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| Number | Title | Issue Date |
| 8306427 | WDM transmission apparatus, optical add-drop multiplexer and WDM transmission method There is provided a WDM transmission apparatus including a calculator being operable to calculate an optical signal level of a wavelength after wavelength demultiplexing based on information of OSNR, an amplifier controller being operable to compensate for the optic... | 11/06/2012 |
| 8265485 | Optical transmission system and method for chromatic dispersion compensation An optical transmission system including an optical transmission path for transmitting WDM signals multiplexed different wavelength optical signals, the WDM signals including different bit rate optical signals or different modulation format optical signals; a repeat... | 09/11/2012 |
| 8121486 | Optical transmission apparatus An optical transmission apparatus is arranged by: means for demultiplexing monitoring light for received wavelength-multiplexed signal light so as to detect optical intensity of the monitoring light; means for detecting optical intensity of wavelength-multiplexed si... | 02/21/2012 |
| 7899331 | WDM optical transmission system and optical amplifying apparatus According to a WDM optical transmission system of the present invention, wavelength numbers information of a WDM signal light output from an upstream side optical amplifying unit to a transmission path fiber, and signal output level information thereof are transmitt... | 03/01/2011 |
| 7773886 | Optical regenerator in optical fiber communication system In an optical fiber communication system, the input power to an all-optical nonlinear device in an optical regenerator is monitored and adjusted such that the regenerator operates at an optimized operation point. ... | 08/10/2010 |
| 7725034 | Optical transmision apparatus and control method therefor An optical transmission apparatus comprising a first detector for detecting the power of the supervisory signal light separated from received wavelength-division multiplexed signal lights; a second detector for detecting the power of the wavelength-division multiple... | 05/25/2010 |
| 7715721 | Wavelength assignment in an optical WDM network The path selection and wavelength assignment to a selected path are performed by mapping the wavelength reach to the demand distribution (agile reach) resulting in a 50-60% increase in the network reach. The network reach is further increased (about 2.2 times) when ... | 05/11/2010 |
| 7593640 | Method of dynamically controlling an optical module A method of dynamically adjusting an optical module in an optical system including a plurality of transmission channels includes the following steps: measuring the quality of the optical signal at the output of the system as defined by an error function, varying an ... | 09/22/2009 |
| 7463829 | Optical transmission apparatus and control method therefor An optical transmission apparatus comprising a first detector for detecting the power of the supervisory signal light separated from received wavelength-division multiplexed signal lights; a second detector for detecting the power of the wavelength-division multiple... | 12/09/2008 |
| 7444078 | 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... | 10/28/2008 |
| 7412167 | System and method for limiting the transmission capacity on a data transmission path A system and method are disclosed for providing a transmission capacity on a data transmission path, wherein such data transmission capacity is provided with regard to a user on a transmission path by using at least one limiting unit. ... | 08/12/2008 |
| 7394995 | System and method for a compact optical receiver with wide dynamic range An optical receiver is disclosed comprising an erbium-doped fiber amplifier (EDFA) that is coupled to a photodiode and transimpedance amplifier without filtering output light signal in the EDFA. Optionally, a clock/data regenerator can be coupled to the electrical o... | 07/01/2008 |
| 7391974 | Wavelength division multiplexing optical transmission equipment and method of amplifying optical wavelength division multiplexed signals Optical signal transmission is improved by reducing the variance in light output level and OSNR by adjusting optical signal intensity and gain tilt, taking SRS influence into consideration. ... | 06/24/2008 |
| 7379668 | Optical amplification in photonic switched crossconnect systems An improved photonic switch having optical amplification is described. Signals are amplified before they are switched, after they are switched, or both before and after they are switched. The optical amplification compensates for fixed losses within the switch and t... | 05/27/2008 |
| 7362925 | Control method and control apparatus of optical device The present invention aims at providing a control method and a control apparatus for controlling the operation setting of an optical device with high accuracy, so as to reliably obtain characteristics according to a desired relationship to be set corresponding to a ... | 04/22/2008 |
| 7359587 | Photonic interconnections that include optical transmission paths for transmitting optical signals Various embodiments of the present invention are directed to photonic interconnection architectures that provide high-speed interconnections of microscale or nanoscale devices. In one embodiment of the present invention, a photonic interconnection for interconnectin... | 04/15/2008 |
| 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 |
| 7340165 | Optical amplifying device An optical amplifying device disposed on a transmission path of a WDM signal includes an optical amplifier amplifying the WDM signal, a detecting unit detecting a change in a transmission wavelength count contained in the WDM signal and/or a change in light receivin... | 03/04/2008 |
| 7315696 | Gain setting method in wavelength division multiplex transmission equipment Gain setting of a receiving amplifier, is performed by detecting the necessity of gain setting when a receiving amplifier is turned on, requesting WDM transmission equipment in a preceding station to output ASE light; in a WDM transmission equipment of the preceding... | 01/01/2008 |
| 7302183 | Gain tilt compensators and their systems In the variable gain compensating apparatus, input power of optical amplifiers employed in respective optical repeaters is monitored, and the monitored input power is transferred to a down-stream side by using supervisor (SV) light. In a repeater equipped with a var... | 11/27/2007 |
| 7295780 | Apparatus for detecting peaks of wavelength-division-multiplexed light, and apparatus for controlling said light Disclosed is an apparatus for controlling wavelength-division-multiplexed light wherein overall power of wavelength-division-multiplexed light is rendered constant through control for uniformalizing the level of only one wave of maximum power, and wherein the levels... | 11/13/2007 |
| 7295783 | 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 ... | 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 |
| 7286480 | Method and system for design and routing in transparent optical networks The present invention relates to a method and system for design and routing in telecommunications networks having transparent elements such as photonic switches. Transparent optical networks transmit signals optically, performing both switching and amplification pho... | 10/23/2007 |
| 7280763 | Terminal apparatus and controlling method for optical output power A terminal apparatus by which, even where BER data, for example, of an optical signal of an existing wavelength cannot be utilized, the optical output powers of the existing wavelength and an extension wavelength can be adjusted in a short period of time while elimi... | 10/09/2007 |
| 7269349 | Method of and device for performing bi-directional transmission using a single-wire Two signal lights having different wavelengths are bidirectionally transmitted on an optical-fiber transmission-line. A Raman pump light source generates a first Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the first s... | 09/11/2007 |
| 7268936 | Optical amplifier having polarization mode dispersion compensation function An object of the present invention is to provide at low cost, a highly functional and small size optical amplifier, which realizes a polarization mode dispersion (PMD) compensation function and an optical amplifying function, with a simple construction. To this end,... | 09/11/2007 |
| 7260331 | Optical pulse demultiplexer and method thereof To demultiplex a low-speed optical pulse signal from a high-speed optical pulse signal, an optical clock generator generates an optical clock of a control wavelength λp at a predetermined frequency out of a pulse signal light of a signal wavelength λs. On one side... | 08/21/2007 |
| 7254334 | Multiplex optical communication system A multiplex optical communication system transmitting a multiplex optical signal between terminal equipments each including converters producing optical signals combined to the multiplex optical signal, through repeater equipment including an optical amplifier, unde... | 08/07/2007 |
| 7251071 | Transient control in optical transmission systems In an optical transmission system, operations of certain elements are adjusted in an individualized manner after detecting a change in the total optical power level corresponding to multiple optical channels in a link of the system in order to control transients in ... | 07/31/2007 |
| 7242870 | Wavelength division multiplexing system A wavelength division multiplexing system includes a wavelength division multiplexing transmission path including a multimode optical fiber that is codoped with germanium and fluorine. The wavelength division multiplexing system may further include a multiplexer and... | 07/10/2007 |
| 7239807 | Variable clamp equalization method and apparatus The present invention relates to a variable clamp equalization method and apparatus, the method includes measuring optical signal to noise ratio (OSNR) values for each wavelength, computing a raw power adjustment value for each wavelength, computing a raw power adju... | 07/03/2007 |
| 7233742 | Optical communication system, method for supplying pump light, and distributed Raman amplifying apparatus An optical communication system according to the invention comprises: a transmitting station 11; an optical transmission line 12 for transmitting an optical signal sent from the transmitting station 11; a receiving station 13 for receivin... | 06/19/2007 |
| 7209654 | Optical transmission system A plurality of optical repeaters are provided on a transmission line between an optical transmitting station and an optical receiving station. A combined transmission line section is provided between optical repeaters. The combined transmission line section is compo... | 04/24/2007 |
| 7209663 | Apparatus and method for repeating signal by using wireless optical transmission A repeating apparatus and method using wireless optical transmission is disclosed. The repeating apparatus includes a donor device for transmitting two identical copies of an optical signal by receiving a RF signal from a base station and electro-optic converting th... | 04/24/2007 |
| 7206512 | Method of controlling optical wavelength division multiplexing transmission apparatus A method of controlling an optical wavelength division multiplexing transmission apparatus achieves stable wavelength division multiplexing optical transmission by switching a control mode of an optical amplification section in accordance with an input state of opti... | 04/17/2007 |
| 7187867 | Optical wireless communication system The present invention provides a bilateral communication network system, particularly, a optical wireless communication system communicating information frames via an optical node mounted on a mobile object and a plurality of optical repeaters connected to a wired n... | 03/06/2007 |
| 7187869 | Method for adjusting time delays and device for synchronization of channels in a WDM system The invention is also related to devices for a synchronization of data in an optical WDM transmission system, consisting of the following parts: A wavelength demultiplexer (1) for demultiplexing the incoming data stream in the synchronizer, delay lines (2 | 03/06/2007 |
| 7171124 | Wavelength routing and switching mechanism for a photonic transport network A connection between a source node and a destination node is automatically routed and switched in a WDM photonic network, on receipt of a connection request. A switching and routing mechanism selects a plurality of valid link paths using a path tree, where invalid b... | 01/30/2007 |
| 7158725 | Saturable light absorber structure and a device incorporating the structure for regenerating a wavelength division multiplexed signal The invention relates to a saturable light absorber adapted to receive different focused spectral components, wherein the structure of said saturable light absorber comprises microcavities integrated into a substrate and each associated with a respective one of said... | 01/02/2007 |
