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| Number | Title | Issue Date |
| 7440177 | Method and system for improved eye protection safety of high output power lumped optical amplifiers A system and method for providing eye-safety protection during operation of a lumped optical amplifier. The method is based on monitoring of continuous out-of-band Raman amplified spontaneous scattering (ASS) created by the amplified signal in an optical communicati... | 10/21/2008 |
| 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 |
| 7312918 | Optical transmission system having function of correcting noise light due to Raman amplification An optical transmission system wherein a main signal light is amplified by Raman amplification, and noise light (ASS light) produced by the Raman amplification can be corrected with a simple configuration and with high accuracy. The optical transmission system inclu... | 12/25/2007 |
| 7272321 | Passive optical network A passive optical network. The optical network has an optical fiber ring with ends terminating at an optical line terminal. The optical line terminal transmits signals through the fiber ring to optical network units passively connected to the fiber ring. The optical... | 09/18/2007 |
| 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 |
| 7260324 | Automatic optical power management in optical communications system An automatic optical power management system for use with an optical communications system includes a light source residing in a first circuit pack and adapted to emit light at a nominal power level only absent receipt of an indicator signifying a loss of signal res... | 08/21/2007 |
| 7231148 | Flexible open ring optical network and method A flexible open ring optical network includes a plurality of nodes connected by twin or other suitable optical rings. Each node is operable to passively add and passively drop traffic from the rings. The nodes may include a transport element for each ring. The trans... | 06/12/2007 |
| 7218442 | Optical communications system with fiber break detection in the presence of Raman amplification An optical communications system initiates automatic power reduction by selecting a portion of a Raman optical pumping signal from optical signals propagating on an optical fiber span. A signal related to a magnitude of the selected portion of the Raman optical pump... | 05/15/2007 |
| 7215464 | Optical amplifier Optical amplifier which can eliminate the need for an optical detection section before an external attenuating medium, can prevent SN degradation, and can reduce power required for pumping light. An attenuation amount detection section detects an amount of signal li... | 05/08/2007 |
| 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 |
| 7200337 | Optoelectronic transceiver having dual access to onboard diagnostics An optoelectronic transceiver includes first and second controller ICs. Each controller IC includes logic, a memory, an interface, and at least one input port. Each memory is configured to store digital diagnostic data and has a unique serial device address to allow... | 04/03/2007 |
| 7199921 | Two stage optical amplifier The invention describes a system of two-stage optical amplifiers adapted for inserting OADM in the mid-stage, and an integrated assembly designed for implementing the amplifiers in a way suitable for forming bi-directional configurations useful in optical networks. ... | 04/03/2007 |
| 7177074 | Circuit and method for safety shutdown of an optical amplifier A circuit and associated method for safety shutdown of an optical amplifier, wherein the power of an amplified spontaneous emission ASE is subject to a correction factor and subtracted from a measured signal extracted from the optical signal. ... | 02/13/2007 |
| 7173756 | Optical amplification system for variable span length WDM optical communication systems An optical communications system includes a plurality of optical fiber spans. An optical loss of one of the plurality of optical fiber spans is different from an optical loss of another one of the plurality of optical fiber spans. At least one of the plurality of op... | 02/06/2007 |
| 7161734 | Method and apparatus for controlling power transients in an optical communication system A method and apparatus for controlling transients in an optical signal propagating along an optical fiber path interconnecting a plurality of network elements employs a power threshold to determine an appropriate response given a change in optical signal power. ... | 01/09/2007 |
| 7149430 | Optoelectronic transceiver having dual access to onboard diagnostics The optoelectronic transceiver includes first and second controller ICs. Each controller IC includes logic, a memory, an interface, and at least one input port. Each memory is configured to store digital diagnostic data and has a unique serial device address to allo... | 12/12/2006 |
| 7116905 | Method and system for control signaling in an open ring optical network A method and system for control signaling in an open ring optical network includes transmitting traffic in an optical ring. At each of a plurality of nodes along the ring, local traffic is passively added to and passively dropped from the connected ring. At each nod... | 10/03/2006 |
| 7079775 | Integrated memory mapped controller circuit for fiber optics transceiver A controller for controlling a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conversion circuitry for receiving a plurality of analog signals... | 07/18/2006 |
| 7079312 | Optical amplifiers An EDF amplifier comprises two EDF loops separated by optical isolators and pumped with light by pump laser diodes under the control of an output power control system. To achieve the required output power the current supplied to the pump supplying light to the input... | 07/18/2006 |
| 7076128 | Safety procedure for optical fiber systems and safety interface to carry out such safety procedure The invention refers to a safety procedure for optical fiber systems. Such systems are widely used in telecommunication to transport optical signals between a transmitter terminal and a receiver terminal. By the invented safety procedure the optical input power fed ... | 07/11/2006 |
| 7076163 | Method and system for testing during operation of an open ring optical network The method and system for testing during operation of an open ring network includes opening a ring of the network at the node. Traffic circulating on the ring is dropped in the node to a monitoring element prior to or at the opening of the ring in the node. At the m... | 07/11/2006 |
| 7058310 | System and method for protecting eye safety during operation of a fiber optic transceiver A single-chip integrated circuit, sometimes called a controller, controls operation of a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conver... | 06/06/2006 |
| 7058301 | Apparatus and method for planned wavelength addition and removal in a wavelength division multiplexed system A request method for performing optical power management to accomplish planned addition and removal of wavelengths in an optical communications system is disclosed, wherein each wavelength has a path of transmission through the system. The method comprises communica... | 06/06/2006 |
| 7050720 | Integrated memory mapped controller circuit for fiber optics transceiver A controller for controlling a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conversion circuitry for receiving a plurality of analog signals... | 05/23/2006 |
| 7039080 | System and method for proportional control of multiple pump lasers Optical energy is provided to an optical amplifier by a first and a second pump laser. The optical energy that is provided is used as a basis for generating a gain associated with the optical amplifier. An error associated with the first pump laser may be identified... | 05/02/2006 |
| 7031049 | Loss point detecting method and distributed raman amplifier applying the same Power of scattered light separated from an optical transmission path is monitored, part of the excitation light is separated and power thereof is monitored, power of reflected light which passes in a direction opposite to a direction in which signal light passes thr... | 04/18/2006 |
| 7002735 | Method for detecting disengagement of an optical fiber, an optical fiber amplifier, and a unit of an optical fiber amplifier with a transmission optical fiber A method for detecting a connector disengagement of an optical fiber amplifier and a transmission optical fiber connected thereto, the optical fiber amplifier including a doped optical fiber and a pumping light source, and a transmission optical fiber including at l... | 02/21/2006 |
| 6957021 | Optical transceiver with memory mapped locations A controller for controlling a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conversion circuitry for receiving a plurality of analog signals... | 10/18/2005 |
| 6952531 | System and method for protecting eye safety during operation of a fiber optic transceiver A single-chip integrated circuit, sometimes called a controller, controls operation of a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conver... | 10/04/2005 |
| 6944399 | Methods of signal substitution for maintenance of amplifier saturation A method for maintaining amplifier saturation in a wavelength division multiplexed (WDM) optical network having a plurality of sub-bands, each sub-band including at least two signal channels which carry respective data signals, and a plurality of substitute signal t... | 09/13/2005 |
| 6941077 | Memory mapped monitoring circuitry for optoelectronic device Circuitry for monitoring operation of an optoelectronic device having a laser transmitter and a photodiode receiver includes analog to digital conversion circuitry for receiving a plurality of analog signals from the laser transmitter and photodiode receiver, conver... | 09/06/2005 |
| 6917466 | Raman amplifier system, apparatus and method for identifying, obtaining and maintaining an arbitrary Raman amplification performance A Raman amplifier, system and method using a plurality of pumps configured to pump light into an optical fiber so as to Raman-amplify an optical signal propagating through the optical fiber. The Raman amplifier also includes an optical coupler configured to opticall... | 07/12/2005 |
| 6847478 | Optical amplification apparatus using Raman amplification An object of the invention is to provide an optical amplification apparatus using Raman amplification, which can reliably judge an input interruption of signal light and can shut down the supply of excitation light in accordance with a judged input interruption of t... | 01/25/2005 |
| 6724524 | Gain control in Raman amplifiers A Raman fiber amplifier includes: a transmission fiber; at least one optical pump providing optical pump power to the transmission fiber; and at least one pump power detector; at least one signal detector detecting signal power propagating through the transmission f... | 04/20/2004 |
| 6674566 | Raman amplification An optical transmission system comprising a first optical waveguide suitable for transmitting a first information signal, a second optical waveguide suitable for transmitting a second information signal, and input means for providing an electro magnetic r... | 01/06/2004 |
| 6671084 | Optical amplifier An optical amplifier includes an optical amplifying medium having a multiplexed light input thereto and providing an output of amplified multiplexed light, an excitation source which excites the optical amplifying medium; and at least one of a first monit... | 12/30/2003 |
| 6654513 | Path monitoring in optical communication systems An optical communication line having optical fiber amplifiers including a pump laser can be configured to suppress the transmission of optical signals by reducing the power of the pump laser. In order that the portion of the line downstream of the amplifi... | 11/25/2003 |
| 6636348 | Signal break detecting circuit This invention provides a signal break detecting circuit for reducing time required for detecting a data signal break. A difference between an average value of data signal amplified by a limiter amplifier (2) to a predetermined amplitude (output of a full... | 10/21/2003 |
| 6621625 | Optical node including three-stage optical amplifier with automatic gain and level control An optical node and method for operation in an ultra long haul backbone network that provides DWDM optical transmission and wavelength networking functionalities are disclosed. The optical node is designed with capabilities for amplification, dispersion c... | 09/16/2003 |
| 6553159 | Method and system for controlling the output of an optical pump energy source The amplification and noise level of an optical communication signal is controlled by providing a feedback loop to adjust the energy level of an optical pump energy source used to amplify the communication signal. The communication signal is combined with... | 04/22/2003 |
