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| Number | Title | Issue Date |
| 8184978 | Method and device for channel-adapted signal transmission in optical networks A method for optical data transmission in a wavelength multiplexing system having at least two transmission channels of different wavelengths includes determining at least one value which is a measure of a physical property of an optical data transmission path of th... | 05/22/2012 |
| 8155524 | Method and apparatus for transmitting multiple channels in a wavelength division multiplexed (WDM) optical communication system with reduced raman crosstalk and nonlinear distortions An improved method and apparatus is provided for transmitting a WDM optical signal. The method begins by modulating optical channels that are each located at a different wavelength from one another with (1) a respective one of a plurality of information-bearing elec... | 04/10/2012 |
| 8111992 | Amplified wavelength broadband video distribution architectures Provided herein are embodiments of a device, method of use and system for a low-cost analog multi-wavelength video distribution transamplifier for CATV and FTTH networks having a broadband overlay. The transamplifier embodiments described herein allow the use of mul... | 02/07/2012 |
| 8107816 | Wavelength division multiplexing module A telecommunications module includes an optical wavelength division multiplexer/demultiplexer configured to demultiplex a first optical signal input into the telecommunications module into a plurality of different wavelengths, a fiber optic splitter configured to sp... | 01/31/2012 |
| 8086106 | WDM optical transmission system and controlling method thereof In the WDM optical transmission system, when performing a correction of a control target value of the total light intensity per one channel of the WDM light in each node on a transmission path, a correction value calculation section of each node determines the type ... | 12/27/2011 |
| 8086105 | Wavelength division multiplexer/demultiplexer having flat wavelength response Provided is a wavelength division multiplexer/demultiplexer having a flat wavelength response. In the wavelength division multiplexer/demultiplexer, a modified taper-shaped optical waveguide is interposed between an input waveguide and a first slab waveguide, such t... | 12/27/2011 |
| 8068734 | Mapping a client signal into transport frames Embodiments of the present invention provide a systems, devices, and methods in which a client signal is divided into a plurality of channels, mapped within transport frames, and combined into a WDM transport signal. These embodiments include intra-nodal redundancy ... | 11/29/2011 |
| 8068735 | 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... | 11/29/2011 |
| 8041218 | Setting up a circuit in a network In particular embodiments, setting up a circuit in a network includes establishing by control plane logic that planning pre-conditions for planning a circuit have been satisfied, and initiating the planning of the circuit. The control plane logic establishes that re... | 10/18/2011 |
| 8036533 | Optical transmitter/receiver module An optical element mounting substrate where a plurality of light emitting elements have been mounted on the same plane, a lens array for collimating a plurality of light emitted from the plurality of light emitting elements, and a wavelength multiplexing/demultiplex... | 10/11/2011 |
| 8032026 | Optical transmission apparatus, optical interface device, and optical transmission method When an XFP is plugged into an optical interface unit by live-line plugging, an external bias voltage higher than an internal bias voltage is kept applied to a CDR incorporated in the optical interface unit until the XFP starts up. This prevents exertion of a negati... | 10/04/2011 |
| 8027587 | Integrated optic vector-matrix multiplier A vector-matrix multiplier is disclosed which uses N different wavelengths of light that are modulated with amplitudes representing elements of an N×1 vector and combined to form an input wavelength-division multiplexed (WDM) light stream. The input WDM light strea... | 09/27/2011 |
| 8000603 | WDM systems and methods A WDM optical system includes first and second WDM's including an optical link therebetween. Each WDM includes circuitry for linking multiplexer and demultiplexer circuitry to a plurality of modular elements. The modular elements include a first set of modules for c... | 08/16/2011 |
| 7995921 | Banded semiconductor optical amplifiers and waveblockers Embodiments of the present invention provide an array of semiconductor optical amplifiers, within a photonic integrated circuit (hereinafter, “PIC”), that apply a gain to one or more optical bands within a WDM signal. According to various embodiments of the inve... | 08/09/2011 |
| 7970280 | 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 w... | 06/28/2011 |
| 7965940 | Transparent fiber channel link management for protocol transport Methods and apparatus for providing distance extension and other transport functions such as error monitoring, provisioning, and link/service management in a fiber channel path are disclosed. According to one aspect of the present invention, a transport node include... | 06/21/2011 |
| 7945164 | Multiple fiber optic gigabit ethernet links channelized over single optical link A method, an apparatus, and a system where multiple lower bandwidth optic Ethernet (e.g. 1000Base-FX) signals can be interleaved or encoded onto a single fiber optic link by overclocking the physical layer elements in such a manner as to be transparent to the data l... | 05/17/2011 |
| 7917033 | Wavelength-multiplexing optical transmission system and wavelength-multiplexing optical transmission method A wavelength-multiplexing optical transmission apparatus includes an optical-wavelength-information storing unit that stores optical wavelength information on an optical wavelength of an optical signal to be output from a transponder, and an optical-wavelength-infor... | 03/29/2011 |
| 7903974 | Optical transmission system for transmitting signal of E-band with other bands Disclosed is an optical transmission system capable of transmitting optical signals of E-band and other bands through one optical fiber. The system includes a first thin film filter for receiving optical signals of E-band and other bands at both sides thereof respec... | 03/08/2011 |
| 7869712 | Method and apparatus for increasing transmission capacity in optical transport network Provided are a method and apparatus for increasing transmission capacity for large-capacity high-speed signal transmission in an optical transport network (OTN). A method and apparatus for increasing transmission capacity are needed, which can transmit a large-capac... | 01/11/2011 |
| 7869711 | Optical tunable asymmetric interleaver and upgrade for dense wavelength division multiplexed networks A tunable asymmetric interleaver constructed from two symmetric interleavers in series, wherein either or both of the individual symmetric interleavers exhibit a wavelength shifting ability. Advantageously, tunable asymmetric interleavers so constructed provide cont... | 01/11/2011 |
| 7844181 | Simple fibre channel speed negotiation across transport A method for negotiating speed between a Fiber Channel (FC) local client and a remote FC client across a DWDM network is provided. A transmission speed of the local FC client at a local ingress transport interface is detected. The data from the local FC client is fo... | 11/30/2010 |
| 7826746 | 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... | 11/02/2010 |
| 7809270 | Remodulating channel selectors for WDM optical communication systems The present invention provides a remodulating channel selector for a wavelength division multiplexed optical communication system. The remodulating selector receives a WDM input signal, selects a particular optical channel from the WDM signal and places the informat... | 10/05/2010 |
| 7809268 | Integrated optical service channel and quantum key distribution channel A method for integrating an Optical Service Channel (OSC) with a Quantum Key Distribution (QKD) channel across a DWDM network having a single mode optical fiber is provided. An optical signal is received. An OSC is coupled with the optical signal. A QKD channel is i... | 10/05/2010 |
| 7809269 | Systems and methods for multiplexing QKD channels Systems and methods for multiplexing two or more channels of a quantum key distribution (QKD) system are disclosed. A method includes putting the optical public channel signal (SP1) in return-to-zero (RZ) format in a transmitter (T) in one QKD station (Alice)... | 10/05/2010 |
| 7787772 | Optical signal transmission device and optical communication network By using wavelength division multiplexing technologies, redundant star topology network is constructed on a ring-shaped optical fiber network. Edge-switches 5a, 5b, 5c, and 5d are connected to client station gr... | 08/31/2010 |
| 7769294 | Optical transmission network In an optical transmission network of the present invention, an optical signal output from a CWDM unit is combined on an optical transmission path of a DWDM network via a multiplexing filter arranged on a light output terminal of a DWDM unit adjacent to the CWDM uni... | 08/03/2010 |
| 7734180 | Single fibre bidirectional optical transmission system and single fibre bidirectional optical amplifier The present invention provides a single fiber bidirectional optical transmission system capable of realizing the extension of a single fiber bidirectional long distance at a moderate price. An optical signal outputted from a second optical transmitter is inci... | 06/08/2010 |
| 7664399 | Optical communication device An optical communication device whereby optical attenuation characteristics are linearized to suppress optical level variations among wavelengths attributable to the attenuation characteristics and thereby enable long-distance transmission. Optical attenuators atten... | 02/16/2010 |
| 7650074 | Optical transmission apparatus An optical transmission apparatus includes a demultiplexing unit that demultiplexes a light input to the optical transmission apparatus into a plurality of lights; an optical attenuator that adjusts an output level of a light within a band that includes a signal lig... | 01/19/2010 |
| 7646981 | WDM systems and methods A WDM optical system includes first and second WDM's including an optical link therebetween. Each WDM includes circuitry for linking multiplexer and demultiplexer circuitry to a plurality of modular elements. The modular elements include a first set of modules for c... | 01/12/2010 |
| 7636522 | Coolerless photonic integrated circuits (PICs) for WDM transmission networks and PICs operable with a floating signal channel grid changing with temperature but with fixed channel spacing in the floating grid A coolerless photonic integrated circuit (PIC), such as a semiconductor electro-absorption modulator/laser (EML) or a coolerless optical transmitter photonic integrated circuit (TxPIC), may be operated over a wide temperature range at temperatures higher then room t... | 12/22/2009 |
| 7634195 | Digital optical network architecture A digital optical network (DON) is a new approach to low-cost, more compact optical transmitter modules and optical receiver modules for deployment in optical transport networks (OTNs). One important aspect of a digital optical network is the incorporation in these ... | 12/15/2009 |
| 7630643 | Multimode optical transmission system and multimode optical transmission method Provided is a multimode optical transmission system capable of reducing an influence of multimode dispersion occurring when an optical signal is transmitted in multimode. Light sources (101 to 10m) respectively convert inputted electrical signal... | 12/08/2009 |
| 7613396 | Multiplexing communication system and crosstalk elimination method In a system where a quantum channel and a classical channel are multiplexed on a single optical transmission line and information is transmitted from a transmitter to a receiver through the quantum channel, the classical channel is inhibited from affecting the quant... | 11/03/2009 |
| 7609968 | Secure analog communication system using time and wavelength scrambling Described are a secure communications system and method for transmitting analog signals. The secure communications system includes an analog multiplexer, an analog demultiplexer, a plurality of analog communications channels each at a different wavelength, and a pai... | 10/27/2009 |
| 7574136 | Wavelength real time display on the equipment for WDM optical networking systems with wavelength tunable capability A wavelength tunable device for use in a wavelength division multiplexing (WDM) system comprising a display device for displaying at least one operating wavelength of the wavelength tunable device. The display device is electrically coupled to a control unit in the ... | 08/11/2009 |
| 7558481 | 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. Th... | 07/07/2009 |
| 7471902 | Wavelength allocation method of signal light, and optical transmission apparatus and wavelength division multiplexing optical transmission system using the method An object of the invention is to provide a wavelength allocation method of signal light, which is capable of consecutively allocating signal lights efficiently on wavelength grids, while suppressing degradation in transmission characteristic due to the generation of... | 12/30/2008 |
