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| Number | Title | Issue Date |
| 8139951 | Fiber-optic long-haul transmission system An ultra-long fiber-optic transmission system is configured in accordance with the current telecom standards and particularly advantageous for transmission data at a long distance which may exceed 400 km between adjacent nodes. The disclosed system has at least one ... | 03/20/2012 |
| 8041231 | Supervisory controlling method and supervisory controlling system of optical repeater The present invention aims at providing a technique capable of supervising and controlling optical repeaters, without affecting transmission characteristics and wavelength bands of signal lights, by utilizing the Raman effect. To this end, the present invention prov... | 10/18/2011 |
| 8036538 | Method and optical amplifier for laser safety protection and method for loading identification signal A method for laser safety protection in an optical communication system includes: a downstream station detecting whether an identification signal loaded by an upstream station on a main optical channel in a direction from the upstream station to the downstream stati... | 10/11/2011 |
| 7711271 | Wave division multiplexed optical transport system utilizing optical circulators to isolate an optical service channel The invention provides for optical circulators which redirect light from port to port sequentially in one direction used to separate traffic in a bidirectional optical fiber transmission system. The invention provides for using two optical circulators in each span o... | 05/04/2010 |
| 7689131 | WDM system A WDM system includes a plurality of P to P WDM systems connected for wavelength-multiplexing optical signals of a plurality of wavelengths, transmitting them to a transmission path, transmitting wavelength-division multiplexed light while performing amplification b... | 03/30/2010 |
| 7684711 | Pulsed high loss loop back signalling scheme An optical transmission system comprises two optical fibers carrying optical signal traffic between two terminals, and a plurality of optical repeaters coupled to the two fibers each repeater having a permanently connected passive high loss loop back circuit between... | 03/23/2010 |
| 7676160 | Supervisory controlling method and supervisory controlling system of optical repeater The present invention aims at providing a technique capable of supervising and controlling optical repeaters, without affecting transmission characteristics and wavelength bands of signal lights, by utilizing the Raman effect. To this end, the present invention prov... | 03/09/2010 |
| 7437070 | Submarine observation apparatus and submarine observation system In each of a plurality of submarine observation apparatus (1 to n), a branching unit (63) branches fixed-wavelength light (λ1) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit (64) modulates the... | 10/14/2008 |
| 7426347 | Shared optical performance monitoring An apparatus for shared optical performance monitoring (OPM) is provided. A wavelength sensitive device receives light at an input port and routes it wavelength selectively to a set of output ports. To perform optical performance monitoring on the output ports, a mo... | 09/16/2008 |
| 7421207 | Single fiber duplex optical transport The invention pertains to optical fiber transmission systems, and is particularly relevant to optical transport systems employing optical amplifiers. In particular the invention teaches an apparatus and method that allows cost effective co-directional operation of a... | 09/02/2008 |
| 7400440 | Method and system for determining gain for an optical signal A method for determining gain for an optical signal includes measuring a first power level that is an output power level of an optical signal at a first optical node, communicating the optical signal to a second optical node, and communicating the first power level ... | 07/15/2008 |
| 7369779 | Regeneration of optical phase modulated signals A regenerator for restoring the originally encoded optical phase of a differential-phase-shift-keyed signal. In an embodiment, the regenerator simultaneously provides limiting amplification and reduces amplitude noise based on a phase-sensitive optical amplifier tha... | 05/06/2008 |
| 7339723 | Optical transmission system, optical repeating apparatus, and quality supervising method An optical transmission system includes an optical fiber transmission line, one or more optical repeating apparatuses, an optical receiving apparatus, and a transferring route for transferring a supervisory signal based on a quality deterioration of an optical signa... | 03/04/2008 |
| 7340133 | Configurable dispersion compensation trimmer The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of large volumes of data over long distances at high rates. An improved apparatus achieving precise dispersion compensation in a fiber span is disclosed. In pa... | 03/04/2008 |
| 7327954 | Optical signaling to share active channel information A method for optical supervisory signaling includes determining a wavelength channel status (WCS) value, a wavelength channel failure (WCF) value, and a wavelength channel lit (WCL) value for each one of multiple data channels services by an optical communication no... | 02/05/2008 |
| 7327745 | Packet transmission system and a terminal apparatus A packet transmission system is disclosed. The system serves between terminal apparatuses that include a supervisory control circuit configured to transmit a supervisory signal in a direction opposite to the transmission direction of a main signal on each of and bot... | 02/05/2008 |
| 7327960 | Receiver transponder for protected networks A receiver transponder to be used in an optical add and drop multiplexer connected in short haul type networks receives light signals from two opposite directions on input fibers (21, 23). The optical input signals are converted to electrical signals by O/E c... | 02/05/2008 |
| 7317755 | Predicted parallel branch slicer and slicing method thereof A predicted parallel branch slicer for use in an adaptive decision feedback equalizer includes Mk adders commonly receiving a signal to be processed and respectively receiving Mk preset values, and performing respective addition operations to g... | 01/08/2008 |
| 7295776 | Optical LAN device An ring type optical LAN device includes a master node and a plurality of slave nodes that are interconnected by an optical fiber cable. A plurality of optical bypass transmission lines are provided in correspondence with each one of the slave nodes. Each of the opt... | 11/13/2007 |
| 7289740 | WDM regenerated transmission system A multichannel wavelength-division multiplex fiber optic transmission system includes an optical transmitter and an optical receiver connected by an optical line including at least one optical fiber and at least one set of channel regenerators. Successive regenerato... | 10/30/2007 |
| 7277648 | Network element for use in an optical communication network, in particular a DWDM communication network The present invention relates to an optical communication network and to a network element for use in such a network. The network element comprises a plurality of receivers (70-76) for receiving optical communication signals, a plurality of transmitter... | 10/02/2007 |
| 7266145 | Adaptive signal equalizer with adaptive error timing and precursor/postcursor configuration control An adaptive signal equalizer with a feedforward filter in which the feedback error signal and corresponding incoming data signal are dynamically aligned in time using signal interpolation, and further, to control the precursor/postcursor filter taps configuration, t... | 09/04/2007 |
| 7254339 | Power controlling network element A power controlling network element for a communication system includes a detector for measuring radiation power present in components of radiation; element parts, for example a channel control unit (CCU), transponders and other modules, for at least one of: (i) tra... | 08/07/2007 |
| 7248799 | Method and an improved device for controlling the power delivered at the output of a node of an optical network that switches bands of wavelengths A device (D) is dedicated to controlling the power of optical signals in a transparent switching node of an optical communication network that switches bands of wavelengths. The device includes, firstly, a controller (12) for comparing input optical power mea... | 07/24/2007 |
| 7202995 | Method and apparatus for communicating status in a lightwave communication system employing optical amplifiers A repeater node for an optical transmission system provides amplification of optical signals and uses a modulated pump signal to transfer status information about the repeater node to a control system via an optical supervisory signal. The pump signal supplied by a ... | 04/10/2007 |
| 7187862 | Method of locating faults in optical telecommunication networks A method, a system and a module are proposed for detecting and locating faults in an optical multi channel network composed of network nodes. The method includes assigning different sub-carrier pilot tones to a number of the nodes comprising Network Elements (NE), a... | 03/06/2007 |
| 7174108 | Transmission device and repeater A transmission system is provided that recognizes occurrence of a fault efficiently so that the workability and quality of service can be improved. An optical amplifier part amplifies an optical main signal. A fault occurrence recognizing part detects a pump light u... | 02/06/2007 |
| 7167652 | Optical transmission system constructing method and system An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the op... | 01/23/2007 |
| 7158289 | Method and apparatus for implementing optical supervisory channel using broadband noise modulation Method and apparatus for implementing optical supervisory channel using broadband noise modulation are described. One embodiment of the present invention is a system for transmitting a supervisory channel from an optical fiber amplifier. The system comprises a first... | 01/02/2007 |
| 7158728 | Optical repeating system and optical amplifying repeater control method An optical repeating system includes an optical transmitter and a plurality of optical amplifying repeaters. The optical transmitter specifies a part or all of the optical amplifying repeaters, and transmits a supervisory command to the specified optical amplifying ... | 01/02/2007 |
| 7151630 | Raman amplification repeater A repeater according to the present invention includes a plurality of excitation light sources with varying center wavelengths for use as an excitation light source to achieve Raman amplification; and comprises a flatness monitoring circuit which monitors the flatne... | 12/19/2006 |
| 7151895 | Method and system for automatically setting gain for an amplifier in an optical network A method for automatically setting a gain for an amplifier in an optical network includes transmitting, from a source proximate an upstream amplifier coupled to an optical span, a stable signal over the optical span. The method also includes using the stable signal ... | 12/19/2006 |
| 7149975 | Optical network administration graphical user interface This invention provides an improved graphical user interface (GUI) for optical network administration. The GUI allows a user to view a network topology in which only those nodes at which channel traffic may be added to and/or dropped from a muxed signal are displaye... | 12/12/2006 |
| 7146101 | Optical media management channel A network management communication infrastructure is provided that supports in-fiber signaling amongst the network components residing in an optical transport network. The network management communication infrastructure introduces an optical media management channel... | 12/05/2006 |
| 7146100 | Repeater and Raman amplification repeating system A Raman amplifier repeater comprising a Raman excitation light production/answer signal superimposition unit for producing a first reply signal for a down-direction line with respect to a monitor control command, an answer signal production unit for producing a seco... | 12/05/2006 |
| 7139479 | Method and apparatus for optical network administration An optical transmission network allows transmission monitoring zones to be set up or changed in a flexible manner, and allows simultaneous monitoring of communication quality for each of these monitoring zones. Also, provided is an optical transmission zone service ... | 11/21/2006 |
| 7139480 | System and method for power management in an optical network A method and system for multi-level power management in an optical network is provided. They include three levels of power management. The first level of power management dynamically changes equipment settings in each module of equipment so that required module setp... | 11/21/2006 |
| 7133611 | Main signal controlling apparatus and method in a WDM optical communications system If a repeater supervisory control (SV), a pre-emphasis automatic adjustment (PE), a receiving side threshold value automatic adjustment (Vth), a transmitting side dispersion compensation value setting (VDC(T)), and a receiving side dispersion compensation value sett... | 11/07/2006 |
| 7130544 | Optical repeating system and optical amplifying repeater control method An optical repeating system includes an optical transmitter and an optical amplifying repeater. The optical transmitter transmits a supervisory command and a control command to the optical amplifying repeater as a first sub-signal. The supervisory command is a comma... | 10/31/2006 |
| 7113701 | Optical packet routing network system based on optical label switching technique An optical communication equipment comprises shared optical sources 88a–88d to be shared by communication nodes 100a–100d, the wavelengths of optical signals 76a–76d are conver... | 09/26/2006 |
