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| Number | Title | Issue Date |
| 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 |
| 7440169 | Method for amplifying a time-varying optical signal and optical amplification unit A method for amplifying a time-varying optical signal comprising the steps of: generating an auxiliary optical signal the amplitude of which is chosen to be complementary to at least the envelope of the amplitude of the optical signal, superimposing the auxiliary op... | 10/21/2008 |
| 7375876 | Optical transmitting apparatus having variable optical transmitting unit including plurality of paths An optical transmitting apparatus includes a variable optical attenuating unit for attenuating signal light variably, an optical amplifying unit for amplifying the signal light, and a looped optical circuit for returning the signal light from the optical amplifying ... | 05/20/2008 |
| 7369300 | Optical amplifier pre-emphasis and equalization method and optical communications system incorporating same The present invention provides an optical amplifier pre-emphasis and equalization method that alleviates the optical amplifier gain ripple penalty experienced in conventional optical communications systems. This method includes storing measured communications channe... | 05/06/2008 |
| 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 |
| 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 |
| 7333736 | Method and apparatus for controlling modulator phase alignment in a transmitter of an optical communications system A method and apparatus for controlling phase alignment in a modulator of a transmitter in an optical communications system utilizes an RF power signature to tune phase alignment. A portion of the optical signal is tapped and converted to an electrical signal. An ele... | 02/19/2008 |
| 7330303 | Wavelength division multiplexed optical amplifier A wavelength division multiplexed optical amplifier, enabling elimination of the problems of oscillation and fluctuation in output due to ASE at the time of a rapid change in the number of input wavelengths, provided with a first-stage optical amplifying unit, secon... | 02/12/2008 |
| 7330651 | Optical amplifying apparatus, optical transmission system and method of adjusting optical transmission loss An optical amplifying apparatus connected mutually through an optical transmission line includes an optical detecting unit for detecting an input level of an amplified spontaneous emission (ASE) light, an optical amplifying unit for amplifying a signal light, and an... | 02/12/2008 |
| 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 |
| 7327958 | Transient-based channel growth for optical transmission systems A channel-growth plan for an optical transmission system selects channels such that the transients that result in the channels that survive a network failure, such as an upstream fiber cut, are either minimized or effectively handled by some transient-control techni... | 02/05/2008 |
| 7324268 | Optical signal amplifier and method An optical amplification apparatus is provided comprising a plurality of fiber amplification media segments which are concatenated in series wherein subsequent to each fiber amplification media segment one or more wavelengths is dropped so as to exploit a gain versu... | 01/29/2008 |
| 7317570 | Variable gain optical amplifiers A variable gain optical amplifier comprises an EDFA for amplifying optical signals at different wavelengths and a pump driver 14 for optically pumping the EDFA to provide optical gain. An input detector 2 is provided for monitoring the power Pin | 01/08/2008 |
| 7310318 | Method and system for using optical phase conjugation in an optical communications network A optical communications network including at least one optical phase conjugator for compensating for non-linear effects. The optical communications network includes at least one dispersion compensation module before the optical phase conjugator and at least one dis... | 12/18/2007 |
| 7302178 | System and method for measuring power of optical signals carried over a fiber optic link A pilot tone generator receives optical energy from an optical communication medium carrying a plurality of optical signals. Each optical signal carries data modulated at a unique wavelength and further modulated with a unique identification signal. The identificati... | 11/27/2007 |
| 7295782 | Control method and optical data transmission path for compensating changes in SRS-induced power exchange Control method and optical data transmission path having a device for determining the tilting of the spectrum, and having a quick control and slow control for compensating the tilting of the spectrum. ... | 11/13/2007 |
| 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 |
| 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 |
| 7236294 | Optical amplifier A contrivance, if a WDM signal state changes, is to improve an optical transmission quality by compensating gain flatness. A first excitation control unit sets a first optical pumping light source unit to emit excitation power needed to get the same amplifying opera... | 06/26/2007 |
| 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 |
| 7227681 | Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied An optical amplifier which amplifies a wavelength division multiplexed (WDM) optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes (a) an optical attenua... | 06/05/2007 |
| 7224514 | Using gain tilt for local compensation of unwanted power gradients A compensator for optical transmission systems exploits gain tilt inherent in optical amplifiers. The amount of SRS induced spectral power gradient is determined, and the amplifier gain is changed to cause a compensating gain gradient in the optical amplifier to com... | 05/29/2007 |
| 7212335 | Apparatus and method for amplification medium performance simulation, and optical amplifier An amplification medium simulation apparatus comprises a basic data retaining unit 21, an input signal beam information retaining unit 22, and a simulation executing unit 31 approximating and calculating an output signal beam power at each signa... | 05/01/2007 |
| 7209284 | Optical amplifier using reflection-type variable optical attenuator for feedback An optical apparatus which is reduced in the number of optical devices arranged on a main optical signal transmission path, thereby reducing the size and cost of the device, and which is improved in optical transmission quality. An optical amplifier includes an ampl... | 04/24/2007 |
| 7202996 | Optical amplifier For setting the optical gain of an optical amplifier such as a Raman amplifier that is connected in a wavelength division multiplexing (WDM) system, the gain of the amplifier is made dependent on the states of optical polarizers connected to individual inputs of a W... | 04/10/2007 |
| 7184410 | Method and system for using optical phase conjugation in an optical communications network including an add/drop multiplexer A method and system for using optical phase conjugation in an optical communications network including an add-drop multiplexer. The method includes determining a position for an optical phase conjugator such that channel quality for a channel in improved above a thr... | 02/27/2007 |
| 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 |
| 7170673 | Optical amplifying repeater apparatus and optical amplifying/repeating transmission system Light signals of first to n-th bands amplified en bloc undergo proper attenuation through an adjustable optical attenuator in conformance with attenuation in an optical fiber connected to input of an optical amplifying repeater apparatus, whereon the light signals a... | 01/30/2007 |
| 7154664 | Apparatus and method for amplification medium performance simulation, and optical amplifier An amplification medium simulation apparatus comprises a basic data retaining unit 21, an input signal beam information retaining unit 22, and a simulation executing unit 31 approximating and calculating an output signal beam power at each signa... | 12/26/2006 |
| 7123404 | Optical amplifier and optical amplification method An optical amplifier includes an output unit that outputs a loss monitoring light having a wavelength that causes neither absorption nor gain with respect to each of the wavelengths of a light signal to be amplified with EDFs; a multiplexing unit that multiplexes th... | 10/17/2006 |
| 7116460 | Modulation control A modulator arrangement for modulating an optical signal using a quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system comprising a laser (2) for producing an optical signal of a selected wavelength... | 10/03/2006 |
| 7116908 | Optical transmission system for substantially equalizing the output signal level among frequency bands and substantially lowering the signal-to-noise ratio In the WDM systems, the OSNR and the signal loss among the optical signals are substantially minimized at the receiving terminal to combat the SRS effects. An equal amount of the signal loss is expected for every span in the transmission path so that the optical amp... | 10/03/2006 |
| 7088496 | Method for controlling a pump unit while optically amplifying a transmitted wavelength multiplex (WDM) signal The invention relates to a novel method for controlling a pump unit of a fiber amplifier, with which a transmitted wavelength multiplex (WDM) signal is amplified by at least a distribution of output powers of a plurality of pump sources in order to achieve a favorab... | 08/08/2006 |
| 7085496 | Passive add/drop amplifier for optical networks and method An add/drop node for an optical network comprises a passive splitter to split an ingress signal from the network into a first ingress signal and a second ingress signal. A first amplified splitter stages module is operable to passively split and amplify the first in... | 08/01/2006 |
| 7081988 | Optical amplifier, communication system and method for control tilt of a communication system The invention discloses an optical amplifier (18) that amplifies signal light in a signal band in a fiber optic transmission system (10) having at least first and second optically pumped signal light gain amplifying stages (30), ... | 07/25/2006 |
| 7081989 | Wide-band fiber amplifier Disclosed is a wide-band fiber amplifier for amplifying C-band and L-band optical signals, including a first amplifying unit including a first amplifying fiber adapted to be (1) pumped in at least one direction (2) amplify both the C-band and L-band optical signals ... | 07/25/2006 |
| 7075710 | Raman amplification method, Raman amplification pumping unit, and WDM optical communication system This invention provides a Raman amplification method and the like having a structure which can properly adjust a pumping light power in accordance with a loss change in signal light and can easily flatten a gain spectrum. In the Raman amplification method according ... | 07/11/2006 |
| 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 |
| 7061670 | Optical fiber amplifier having automatic power control function and automatic power control method An optical fiber amplifier features an optical amplifying section for amplifying an inputted optical signal. A sampling section is provided for shunting part of the optical signal amplified by the optical amplifying section and detecting a first test light belonging... | 06/13/2006 |
| 7061665 | Optical fiber transmission system, raman gain slope measuring device and raman gain slope measuring method In Raman gain slope measurement method and device measures Raman gain slope which is a value obtained by normalizing a gain generated by Raman amplification caused by pump light incident on an optical fiber by optical power of the pump light in question. The method ... | 06/13/2006 |
