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| Number | Title | Issue Date |
| 8064779 | Receiving apparatus A receiving apparatus which suppresses threshold-voltage changes. A peak voltage detection block detects the peak voltage of a signal. A bottom voltage detection block detects the bottom voltage of the signal. A stop control block generates a stop signal for stoppin... | 11/22/2011 |
| 8059968 | Modulation device for generating optical signal with quadruple frequency and method thereof The present invention discloses a modulation device for generating an optical signal with quadruple frequency and the modulation method thereof. The modulation device in the present invention utilizes a commercial integrated modulator, a RF signal generator and a ph... | 11/15/2011 |
| 7471895 | Method and apparatus for obtaining status information concerning optical amplifiers located along an undersea optical transmission line using COTDR A method is provided for locating a fault in one or more optical amplifiers operating in saturation and located along an optical transmission path. The method begins by generating a coherent optical time domain reflectometry (COTDR) trace representing a backscattere... | 12/30/2008 |
| 7460784 | Method for preemphasising an optical multiplex signal The invention relates to a method for easily and rapidly preemphasizing an optical multiplex signal transmitted by an emitter to a receiver consisting wherein signal-to-noise ratios are equalized by means of simple measurement or new adjustment of signal power on th... | 12/02/2008 |
| 7457549 | Sub signal modulation apparatus, sub signal demodulation apparatus, and sub signal modulation demodulation system A sub signal modulation apparatus, with the intention of stabilized transmission of a sub signal superimposed on main signal light irrespective of the intensity of the main signal light when used in a general-purpose main signal transmitter, including a sub signal o... | 11/25/2008 |
| 7457537 | Optical telecommunication system with automatic channel switching An optical telecommunication system with automatic channel switching is disclosed. The system is provided with two symmetrical fiber channels and two subsystems. Each subsystem is formed by two 2×2 optical switches that are connected to each end of the primary and ... | 11/25/2008 |
| 7457539 | 2×2 optical switch A 2×2 optical switch routs each light signal received from input ports to selected output. The optical switch has an adjustable light signal steering element, a fixed light signal steering element, and a steering element actuator. The adjustable light signal steeri... | 11/25/2008 |
| 7454138 | Method for optimizing path of optical network, and optical transmission node for realizing path optimization Span information (information about conditions of a path between a node of interest and another, adjacent node connected thereto) retained in respective nodes is cumulatively transmitted from a add-drop node, which is to become a starting-point node of a certain wav... | 11/18/2008 |
| 7454142 | Data transmission method and data transmission apparatus A data transmission method and apparatus is disclosed by which bidirectional transmission of a plurality of optical signals obtained by conversion of a plurality of serial digital data can be achieved efficiently using a single common optical signal transmission cab... | 11/18/2008 |
| 7450860 | Apparatus and method for frequency-shift-keying optical transmission An optical transmission apparatus employing an FSK scheme is disclosed. The optical transmission apparatus includes a light generator arranged to generate a first tone signal having a first frequency and a second tone signal having a second frequency. The optical tr... | 11/11/2008 |
| 7450863 | Optical receiver for wavelength-division-multiplexed signals A WDM receiver that includes a single, delay interferometer coupled to an N-channel wavelength-demultiplexing filter provides for the simultaneous conversion of a multiplex of N differential-phase-shift-keyed modulated optical signals of different wavelengths into N... | 11/11/2008 |
| 7450854 | High-speed wireless LAN system A high-speed wireless LAN system is disclosed. The system includes a mobile station for transmitting/receiving data encrypted by a predetermined encryption method, communicating the data to associated access points by an ultra wide-band (UWB) communication method, a... | 11/11/2008 |
| 7450844 | WDM optical transmission equipment with redundant configuration, and wavelength control method of light output in standby system WDM optical tranmsmission equipment with redundant configuration includes a plurality of tranmitters. Each tranmitter includes active and standby panels including active and standby optical transmission circuits respectively having active and standby attenuators for... | 11/11/2008 |
| 7450849 | Wavelength-division multiplexing passive optical network A wavelength-division multiplexing passive optical network (WDM-PON) comprising a central office for generating monitor light and multiplexed downstream optical signals to be out and detecting upstream optical signals, the central office including a signal monitorin... | 11/11/2008 |
| 7447436 | Optical communications using multiplexed single sideband transmission and heterodyne detection A transmitter subsystem generates an optical signal which contains multiple subbands of information. The subbands have different polarizations. For example, in one approach, two or more optical transmitters generate optical signals which have different polarizations... | 11/04/2008 |
| 7447439 | Optical duplexer and optical triplexer An optical triplexer design is described in which external optical signals at a first wavelength range propagate through a laser source. The laser source provides optical signals having a second wavelength range. The triplexer features a photodetector for providing ... | 11/04/2008 |
| 7444082 | Polarisation mode dispersion compensator using a mean square error technique A method for the adaptive adjustment of a PMD compensator in optical fiber communication systems comprises the steps of taking the signal at the compensator output and extracting the components y1(t) and y2(t) on the two orthogonal polarization... | 10/28/2008 |
| 7444080 | IrDA/RC transmitter circuit having low energy consumption An IrDA module is coupled to a tapped inductor and makes both IrDA and remote control (RC) transmissions. The IrDA module includes a transmitter LED and a field effect transistor (FET) switch. The inductor has a first lead, a second lead and a tap. The first lead is... | 10/28/2008 |
| 7444078 | Transient control solution for optical networks An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver amplifier, an OADM module, and a transmitter amplifier. Once the OADM node... | 10/28/2008 |
| 7440700 | Apparatus for testing performance of optical transceiver Provided is an apparatus for testing the performance of an optical transceiver by referencing various performance clocks provided by an OTU2 signal connection transceiver and an STM-64/OC-192 signal. The apparatus for testing performance of an optical transceiver in... | 10/21/2008 |
| 7437074 | Wavelength division multiplexing transmission system A WDM transmission system is provided which can multiplex/demultiplex and transmit wavelength division multiplexing signals, where signal lights have a different signal bandwidth, in a status without much deterioration of transmission quality. In the WDM transmissio... | 10/14/2008 |
| 7437084 | Infrared radiation receiving circuit, electronic device, and infrared radiation receiving method A receiving circuit stops a one shot timer from generating an output signal immediately after the output signal is outputted to an external entity until a predetermined stretch time elapses. With this arrangement, the receiving circuit will not generate a new output... | 10/14/2008 |
| 7433594 | Node apparatus, optical wavelength division multiplexing network, and system switching method An optical wavelength division multiplexing network has a multi-level structure where a plurality of optical network units (ONUs) are connected to a lowest-level network. A node apparatus connected to networks other than the lowest-level network includes (a) passive... | 10/07/2008 |
| 7428385 | Ethernet PON using time division multiplexing to converge broadcasting/video with data An Ethernet passive optical network provides a subscriber with a high speed and large capacity data service and a real time digital broadcast/video service. The network includes an optical line terminal for frame-multiplexing broadcast/video signals, which are obtai... | 09/23/2008 |
| 7428384 | Optical router According the invention, a multiplexed light composed of a signal light of a signal wavelength, and a first route control light of a first route control wavelength different from the signal wavelength or a second route control light of a second route control wavelen... | 09/23/2008 |
| 7421199 | System and method for subcarrier modulation as supervisory channel An apparatus and method for processing a supervisory signal for optical network applications. The apparatus includes a subcarrier transmission system configured to receive a first supervisory signal and output a second supervisory signal, and an electrical-to-optica... | 09/02/2008 |
| 7418206 | Control method of wavelength dispersion compensator, and wavelength dispersion compensator It is an object of the present invention to provide a control technique for reducing wavelength dependence of wavelength dispersion values and also for suppressing a change in wavelength transmission characteristic with a temperature variation or the like, in a VIPA... | 08/26/2008 |
| 7415205 | Wavelength division multiplexed self-healing passive optical network using wavelength injection method A wavelength division multiplexed self-healing passive optical network using a wavelength injection method includes a central office for coupling modulated multiplexed optical signals (MMOS) and broadband optical signals (BOS)for an upstream light source into one si... | 08/19/2008 |
| 7412173 | Apparatus for generating optical carrier suppressed return-to-zero An apparatus for generating a Carrier-Suppressed Return-to-Zero (CS-RZ) signal is disclosed. The apparatus includes a mixer, a Low Pass Filter (LPF), a driver amplifier and a single external modulator. The mixer generates a modulator input by mixing data with a half... | 08/12/2008 |
| 7397018 | Amplitude and phase controlled adaptive optics system An adaptive optics system is provided. The system includes a light source, a pair of deformable mirrors and a detection module. The light source is configured to provide an outgoing beam. The outgoing beam has an amplitude and a phase. The first deformable mirror is... | 07/08/2008 |
| 7394996 | Burst mode optical receiver and system and method therefor A communications system includes an optical receiver for receiving optical signals and for converting the optical signals into electrical signals, a transimpedance amplifier (“TIA”) for filtering the electrical signals, a limiting amplifier coupled with the TIA,... | 07/01/2008 |
| 7394994 | Optical receiver circuit An optical receiver circuit comprising an optical converter circuit (38), comprising a photodiode and converting optical power into electrical power, a sensor circuit for deriving a control voltage VCONTR as a characteristic value of the electrical power outp... | 07/01/2008 |
| 7391978 | Optical signal transmitter and optical signal transmission system The invention provides an optical signal transmitter low in noise and in distortion and provides an optical signal transmission system using this optical signal transmitter. The optical signal transmitter includes a plurality of frequency modulation means for... | 06/24/2008 |
| 7389053 | Tunable filtering of RF or microwave signals based on optical filtering in Mach-Zehnder configuration Devices and techniques for achieving signal filtering in RF or microwave frequencies by optical filtering using two separate optical paths. Each optical path may include one or more optical resonators to achieve desired optical filtering. ... | 06/17/2008 |
| 7389052 | Calibration method for station orientation In optical wireless networks, light beams are transmitted over-the-air and maximum performance is achieved when light beams are aligned with corresponding light detectors. A feedback control system is created between transmitting and receiving units, wherein the rec... | 06/17/2008 |
| 7389049 | Chromatic dispersion compensation controlling system The dispersion monitoring device of the present invention detects a change in dispersion caused in a system by performing the decision process of a received signal using a data flip-flop in which required decision phase and decision threshold are set, averaging the ... | 06/17/2008 |
| 7389045 | Apparatus and method for monitoring and compensating an optical signal Optical communication apparatuses and optical communication methods are provided. According to one aspect, an optical communication apparatus includes a communication path configured to communicate a first signal; a signal generator configured to provide a second si... | 06/17/2008 |
| 7385706 | Method and apparatus for determining the nonlinear properties of devices and fibers A method and apparatus are provided for measuring samples of the electric field of light propagated through a device under test and determining a nonlinear property of the device, such as self-phase modulation or cross phase modulation, using the measured samples. | 06/10/2008 |
| 7382982 | Ethernet passive optical network for integrating broadcast and communication based on time division multiplexing scheme An Ethernet-PON integrates broadcast/communication through time division multiplexing, which provides users with high-speed, high-volume communication data and high-quality, real-time digital broadcast/image data. An OLT performs a switching operation on a plurality... | 06/03/2008 |
| 7376360 | Optical device for extracting a sideband signal from a composite signal including orthogonally modulated signals An optical device extracts an information bearing sideband such as an FSK or SCM signal (label) from a composite signal that includes the sideband and an orthogonally modulated signal such as an intensity modulated signal (payload) by employing polarization beam spl... | 05/20/2008 |
