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| Number | Title | Issue Date |
| 8190027 | Multifunctional and reconfigurable optical node and optical network An optical node includes a reconfigurable optical add drop multiplexer (ROADM) core configured to transmit optical signals of multiple wavelengths to and receive optical signals of multiple wavelengths from another optical node. The ROADM core is also configured to ... | 05/29/2012 |
| 8170417 | Mechanism to detect an unstable wavelength channel and limit its impact on a ROADM network A system and method for limiting the impact of an unstable wavelength on other wavelengths in a reconfigurable optical add/drop multiplexer (ROADM) network are disclosed. The method generally comprises measuring optical channel power at prescribed time intervals; fo... | 05/01/2012 |
| 8165467 | Optical transmission system and optical node Where an integrated monitoring and controlling unit is to control an optical add-drop unit so as to cause transmit signals from the optical transceiver of a first optical node to be received by the optical transceivers of plural different optical nodes, this purpose... | 04/24/2012 |
| 8165469 | Cascade and ring measurement sensor with fixed and variant wavelength encoding An optical add drop multiplexer (OADM) for use in a sensing system has the OADMs arranged either in a cascade or in a ring, with each OADM accepting a source input and generating a source output, and accepting a signal input and generating a signal output, where the... | 04/24/2012 |
| 8165468 | Methods and apparatus for performing directionless wavelength addition and subtraction within a ROADM based optical node In today's reconfigurable optical add/drop multiplexer (ROADM) based optical node, transponders associated with the ROADMs' add/drop ports are dedicated to a given network node interface. Dedicated transponders reduce the flexibility to route around network failures... | 04/24/2012 |
| 8160446 | Methods and systems to stabilize an optical network against nodal gain changes The present invention provides methods and systems to stabilize an optical network against nodal gain changes through two nested control loops for controlling node gain and node output power. The present invention includes two nested control-loops running at differe... | 04/17/2012 |
| 8131151 | Testing and measurement in optical networks An optical node may include a plurality of optical input components operable to receive a plurality of signals communicated in an optical network and a plurality of optical output components operable to transmit a plurality of signals to be communicated in the optic... | 03/06/2012 |
| 8131152 | Optical add/drop multiplexer An optical add/drop multiplexer includes a first optical coupler receiving an optical signal including a plurality of multiplexed wavelengths, a wavelength blocker receiving the optical signal from the first optical coupler, and blocking at least one wavelength of t... | 03/06/2012 |
| 8131150 | Tunable bidirectional multiplexer/demultiplexer for optical transmission system A tunable bidirectional multiplexer/demultiplexer (MUX/DEMUX) is disclosed for adding and dropping wavelength channels between an optical transmission system and at least one optical transceiver. The MUX/DEMUX includes at least one add port for adding wavelength cha... | 03/06/2012 |
| 8126329 | Quad-port optical module with pass-through and add/drop configuration Techniques are disclosed for providing bi-directional data services involving a plurality of wavelengths. The data services may be hybrid in nature, including both digital and analog data signals. The techniques may be implemented, for instance, in an optical module... | 02/28/2012 |
| 8126330 | Dynamic wavelength service over a ROADM optical network A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network to form a wave division multiplexing virtual private network is disclosed. The system includes at least one optical transponder... | 02/28/2012 |
| 8121482 | Spatial light modulator-based reconfigurable optical add-drop multiplexer and method of adding an optical channel using the same A reconfigurable optical add-drop multiplexer (ROADM) and a method of passing at least one optical channel through the multiplexer. In one embodiment, the multiplexer includes: (1) a main input port, (2) a main output port, (3) an add input port, (4) a drop output p... | 02/21/2012 |
| 8121483 | Packaging a reconfigurable optical add-drop module A hermetically packaged, MEMS array-based ROADM module is disclosed. The enclosure sidewalls and a top lid are made of Kovar, and the base is made of alumina ceramic AuSn-soldered to the enclosure sidewalls. The MEMS array is attached to the ceramic base. The optics... | 02/21/2012 |
| 8116631 | Hardened, wavelength enabled optical capacity Providing bandwidth expansion in existing HFC infrastructures. A break in a fiber ring is established. A temperature hardened demultiplexer is coupled at the break to an input side of the fiber ring. A temperature hardened multiplexer is coupled at the break to an o... | 02/14/2012 |
| 8116629 | Reconfigurable optical add drop multiplexer core device, procedure and system using such device, optical light distributor, and coupling-ratio assigning procedure A reconfigurable optical add drop multiplexer core device includes a light distributor, a light combiner, and first and second sets of add and drop ports. The light distributor is configured to receive an optical signal along a primary input of the reconfigurable op... | 02/14/2012 |
| 8116630 | Methods for dynamic wavelength add/drop in a ROADM optical network A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network is disclosed. The system includes at least one optical transponder, a plurality of optical fan-out devices, each arranged to re... | 02/14/2012 |
| 8111995 | Shared, colorless add/drop configuration for a ROADM network using M×N wavelength switches A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network is disclosed. The system includes a plurality of M×N wavelength selective switches (WSS) for locally dropping selected wavelen... | 02/07/2012 |
| 8095008 | Systems and methods for a multiple-input, multiple-output controller in a reconfigurable optical network The present invention provides systems and methods to convert a reconfigurable optical node multiple-input multiple-output (MIMO) system to a single-input single-output (SISO) system suitable for a proportional-integral-differential (PID) control process. Advantageo... | 01/10/2012 |
| 8095009 | Method, system and apparatus for distributing node information A method for distributing node information, including an optical node generating an information bit stream based on its own node information and distributing the information bit stream it generates and a wavelength sequence corresponding to the node information. Acc... | 01/10/2012 |
| 8095007 | Optical add/drop multiplexer using integrated optical components An optical add/drop multiplexer incorporates an integrated receiver module and an integrated transmitter which are interfaced to an intervening electrical network to provide an add/drop/pass-through functionality. The receiver module incorporates a wavelength demult... | 01/10/2012 |
| 8073332 | Photonic cross-connect A photonic cross-connect includes a plurality of ingress WS-switches with drop outputs outputting WDM drop signals including odd channels and a plurality of egress WS-switches for receiving WDM add signals including add channels. Wavelength selective elements in a d... | 12/06/2011 |
| 8050564 | Coherent optical channel substitution In an optical data transmission system, one channel is removed from a group of wavelength division multiplexed optical channels and another channel carrying different information at the same wavelength is inserted in its place. The process occurs by adding an optica... | 11/01/2011 |
| 8050563 | Self checking optical add drop multiplexer A technique is proposed for performing add/drop operations in an OADM assembly serving an optical network and comprising an add unit and a drop unit. With respect to at least one optical channel assigned to an optical wavelength λ, the OADM assembly is capable of d... | 11/01/2011 |
| 8032028 | Optical add/drop device Optical add/drop nodes are used in a network having a pair of optical transmission paths for transmitting optical signals in opposite directions to each other. Each add/drop node comprises a variable split ratio optical coupler for splitting an optical signal output... | 10/04/2011 |
| 8023825 | Optical switching architectures for nodes in WDM mesh and ring networks Switching architectures for WDM mesh and ring network nodes are presented. In mesh networks, the switching architectures have multiple levels—a network level having wavelength routers for add, drop and pass-through functions, an intermediate level having device un... | 09/20/2011 |
| 8009987 | Optical add/drop multiplexer There is provided a shutdown controller that monitors the temperature of an optical multiplexer and maximizes the loss of an optical attenuator when a temperature monitor result is abnormal. An optical level change detection circuit section is disposed with respect ... | 08/30/2011 |
| 8009986 | Optical node for mesh-type WDM optical network An optical node capable of supporting a mesh-type optical network is provided. The node includes: N ROADMs, which separate specific wavelength channels from a multiple wavelength channel optical signal that is input from any node constituting the optical network, al... | 08/30/2011 |
| 7986881 | Optical transmission systems, devices, and methods Optical communications systems including grooming, protection, restoration, and migration on a unified network platform, and using a unified control plane. The systems may include combinations of optical bypass and mesh restoration, may include combinations of share... | 07/26/2011 |
| 7925165 | Packet and optical routing equipment and method A packet and optical routing equipment exchanges multiplexed optical signals with other equipment in a network and exchanges branch non-packet and packet signals with client equipment. The entering branch non-packet signals are converted into electric signals by a n... | 04/12/2011 |
| 7912373 | Optical multiple transmission method, optical network and optical transmission apparatus In a known wavelength multiplexer, optical signals to pass are passed with their wavelengths held identical. Therefore, unless an unused wavelength common to all zones exists in case of setting an optical channel, the channel cannot be set. According to the present ... | 03/22/2011 |
| 7903975 | Optical add-drop multiplexer A problem to be solved in an optical communication system for carrying out bidirectional transmission between communication nodes by wavelength-division-multiplexed optical signals is that a plurality of optical add-drop multiplexers installed in the communication n... | 03/08/2011 |
| 7860396 | Noise reduction in optical communications networks The add path of a dense wavelength division multiplexing (DWDM) add/drop node comprises an n:1 coupler for combining n signal sources. The combined signal is amplified and then demultiplexed. Each output of the demultiplexer is passed through a variable optical atte... | 12/28/2010 |
| 7853148 | Optical add/drop multiplexer An optical add/drop multiplexer includes a first optical coupler receiving an optical signal including a plurality of multiplexed wavelengths, a wavelength blocker receiving the optical signal from the first optical coupler, and blocking at least one wavelength of t... | 12/14/2010 |
| 7844182 | Optical network architecture for simultaneous transport of analog video signals and ethernet data Methods and apparatus are described for simultaneous transport of analog video signals and Ethernet data on an optical fiber. A method includes propagating a downstream signal on an optical signal conductor from an upstream combiner to a downstream combiner; and pro... | 11/30/2010 |
| 7835645 | Optical circuit structure for realizing a higher-order node in an optical transmission network The invention relates to an optical circuit structure for realizing a higher-order node in an optical transmission network with a number N of bidirectional remote ports, wherein an optical receive wavelength division multiplexed signal with a set of optical receive ... | 11/16/2010 |
| 7831148 | Optical network and amplifier node therefore An optical network comprises a transmitter node (1), a receiver node (4) and an optical fiber (3) for transmitting an optical wavelength-division multiplex signal having payload channels and a supervisory channel between the nodes (1, 4).... | 11/09/2010 |
| 7831149 | Optical transmission device An optical transmission device capable of preventing deterioration in the transmission quality of a signal beam. A wavelength-multiplexed signal beam from a transmission path is split by a splitter, and the split signal beams are input to first and second optical pa... | 11/09/2010 |
| 7826747 | Optical burst transport using an electro-optic switch An optical node for optical burst transport includes optical components operable to transmit and receive optical signals over an optical transmission medium. The optical components include a demultiplexer that is operable to receive a wavelength division multiplexed... | 11/02/2010 |
| 7826748 | Systems and methods for adaptive gain control to compensate OSNR penalty caused by side-lobe of MEMS-based reconfigurable optical add-drop multiplexers The present invention provides systems and methods to adaptively control amplifier target power to maintain signal launching power as per design in networks with wavelength selective switch (WSS)-based reconfigurable optical add-drop multiplexers (ROADMs) using micr... | 11/02/2010 |
| 7801445 | Method and apparatus for DWDM line card A system and method for multiple-channel line card. The system includes a first photonic integrated device configured to receive a first optical signal and output a first plurality of electrical signals for a first plurality of channels respectively. The first plura... | 09/21/2010 |
