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| Number | Title | Issue Date |
| 8081880 | Inline pump sharing architecture for remotely-pumped pre- and post-amplifiers A new transmission link configuration with remote Er post- and pre-amplifiers where pump power is shared between a pair of fibers carrying traffic in opposite directions is proposed. A budget increase of >4 dB is demonstrated. ... | 12/20/2011 |
| 7899334 | Signal distribution module for a directionless reconfigurable optical add/drop multiplexer The present invention provides a signal distribution module for use in a directionless reconfigurable optical add/drop multiplexer application, including: a multi-cast switch having a plurality of input ports and a plurality of output ports; a plurality of optical a... | 03/01/2011 |
| 7792430 | Automatic power restoring method and optical communication system The present invention provides an automatic power restoring method capable of reliably detecting continuity by the dissolution of a line fault, to restore the optical power, even in a structure including an optical amplification medium on an optical transmission pat... | 09/07/2010 |
| 7751720 | System and method for automatic tuning of chromatic dispersion compensation for a WDM transmission system using raman distributed co-pumping System and method for dispersion compensation tuning for a WDM optical transmission system. A tunable dispersion compensation module (4) is located at or substantially close to a transmitting end of the optical transmission line (2) and at least one di... | 07/06/2010 |
| 7522842 | Optical transmission system using Raman amplification A commercially viable All-Raman system, is implemented by removing the dispersion compensating Fiber (DCF) and two stage amplifier at each span, and including a transmission path dispersion compensator which performs dispersion compensation on a transmission path ba... | 04/21/2009 |
| 7418204 | Passive optical network system providing simultaneously both broadcasting service and data service A passive optical network system is disclosed that simultaneously provides both broadcasting service and data service. The passive optical network (PON) amplifies the optical signals for the broadcasting service in an optical amplifier media of the local office by p... | 08/26/2008 |
| 7400830 | Quality monitoring method and apparatus for wavelength division multiplexed optical signal and optical transmission system using the same The present invention has an object to provide a technology for monitoring the quality of a WDM signal light, capable of quickly and accurately judging an occurrence of quality deterioration of signal light and a deterioration factor thereof. To this end, according ... | 07/15/2008 |
| 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 |
| 7379677 | Method of wavelength conversion and wavelength converter The wavelength converter comprises (1) an optical multiplexer for multiplexing an amplitude-modulated first light and reference light, which is continuous light having a wavelength different from the wavelength of the first light, (2) an optical fiber for propagatin... | 05/27/2008 |
| 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 |
| 7355787 | Optical transmission system and optical filter assembly for submarine applications An optical amplifier assembly for submarine applications. The optical amplifier assembly comprises: a first and a second double stage fiber amplifier with respective first and second fiber amplifiers for amplifying optical signals (OS, OS′) each propagated on a re... | 04/08/2008 |
| 7346280 | Bi-directional long haul/ultra long haul optical communication link A bi-directional configuration is employed to implement a hybrid ultra long haul (ULH)/long haul (LH) optical transmission system. The link carries ULH channels and LH channels in opposite directions in different bands. Raman amplification is employed for the ULH ba... | 03/18/2008 |
| 7336908 | Optical transmission system using optical signal processing in terminals for improved system performance An optical communication system configured to operate with optical signals at lower signal to noise ratios than previously contemplated. The communication system includes a receiver having an optical pre-processor coupled between a demultiplexer and a detector. The ... | 02/26/2008 |
| 7330302 | Optical transmission system This invention provides an optical transmission system which allows to perform high-quality transmission of each of a plurality of signal channels multiplexed. In the optical transmission system, signal light in which a plurality of signal channels with an optical f... | 02/12/2008 |
| 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 |
| 7277636 | Optical communication apparatus and methods using pulses having modified propagation speeds An improved apparatus and method for enhancing the performance of optical transmission and network systems (such as SONET or SDH). A magnetically trapped atomic cloud chamber is provided which selectively alters the group velocity of light waves propagating through ... | 10/02/2007 |
| 7272316 | Wavelength-division-multiplexed optical source and passive optical network system employing the same A WDM optical source, in adopting a spectrum-sliced method, advantageously needs neither an optical source with specific generation wavelength nor a wavelength-stabilizing circuit for stabilizing wavelength. Affording high power and a very narrow line width, the WDM... | 09/18/2007 |
| 7272327 | Multi-detector detection of optical signals Use in an optical communications system of multiple detectors to separately detect respective multiple spectral modes of a received optical signal. The invention also provides for corresponding multi-channel, dispersion-tolerant optical receivers. Embodiments are pr... | 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 |
| 7228076 | Method for remodulation of a modulated optical signal and device for remodulation and transmission system A method for remodulation of a modulated optical signal is disclosed which uses a disturbed line signal and an optical clock signal derived from the undisturbed original line signal modulated with the bitrate frequency feeding both signals in a Raman amplifying fibe... | 06/05/2007 |
| 7224858 | Optical transmission network with a receiver photonic integrated circuit (RxPIC) utilizing an optical service chanel (OSC) An optical receiver photonic integrated circuit (RxFIC) comprises a semiconductor monolithic chip having an input to receive from an optical transmissior link a combined channel signal originating from an optical transmitter source and comprising a plurality of chan... | 05/29/2007 |
| 7208722 | Measuring method and measuring apparatus for coherent crosstalk light An apparatus for measuring coherent crosstalk (CXT) light of the invention generates in a light source section, measurement light which has been modulated to a sawtooth wave shape and applies this to an object of measurement; sends transmission light and CXT light e... | 04/24/2007 |
| 7203429 | Optical transmission system using optical signal processing in terminals for improved system performance An optical communication system configured to operate with optical signals at lower signal to noise ratios than previously contemplated. The communication system includes a receiver having an optical pre-processor coupled between a demultiplexer and a detector. The ... | 04/10/2007 |
| 7200333 | Optical communication apparatus, system, and method that properly compensate for chromatic dispersion An optical communication apparatus performs wavelength division multiplexing with respect to signals of a plurality of signal transmission bands. The apparatus includes a first optical unit which effects distributed Raman amplification and has a characteristic that ... | 04/03/2007 |
| 7194205 | Optical transmission apparatus and optical systems An optical transmission apparatus, an optical repeater using the optical transmission apparatus, and an optical cross-connect equipment for controlling switches depending on supervisory information, comprising: a doped fiber for amplifying an optical signal of wavel... | 03/20/2007 |
| 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 |
| 7155078 | Optical transmission network with transmitter photonic integrated circuit (TxPIC) utilizing an optical service channel (OSC) An optical transmitter photonic integrated circuit (TxPIC) comprises a semiconductor monolithic chip with a plurality of optical signal channels where each channel comprises a modulated signal source. The output from the modulated signal sources are coupled to an in... | 12/26/2006 |
| 7155131 | Optical communication devices, light emission devices and optical communication methods The invention relates to optical communication devices, light emission devices and optical communication methods. Aspects of the present invention provide methods and devices enable provision of modulated output optical signals without providing modulation of total ... | 12/26/2006 |
| 7130505 | Optical performance monitor An optical performance monitor for accurate monitoring of the OSNR of a WDM optical signal is provided wherein a demultiplexing arrayed waveguide grating (AWG) having a plurality of Vernier input ports is disposed between an optical switch and a photodiode array cou... | 10/31/2006 |
| 7130537 | Safety shutdown system for a WDM fiber optic communications network A fiber optic communications network includes multiple transmitters and multiple receivers connected by an optical WDM transmission link, the receivers having output channels for providing signals to terminal devices, each receiver including a demodulator to detect ... | 10/31/2006 |
| 7103285 | Optical transmission system for reducing nonlinear optical phenomena using modulation depth control system An optical transmitter enables output of high-power light signals while effectively suppressing occurrence of the nonlinear optical phenomena, particularly, SBS, and an optical communication system provided therewith. The optical transmitter comprises a modulation s... | 09/05/2006 |
| 7099593 | Self-synchronization of an optical packet network using seed pulses extracted from within the packets A method and system for self-synchronizing an optical packet network by selecting a seed pulse from among the data pulses within a packet having no synchronization marker, transforming the seed pulse to be optically distinguishable from the remaining data pulses aft... | 08/29/2006 |
| 7099072 | Direct optical modulation type wavelength converter A direct optical modulation (DOM) type wavelength converter is provided. The provided wavelength converter is a gain-clamped semiconductor optical amplifier (GC-SOA), which does not require a continuous wave (CW) signal, or a semiconductor laser in itself, and reduc... | 08/29/2006 |
| 7092636 | Optical network employing erbium-doped fiber amplifiers A point-to-multipoint bi-directional wide area telecommunications network employing atmospheric optical communication. The network comprises a primary transceiver unit, a plurality of subscriber transceiver units and an optical router. The primary transceiver unit m... | 08/15/2006 |
| 7072585 | Per-channel optical amplification using saturation mode An optical communication system includes a plurality of optical channels, each of which passes a single optical wavelength signal. Each of the plurality of optical channels includes an optical amplifier which is controlled to operate at a predetermined output power ... | 07/04/2006 |
| 7046428 | Raman amplifier Raman amplification pumping light output from a pumping light source unit is supplied to a Raman amplification optical fiber through an optical circulator. The remaining Raman amplification pumping light is detected by a light-receiving element through an optical ci... | 05/16/2006 |
| 7046430 | Optical transmission systems including signal varying devices and methods Optical systems of the present invention include a plurality of optical processing nodes in optical communication via a plurality of signal varying devices. A first signal varying device includes an optical fiber configured to produce Raman scattering/gain in a sign... | 05/16/2006 |
| 7034996 | Optical transmission apparatus An optical transmitter 11 outputs an optical signal, and an optical booster amplifier 12 amplifies the optical signal and sends the amplified optical signal to an optical fiber 101 forming an optical transmission line. When detecting an optical ... | 04/25/2006 |
| 7035505 | Optical performance monitor An apparatus for monitoring an input optical signal at a plurality of distinct optical frequencies is disclosed wherein a demultiplexing arrayed waveguide grating (AWG) having a plurality of M>1 Vernier input ports is disposed between an optical switch and a photodi... | 04/25/2006 |
| 7010229 | Optical transmission systems including optical amplifiers and methods Optical transmission systems of the present invention include at least one optical amplifier generally including an optical signal amplifying medium supplied with pump power in the form of optical energy in via an optical pump source. The pump source includes multip... | 03/07/2006 |
