in an optoelectronic device, such as an optical transceiver module having a laser diode, is disclosed. In particular, the method includes sensing analog data that relates to light emission from the...

20060153569 - Transceiver boot loader: A method for dynamically updating an optical transceiver (or optical transmitter or optical receiver) that has at least one processor and persistent memory that includes one or more write-protected memory locations. The write-protected memory locations of the persistent memory includes loader microcode that, when executed by the at least one...

20060153571 - Information support system: A battery-less terminal (1) has means (21) for photoelectrically converting an optical signal from an information transmission device (2), means (12) for outputting the electric signal generated by the photoelectric conversion means (21) as sound, means (13) for reflecting infrared light for position emitted by a position detection device (3),...

20060153572 - Methods and apparatus for optical wireless communication: Methods and apparatus for optical wireless communication. In one embodiment, a wireless optical video system in which video content (e.g., DVI or HDMI) is transmitted wirelessly between a digital video source and a display device. This wireless optical communication is accomplished using a laser, encoded with the digital video data,...

20060153574 - Fiber optical system for pmd mitigation by polarization scrambling: A fiber optical system (10) for transmitting an optical signal comprises an optical fiber line (1) with a plurality of successively arranged polarization scramblers (6a to 6c) for polarization modulation of the optical signal transmitted through the optical fiber line (1) and a reference frequency signal (11) which synchronizes scrambling...

20060153573 - Quantum optical transmission device and quantum optical generator device therefor: A squeezed light generating method using the Kerr effect of an optical fiber is relatively easy, but the requirements in manufacture such that a beam must be divided accurately at 50:50 are large. In addition, it is desirable that the squeezed light can be generated with arbitrary wavelength and pulse...

20060153575 - Receiver for pmd mitigation by polarization scrambling: A receiver (10) for an optical signal containing a time jitter and a time-varying distortion caused by a periodic polarization scrambled signal comprises at least one decision gate (11) and a clock recovery module (13) providing a clock signal (C) recovered from the optical signal to the at least one...

20060153576 - Compensation of polarization mode dispersion in single mode fiber for maximum-likelihood sequence estimation: An output signal of a single mode fiber (SMF) is spectrally shaped to achieve characteristics of a predefined channel “target” response. The target response is that of a partial-response, maximum-likelihood channel with additive white Gaussian noise. A receiver employs a maximum-likelihood sequence estimation (MLSE) detector having its detection algorithm, such...

20060153577 - Receiver for a differential phase modulated signal: The receiver features a first splitter which divides a differential phase modulated signal into three signal components from which at least two signal components are routed via timers. The first timer has a delay of a half period of the carrier signal and thereby serves in a conventional way for...

20060147203 - Optical network element with remote access capability: An Optical Network Terminal (ONT) for a Passive Optical Network (PON) system comprises a Diagnostic Interface Support Functions (DISF) module and a PON Interface Support Functions (PISF) module connected to the DISF module. The PISF module is configured for receiving a remotely-issued diagnostic request transmitted for reception by the PISF...

20060147204 - Multicast transfer route setting method, and multicast label switching method for implementing former method: A method of establishing a multicast transfer route is disclosed that can reduce the cost of entire route under a constraint on delay incurred between starting point and ending points. The method includes the steps of: computing the shortest route with respect to delay connecting the starting point and the...

20060147205 - Method and apparatus for a supervisory channel in a wdm fiber-optic communication system: A method and apparatus for providing a supervisory channel in a wavelength division multiplexing (WDM) fiber-optic communication system uses a controlled optical attenuator disposed in an optical path between a demultiplexer (DMUX) and a multiplexer (MUX) of an Optical Add-Drop Multiplexer (OADM....

20060147206 - Multi switching architecture and method in optical burst switching network: An optical burst switching network is provided that includes an edge node transmitting burst data including a plurality of packets; and a core node optically switching received burst data or converting the received burst data into an electric signal and electrically switching the converted burst data....

20060147208 - System and method for slot deflection routing at optical router/switch: The present invention provides a system and method for slot deflection routing of optical data packets. The method of the present invention includes the steps of establishing a schedule pattern that includes a plurality of time slots. The schedule pattern includes at least one time slot in which an ingress...

20060147207 - System and method of time-slotted optical burst switching: A time-slotted optical burst switching system and method therefor can support data transmissions for a constant bit rate (CBR) and at a variable bit rate (VBR) and improves a data transmission method at an edge node and a core node. Accordingly, it is possible to perform a data service for...

20060147209 - System and method for protecting traffic in a hubbed optical ring network: An optical access network includes a first ring and a second ring communicating optical signals in opposite directions. The network also includes an access node coupled to both rings that adds traffic in a first wavelength of a first optical signal communicated on the first ring. Furthermore, the network includes...

20060147210 - Wavelength-division-multiplexed passive optical network: A broadband light source includes: at least two semiconductor optical active devices for generating TE polarized lights of different wavelength bands; an optical coupler for dividing each of the TE polarized lights input from each of the semiconductor optical active devices into two TE polarized lights, and outputting the two...

20060147211 - Wavelength-division-multiplexed passive optical network: A wavelength division multiplexing passive optical network including optical lines for link is disclosed. The passive optical network includes a plurality of optical network units each of which generates an upstream optical signal; a central office for generating downstream optical signals to be provided to each of the optical network...

20060147212 - Optical filter, an optical interleaver and associated methods of manufacture: The optical filter (1) receives a dense wavelength division multiplexed signal (2) as an input. The filter (1) is adapted to output a single channel (3) of less than 1 nm bandwidth. The filter (1) has a plurality of cavities (4) which are each optically connected to an adjacent cavity...

20060147213 - Dynamic control of planck radiation in photonic crystals: A band gap discontinuity is propagated across a Photonic Crystal (PC) to capture thermal energy in a region near the primary emission wavelength of the Planck spectral distribution and transfer that energy to a different spectral region where it is emitted. To extend the range of frequency shifting beyond the...

20060147216 - Background consistency checking in an optical transceiver: A method that enables an optical transceiver (or optical transmitter or optical receiver) to perform consistency checking such as Cyclic Redundancy Checking (CRC) in the background while the transceiver is in operation. The optical transceiver includes a system memory and a consistency checker component. The optical transceiver determines that consistency...

20060147215 - Host printed circuit board with multiple optical transceivers: An optical transceiver host computing system (hereinafter simply referred as the “host”) printed circuit board has multiple optical transceivers directly mounted to it. Each optical transceiver is configured to convert an electrical signal into an optical signal and to transmit the optical signal and to receive an optical signal and...

20060147214 - Optically connecting computer components: A central component of a processor based system, the central component including a processor and an optical interface to transmit data encoded as an optical signal to an optical interface of an external component of the processor based system, and to receive data encoded as an optical signal from the...

20060147217 - Self-testing optical transceiver controller using internalized loopbacks: An operational optical transceiver microcontroller configured to initiate a self-test using internalized loop backs. The microcontroller includes a memory, at least one processor and a number of input and output terminals. The output terminals are coupled to internally corresponding input terminals by a configurable switch. The memory receives microcode that,...

20060147218 - Optical receiver: A receiver for a differentially phase shift keying formatted optical signal, such as an RZ-DPSK formatted optical signal. Dither control loops are provided for controlling path length in a demodulator and/or for controlling the center wavelength of an optical band pass filter. A feedback loop is provided for controlling the...

20060147219 - Optical communication system using optical frequency code, optical transmission device and optical reception device thereof, and reflection type optical communication device: The invention dispenses with calibration of the optical frequency of the light source and permits the use of many codes without increasing the transmission bandwidth used. Let the optical frequency width of the light source be represented by FSR and the code length of every code be represented by FSR,...