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8139286 |
Self-adapting feed forward control apparatus and method in an optical amplifier
A Self-adapting feed forward control apparatus in an optical amplifier includes a feed forward controller for collecting target output power (Pout) and controlling drive current of a pump laser in...
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8077383 |
Optical amplifier
An optical amplifier including: a first amplifying unit amplifying an input light by utilizing a first excitation light and thereby outputting a first amplified light; a second amplifying unit...
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8077384 |
Optical amplifier, and optical transmission system including the optical amplifier
An optical amplifier provided in a repeater station of an optical transmission system is proposed. The optical amplifier amplifies an signal light and performs ALC of output power by means of a...
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7961380 |
Fast power transient supression in constant power-mode controlled optical amplifiers
The specification describes an improved approach to suppressing fast transients in optical amplifier systems. The approach relies on operating the amplifier in an automatic power-mode control with...
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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...
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7864411 |
Optical amplifier, optical amplifier controller and control method of the same
An optical amplifier includes a detecting section configured to detect a part of an input optical signal from a first node on an input side optical fiber; and a rare earth element doped optical...
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7813650 |
Optical system
A system and method for controlling the gain of an optical amplifier receiving one or more optical input signal channels at a first end include a source for generating a gain control signal, which...
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7725042 |
Automated optical transport system
An automated optical transport system is provided which provides for automatic discovery of system components, automatic inventory of system components, automatic topology detection, automatic...
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7657187 |
Optical transmission apparatus and optical transmission control method for wavelength-division-multiplexed optical signal
An optical transmission apparatus for amplifying and relaying a wavelength-division-multiplexed optical signal includes (1) a variation-detecting unit which detects varying speed of input power of...
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7619813 |
Wavelength division multiplexing device, an optical leakage prevention method, and a wavelength division multiplexing communication system
A wavelength division multiplexing (WDM) device, an optical leakage prevention method, and a WDM communication system are disclosed. The WDM device includes a level adjusting unit for receiving an...
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7606488 |
Wavelength-division-multiplexing optical transmission system and control method thereof
In a wavelength-division-multiplexing optical transmission system in which optical-node apparatuses that perform relay transmission of wavelength-division-multiplexed light are located at specified...
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7554720 |
Optical transmission apparatus with automatic gain control and automatic level control mode selection
A transmission apparatus designed to be capable of monitoring faults which occur between the input stage of an optical multiplexer and the input stage of an optical amplifier, appropriately...
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7474459 |
Multi-wavelength light amplifier
A multi-wavelength light amplifier includes a first-stage light amplifier which has a first-light amplifying optical fiber amplifying a light input, a second-stage light amplifier which has a...
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7453628 |
Optical amplifier having wide dynamic range
In an optical amplifier of the invention, a first variable optical attenuator is provided between a fore-stage optical amplification unit and a post-stage optical amplification unit, and a second...
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7400443 |
Method and apparatus for optical amplifying device gain control with gain threshold
Optical amplifying method and apparatus are proposed. Constant gain amplifiers operate such that the output power of the amplifier generally tracks the input power. However, optical systems are not...
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7394590 |
Control device and control method of optical amplifier
There are provided an ASE correction unit which corrects control errors regarding either or both of the gain and the output level of the optical amplifier, which control errors are generated due to...
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7345811 |
Multimode fiber optic amplifier and method of amplifying optical signals
A multimode fiber receiver includes a multimode collimator, a multimode fiber optic amplifier and a detector. The collimator receives incoming signals and provides the signals to the amplifier. The...
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7256931 |
Optical amplifying device
In an optical amplifying device, an optical beam passes multiple times through a grazing-incidence bounce amplifier, accessing different parts (G1,G2) of the gain region on each transit. This...
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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...
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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...
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7202997 |
Optical amplifier and optical amplifier control method
An optical amplifier includes first and second optical amplifier units, a variable optical attenuator optically coupled between the first and second optical amplifier units, a first control unit to...
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7180655 |
Broad-band light source
A broad-band light source has a reduced tendency to oscillate and has high efficiency. The broad-band light source comprises (a) an optical waveguide that comprises a optical active element to...
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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...
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7154664 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
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...
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7139120 |
Optical amplifier with variable gain equalization
An optical amplifier, provided in a WDM transmission system, contains an amplification medium for amplifying WDM light, a measurement part for measuring at least one input optical power of the WDM...
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7068421 |
Raman amplifier and optical relay transmission system
An optical fiber propagates and amplifies a second signal light that is a wavelength-multiplexed signal of a first signal light of a plurality of wavelengths and a reference light that is out of a...
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7068423 |
Low cost flexible automated optical power management
Circuits and systems for use in monitoring and adjusting an optical signal strength of an optical data transmission system. A closed feedback loop which automatically controls an optical device's...
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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...
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7024117 |
Method and apparatus for adjusting tilting and level of optical signals
Pump energy with a wavelength which is below the wavelength of an optical signal is fed into a transmission section from a pump laser via a coupler. The received optical signal is attenuated with...
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6977771 |
Optical amplifier supervisory control method in WDM communication system
The gain control circuit controls the amplification ratio of EDFA based on the results of having measured the input power monitor which monitors the EDFA input optical level which amplifies light...
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6963681 |
Automatic raman gain control
The invention relates to a method for automatic dynamic gain control in optical Raman amplifiers and an optical Raman amplifier adapted for the same. The present invention has found that in...
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6943937 |
Optical amplifier performance controller and method of use
A controller for an optical amplifier and a method for controlling an optical amplifier are disclosed. The illustrative method includes inputting a set-point to a controller; receiving a portion of...
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6922280 |
Optical amplifying apparatus, optical add/drop multiplexer, and optical amplifying method
An optical amplifying apparatus is composed of a light amplifying part for amplifying light and an input light controlling part for inputting, to the light amplifying part, probe light that serves...
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6903324 |
Optical amplifier amplifying wavelength multiplexed light, and wavelength multiplexed light communications system
Wavelength multiplexed light is amplified by first and second EDFs. Gains of the first and the second EDFs are respectively held to be predetermined values by first and second AGC circuits. Between...
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6885499 |
Optical amplifying apparatus for amplifying wide-wavelength-band light, optical sending apparatus, optical transmission system, and optical amplifying method
There are provided a plurality of optical adjusting sections, a wavelength-multiplexing section, and a control section. The plurality of optical adjusting sections, which are provided for...
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6870666 |
Controlling apparatus and controlling method for wavelength division multiplexing optical amplifier
A controlling apparatus and a controlling method for a wavelength division multiplexing optical amplifier to reduce the controlling error due to noise light included in the monitoring light. The...
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6762878 |
Gain control device and method for erbium doped fiber amplifier
This invention provides a gain control device and method for an erbium doped fiber amplifier that is capable of maintaining a constant gain irrespective of the intensity variation of the input...
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6757099 |
Optical power transient control scheme for EDFA amplifiers
An improved optical power transient control scheme is provided for optical amplifiers used in long haul, high capacity DWDM optical networks. The optical power transient control scheme employs a...
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6751014 |
Automatic gain control and dynamic equalization of erbium doped optical amplifiers in wavelength multiplexing networks
A system and method for controlling alignment of laser center wavelengths and filter passband center wavelengths in optical amplifiers for purposes of providing automatic gain control and...
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6738184 |
Optical amplifier for amplifying multi-wavelength light
Optical signals (multi-wavelength light) are guided to an EDF. The EDF is supplied with pump light generated by a first and a second pump light sources. Dummy light is generated by a dummy light...
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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...
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6721091 |
System and method for controlling optical amplifier pumps
A system and method for controlling optical amplifier pumps. A path average intensity detector is provided for detecting a path average intensity for transmitted optical signals. In response to the...
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6707599 |
Optical network equipment with triggered data storage
Optical network equipment is provided. The optical network equipment may include optical amplifiers. Control units may be used to control components in the equipment such as gain stage pump lasers....
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6687049 |
Optical amplifiers with stable output power under low input power conditions
Optical amplifiers and optical network equipment are provided that have optical gain stages for amplifying optical signals on a fiber-optic communications link. The optical gain stages may be based...
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6687045 |
Variable gain optical amplifier and control method
A variable gain optical amplifier and method for control thereof is provided that includes an amplifier stage having a light pump, and a power source for the pump, and a variable optical attenuator...
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6671085 |
Switchable dynamic gain-flattened optical amplifiers and methods with wide dynamic gain range
A switchable dynamic gain-flattened optical amplifier with wide adjustable gain range is provided. Optical signals are amplified through common amplification such that the gain is approximately...
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6657778 |
Optical amplification repeater and optical amplification repeating and transmitting 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...
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6646792 |
Light amplifier and light transmission system using the same
An optical output signal of an optical amplifier 1 branched by an optical divider/splitter 2 is separated by an optical demultiplexor 3 into different paths □1 to □n in accordance with the wav...
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6633430 |
Booster amplifier with spectral control for optical communications systems
An optical amplifier for fiber-optic communications systems is provided. The optical amplifier may have variable optical attenuators for adjusting the power on each of multiple input channels. A...
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6621623 |
Optical fiber amplifying device stabilized for temperature and signal level
An optical fiber amplifying apparatus is provided with an optical fiber for amplifying input signal lights, a heating/cooling element for heating or cooling the optical fiber, and a temperature...
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