Optical communications inventions 04/06

20060088317 - Mirror controller for optical switch: A mirror controller of an optical switch comprises a signal generator (10, 82, 83) for passing the optical signal on the same light path as the one for optical communication using the optical switch, and an image analyzer (15, 16, 81) detecting the optical signal as the light scattered by...

20060088318 - Method and arrangement for determining signal degradations in the presence of signal distortions: The invention relates to a method and several arrangements for determining signal degradations of an optical signal transmitted in a transmission signal in the presence of signal distortions, wherein at least one part of the optical signal is fed to an adaptive optimal or electric filter at a place of...

20060088319 - Thermally-floating transmitter wavelength grid of signal channels in a wdm transmission system: A method and apparatus is provided for tracking a thermally floating wavelength signal channel grid generated at an optical transmitter (Tx) in an optical transmission system or optical network where the wavelengths of the individual Tx signal channels may move in wavelength due to, for example, changes in ambient temperature...

20060088320 - Catadioptric projection optical system, exposure apparatus having the same, device fabrication method: A catadioptric optical system comprising a first imaging optical system including a concave mirror and forming an intermediate image of a first object, said first imaging optical system forming a reciprocating optical system that an incidence light and reflected light pass, a second imaging optical system for forming an image...

20060088321 - Closed loop rz-dpsk alignment for optical communications: A method and system are provided for using a power spectral density of an output of a modulator to facilitate closed loop feedback for controlling alignment of a pulse with respect to information formed upon the pulse....

20060088322 - Optical transmitter device: An optical transmitter device capable of high-speed shutdown of optical output. A bias controller generates a low-frequency signal, extracts the frequency component of a low-frequency signal from an electrical signal fed back thereto, and compares the phase of the frequency component of the low-frequency signal generated thereby with that of...

20060083511 - Network tap module: A network tap module having a network line monitoring function has a signal splitter to split a signal received from a network into a first copy which is returned to the network and a second copy. A line monitoring and statistics circuit receives the second copy of the signal and...

20060083510 - Spherical aberration detection: The invention relates to an optical device in which a spherical aberration is detected. The optical device comprises means (206, 208) for focussing a first radiation beam (203) having a first numerical aperture and a second radiation beam (204) having a second numerical aperture lower than the first numerical aperture,...

20060083512 - Wireless signal distribution system and method: A communications system connects one or more BTS hotels with several remote access nodes on a transmission ring. Each operator has one or more separate optical wavelengths. Signal flow around the ring can either be uni-directional or bi-directional. Each optical wavelength (or wavelength pair) contains the wireless signal traffic for...

20060083513 - System and apparatus for a carrier class wdm pon providing trunk protection with increased fiber utilization, distance and bandwidth: A Passive Optical Network (PON) is provided with trunk protection by employing Wavelength Division Multiplexer (WDM) elements in combination with optical couplers at distribution nodes (DN) intermediate a pair of Local Exchange Office Nodes and a customer node. The Local Exchange Office Nodes (LEON) transmitting and receiving signals on an...

20060083514 - Bi-directional oadm module and solution for the optical access network: The invention discloses a bidirectional OADM device, comprising a main body, on which a first fiber ferrule, a first filter, a Lens, a second filter, a second fiber ferrule arranged along a transverse optical axis of the device, and a Laser and a Pin-TIA vertical to the transverse optical axis,...

20060083515 - Wdm-pon having optical source of self-injection locked fabry-perot laser diode: A wavelength division multiplexed-passive optical network includes an optical line terminal for generating downstream optical signals of discrete wavelengths and for receiving upstream optical signals of discrete wavelengths, a remote node, coupled to the optical line terminal, a wavelength division unit settled to reflect a predetermined wavelength, and a plurality...

20060083516 - Optical signal receiver and optical space transmission system: An optical signal receiver comprising an opto-electric converter for converting an optical signal transmitted from a remotely opposed transmitter into an electric signal, a reproduction circuit for reproducing a data signal from an output of the opto-electric converter, a fixed signal generation circuit for generating a fixed signal having a...

20060083517 - Optical sub-assembly having a thermo-electric cooler and an optical transceiver using the optical sub-assembly: The present invention relates to an optical transceiver that installs an optical transmitting assembly and an optical receiving assembly both are compact, inexpensive, and capable of operating at a high speed. The optical transmitting assembly of the present invention provides the metal bottom that installs the thermoelectric cooler thereon and...

20060083518 - Fiber optic connection for digital displays: A digital graphics connection such as a DVI connection uses an optical fiber for transmissions representing a clock signal and parallel pixel data channels. In one embodiment, a DVI cable includes a source-side connector containing active circuitry such as a multiplexer that interleaves pixel data and clock information and a...

20060083519 - Chirped rz-ami optical transmitter: A chirped RZ-AMI optical transmitter includes a first logic gate for receiving a first signal obtained by pre-coding binary data and a second signal having a waveform obtained by inverting and delaying the first signal, and outputting a third signal obtained by logically operating on the first and second signals....

20060083520 - 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...

20060078332 - Optical fiber protection switch: An optical fiber protection switch comprises an optical interface and an optical switching system. The optical interface exchanges optical signals with optical fibers that are deployed in a ring configuration. The optical switching system exchanges the optical signals with the optical interface. The optical switching system performs ring switching of...

20060078333 - Protocol speed increasing device: A routing table generating unit that generates a routing table describing a next hop to which a packet is to be sent according to a destination address of the packet that is input via an input channel, including a ternary content addressable memory (TCAM); an external memory; a unit that...

20060078334 - Protection switching arrangement for an optical switching system: A protection arrangement for an optical switching system includes protection switching for switch planes in the optical core and for ports in the tributary cards. For a multiple layer switch core protection is also provided between layers. A first layer is for switching optical channels. The protection switches used may...

20060078335 - Wireless communication device with infrared transducer: A wireless communication device is provided having an infrared transducer integrated on certain components. If the wireless communication device has an external antenna, the infrared transducer may be positioned at the tip of the antenna; if the wireless communication device has a clam-shell construction, the infrared transducer may be positioned...

20060078336 - Optical dispersion compesnation in the electrical domain in an optical communications system: Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic dispersion. The communications signal is then modulated in the electrical domain using the compensation function. In...

20060078337 - Optical waveform for use in a dwdm optical network and systems for generating and processing same: An optical signal occupying one or more wavelengths. An optical data signal on each wavelength is modulated with a respective overhead (dither) signal, resulting in a respective dithered optical signal. The amplitude of a particular overhead signal used to modulate the corresponding optical data signal is chosen so that the...

20060078338 - Thermal chirp compensation systems for a chirp managed directly modulated laser (cml™) data link: A fiber optic communication system for receiving an electronic digital data signal and transmitting the same, comprising an optical signal source adapted to receive the digital data signal and to produce a frequency modulated optical signal from a directly modulated semiconductor laser; an optical spectrum reshaper adapted to convert the...

20060078339 - System and method for reducing interferometric distortion and relative intensity noise in directly modulated fiber optic links: A laser transmitter with a feedback control loop for minimizing noise. The novel laser transmitter includes a laser, an external reflector adapted to form an extended cavity to the laser, and a feedback control loop adapted to detect noise in the laser and in accordance therewith, adjust the optical phase...

20060078340 - Optical communication device: An optical communication device enabling confirmation of frames flowing through a communication line without affecting such line. The optical communication device includes a first conversion unit that converts a first optical signal transmitting a first frame group including a first maintenance frame into a first electrical signal; a frame duplication...

20060072918 - Optical add/drop multiplexer with reconfigurable add wavelength selective switch: A reconfigurable WDM add/drop multiplexer and its method of operation at an add/drop node on an optical fiber carrying a plurality of WDM signals is described. The WDM add/drop multiplexer has a coupler and a demultiplexer element dropping WDM signals from the optical fiber to a plurality of drop terminals,...

20060072919 - Infra red networking system and method: A system and device for wireless communication and networking featuring a chipset with Infrared transmitting and receiving capabilities especially for in airplanes including and integrated infrared chip (INchip), a driver, a user device, a communication box and an infrared transceiver....

20060072920 - Contactless connector: A contactless connector that secures communication continuity is provided. The contactless connector comprises a rotation-side light element disposed on a rotating body that rotates about a rotational axis and a fixed-side light element disposed on a fixed body in a position facing the rotation-side light element, and which sends and...

20060072921 - Optical transmission system for frequency-multiplexed signal: A detector outputs a detection signal indicating amplitude variation of an input frequency-multiplexed signal. An amplitude controller adjusts the amplitude of the frequency-multiplexed signal by referring to the detection signal. A modulator modulates the amplitude-adjusted frequency-multiplexed signal to produce a predetermined modulated signal. A second multiplexer multiplexes the modulated signal...

20060072922 - Method for polarization-based intrusion monitoring in fiberoptic links: A fiber optic communication system including a fiber optic link, a transmitter system and a receiver system. The transmitter system includes a laser source producing a light beam, and a polarization controller receiving the light beam and providing an expected pattern of changing states of polarization to the light beam...

20060072923 - Optical transmission switching device: Disclosed are the multiplex communication system and the method therefore. A fault detection part of a duplex switching device detects it as generation of fault when recognizable signals are not detected from a connected line within a prescribed time. When the fault detection part detects the generation of fault in...

20060072924 - Duo-binary optical transmitter tolerant to chromatic dispersion: A duo-binary optical transmitter tolerant to a chromatic dispersion includes a pre-coder for generating a first 2-level signal from input binary data and generating a second signal having a waveform obtained by inverting the first signal, a Mach-Zehnder Modulator (MZM) for generating a Differential Phase Shift Keying (DPSK) modulated optical...

20060072925 - Circuit arrangement for electrically isolated transmission of an electrical signal with an optocoupler: A circuit arrangement for electrically isolated transmission of an electrical signal with an optocoupler comprising a converter circuit which converts the electrical signal into a pulse width-modulated signal and delivers this signal to an optocoupler; a logic circuit which generates a completion signal when the conversion into the pulse width-modulated...

20060072926 - Optical signal receiver, and method for controlling identification point for binarization processing performed thereby: A method for controlling an identification point for binarization processing in an optical signal receiver which can diminish a code error rate by optimally tracking an identification point at all times in accordance with a received signal, thereby maintaining transmission quality high. The method comprises identification point electrical signal increment/decrement...

20060072927 - Optical receiver for receiving differential phase and frequency shift-keyed optical signals: An optical signal receiver for receiving a differential modulated optical signal is disclosed. The optical signal receiver includes a delay interferometer for intensity-dividing the optical signal into a first and a second divided optical signal, generating a delayed optical signal by phase-delaying the second divided optical signal by one bit...