Optical communications inventions 08/06

20060193631 - Inter-module communications of an optical network element: Inter-module communications of an optical network element are described herein. In one embodiment, an exemplary optical network element includes multiple functional modules arranged in multiple shelves and multiple management modules for coordinating the functional modules. Each of the management modules corresponds to each of the shelves respectively. Each of the...

20060193632 - Methods and apparatus for optimizing utilization in a ring network: Techniques are disclosed for generating a hitless migration plan to optimal state, given an optimal routing and wavelength assignment for demands. For example, a technique for use in performing a circuit transition in accordance with an optical ring-based network comprises the following steps/operations. First, a first (e.g., initial) circuit layout...

20060193633 - Optical division multiplexing transmission and reception method and optical division multiplexing transmission and reception device: An object of the present invention is to implement optical multiplexing transmission and reception in which an OCDM channel is added without changing the used wavelength bandwidth of the existing WDM channel or without changing the time slot allocated to the existing OTDM channel. Hence, one of the embodiments of...

20060193634 - Method for wireless optical transmission of data and wireless optical data transmission system: The invention relates to a wireless optical data transmission system and a method for wireless optical transmission of data. The system comprises a data stream generator for generating at least two parallel data streams (18.1, 18.2, 18.3). The parallel data streams are transmitted by a number of separate optical transmitting...

20060193635 - System for selectively combining satellite signals sent to a user through an optical fiber: A method and apparatus are provided for transferring a plurality of satellite signals through an optical communication network. The method includes the steps of selecting a frequency of a local oscillator signal within a guardband between a left polarization signal and a right polarization signal of a first satellite signal...

20060193636 - Laser oscillator, optical communication method and system: Extremely advanced technology for scrambling an optical signal based on quantum mechanical fluctuation is used to provide a highly reliable optical communication method which can invalidate illicit activities such as wire-tapping, a system, and a laser oscillator which is used in the method and system. A transmitter side generates laser...

20060193637 - Device and method for adjusting chromatic dispersion: A device and method for adjusting the chromatic dispersion in an optical transmission system includes an optical element having a temperature-dependent chromatic dispersion. The device and method further include a device for adjusting a temperature or a temperature distribution of at least one region of the optical element for providing...

20060193638 - Wavelength dispersion compensation design method and a system thereof: The present invention discloses a design method of wavelength dispersion compensation of a desired link that is extracted from an optical network, the link including two or more spans, and two or more nodes (N1, N4) that are equipped with an add/drop function, as shown in FIG. 2. All residual...

20060193639 - Method and apparatus for demodulation of optical differential phase shift keyed signals: Method and apparatus for demodulating one or more channels of an optical differential phase shift keyed (DPSK) signal with a symbol rate of SR using an athermal optical delay interferometer with a free spectral range (FSR) of 50 GHz/2N, and (0.8×SR)<FSR<(1.3×SR), where N=0, 1, 2 . . . ....

20060193640 - Optical signal reception device: An optical signal reception device is disclosed that receives and demodulates an optical signal modulated by DQPSK and performs logical inversion and other controls to transit to the object reception state. The signal reception device includes a front end including a delay interferometer and an opto-electric conversion element that receive...

20060188251 - Optical channel intelligently shared protection ring: An optical ring network has one or more working wavelengths and multiple protection wavelengths adapted to support the working wavelength(s). Routing tables may be used in network nodes to assign traffic of a failed working wavelength to a protection wavelength. The protection technique may be applied to networks employing, for...

20060188252 - Method for determiming a link path and a corresponding unoccupied wavelength channel: A method for determining a link path and an unoccupied wavelength channel on the optical transmission links of said link path, for setting up a connection by means of at least one first and second network nodes within a transparent optical transmission system is provided. According to one embodiment of...

20060188253 - Method for switching transmission route, and optical transmission device: A method for switching a transmission route in an optical network. A regenerator station extracts a main signal, and detects the input level of the main signal. When the input level falls below a threshold, the regenerator station determines that a failure occurs, and stops output of a main signal...

20060188254 - Communication link for communicating data: A communication link for communicating data between a first opto-electronic equipment capable of providing an optical signal and a second opto-electronic equipment capable of receiving the optical signal is described. The communication link comprises includes a first optical channel and a second channel. The first optical channel is preferably a...

20060188255 - Monitoring wavelength dispersion variation using photon absorption: Monitoring wavelength dispersion variation of an optical signal includes receiving the optical signal at a detector. The optical signal comprises photons of different spectrum components. The photons are received at a material of the detector. The material is operable to produce a reaction in response to the arrival of a...

20060188256 - Matrix time division multiplex (mtdm) interrogation: Embodiments of present system encompass: a plurality of laser sources that produce a plurality of respectively different optical wavelengths; a matrix switch having a plurality of inputs operatively coupled to the plurality of laser sources, each of the plurality of inputs receiving a respective optical wavelength; and the matrix switch...

20060188257 - Method for transmitting data in synchronous ethernet passive optical network: Transmitting data in a synchronous Ethernet passive optical network employs a synchronous Ethernet for ensuring QoS during transmission of multi-media data, thereby specifying transmission of synchronous data and asynchronous data, respectively. The Ethernet passive optical network has an optical line terminal, which is a central base station, and a plurality...

20060188258 - Method and system for time-sharing transmission frequencies in an optical network: An optical communication system includes an optical ring, a hub node, and a plurality of local nodes. The hub node and the plurality of local nodes are coupled to the optical ring. The hub node is capable of receiving traffic over the optical ring from the plurality of local nodes...

20060188259 - Hdsl optical fiber transmission system and method: A method and system for a telecommunications isolator link using optical fibers that will work for whichever of HDSL 1, or 4 or HDSL 2 is being used. A feature of the link is that identical circuits can be used at each end of the link....

20060188260 - Robust service delivery node and method therefor: In an optical network some optical nodes are fitted with optical switches. The optical switches support the optical coupling and decoupling of the optical nodes and the remainder of the optical network. Electrical power supply failures to a node result in the node being optically decoupled from the remainder of...

20060188261 - Repeating radio frequency transmission system for extending the effective operational range of an infrared remote control system: Inventive systems and methods for remotely controlling infrared controlled devices by using addressed radio frequency control signals. Radio frequency signals propagate through most obstructions to infrared control signals. Augmenting each control signal with an address allows for great selectivity in an environment with several transmitters and receivers....

20060188262 - Optical transmission system: An optical transmission system is provided which is capable of booting the system by using an ASE (Amplified Spontaneous Emission) light in a manner to provide high quality. A pre-amplifier receives noise light and does gain setting in an amplifier booting mode and receives an optical signal and to amplify...

20060188263 - System and method for dispersion compensation in an optical communication system: An optical communication system includes a first end terminal comprising a first transponder operable to receive a first electrical signal and generate an optical signal based at least in part on the first electrical signal for communication to a multiple span communication link. The optical signal experiences at least partial...

20060188264 - Polarization diversity for optical fiber applications: At least two light beams with polarization diversity are generated that each carry a representation of the same information. Separate optic fibers carry each of the at least two beams through a region subject to vibration to a remote location where the information is recovered by an optical receiver based...

20060188265 - Modular system for an optical rear panel bus: The invention relates to a rear panel bus, with a number of plugs which may be plugged into the modules and a fibre optic cable, for guiding light signals, whereby the fibre optic cable has a number of interruptions in the propagation direction of the light signals, into which means,...

20060188266 - Optical network terminal with wide input range power converter: The disclosure describes an optical network terminal (ONT) for use in a passive optical network (PON) that includes power conversion circuitry to accommodate a variety of power source options. In particular, the power conversion circuitry converts a wide range of input direct current (DC) voltages to a DC supply voltage...

20060188267 - System and method for suppression of stimulated brillouin scattering in optical transmission communications: An optical transmitter includes a light source and an SBS suppression circuit coupled to the light source. The light source is operable to generate an optical signal having one or more wavelengths. The optical signal has a signal spectrum having an upper band limit and a lower band limit. The...

20060188268 - Optical drive for controlling output power of a pick-up head using apc loop: An optical drive includes a comparator for comparing a first input signal with a second input signal to generate a first output signal at a first node; a signal source coupled to a second node, the signal source outputting a second output signal; and a switch for outputting a third...

20060188269 - Apparatus and method for detecting beam power in optical drive: An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit that selects a gain, amplifies the beam...

20060182439 - Method of using cable test to modify teaming failover algorithm: A method of using cable test to modify teaming failover algorithm is disclosed. In accordance with one embodiment, a method of causing team member failover based on channel characteristics of a channel in an information handling system includes testing the channel of at least one of the team members in...

20060182440 - Fault isolation of individual switch modules using robust switch architecture: A robust nonblocking switch architecture is presented, in the first and final stages made of switch modules which have extra, unallocated, input and output ports beyond those necessary to render the switch architecture nonblocking. Each middle stage has an extra switch module, affording it spare unallocated ports as well. A...

20060182441 - Method and apparatus of monitoring and controlling the emission wavelengths of a plurality of laser sources integrated on the same chip or in the same photonic integrated circuit (pic): A method and apparatus operates an array of laser sources as an integrated array on a single substrate or as integrated in an optical transmitter photonic integrated circuit (TxPIC) maintaining the emission wavelengths of such integrated laser sources at their targeted emission wavelengths or at least to more approximate their...

20060182442 - Optical module and electronic device: An optical module that is attachable to one end of an optical transmission medium achieves optical communications through the optical transmission medium. The optical module includes an optical element that transmits or receives an optical signal, and an optical block that is disposed in a transmission path of the optical...

20060182443 - Optical packet exchanger: An optical packet exchanger is provided which, in a situation where a transmission path for an optical packet is to be switched by using an address signal, prevents the transmittable capacity for the information signal from being decreased, and which facilitates the extraction of the address signal even if the...

20060182444 - Controlling proportional allocation transmission in an epon through an olt scheduling algorithm: Disclosed is a method, apparatus and computer product for controlling proportional allocation transmission through an OLT scheduling algorithm in an EPON based FTTH system. The method includes computing a total transmission capacity for Optical Network Terminations (ONTs) connected to the OLT, computing a number of transmissions according to the ONTs,...

20060182446 - Integrated wired and wireless wdm pon apparatus using mode-locked light source: Integrated wired and wireless wavelength division multiplexing passive optical network (WDM PON) apparatus using a light source mode-locked to fed incoherent light includes: a fed light generator for providing fed light for up/downstream signals via a broadband light source emitting an incoherent optical signal; a central office (CO) for receiving,...

20060182447 - Optical communications system: An optical communication system comprises a base station, a plurality of trunk optical fibers connected to the base station, a plurality of star couplers connected to the trunk optical fibers, a plurality of remote stations, and a plurality of branch optical fibers. The branch optical fibers have first branch cut...

20060182445 - Wavelength division multiplexed passive optical network system using light source wavelength-locked by injected incoherent light: Disclosed is a wavelength-division-multiplexed passive optical network (WDM-PON) using a light source wavelength-locked by an injected incoherent light. The WDM-PON system includes: an injection light generating section, which includes a broadband light source emitting an incoherent optical signal, so as to provide a route for an uplink signal and a...

20060182448 - Apparatus and method for free space optical communications beam steering without gimbals: A beam steering apparatus and method for free space optical transceivers is disclosed. The beam steering function is performed internally by way of translating an internal optical fiber in the focal plane of the transceiver telescope using miniature micro-electro-mechanical systems (MEMS). The optical design of the transceiver provides a wide...

20060182449 - Optical transmitter with integrated amplifier and pre-distortion circuit: An optical transmitter including a housing containing an electrical input disposed in said housing for receiving an information signal; an amplifier for electronically amplifying the input signal; and a laser connected to the output of the amplifier for generating a modulated light beam corresponding to the information signal that is...

20060177219 - Link system for photonic cross connect and transmission apparatus: Between photonic cross connects (PXCs) 3 and 4, an in-use system path passing through transmission apparatus (WDMs) 5 and 7 are set, and a backup system passing through transmission apparatus (WDMs) 6 and 8 is set. The WDMs 3 and 4 link to the PXCs 5 and 7 and release...

20060177220 - Performance monitoring for optical links: A method for estimating at least one optical link parameter using a Viterbi equalizer (1) generating averaged values (M) of signal amplitudes of a distorted optical signal transmitted through an optical link (2) for a set of decided bit patterns (a, b, c, d, . . . ), the method...

20060177221 - Transmitter and method for transmitting messages on an optical fiber: For transmitting information on an optical fiber, a plurality of information carrier channels at different carrier frequencies and a plurality of filling channels are used. The filling channels are transmitted together with the information carrier channels along the fiber. The total optical power of the information carrier channels and the...

20060177222 - Wavelength selective optical power measurement: The present invention relates to an apparatus and to a method of wavelength selective optical power measurement, comprising the steps of selecting a plurality of at least partly different spectral parts of the optical signal under test in a cascaded way, directing the selected parts onto a corresponding number of...

20060177223 - Wavelength division multiplexing-passive optical network: A passive optical network includes a central office generating multiplexed downstream optical signals, a plurality of subscriber units provided with the downstream optical signals of the corresponding wavelengths, and a remote node for relaying signals between the subscriber units and the central office. The central office comprises a broadband light...

20060177224 - Optical add/drop multiplexer: A high performance method of performing an optical add/drop multiplexer function that is ideally suited for integration into a photonic integrated circuit (PIC)....

20060177225 - Sideband filtering of directly modulated lasers with feedback loops in optical networks: In a WDM optical network DML signals are sideband filtered to compensate for chirp with a feedback loop carrying signals from a monitor unit which helps maintain the sideband filter offset from a peak output of the DMLs. Network components with filtering characteristics, such as AWGs, can be used as...

20060177226 - Global network computers: This invention generally relates to one or more computer networks having computers like personal computers or network servers with microprocessors linked by broadband transmission means and having hardware, software, firmware, and other means such that at least one parallel processing operation occurs that involve at least two computers in the...

20060177227 - Retractable string interface for stationary and portable devices: An interface for a small form factor electronic device by enabling explicit measurement of extension or retraction of a retractable cord by monitoring the amount of string that passes by sensors, as the string exits the enclosure of the device. Input to such small form factor devices may be provided...

20060177228 - Impedance matching broadband optical receiver circuit: An impedance matching broadband optical receiver circuit including an input terminal adapted to receive an input information bearing signal, extending over a broad input frequency band, and a plurality of output terminals operative to provide, in response to receipt of the input information bearing signal, respective outputs in generally non-overlapping...

20060177229 - Regenerating an optical data signal: The receive power of an optical data signal is converted into an electrical data signal by a photodiode. The electrical data signal is then amplified and supplied to a scanning circuit. The receive power (useful signal and noise) is measured in a measurement and control device and the adjustable scanning...

20060171711 - Method and apparatus for testing optical networks: An instrument for measuring bidirectional optical signals propagating in an optical transmission path between elements one of which will not transmit if continuity of the transmission path is not maintained, for example a branch path between a central offices optical line terminal (OLT) and an end-user's optical network terminal (ONT),...

20060171712 - Information processing system, calculation node, and control method of information processing system: The present invention provides an information processing system, comprising a plurality of calculation nodes with an optical transmitter, which individually outputs a plurality of optical signals each having a different wavelength, and an optical receiver, which individually receives a plurality of optical signals each having a different wavelength, an optical...

20060171713 - Optical channel assigning system and method of assigning data to optical channels in optical network: An optical channel assigning system in an optical network including a source node, a destination node, and a network controller for controlling transmission of data through a plurality of optical channels that connect the source node and the destination node to each other and a method of assigning data to...

20060171714 - Electrically shared passive optical network: An optical line terminal (OLT) includes a media access controller (MAC) that has a transmit bus coupled to several optical transceivers by one or more electrical splitters. Each optical transceiver is coupled, in the normal manner, to a passive optical network (PON). All PONs that are coupled to the MAC...

20060171715 - Optical network system and transmission apparatus: An optical network system is disclosed by which flexible wavelength path setting can be performed in accordance with tree-shaped and star-shaped network topology. A central node includes a multiplexing section for multiplexing optical signals transmitted from user nodes and inputted thereto, and a central node side branching section for branching...

20060171716 - Multi-channel all-optical signal processor: An all-optical processor and method for simultaneous 2R regeneration of the multiple wavelength-division-multiplexed (WDM) channels comprising: a nonlinear medium, wherein the nonlinear medium comprises one or more highly-nonlinear fiber (HNLF) sections adapted to receive multiple WDM channels from the input, and wherein further the HNLF sections are separated by one...

20060171717 - Optical add-drop multiplexer, and optical network equipment using the same: Add switches 105-1 through 105-N and drop switches 103-1 through 103-N for optical signals corresponding to each wavelength in an optical add-drop multiplexer 100 are made controllable independently of one another. Add switches and drop switches of the active-side and backup-side optical add-drop multiplexers are switched by optical switch control...

20060171718 - Optical receiver and optical reception method compatible with differential quadrature phase shift keying: In an optical receiver according to the present invention, an input signal light subjected to the differential quadrature phase shift keying (DQPSK) is incident on a PANDA type fiber in a linearly polarized state by 45°, so that a delay time difference corresponding to one symbol is generated between orthogonal...

20060171719 - Optical transmission system having optimized filter wavelength offsets: An optical transmission system having optical transmit and receive filters having passbands adjusted or selected for opposite and equal wavelength offsets from the optical wavelength of a carrier or the channel center wavelength....

20060171720 - Optical receiver apparatus and method: A method and apparatus for receiving narrowband filtered optical PSK signals, including converting PSK optical signals into intensity-modulated signals at a receiver, and introducing a desired amplitude imbalance between the first and the second intensity-modulated signals to improve receiver performance....

20060171721 - Label remover and label swapper using the same: A label remover, and the method using the same, renders photoelectric conversion becomes unnecessary and improves using conditions and transmission quality. The label remover includes: (a) an oscillator for outputting a driving signal having a third frequency f3; (b) a double-sided band converter for (i) receiving an optical signal modulated...

20060171723 - Method for modulating an optical signal and optical transmitter: A method for modulating an optical signal includes the following steps: modulating the intensity of the optical signal with a nonreturn-to-zero bit signal, and modulating the phase of the optical signal with a periodic phase-shift signal creating an alternating π-phase shift every second, third or more consecutive bit. An optical...

20060171722 - Multi-wavelength optical cdma with differential encoding and bipolar differential detection: The present invention relates generally to an optical CDMA transmission system and method employing differential optical encoding and bipolar decoding. Differential encoding and bipolar decoding may be performed at the bit level, wherein differential phase encoding and decoding occurs on an entire composite signal. Differential encoding and bipolar decoding may...