Wdm Patents (Class 398/7)
  • Patent number: 9853726
    Abstract: This disclosure relates to optical line system equipment, which enables wavelength addition for long haul transmission. The system is configured to prevent contention of wavelengths added into a multiplexer. For example, an optical wavelength combiner, such as a multiplexer, may include components that are configured to detect potential collisions between existing wavelengths and a newly added wavelength, and block the addition of the conflicting wavelength while alerting the operator.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: December 26, 2017
    Assignee: Infinera Corporation
    Inventors: Saurabh Kumar, Sanjeev Ramachandran, Baranidhar Ramanathan
  • Patent number: 9768899
    Abstract: An optical add/drop multiplexer branching apparatus is provided in the embodiments of the present invention, where the optical add/drop multiplexer branching unit includes: a trunk input end, a branch input end, a trunk output end, a branch output end, an optical add/drop multiplexer, a first coupler, a first detection circuit, and a control circuit, where the optical add/drop multiplexer includes an optical switch. A detection circuit detects whether a fault occurs in a trunk, and in a case in which a fault occurs in the trunk, a working mode is switched from a first working mode to a second working mode, to implement automatic redundancy on the trunk and ensure normal communication on a branch.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: September 19, 2017
    Assignee: Huawei Marine Networks Co., Ltd.
    Inventors: Likun Zhang, Wendou Zhang, Keqiang Cui
  • Patent number: 9621969
    Abstract: Apparatuses are disclosed including a node having a switch for communicating traffic from input interface to output interface; and a control module, located proximate to the input interface, output interface and switch, comprising a communication interface configured to connect to a third communication link external to the node and having a processor accessing network node configuration information and being configured to compute a path to a destination node through the output interface with the network node configuration information and also configured to be switched from a first state in which the processor provides first instructions to the switch to configure the switch to communicate the traffic from the input interface to the output interface, to a second state in which the processor provides second instructions, received via the communication interface, to the switch to configure the switch to communicate traffic from the input interface to the output interface.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: April 11, 2017
    Assignee: Infinera Corporation
    Inventors: Sharfuddin Syed, Ping Pan, Abhinava Shivakumar Sadasivarao, Chris Liou
  • Patent number: 9451343
    Abstract: A method for bandwidth management in an optical broadcast network includes signaling, for a new optical broadcast service, from an originating node to all nodes in the optical broadcast network, wherein the signaling identifies a wavelength or portion of spectrum associated with the new optical broadcast service; at each of the nodes, checking for contention by the new optical broadcast service; responsive to identifying contention at one of the nodes, signaling the identified contention back to the originating node; and responsive to no contention at any of the nodes, processing the signaling, storing an update of the new optical broadcast service, and either forwarding the signaling to peer nodes or terminating the signaling.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: September 20, 2016
    Assignee: Ciena Corporation
    Inventors: Anurag Prakash, Mohit Chhillar, Dominic Richens, Hari Srinivasan
  • Patent number: 9414138
    Abstract: A method for bandwidth management in an optical broadcast network includes signaling, for a new optical broadcast service, from an originating node to all nodes in the optical broadcast network, wherein the signaling identifies a wavelength or portion of spectrum associated with the new optical broadcast service; at each of the nodes, checking for contention by the new optical broadcast service; responsive to identifying contention at one of the nodes, signaling the identified contention back to the originating node; and responsive to no contention at any of the nodes, processing the signaling, storing an update of the new optical broadcast service, and either forwarding the signaling to peer nodes or terminating the signaling.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: August 9, 2016
    Assignee: Ciena Corporation
    Inventors: Anurag Prakash, Mohit Chhillar, Dominic Richens, Hari Srinivasan
  • Patent number: 9118411
    Abstract: In some embodiments, an apparatus includes an optical transceiver system that includes a set of optical transmitters and a backup optical transmitter. In such embodiments, each optical transmitter from the set of optical transmitter can transmit at a unique wavelength from a set of wavelengths. The backup optical transmitter can transmit at a wavelength from the set of wavelengths when an optical transmitter from the set of optical transmitters associated with that wavelength fails. In other embodiments, an apparatus includes an optical transceiver system that includes a set of optical receivers and a backup optical receiver. The backup optical receiver can receive at a wavelength from the set of wavelengths when an optical receiver from the set of optical receivers associated with that wavelength fails.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: August 25, 2015
    Assignee: Juniper Networks, Inc.
    Inventors: Theodore J. Schmidt, Pradeep Sindhu, George R. Sosnowski, Christian Malouin, Roberto Marcoccia, Valery Kugel, Gunes Aybay
  • Patent number: 9059815
    Abstract: The present invention provides an improved optical communication network (300) that utilizes an apparatus of optical channel protection. The apparatus for optical channel protection of the present invention including a transmitting end network switch (200), a first and a second receiving end network switch (201, 202), a plurality of wavelength tuneable transmitting end transponders (400, 401 . . . 405), a plurality of wavelength tuneable receiving end transponders (400?, 401? . . . 405?), a transmitting end controller (10a) connected to a network monitoring and control system (100a) and a receiving end controller (10b) connected to said network monitoring and control system (100a). The present invention utilizes a method of optical channel protection that can be broadly categorized under optical multiplex switching.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: June 16, 2015
    Assignee: Telekom Malaysia Berhad
    Inventors: Zulhedry Abdul Manaf, Dress Andriyanto M. Ssi, Dedy Tarsono, Asmahanim Ahmad
  • Patent number: 9002194
    Abstract: A multi-path provisioning scheme is provided to ensure full protection while reducing or minimizing resource overbuild. A signal to be provisioned is divided at a source node into a plurality of sub-signals that are independently routed from the source node to a destination node. Bandwidth for back-up traffic B is allocated in addition to bandwidth for primary traffic T. In some embodiments, the initial bandwidth B of the backup traffic equals the bandwidth of the primary traffic. The T+B traffic is initially distributed so that no link carries more than B traffic. The traffic distribution pattern is then iteratively revised to reduce the bandwidth requirements for the backup traffic while still meeting requirements for protection.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: April 7, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Ming Xia, Stefan Dahlfort
  • Patent number: 8983286
    Abstract: A node of an optical transport network system transmits optical wavelengths to an adjacent node through an operational line. An apparatus for protection switching of the optical transport network system transmits only an optical channel with a fault among a plurality of optical channels composed of flexible optical channel data units in an optical wavelength of the operational line, via a reserve line.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: March 17, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ji Wook Youn, Jongho Kim, Jong-Yoon Shin
  • Patent number: 8965199
    Abstract: The present invention provides a method and apparatus for automatically restoring node resource state in the Dense Wavelength Division Multiplexing Based Automatic Switched Optical Network (WSON) system. This method comprises the following steps: using each node in the WSON system as an initiation node and notifying the resource state of the initiation node to a neighboring node; the neighboring node comparing the received resource state of the initiation node with the resource state of the present end; and under the condition that the resource state of the initiation node and that of the neighboring node are inconsistent, according to the actual resource state, determining one of the initiation node and the neighboring node to be the node whose resource is occupied, and automatically releasing the resource of the node. The present invention also provides an apparatus for automatically restoring node resource state in the WSON system.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: February 24, 2015
    Assignee: ZTE Corporation
    Inventor: Jing Wang
  • Patent number: 8958701
    Abstract: A method, a network, and a node each implement the transmission of Automatic Protection Switching (APS) switching coordination bytes across an OTN network. A working signal and a protection signal are received, one of which is designated as an active signal. The active signal is encapsulated in an Optical channel Data Unit (ODU) signal. APS switching coordination bytes from the working and protection signals are placed in an overhead segment of the ODU signal. The ODU signal is transmitted into and received from an Optical Transport Network (OTN) network. The working and protection signals are recreated based on the active signal encapsulated in the ODU signal and the APS switching coordination bytes in the overhead segment. The recreated working and protection signals are transmitted. In this manner, a single ODU signal may be used to transmit both the working and protection signals.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: February 17, 2015
    Assignee: Ciena Corporation
    Inventors: Abhishek Chaudhary, Hongxing Meng, Satish Gopalakrishna
  • Patent number: 8953936
    Abstract: An Optical Line Termination (OLT) system in a multi-wavelength Passive Optical Network (PON) includes a protection port for protecting a set of OLT ports without the use of a physical switch. The protection port has a tunable transceiver. The OLT system detects a failure of one of the OLT ports, which was originally adapted to transmit downstream traffic to a subset of ONUs on a downstream wavelength and to receive upstream traffic from the subset of ONUs on an upstream wavelength. In response to the detection, the OLT system tunes the protection port to the downstream wavelength for transmission and to the upstream wavelength for reception, and resumes communication between the OLT system and the subset of ONUs through the protection port instead of the OLT port.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: February 10, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: David Hood
  • Patent number: 8917986
    Abstract: A optical transmission system includes light sources generating light of at least two wavelengths, where any two adjacent wavelengths are separated by less than 10 nm. The wavelengths fall within the zero dispersion zone of an optical fiber, and may be shifted by 1 nm or less to reduce crosstalk effects.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: December 23, 2014
    Assignee: ARRIS Solutions, Inc.
    Inventors: Venk Mutalik, Marcel F. Schemmann, Long Zou, Zhijian Sun
  • Patent number: 8909038
    Abstract: A method and apparatus for determining if an optical input signals has been interrupted and responsively replacing an interrupted optical input signal with a replacement optical signal having a similar optical profile (e.g., such as a loopback between OADMs within a backbone network), thereby insuring that transient-induced high speed optical amplifier adjustments are avoided.
    Type: Grant
    Filed: January 7, 2003
    Date of Patent: December 9, 2014
    Assignee: Alcatel Lucent
    Inventors: Cristina Barbosa Cannon, Stefan Hunsche
  • Publication number: 20140355976
    Abstract: The optical transmission device includes an N×N optical switch, an optical packet receiver and an optical packet generation unit. The N×N optical switch transmits data in which a plurality of optical signals each having a different wavelength is multiplexed. The optical packet receiver detects change in the number of wavelengths of optical signals constituting the data. The optical packet generation unit generates, when the change is detected by the optical packet receiver, data to be transmitted by the N×N optical switch, using optical signals for the number of wavelengths after the change.
    Type: Application
    Filed: June 3, 2014
    Publication date: December 4, 2014
    Applicants: FUJITSU LIMITED, FUJITSU TELECOM NETWORKS LIMITED
    Inventors: Koji Matsunaga, Tatsuya Toyozumi, Yasuo Tanaka, Yuichiro Sakane, Koji Bato, Wataru Kawasaki, Tatsuhiko Saito
  • Patent number: 8886032
    Abstract: When a failure occurs in operational transmission multiplexing transponders 6-1 to 6-N, a wavelength multiplexing optical transmission system carries out selection switching control on N×1 optical switches 5-1 to 5-m and (N+1)×N optical switches 11-1 to 11-m to transmit a wavelength-multiplexed light signal by using reserve transmission and reception multiplexing transponders 6-R and 10-R, thereby sidestepping the failure.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: November 11, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Shigeo Tominaga
  • Publication number: 20140328583
    Abstract: Embodiments of the disclosure are directed to optical dark section conditioning. An embodiment generates at least one of a broadband noise or signal at the head end of a section for a first module of the section; and operates all other modules of the section in gain control mode.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 6, 2014
    Applicant: Ciena Corporation
    Inventors: Choudhury A. AL SAYEED, David Miedema, Loren S. Berg, Dave C. Bownass
  • Patent number: 8861956
    Abstract: An apparatus switches paths in a wavelength-multiplexing network in which a first number of wavelengths each used for a path to transmit an optical signal are multiplexed into an optical fiber. The apparatus includes an entire switching unit and a second number of individual switching units where the second number is smaller than the first number. The entire switching unit is configured to perform a path-switching process for switching a path, simultaneously on all the first number of wavelengths when failures have occurred for all the first number of wavelengths. The second number of individual switching units are each configured to perform the path-switching process individually on one of a third number of wavelengths included in the first number of wavelengths when at least one failure has occurred for the third number of wavelengths where the third numbers is smaller than the first number.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: October 14, 2014
    Assignee: Fujitsu Limited
    Inventors: Yasuki Fujii, Ryoichi Mutoh, Toru Katagiri
  • Patent number: 8849108
    Abstract: A method includes detecting wavelength collision including identifying a pair or pairs of ONTs that transmit the colliding wavelengths and recovering from collision wherein wavelengths of the pair or pairs of ONTs that cause collisions are re-adjusted to eliminate the collision.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: September 30, 2014
    Assignee: Aurora Networks Inc
    Inventors: Krzysztof Pradzynski, Sudhesh Mysore, Oleh Sniezko
  • Patent number: 8824899
    Abstract: OSUs 1 to N are connected to a plurality of PON lines respectively. A control unit performs processing for registering a plurality of subscriber devices connected to the plurality of PON lines respectively and processing for allocating a bandwidth. In addition, the control unit switches an OSU while a state of registration of the plurality of subscriber devices is maintained, by changing a communication path between the plurality of PON lines and a plurality of OSUs 1 to N.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: September 2, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Kazuhisa Yamashita
  • Patent number: 8824885
    Abstract: Optical network protection devices and protection methods including: a working line; a protection line; a determination module configured to determine the protection type of optical network; a first judgment module configured to judge whether the working line is normal according to performance parameter values of service signal in the working line and switching conditions configured for multiplexing section protection when the protection type of optical network is the multiplexing section protection; a second judgment module, configured to judge whether the working line is normal according to performance parameter values of service signal in the working line and switching conditions configured for channel section protection when the protection type of optical network is the channel section protection; a switching module, configured to take the service signal in the protection line as an output signal when working line is abnormal.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: September 2, 2014
    Assignee: ZTE Corporation
    Inventors: Zhennan Liu, Yong You
  • Patent number: 8818201
    Abstract: This concerns a protected long-reach PON having a plurality of terminals connected to a distribution network that is fed by both a main and back up feed, each feed including a head end and a repeater. The back up head end had access to a ranging table with data previously obtained by the main head end, thereby speeding up the switch over in the event of a fault with the main feed. In one embodiment, the repeater has a virtual ONU therein, allowing the back up repeater to be ranged by the back up head end, thereby yet further speeding up the ranging procedure. The main and back up repeaters are sufficiently equidistant from the distribution network to allow the back up head to perform normal scheduling without performing a ranging operation on each of the terminals, even if the different terminals transmit at slightly different wavelengths. This is achieved using the ranging information obtained with regard to the back up repeater.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: August 26, 2014
    Assignee: British Telecommunications plc
    Inventor: Peter Healey
  • Patent number: 8798454
    Abstract: Systems and methods for distributing signals in an optical network are disclosed. In accordance with one embodiment of the present disclosure a method for distributing signals in an optical network comprises combining input signals into one or more output signals, determining, an availability status of optical lanes for carrying the output signals and distributing the output signals to optical transmitters associated with the optical lanes if the availability status indicates that the optical lanes are available.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: August 5, 2014
    Assignee: Fujitsu Limited
    Inventor: Youichi Akasaka
  • Patent number: 8731398
    Abstract: An optical network system that performs transmission of N:1 protection includes a node that includes transmission-side operating muxponders that multiplex client signals for every M-channel signal bundle and convert multiplexed signals into optical signals having different wavelengths, transmission-side optical couplers that branch the client signals into two channels of operating and redundant, transmission-side optical switches each selecting one channel from redundant signals as a redundant client signal, and a transmission-side redundant muxponder that performs a predetermined transmission-side process according to an accommodation mode set on the redundant client signal and then multiplexes the redundant client signals, converts the multiplexed signal into an optical signal having a wavelength different from that of the operating signal, thereby making the accommodation mode settable for each channel in an independent manner.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: May 20, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Akiyama, Kazuo Kubo, Sota Yoshida
  • Patent number: 8724984
    Abstract: In one embodiment, notifications of upcoming maintenance activities are provided by network devices, such as to allow packet switching or other optical layer client devices to reroute traffic prior to the occurrence of the traffic affecting event. For example, one such network device includes optical interfaces for coupling with fibers for transporting information using dense wavelength-division multiplexing (DWDM); DWDM switching equipment for cross-connecting wavelengths of the fibers; and a controller configured to inform packet switching or other optical layer client devices whose traffic would be affected by an upcoming event that would disrupt communication on one or more wavelengths on one or more fibers so that the packet switching or other optical layer client devices can reroute traffic that would otherwise go over said one or more wavelengths onto a different path in a network prior to said disruption.
    Type: Grant
    Filed: January 19, 2009
    Date of Patent: May 13, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Ornan Alexander Gerstel, David Delano Ward
  • Patent number: 8718466
    Abstract: A wave division multiplexing (WDM) system is disclosed which accommodates shifts in the resonant frequency of optical modulators by using at least two carriers per optical communications channel and at least two resonant modulator circuits respectively associated with the carriers within each optical modulator. A first resonant modulator circuit resonates with a first carrier and a second resonates with a second carrier when there is a shift in resonance frequency of the at least two resonant optical modulator circuits. A switch circuit controls which carrier is being modulated by its respective resonant modulator circuit.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: May 6, 2014
    Assignee: Micron Technology Inc.
    Inventors: Roy Meade, Gurtej Sandhu
  • Patent number: 8705952
    Abstract: The present invention embraces an optical wavelength division multiplex (WDM) transmission system, especially a WDM passive optical network, typically including a central node having a first and a second WDM port and a remote node having a first and a second WDM port and a plurality of channel ports, the central node first WDM port being connected to the remote node first WDM port via a bidirectional single-fiber optical working path and the central node second WDM port being connected to the remote node second WDM port via a single-fiber bidirectional optical protection path, and a group of basic optical node units (ONU's) each of which is connected to a respective remote node channel port via a bidirectional optical ONU path, each ONU including an optical receiver for receiving a downstream optical channel signal and an optical tunable transmitter for creating an upstream channel signal.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: April 22, 2014
    Assignee: ADVA AG Optical Networking
    Inventors: Klaus Grobe, Jörg-Peter Elbers, Michael Eiselt, Markus Roppelt
  • Patent number: 8699871
    Abstract: Method and apparatus for operating for operating an optical network including a shared laser array are disclosed. An example apparatus includes include a first plurality of N lasers. Each laser of the first plurality of N lasers is configured to output a respective optical seed signal having a respective wavelength. The example apparatus further includes a first optical coupler coupled with the first plurality of N lasers. In the example embodiment, the first optical coupler is configured to multiplex the respective optical seed signals of the first plurality of N lasers onto a plurality of N optical fibers. In this example, each optical fiber of first plurality of N optical fibers transmits each of the respective optical seed signals produced by the plurality of N lasers to a respective distribution node for distribution to N respective optical network units, where the optical network units use the optical seed signals to seed respective optical transmitters located at the N optical network units.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: April 15, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Carlo Tosetti, Damiano Rossetti, Alessandro Cavaciuti
  • Publication number: 20140099098
    Abstract: A system and method for fault recovery in a branched optical network. In response to a fault, power distribution in channels on recovering digital line segments is adjusted to minimize a merit function based on one or more system parameters.
    Type: Application
    Filed: March 15, 2013
    Publication date: April 10, 2014
    Inventors: Hongsheng Wang, Dmitriy Kovsh, Lutfur Rahman, Ruomei Mu
  • Patent number: 8693864
    Abstract: An optical network system includes a first node that converts input signals of n systems into optical signals having wavelengths different for each of the systems and wavelength-multiplexes and transmits the optical signals and a second node that selects signals of n systems from the wavelength-multiplexed signals and outputs the signals. The first node includes an optical coupler that divides the input signals into operating system signals and redundant signals, TPNDs that convert the operating systems into optical signals, an optical switch that selects standby system signals from the redundant signals, and a TPND that converts the standby system signals into optical signals in a storage mode corresponding to a type of the standby system signals.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: April 8, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuo Kubo, Takashi Mizuochi, Yuji Akiyama
  • Publication number: 20140037284
    Abstract: The present invention does not require control and path switching by terminal station equipment and prevents the deterioration of signal quality when a cable failure occurs. A wavelength diverging device connected with three or more stations monitors an uplink signal received from each station, and when detecting the absence of an uplink signal received from any station, outputs dummy light instead of the absent signal, performs multiplexing/de-multiplexing for the dummy light and an uplink signal received from a station excluding said any station, and outputs the multiplexed/de-multiplexed signal. All of said processes are performed within the wavelength diverging device.
    Type: Application
    Filed: April 20, 2012
    Publication date: February 6, 2014
    Inventor: Ryuji Aida
  • Publication number: 20140003803
    Abstract: A system for data communication networks and a method for data communication networks, the data communication network including a label switch path, the method comprising the steps of providing a list including a plurality of entries, wherein each entry includes a wavelength that can be used by the label switch path for recovery procedures.
    Type: Application
    Filed: December 15, 2011
    Publication date: January 2, 2014
    Applicant: NOKIA SIEMENS NETWORKS OY
    Inventors: Elie Sfeir, Cyril Margaria
  • Patent number: 8606099
    Abstract: A method and system for protecting integrated optoelectronic devices are disclosed. The method includes (1) providing standby light source links of fixed wavelength and their corresponding standby data channel in a transmitting-end integrated optoelectronic device; (2) detecting whether there is failure in each active light source link in the transmitting-end integrated optoelectronic device; and (3) selecting a standby light source link having a fixed wavelength and its corresponding standby data channel for accomplishing service transmission of failed active light source link and its corresponding active data channel when detecting failure of an active light source link. The system includes a transmitting-end integrated optoelectronic device and a receiving-end integrated optoelectronic device.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: December 10, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yong Duan, Zhihui Tao
  • Patent number: 8600229
    Abstract: The present invention discloses a method and a system for shared protection in WDM loop network. The WDM loop network comprises at least one node, and each node is divided into a multiplexing segment layer, a channel layer and a sub-wavelength layer. The method for shared protection comprises the following steps: A, the multiplexing segment layer, the channel layer and the sub-wavelength layer of each node are detected respectively; B, the detection point generates fault information when at least one of the multiplexing segment layer, the channel layer and the sub-wavelength layer goes wrong; and a controller of each node, according to the fault information, determines the protection control state of the present node and notifies the respective executor; wherein the protection control state includes service adding, service passing through, and service dropping; C, the executor of each node controls the corresponding node to switch to the protection control state determined in step B.
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: December 3, 2013
    Assignee: ZTE Corporation
    Inventor: Kai Ren
  • Patent number: 8554070
    Abstract: A storage device stores information regarding a channel from which an optical transmission apparatus at a subsequent stage drops a signal light. A processor determines that switching from second channel transmission using a larger number of channels than a first number of channels to first channel transmission is performed, and controls an attenuation amount, when performing the first channel transmission using the first number of channels, by referring to the storage device according to the determination and making the attenuation amount in a no-signal channel larger than a determine value if the no-signal channel whose wavelength is within a determined range from the wavelength of the signal light channel for the first channel transmission is a channel from which the optical transmission apparatus at the subsequent stage drops a signal light, so as to transmit an amplified spontaneous emission light along the no-signal channel.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: October 8, 2013
    Assignee: Fujitsu Limited
    Inventors: Taichi Ueki, Shigeru Ishii
  • Publication number: 20130223837
    Abstract: An optical add-drop multiplexer branching unit and its control method are provided according to the present disclosure. The optical add-drop multiplexer branching unit includes: four wavelength division multiplexers WDM1 to WDM4 and a first optical switch module, where WDM1 to WDM4 are configured to divide or combine wavelengths of signals; the first optical switch module is configured to control connection and disconnection of signals that leave and enter the four wavelength division multiplexers; the first optical switch module includes port 1 to port 4; the ports are connected with input ports or output ports of WDM1 to WDM4, respectively; states of internal connection between the ports include state 1 and state 2. The OADM BU in the foregoing solutions is characterized by simple structure, easy control, and high capability of disaster recovery.
    Type: Application
    Filed: March 6, 2013
    Publication date: August 29, 2013
    Applicant: HUAWEI MARINE NETWORKS CO., LTD.
    Inventor: HUAWEI MARINE NETWORKS CO., LTD.
  • Patent number: 8467676
    Abstract: A multi-wavelength optical transmission system includes a plurality of primary optical transmitters, each being configured to provide directly modulated analog optical signals at non-uniformly spaced apart wavelengths. An optical multiplexer having a plurality of optical input ports receives the analog optical signals from each of the plurality of primary optical transmitters and provides a wavelength division multiplexed signal over an optical fiber coupled at an output thereof. A spare optical transmitter is coupled to an input port of the optical multiplexer and, in response to detecting failure of a failed one of the plurality of primary optical transmitters, is tuned to provide a directly modulated analog optical signal at a spare wavelength that is selected as to be non-uniformly spaced relative to at least some of the non-uniformly spaced apart wavelengths according to tuning data.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: June 18, 2013
    Assignee: Cisco Technology, Inc.
    Inventors: Fernando Xavier Villarruel, Kuang-Yi Wu, Fred S. Hirt
  • Patent number: 8463120
    Abstract: A method for realizing service protection in the automatically switched optical network includes following steps: after any defect occurs on the working paths that carry the service, the first node and the last node of the working paths sends the requests to restore the paths setup in opposite directions, respectively; at least one intermediate node in the restoration path establishes a connection according to the restoration path setup request, and forwards the restoration path setup request hop by hop, until the setup of the recovering path is finished; the service is switched from the working paths to the restoration paths. A system for realizing service protection and a node device in an ASON is also provided. The paths restoration process can be faster obviously using this invention, and the restoration time can be shortened, and the work efficiency and reliability can be improved, and the service can be ensured to be restored.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: June 11, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Fatai Zhang, Huiying Xu, Yongliang Xu
  • Patent number: 8457490
    Abstract: Various example embodiments are disclosed. According to an example embodiment, a method may include determining that a transmission of a data signal over a path of a wavelength division multiplexed (WDM) optical network using a group of optical subcarriers is not optically feasible; determining that the transmission of the data signal over the path using a subset of the group of optical subcarriers is optically feasible; activating subcarriers for the subset of optical carriers while deactivating one or more optical subcarriers of the group, at least one deactivated subcarrier provided between at least two activated subcarriers of the group; and transmitting the data signal over at least a portion of the path using the activated subcarriers of the group.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: June 4, 2013
    Assignee: Cisco Technology, Inc.
    Inventors: Maurizio Gazzola, Stefano Piciaccia, Lorenzo Ghioni
  • Patent number: 8428456
    Abstract: The present invention discloses a passive optical network (PON) protection method, a switchover control device, and a PON protection system. In embodiments of the present invention, a protection optical line terminal (OLT) is connected to optical links of at least two working OLTs through the switchover control device; when a working OLT or working optical link fails, the switchover control device replaces the working OLT through the protection optical link, thus ensuring smooth communication. In addition, by using the networking mode of multiple working OLTs and one protection OLT, the embodiments of the present invention greatly saves the networking cost and facilitates the application of the PON technology.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: April 23, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Ruobin Zheng
  • Publication number: 20130089319
    Abstract: The present invention embraces an optical wavelength division multiplex (WDM) transmission system, especially a WDM passive optical network, typically including a central node having a first and a second WDM port and a remote node having a first and a second WDM port and a plurality of channel ports, the central node first WDM port being connected to the remote node first WDM port via a bidirectional single-fiber optical working path and the central node second WDM port being connected to the remote node second WDM port via a single-fiber bidirectional optical protection path, and a group of basic optical node units (ONU's) each of which is connected to a respective remote node channel port via a bidirectional optical ONU path, each ONU including an optical receiver for receiving a downstream optical channel signal and an optical tunable transmitter for creating an upstream channel signal.
    Type: Application
    Filed: December 16, 2011
    Publication date: April 11, 2013
    Applicant: ADVA AG Optical Networking
    Inventors: Dr. Klaus Grobe, Dr.-Ing Jörg-Peter Elbers, Dr.-Ing. Michael Eiselt, Dipl.-Ing. Markus Roppelt
  • Patent number: 8412038
    Abstract: An optical transmission device includes a wavelength multiplexing/demultiplexing unit, a plurality of transponders, an optical switch unit and a controller. The controller includes a table in which a plurality of items at least including priority order, a transmission label, a receiving label and a receiving label expected value correspond to the respective transponders. And the controller rewrites the transmission label of the transponder corresponding to the client device of the lower priority order than the priority order of the client device connected to the transponder of the irregular input, upon the optical signal provided by the wavelength multiplexing/demultiplexing unit to one of the transponders being irregular, and controls the label-changed transponder for which the transmission label has been rewritten so that the label-changed transponder provides the wavelength multiplexing/demultiplexing unit with the optical signal including the rewritten transmission label.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: April 2, 2013
    Assignee: Fujitsu Limited
    Inventor: Hidezumi Natori
  • Patent number: 8401382
    Abstract: The present invention discloses a passive optical network (PON) protection method, a switchover control device, and a PON protection system. In embodiments of the present invention, a protection optical line terminal (OLT) is connected to optical links of at least two working OLTs through the switchover control device; when a working OLT or working optical link fails, the switchover control device replaces the working OLT through the protection optical link, thus ensuring smooth communication. In addition, by using the networking mode of multiple working OLTs and one protection OLT, the embodiments of the present invention greatly saves the networking cost and facilitates the application of the PON technology.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: March 19, 2013
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Ruobin Zheng
  • Publication number: 20130039643
    Abstract: An optical communication system including optical transmission systems each includes a transmission processing unit and a receiving processing unit, wherein the transmission processing unit includes an optical transmission unit that converts electric signals into optical signals, an auxiliary optical transmission unit that converts a part of the electric signals into an optical signal having a wavelength other than wavelengths of the optical signals generated by the optical transmission unit, and outputs the generated optical signal to a different transmission processing unit, and a wavelength multiplexing unit, and the receiving processing unit includes a wavelength demultiplexing unit, an optical receiving unit that converts the optical signals having the wavelengths of the optical signals generated by the optical transmission unit into electric signals, respectively, and an auxiliary optical receiving unit that converts the optical signal having the wavelength of the optical signal generated by the auxilia
    Type: Application
    Filed: April 23, 2010
    Publication date: February 14, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshiyuki Tokura, Katsuhiro Shimizu, Kazuyuki Ishida, Takashi Mizuochi
  • Patent number: 8320757
    Abstract: Schemes are provided for starting up optical transmission links where, after a link interruption, endpoints switch into a startup mode original detection state, and a query-transmit pulse goes out at both end points at given time intervals. In a “TRANSMITTED” handshake mode, in a loop to be passed through n times, and at least once, after the transmission of a transmit pulse, it is detected whether a received pulse is received within a given time span. If no received pulse is received, then the mode is ended and the system is returned to the original detection state. If a received pulse is received, it is answered with another transmit pulse. After the last transmit pulse, if another received pulse occurs within a given time span, the link is activated. If not, the “TRANSMITTED” handshake mode ends and the system enters the original detection state.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: November 27, 2012
    Assignee: ADVA Optical Networking SE
    Inventors: Alfred Schwandner, Oliver Bleck
  • Patent number: 8305881
    Abstract: A method and system for maximizing wavelength reuse in an optically protected wavelength-division-multiplexed (WDM) network, the WDM network supporting a plurality of service connections, includes associating service connections supported by non-overlapping paths to form respective service channel groups, and for each service channel group, assigning at least one common wavelength channel for establishing the service connections. In addition, for each of said groups, at least one common wavelength channel is assigned for establishing a shared protection path for the service connections of each of said groups. In addition, the wavelength channels assigned for establishing the shared protection paths for each of the groups may be used for providing service connections for the WDM network when not in use as shared protection paths. However such provisional service connections are dropped when the wavelength channels are needed to establish shared protection paths.
    Type: Grant
    Filed: August 17, 2004
    Date of Patent: November 6, 2012
    Assignee: Alcatel Lucent
    Inventors: Robert S. Harby, David S. Levy, Dat D. Ngo, James Dorian Sandoz, Charles Small
  • Patent number: 8306422
    Abstract: A Wavelength Division Multiplexed Passive Optical Network (WDM-PON) includes an Optical Line Terminal (OLT) including a first Arrayed Waveguide Grating (AWG) MUX/DEMUX, and a remote node including a second AWG MUX/DEMUX. Each AWG MUX/DEMUX has at least two input ports for receiving a respective wavelength division multiplexed optical signal, and a plurality of output ports. Each output port of the Optical Line Terminal AWG MUX/DEMUX is coupled to a respective transceiver of the OLT. Each output port of the remote node AWG MUX/DEMUX is coupled to a respective PON having at least one optical network terminal (ONT). Respective first and second optical paths are coupled between corresponding input ports of the first and second AWG MUX/DEMUXs. Means are provided for sourcing seed light of the WDM-PON into a selected one the first and second optical paths.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: November 6, 2012
    Assignee: LG Ericcson Co., Ltd.
    Inventors: John Bainbridge, Tom Luk, Giovanni Manto, James Goodchild
  • Publication number: 20120237201
    Abstract: A transmission apparatus includes a processor configured to recognize a number of working failures and a number of protection failures on a network for transmission of wavelength-multiplexed signal light, the number of working failures being the number of failures in signal light in wavelengths at a working entity and the number of protection failures being the number of failures in signal light in wavelengths at a protection entity, configured to perform path switching for each group of signal light in wavelengths that are different from each other and configured to select, when multiple failures occur, restoration processing, on a basis of the number of working failures and the number of protection failures.
    Type: Application
    Filed: February 13, 2012
    Publication date: September 20, 2012
    Applicant: FUJITSU LIMITED
    Inventors: Yasuki FUJII, Ryoichi MUTOH, Toru KATAGIRI
  • Publication number: 20120230672
    Abstract: An optical network element is provided and contains a tunable laser source and a resonator coupled with the tunable laser source. The resonator has a length that determines a distance between modes of the tunable laser source and failures during a mode transition time between modes of the tunable laser source are correctable via error correction measures. Furthermore, a communication system contains such an optical network element.
    Type: Application
    Filed: November 5, 2009
    Publication date: September 13, 2012
    Applicant: NOKIA SIEMENS NETWORKS OY
    Inventor: Erich Gottwald
  • Patent number: 8229258
    Abstract: An optical waveguide-type wavelength domain switch includes a waveguide-type multi/demultiplexing device laminate comprising three or more laminated waveguide-type multi/demultiplexing devices, a lens system positioned on a demultiplex side of the waveguide-type multi/demultiplexing device laminate, and a reflective optical phase-modulating cell positioned on an opposite side of the waveguide-type multi/demultiplexing device laminate to the lens system.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: July 24, 2012
    Assignees: National Institute of Advanced Industrial Science and Technology, Hitachi Cable, Ltd., Keio University
    Inventors: Hiroshi Ishikawa, Toshifumi Hasama, Hitoshi Kawashima, Kenji Kintaka, Masahiko Mori, Hisato Uetsuka, Hiroyuki Tsuda, Keisuke Sorimoto