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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 8135279 | OFDM direct detection using a balanced receiver A receiver for demodulating optical OFDM signals may detect an optical OFDM signal that includes a carrier and data subcarriers by optically splitting the carrier from the subcarriers using a frequency selective filter and then recombining the carrier and the subcar... | 03/13/2012 |
| 7574135 | Method, apparatus and system for high-speed transmission on fiber optic channel Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and co... | 08/11/2009 |
| 7493045 | Real time fiber optic matrix switch interconnection A real time fiber optic matrix switch includes at least one matrix switch port and a controller card. The controller card is configured to recognize communication protocols associated with any of the Type A-H and J signals of the Naval Tactical Data System (NTDS), a... | 02/17/2009 |
| 7437073 | System for providing dynamic service using optical sub-carrier multiplexing type multi-channel access and method of controlling the same Disclosed herein is a system for providing dynamic service using optical sub-carrier multiplexing type multi-channel access and method of controlling the same. The system includes a plurality of optical sub-carrier multiplexing modems, an optical gigabit-Ethernet sw... | 10/14/2008 |
| 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 |
| 7425696 | Photoelectric oscillator A photoelectric oscillator includes a laser beam projection unit; an optical modulator on an optical path extending from the projection unit, which optical modulator outputs a modulated signal or an optical signal containing a harmonic of the modulated signal and in... | 09/16/2008 |
| 7421204 | Method and system for increasing the spectral efficiency of binary coded digital signals A method and system for increasing the spectral efficiency of binary coded signals includes encoding an input binary bit sequence such that the input binary bit sequence is converted into a series of rectangular pulses having varying repetition rates. A continuous w... | 09/02/2008 |
| 7421203 | Method for transmitting packet in wireless access network based on wavelength identification code scheme A method for transmitting a packet in a wireless access network based on a wavelength identification code scheme. The method comprises the steps of connecting n number of RNCs (Radio Network Controllers) to one sub-ring where the “n” is a positive integer, and a... | 09/02/2008 |
| 7412169 | FTTH system for convergence of broadcasting and communication through switched broadcasting A fiber to the home FTTH network for convergence of broadcasting and communication is disclosed. The network includes: an OLT for receiving and converting a first predetermined number of broadcast signals and an Ethernet signal into a plurality of converted optical ... | 08/12/2008 |
| 7406261 | Unified multi-carrier framework for multiple-access technologies A wireless communication system transmits data on multiple carriers simultaneously to provide frequency diversity. Orthogonality is provided by carrier interference, which causes a narrow pulse in the time domain corresponding to each transmitted data symbol. Select... | 07/29/2008 |
| 7394985 | Wavelength access server (WAS) architecture A wavelength access server (WAS) architecture provides aggregation of traffic streams of diverse data communication protocols as well as provision of wavelength resources in an optical transport network. The WAS provides functions such as service traffic adaptation,... | 07/01/2008 |
| 7386236 | Multiple wavelength TDMA optical network A passive optical network which employs multiple wavelengths to increase overall system bandwidth, with each wavelength being shared by multiple optical network units (ONUs) according to a time division multiple access (TDMA) protocol. The upstream TDMA traffic ther... | 06/10/2008 |
| 7379669 | Method and apparatus for duplex communication in hybrid fiber-radio systems An apparatus and method for enabling cost-effective duplex communication by diplexing one of down stream signals for frequency up-conversion in a hybrid fiber-radio system includes diplexing an unmodulated mode signal among beating signals between a master laser and... | 05/27/2008 |
| 7373084 | Optical network termination device for use in passive optical network based on WDM/SCM scheme A termination device for use in a WDM-SCM PON system can effectively support a multi-channel integration function of a WDM/SCM PON system. The termination device contained in a termination end of a WDM/SCM (Wavelength Division Multiplexing/Sub-Carrier Multiplexing) ... | 05/13/2008 |
| 7369771 | Optical network terminator and optical network connection method using it An optical network terminator of the present invention includes an optical wavelength division multiplexer for receiving an optical signal and incoherent light. An optical detection unit converts a downstream high speed and low speed optical signals into electrical ... | 05/06/2008 |
| 7366417 | 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... | 04/29/2008 |
| 7362719 | Method and apparatus for cross-talk cancellation in frequency division multiplexed transmission systems A method and apparatus are disclosed for canceling cross-talk in a frequency-division multiplexed communication system. The disclosed frequency-division multiplexed communication system employs multiple carriers having overlapping channels and provides an improved c... | 04/22/2008 |
| 7340183 | Optical communications systems, devices, and methods A method of transmitting an optical communications signal, comprising receiving a first signal, encoding the signal with a differential or duobinary encoding scheme, encoding the signal with an oscillating signal component, and sub-carrier modulating the signal onto... | 03/04/2008 |
| 7339955 | TDMA communication method and apparatus using cyclic spreading codes Systems and methods of ultra-wideband communication are provided. In one embodiment, an ultra-wideband communication system divides a stream of data conveying symbols into a plurality of unspread substreams. A common spreading code is generated at the ultra-wideband... | 03/04/2008 |
| 7340176 | Metropolitan area type optical telecommunications network comprising a ring type core An optical telecommunications network (1000), of metropolitan area type, having a ring type core (10), and secondary rings (41, 42; 43, 44). In each sending access node (11), transmitters (111) for sending information-carrying opti... | 03/04/2008 |
| 7330657 | Method to demultiplex wavelengths of light An apparatus and method for demultiplexing multiple wavelengths of light. In one embodiment, an optical signal having a plurality of wavelengths is provided to an optical-to-electrical (OE) circuit configured to convert optical signals into electrical signals. The o... | 02/12/2008 |
| 7330656 | Passive optical network employing code division multiple access A PON and a method of transmitting data employing different upstream and downstream transmission protocols are disclosed. The PON includes: a plurality of ONTs; WDM filters; an OLT receiving and transmitting optical signals to and from the ONTs and a higher network;... | 02/12/2008 |
| 7330655 | WDM/SCM-PON and media access control method for asymmetric packet communication in the same The present invention relates to a WDM/SCM-PON and a media access control method for asymmetric packet communication in the same. In the WDM/SCM-PON, each SCM channel is classified and used as a link by adopting an SCM technique of subdividing a wavelength band of u... | 02/12/2008 |
| 7324753 | Optical communication network using a code division multiplexing method The present invention is a high-speed and low-cost optical communication network. A preferred embodiment of this optical communication network comprises an accommodation device, optical couplers that are connected to corresponding ports of this accommodation device,... | 01/29/2008 |
| 7321730 | Method and apparatus for the transmission fault detection in an access network An optical network unit (ONU) interconnected by passive optical network (PON) equipment to an optical line terminal (OLT) is identified using secondary modulation of the optical carrier to impress an identifier of the ONU onto the carrier. This resolves a recurring ... | 01/22/2008 |
| 7321733 | Split-band optical transmission system and optical transmission method used therein An optical transmission system including an optical transmitting device and an optical receiving device. The optical transmitting device includes a data signal splitting section for splitting data signal information into at least two parts and generating at least tw... | 01/22/2008 |
| 7317720 | Signal transmission system A signal transmission system has a master node and plural slave nodes performing data transmission with the master node. The master node has a serial-to-parallel converter for converting a serial data signal from each slave node into a parallel data signal. Each sla... | 01/08/2008 |
| 7292747 | Strictly non-blocking switch core having optimized switching architecture based on reciprocity conditions A switch core is set forth that comprises a plurality of duplex switches that are interconnected with a interconnection fabric to implement, for example, strictly non-blocking operation of the switch core for reciprocal traffic. In one embodiment, an N-way reciproca... | 11/06/2007 |
| 7272327 | Multi-detector detection of optical signals Use in an optical communications system of multiple detectors to separately detect respective multiple spectral modes of a received optical signal. The invention also provides for corresponding multi-channel, dispersion-tolerant optical receivers. Embodiments are pr... | 09/18/2007 |
| RE39785 | System for optically transmitting frequency-division-multiplexed signal and transmitter therefor In an optical transmission system, a multiplexer frequency-division-multiplexes a plurality of signals, and outputs the resultant signal to an FM modulator. The FM modulator converts the frequency-division-multiplexed signal into an FM modulated signal through frequ... | 08/21/2007 |
| 7256877 | System and method for rapidly achieving optimum dispersion in optical transmission systems A system and method for optimizing dispersion in an optical transmission line is provided. The system and method comprise measuring the amplitude of a d.c. voltage component of a synchronously demodulated data signal of at least one wavelength channel by an in-phase... | 08/14/2007 |
| 7254330 | Single fiber passive optical network wavelength division multiplex overlay A single fiber passive optical network (PON) wavelength division multiplex (WDM) overlay includes a central office, a fiber optic network, and a plurality of optical network termination (ONT) units. The central office has a baseline optical link that receives a base... | 08/07/2007 |
| 7236701 | Optical transmission system for performing communication using a plurality of communication lines The present invention provides a low-cost optical transmission system using a plurality of subscriber lines which is capable of efficiently utilizing an optical transmission path. A communication status observing section 116 in a transmitting device 1 ... | 06/26/2007 |
| 7228077 | Channel gain control for an optical communications system utilizing frequency division multiplexing Attenuation caused by dispersion in an optical fiber communications system is compensated. A number of low-speed channels is to be transmitted across an optical fiber. Each low-speed channel is allocated a different frequency band for transmission. The attenuation c... | 06/05/2007 |
| 7224861 | Strictly non-blocking switch core having optimized switching architecture based on reciprocity conditions A switch core is set forth that comprises a plurality of duplex switches that are interconnected with a interconnection fabric to implement, for example, strictly non-blocking operation of the switch core for reciprocal traffic. In one embodiment, an N-way reciproca... | 05/29/2007 |
| 7209660 | Optical communications using heterodyne detection An optical communications system includes a receiver subsystem with at least two heterodyne receivers. The receiver subsystem receives a composite optical signal having two or more subbands of information and corresponding tones. An optical splitter splits the compo... | 04/24/2007 |
| 7190897 | Optical channel operating parameters monitoring In a communication system, channel operating parameter carrier frequencies are located in the vicinity of data nulls in a data spectrum. The operating parameter carriers are summed with the data signal. At the receiver, the operating parameter carrier frequencies ar... | 03/13/2007 |
| 7181141 | Method and system for collecting network topology in an optical communications network An exemplary embodiment of the invention is a network element in an optical communications network. The network element includes a data collection application program interface (API) for receiving a request from a client for network topology information along with a... | 02/20/2007 |
| 7158584 | Method, apparatus and system for high-speed transmission on fiber optic channel Multi-carrier modulation fiber optic systems constructed using a series of electrical carriers, modulating the data on the electrical carriers and combining the carriers to form a wideband signal. The wideband signal can then be intensity modulated on a laser and co... | 01/02/2007 |
| 7151896 | Burst optical communication apparatus First and second carrier modulators each modulate a carrier having a different frequency from each other with a baseband input signal. First and second variable wavelength optical modulators each convert the modulated signal into an optical signal having a first or ... | 12/19/2006 |
