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| Number | Title | Issue Date |
| 8180221 | Wavelength-division multiplexed passive optical network for reducing degradation in noise characteristic of wavelength-locked fabry-perot laser diodes The present invention relates to a wavelength-division multiplexed passive optical network (WDM-PON) for reducing degradation in noise characteristic of a wavelength-locked Fabry-Perot Laser Diode (F-P LD). A WDM-PON for reducing degradation in a noise characteristi... | 05/15/2012 |
| 8155523 | WDM PON RF overlay architecture based on quantum dot multi-wavelength laser source In a Wavelength Division Multiplexed Passive Optical Network (WDM-PON) including, a system for overlaying an analog broadcast signal. An Optical Line Terminal of the WDM-PON includes a broadband light source for generating uplink seed light for each uplink channel o... | 04/10/2012 |
| 8139940 | Wavelength division multiplexing transmission system and remote apparatus and station apparatus used therein There is provided a wavelength division multiplexing transmission system and apparatuses used therein, in which a remote apparatus to be newly added to a station apparatus autonomously sets a wavelength to be used in the remote apparatus, thereby avoiding the need f... | 03/20/2012 |
| 8135278 | Bidirectional wavelength-division-multiplexed passive optical network Provided is a bidirectional wavelength division multiplexed passive optical network (WDM-PON) which includes a central office (CO) that transmits and receives multiplexed optical signals, a remote node (RN) that communicates with the CO, receives a multiplexed optic... | 03/13/2012 |
| 8095006 | Configuration of passive optical networks including cascaded array waveguide gratings Techniques for partitioning and/or combining at least a portion of an optical network tree including one or more array waveguide gratings (“AWGs”) and fibers in wavelength division multiplexing (“WDM”) passive optical networks (“PON”) with cascaded AWGs ... | 01/10/2012 |
| 8073331 | Dynamic intelligent bidirectional optical and wireless access communication system According to one embodiment of the present invention, a wavelength-shifted dynamic intelligent bidirectional access optical system utilizes key optical elements such as: a quantum dot enabled semiconductor optical amplifier, a phase modulator and an intensity modula... | 12/06/2011 |
| 8023822 | Optical band splitter/combiner device comprising a three-arms interferometer A three-arm-Mach-Zehnder interferometer for splitting/combining a first and a second wavelength band, wherein the optical device includes: a first and second optical splitting/combining element; a differential optical delay device comprising a first, a second and a ... | 09/20/2011 |
| 7877013 | Method and system for random channel assignment in WDM based passive optical networks A wavelength division multiplexing based passive optical network is disclosed. The network includes an optical line terminal; a power optical splitter connecting to the optical line terminal by an optical fiber; and several optical network units. Each of the optical... | 01/25/2011 |
| 7873277 | Passive optical network system and wavelength assignment method In a PON system with WDM, at the time of initial setting, each ONU negotiates with an OLT, and automatically acquires a wavelength which can be used by the ONU. One wavelength for negotiation of assigned wavelength is fixed as a default, and a newly connected ONU fi... | 01/18/2011 |
| 7809266 | Method and apparatus for providing data confidentially for very high-speed multiple-wavelength optical data links A DWDM optical system in a first embodiment includes a plurality of scramblers on the transmit side and a plurality of corresponding de-scramblers on the receiver side of the DWDM system. Each scrambler includes an input for an encryption key with the corresponding ... | 10/05/2010 |
| 7796887 | Wavelength division multiplexing optical transmission system, and wavelength division multiplexing optical transmission method The invention aims to provide an optical transmission system that specifies such a transmission condition so as to obtain high spectrum efficiency and a large transmission distance-capacity product at the same time, and uses low cost and small sized optical senders ... | 09/14/2010 |
| 7787771 | Extendable loop-back type passive optical network and scheduling method and apparatus for the same Provided are extendable loop-back passive optical network (PON) and scheduling method and apparatus for the same. The loop-back type PON includes an OLT (optical line terminal) including a wavelength-tunable optical transmitter and a wavelength-locked optical receiv... | 08/31/2010 |
| 7751710 | Photonic cross-connector system, WDM system using the same photonic cross-connector, and optical communication network based on the same WDM system Provided are a photonic cross-connector system, a wavelength division multiplexing (WDM) system using the photonic cross-connector system, and an optical communication network based on the WDM system. The photonic cross-connector system includes: an optical coupler ... | 07/06/2010 |
| 7684703 | Wavelength division multiplexing transmission system and remote apparatus and station apparatus used therein There is provided a wavelength division multiplexing transmission system and apparatuses used therein, in which a remote apparatus to be newly added to a station apparatus autonomously sets a wavelength to be used in the remote apparatus, thereby avoiding the need f... | 03/23/2010 |
| 7639946 | Distribution node for an optical network A distribution node for an optical network is provided that includes an integrated filter module comprising a first thin-film and a second thin-film coupled to a common substrate and operable to receive a first downstream signal at the substrate comprising at least ... | 12/29/2009 |
| 7630638 | Shared multi-lambda source for WDM PON Shared optical carrier sources for the OLT's are provided. An apparatus comprises a plurality of optical carrier generators, each optical carrier generator outputting an optical carrier at a different wavelength, an optical multiplexer operable to combine the plural... | 12/08/2009 |
| 7616891 | System and method for transmission and reception of traffic in optical light-trails An optical network is provided that carries optical traffic in multiplexed wavelengths between a number of nodes. The network includes at least one light-trail associated with one of the wavelengths and established between a subset of the nodes in the network. The n... | 11/10/2009 |
| 7493042 | High-speed fiber-to-the-premise optical communication system An optical communication system including a plurality of transceiver ports each including a transmitter configured to produce a downstream MLM-spectrum signal and a receiver configured to receive an upstream spectrum-sliced signal. The spectrum of the downstream MLM... | 02/17/2009 |
| 7450848 | High-speed fiber-to-the-premise optical communication system An optical communication system including a plurality of transceiver ports each including a transmitter configured to produce a downstream MLM-spectrum signal and a receiver configured to receive an upstream spectrum-sliced signal. The spectrum of the downstream MLM... | 11/11/2008 |
| 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 |
| 7433598 | Uncooled laser generation of narrowcast CATV signal A cable television (CATV) distribution system, and a method of forming and using the CATV distribution system. In a first embodiment, a narrowcast optical signal is generated by an uncooled laser and converted by a receiver into a narrowcast electrical signal. In a ... | 10/07/2008 |
| 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 |
| 7418204 | Passive optical network system providing simultaneously both broadcasting service and data service A passive optical network system is disclosed that simultaneously provides both broadcasting service and data service. The passive optical network (PON) amplifies the optical signals for the broadcasting service in an optical amplifier media of the local office by p... | 08/26/2008 |
| 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 |
| 7403712 | 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... | 07/22/2008 |
| 7398021 | Optical transmitter and passive optical network using the same An optical transmitter including a multi-lambda source to output injection light consisting of a plurality of injection wavelengths in channels, a circulator having a first port, a second port, and a third port, the circulator receiving the injection light at the fi... | 07/08/2008 |
| 7394981 | Optical communication management systems An optical medium, whether inside or outside an internet/telecommunications backbone, is managed using a management signal at a wavelength which is distinct from wavelengths of service signals. A multiplexer multiplexes the management signal onto the optical medium,... | 07/01/2008 |
| 7394984 | Fiber access architecture capable of being seamlessly upgraded Disclosed is an architecture enabling premium services to be provided over fiber to high-end users/customers. This architecture has a plurality of nodes and a passive optical device inserted prior to one of the nodes. The optical device allows wavelengths provisione... | 07/01/2008 |
| 7391972 | Method and apparatus for maintaining behavior of a network terminal A method of controlling behavior of an element in a passive optical network (PON) is provided. The method includes (i) issuing a message from a first PON element to a second PON element to cause the second PON element to enter or maintain a state of upstream communi... | 06/24/2008 |
| 7389047 | Optical ring transmission network The network comprises an optical ring link (F) and a concentrator (HUB) that sends via one end of the link “downlink” optical signals carried by respective wavelengths and receives “uplink” optical signals via the other end of the link. The link is divided i... | 06/17/2008 |
| 7389043 | Protection architecture for photonic switch using tunable optical filter A method and a protection switching arrangement for protection switching of any one of a plurality of optical signals of a multi-wavelength optical signal from the failure of an optical component is provided. The multi-wavelength optical signal which contains the op... | 06/17/2008 |
| 7389048 | Optical wavelength-division multiple access system and optical network unit The present invention provides an optical wavelength-division multiple access system and a corresponding optical network unit. A wavelength band Da (wavelengths λd1 to λdn) for downlink optical signals corresponding to the n ONUs, a wavelength band Ua (wave... | 06/17/2008 |
| 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 |
| 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 |
| 7369769 | Ethernet passive optical network ring and its method of authorization and collision detection An Ethernet passive optical network (EPON) ring for providing protection against fiber failures. The optical network unit (ONU) is coupled to the ring fiber by a three-port passive optical splitting module that has three two-way optical passages. By the three two-wa... | 05/06/2008 |
| 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 |
| 7366416 | Hub for a passive optical network hub A hub for use in a passive optical network (PON) includes a transmission fiber on which an information-bearing optical signal is received, a double-cladded, rare-earth doped fiber located along the transmission fiber for imparting gain to the information-bearing opt... | 04/29/2008 |
| 7362931 | Optical conversion device for shared FTTH distribution network An optical conversion device for a shared FTTH distribution network including first and second optical fibers and an optical processing circuit. The optical processing circuit has an input for receiving a first optical analog signal carried by the first optical fibe... | 04/22/2008 |
| 7359592 | Single fiber links for full duplex aircraft data network A method for creating a full duplex fiber optic network using one single fiber optic cable of the multimode fiber type for simultaneous transmission and reception is described. The method includes the steps of equipping end user devices and switches with bidirection... | 04/15/2008 |
