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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 8055130 | Optical transceiver amplifier Systems and devices for use as optical transceivers and amplifiers in optical networks. An optical transceiver/amplifier has two optical signal circulators, each of which receives one incoming signal and transmits one outgoing optical signal. Each circulator combine... | 11/08/2011 |
| 8009983 | High loss loop back for long repeater span Various high loss loop back (HLLB) repeater architectures are disclosed that enable selectively monitoring (e.g., measuring, analyzing, etc) of Rayleigh signals from both inbound and outbound directions of an optical communication system. In one such embodiment, fir... | 08/30/2011 |
| 7953321 | Optical transmission equipment and optical add-drop multiplexer An optical transmission equipment includes an optical amplifier that is coupled to an optical transmission path and amplifies a first optical signal which is received from the optical transmission path, a first controller that controls the optical amplifier dependin... | 05/31/2011 |
| 7917030 | Fiber optic communication system with automatic line shutdown/power reduction A WDM fiber optic communication system is operative to transmit WDM signals between multiple nodes. Each node has a booster EDFA, and in-band and out-of-band supervisory channels monitoring the integrity of a link by generating and detecting respective in-band and o... | 03/29/2011 |
| 7873274 | 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... | 01/18/2011 |
| 7817917 | System and method for monitoring telecommunications equipment The present invention provides a system and method for monitoring and providing settings to nodes in a telecommunications fiber network. The method and system reviews alarm and threshold settings of nodes and in the network. If the alarm and threshold settings a nod... | 10/19/2010 |
| 7558480 | Unrepeatered optical communication system with suppressed SBS An optical communication system and a communication network are disclosed herein capable of transmitting optical signals with high optical launch power over unrepeatered optical fiber links. A method of transmitting optical signals is also disclosed herein which com... | 07/07/2009 |
| 7526201 | Optical fiber transmission system with noise loading A system and method for loading unutilized channels of a WDM system with noise to improve system performance. A transmitter amplifier may impart noise to unutilized channels by reducing amplifier input or providing feedback of the amplifier output. Noise signals may... | 04/28/2009 |
| 7499648 | Multistage amplifier for rapid acquisition and random received signal power applications A method and apparatus for signal amplification and decision device operation on a signal which has a magnitude, peak value, or other average power that varies over time. In general, a peak detector detects the peak value of a received signal and responsive to the p... | 03/03/2009 |
| 7444077 | Optical transmission system, and pumping light source stopping device and method to be used in same system An optical transmission system includes an optical signal transmitter to output optical signal, a monitoring light transmitter to generate monitoring light, an optical multiplexer to output a multiplexed signal light by multiplexing the optical signal and monitoring... | 10/28/2008 |
| 7440695 | Optical transmission line monitoring system using a gain clamped optical amplifier There are provided a method and system for monitoring an optical transmission line. The system for monitoring the optical transmission line includes: an OTDR (optical time-domain reflectometer) transmitting a monitoring light to an optical transmission line, measuri... | 10/21/2008 |
| 7437083 | Wavelength converter A wavelength converter for binary optical signals includes an interferometer structure (110) for generating an output signal by modulating a received local signal (LS) according to the modulation of a fUrther received first input signal (IS 1). When su... | 10/14/2008 |
| 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 |
| 7430373 | Optical node processor, optical network system and its control method An optimum optical node processor is provided to a metropolitan network in which the distance of a transmission line between each optical node processor is short. The optical node processor according to the invention is provided with an optical add/drop multiplexer ... | 09/30/2008 |
| 7417792 | Optical amplification device An optical amplification device is disclosed that performs feedback control to maintain an amplification gain to be a constant based on measured power of input light and power of output light. The device includes a feedback control coefficient switching unit configu... | 08/26/2008 |
| 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 |
| 7394992 | Control of an optical modulator for desired biasing of data and pulse modulators In an optical transmitter, continuous wave light from a laser passes through a data modulator (DM) for non-return-to-zero (NRZ) encoding of a data stream and through a pulse modulator to add return-to-zero encoding to the modulated optical signal. A modulator contro... | 07/01/2008 |
| 7370253 | Apparatus and method for high-speed SAS link protocol testing An apparatus for changing a connection between two serial components on the same circuit board. The apparatus comprises at least one column, and each column includes first, second, third and fourth pads. The first pad communicates with a first breakout connector dis... | 05/06/2008 |
| 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 |
| 7366416 | Hub for a passive optical network hub A hub for use in a passive optical network (PON) includes a transmission fiber on which an information-bearing optical signal is received, a double-cladded, rare-earth doped fiber located along the transmission fiber for imparting gain to the information-bearing opt... | 04/29/2008 |
| 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 |
| 7336898 | Fibre optic communications network A security system for controlling access to an enclosed conduit along which runs fiber optic cable, the conduit having a cover for access to the cable, the system having a communications receiver and a modulator responsive to an output of the receiver for coupling n... | 02/26/2008 |
| 7330652 | System and method for selecting the placement of optical amplifiers in an optical network A system and method for selecting optical amplifier placement in an optical network is disclosed. In one embodiment, a design tool is used to configure the optical add/drop multiplexers of each nose. For nodes with more than a small number of nodes there are a large... | 02/12/2008 |
| 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 |
| 7321727 | Method for network commissioning using amplified spontaneous emission (ASE) sources This invention provides a method for commissioning an optical network using internal Automatic Spontaneous Emission (ASE) light inherently present in the optical network as a light source (the ASE light source) for measuring losses inside and between nodes in the ne... | 01/22/2008 |
| 7317720 | Signal transmission system A signal transmission system has a master node and plural slave nodes performing data transmission with the master node. The master node has a serial-to-parallel converter for converting a serial data signal from each slave node into a parallel data signal. Each sla... | 01/08/2008 |
| 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 |
| 7308208 | Gain monitoring method for optical amplifier and apparatus thereof An object of the invention is to realize a gain monitoring method for an optical amplifier and an apparatus thereof, capable of detecting a gain for a signal light regardless of a noise light generated inside the optical amplifier. To this end, in the gain monitorin... | 12/11/2007 |
| 7305190 | Optical dispersion correction in transimpedance amplifiers A transimpedance amplifier having adjustment for optical distortion in an optical communication link. The transimpedance amplifier comprises a transimpedance stage and a post amplifier stage, which has a feedback path including an optical distortion adjustment circu... | 12/04/2007 |
| 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 |
| 7266301 | Interference resistant repeater systems including controller units A repeater unit is provided that includes a receiver module and a controller unit. The receiver module is responsive to an infrared signal. The controller unit is adapted to determine whether a signal based on the infrared signal corresponds to a remote control sign... | 09/04/2007 |
| 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 |
| 7248398 | Method for determining the gain spectrum of a Raman amplifier in a WDM-transmission system The invention relates to a method and device for determining the gain spectrum of a Raman amplifier having an optical amplifier, which is connected in incoming circuit thereto, in a section of a WDM transmission system. A number of spectra are recorded at the output... | 07/24/2007 |
| 7248804 | Optical transmission device using a wide input dynamic range optical amplifier Conventionally, an adjustment of an optical power level of an input Pin of an optical amplifier module is made with an optical variable attenuator. An optical coupler for measuring the optical power level of Pin and an optical variable attenuator are replaced by a v... | 07/24/2007 |
| 7245421 | Wavelength-division multiplexing optical communication system In a WDM optical communication system in which an optical lossy medium, optical amplifiers and Raman amplifiers for compensating for loss in the optical lossy medium are cascade-connected, means are provided for acquiring the state of use of a Raman amplifier, at a ... | 07/17/2007 |
| 7242864 | Technique for power control in optical networks A technique for maintaining a required value of power per optical communication channel in a chain of optical nodes (112, 114, 118, 116) connected by optical fiber spans (111, 119, 121), wherein at least some of the nodes include optical amplifiers ( | 07/10/2007 |
| 7242865 | Optical communication system An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission ... | 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 |
| 7236703 | Optical wavelength division multiplexing device As is described above, an optical wavelength division multiplexing and transmission apparatus according to the present invention has the configuration in which a plurality of slave racks coupling to a master rack can be additionally installed one after another with ... | 06/26/2007 |
| 7224899 | Optical transmission system Disclosed herein is a system including a closed loop topology using an optical fiber applicable to WDM signal light obtained by wavelength division multiplexing a plurality of optical signals, and a plurality of nodes arranged along the closed loop topology, each no... | 05/29/2007 |
