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7081986 |
Method and system for controlling amplifier power in an optical communications network having add/drop capability
The invention includes a method for controlling amplifier output power in an optical communications network having channel add/drop capability. A first transmission parameter and a second...
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7079737 |
Devices and methods for dynamic dispersion compensation
The present invention provides devices and methods for dispersion compensation. According to one embodiment of the invention, a dispersion compensating device includes a negative dispersion fiber...
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7079313 |
Optical amplifying apparatus which routes pumping light to a raman amplification medium and a rare-earth-doped optical amplification medium
An optical amplifying apparatus has a plurality of pumping sources generating pumping light beams at different wavelengths, a Raman amplification medium receiving the pumping light beams from the...
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7079311 |
Optical amplifier and optical communication system including the same
The present invention relates to an optical amplifier (TDFA) having a configuration which enables to reduce temperature dependence of the gain with reduced power consumption and simple control. The...
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7079310 |
Gain-clamped optical amplifier
An improved gain-clamped optical amplifier is disclosed. A series of laser cavities are placed along the amplifier axis. The laser cavities are designed such that the carrier densities of the...
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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...
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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...
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7072101 |
Downchirped pulse amplification
An ultrashort pulse amplifier produces high-power ultrafast laser pulses. Pulses first have net negative (i.e. blue to red) chirp applied, and are then amplified in a laser amplifier. After...
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7072100 |
Optical amplifier and gain tilt compensation method
The optical amplifier realizes EDFA amplification of optical signals in new bands (the S + - and S-bands), at wavelengths of 1450 to 1530 nm. The amplifier uses multiple erbium-doped fibers to...
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7068886 |
Millimeter wave oscillator using fiber Bragg grating
Provided is a millimeter wave oscillator for generating a high frequency signal required in wireless communication. The millimeter wave oscillator uses an overwritten fiber Bragg grating and a...
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7068879 |
Gain flattening device for an optical fiber amplifier
A gain flattening device for an optical fiber amplifier. In the gain flattening device, a first end portion, having first and second ends, receives an amplified optical signal from a first...
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7068876 |
Method and system for optical transmission adopting dispersion compensation
An optical fiber transmission line composed of a plurality of segments each having a length falling within a predetermined range is provided. An optical transmitter for supplying an optical signal...
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7068422 |
Optical fiber amplification method and apparatus for controlling gain
Provided are an optical fiber amplification method and apparatus for controlling a gain. Initial values including target gains of first and second amplifications for an optical amplifier amplifying...
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7064888 |
Optical transmission equipment for suppressing a four wave mixing and optical transmission system
There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex...
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7061666 |
Gain and signal level adjustments of cascaded optical amplifiers
An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second...
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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...
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7057802 |
Optical amplifier device
The optical amplifier apparatus comprises an optical amplifier ( 3 ) which amplifies an input signal light, an output detecting unit ( 5 ) which detects an output level of the optical amplifier, an...
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7057801 |
Optical amplifier, transmission system and method for optimization
The invention is related to an optical amplifier connected to a pump laser with lengths of fibers and isolators between the lengths of fibers. The invention is also related to a transmission system...
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7057800 |
Raman amplifying device and raman amplifying system
A Raman amplifying device includes a plurality of Raman amplifiers having a gain wavelength characteristic with a gain peak at which an amplification gain becomes the largest, including a first...
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7054060 |
Raman amplification system utilizing bi-directional pumping
In an optical transmission system utilizing bi-directional Raman amplification, propagation directions and wavelengths of Raman pumps are chosen such that four-wave mixing products among the pump...
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7050658 |
Method and apparatus for reducing system deterioration caused by polarization effects
A method and apparatus for minimizing system deterioration caused by polarization effects (e.g., a polarization-dependent gain (PDG), a polarization-dependent loss (PDL), and a polarization mode...
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7046431 |
Light amplifier and light amplifying method
The present invention relates to a light amplifier capable of obtaining the gain and the noise characteristic required for a direct light amplification repeater in order to keep up with the trend...
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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...
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7046429 |
Method and system for span optical power control
There is proposed a method and a module for real time control of power per optical channel in a multi-channel optical communication line formed by a group of optical elements connected in a chain...
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7042634 |
Optical amplifier
An optical amplifier capable of holding the gain profile of the optical amplifier constant includcs a rare-earth doped optical waveguide serving as an amplification medium, a pump light source for...
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7039269 |
Optical transmission line and optical transmission system utilizing same
An optical signal transmission line includes a first fiber adapted to guide an optical signal therethrough and having a first κ, a second fiber adapted to guide the optical signal therethrough and...
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7038843 |
Method and system for reducing Raman gain tilt error
A method and system in accordance with the present invention greatly reduces the gain error due to Raman gain tilt for individual channels in an optical communication system during a transient...
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7034994 |
Dispersion management for long-haul high-speed optical networks
The dispersion managed solution for long haul, high speed D/WDM systems according to the invention operates on three closely related aspects of the communication system. One is provision of a new...
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7034993 |
Optical amplifier apparatus
The optical amplifier apparatus comprises an optical amplifier which amplifies an input signal light, an output detecting unit which detects an output level of the optical amplifier, an output...
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7031050 |
Method and system for precision cross-talk cancellation in optical amplifiers
The invention provides improved methods and systems for a precise and selective cross-talk cancellation and pilot tones deletion in optical amplifiers. The method for cancellation of cross-talk...
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7027217 |
Optical pulse generator and optical pulse testing instrument and method
An optical pulse testing apparatus incorporating an optical pulse generator composed of low cost components. The optical pulse testing apparatus comprises: a ring optical path including an optical...
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7027216 |
Temperature control in optical amplifier systems to reduce PMD fluctuation
An optical amplifier system is disclosed comprising a span of dispersion compensating fiber (DCF) and a temperature control system. The temperature control system is positioned proximate to the DCF...
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7027215 |
Optical component, optical amplification module, and optical transmission system
The present invention relates to an optical component and others in structure capable of implementing improved compensation for a gain slope. The optical component is equipped with first and second...
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7027214 |
On field upgrade of a flat output optical transmission system
An Optical transmission system ( 10 ) is presented that comprises at least one transmitter ( 12 ), at least one transmission line ( 14 ), at least one optical fiber amplifier ( 18 ), and at least...
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7023612 |
Apparatus and method for upgrading a narrow band optical communication system to a system with wide spectral band optical amplification
An apparatus for optical amplification that imparts to a narrow band optical amplifier, specifically an Erbium dope fiber amplifier (EDFA), gain properties found in wide band optical amplifiers. In...
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7023611 |
Optical equalization with beam counter-propagation
Devices and methods for equalizing the gain of an optical amplifier are described. For devices including harmonic filters that are controllable by amplitude control voltages and phase control...
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7019893 |
Optical dynamic gain amplifier
A dynamic gain equalizer using amplification instead of attenuation is disclosed. The device relies on integrated semiconductor optical amplifiers in line with a demultiplexer on a single...
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7016105 |
Optical amplification device with automatic gain control
A method of automatic gain control for use in an optical amplification device comprising a variable optical attenuator and an optical amplifier connected downstream of the optical attenuator...
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7016096 |
Transmission wavelength characteristics variable optical element, and wavelength characteristics variable apparatus, optical amplifier, and optical transmission system, using same
An object of the invention is to easily realize an optical element using an etalon type structure, capable of changing a periodic transmission wavelength characteristic in an axial direction of...
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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...
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7010183 |
Surface plasmon devices
A device including an input port configured to receive an input signal is described. The device also includes an output port and a structure, which structure includes a tunneling junction connected...
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7009761 |
Power tilt compensation using automatic power balance control
A method for correcting power tilt in an optical signal includes tapping off a representative portion of an optical signal and separating the representative portion into a first signal and a second...
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7006725 |
High extinction ratio fiber interferometer
A high extinction ratio interferometer is disclosed. The interferometer includes a first and second optical fiber each having a first end and a reflective end and an optical coupler for coupling...
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7006280 |
Multi-stage filtered optical amplifier
A multistage amplifier is disclosed for amplifying light over a wavelength band. A first and second span of amplifying fiber are optically coupled and a gain flattening filter (GFF) in-line with...
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7006279 |
Optical harmonic equalization control systems and methods
Devices and methods for equalizing the gain of an optical amplifier are described. For devices including harmonic filters that are controllable by amplitude control voltages and phase control...
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7006278 |
Wavelength-division multiplexing optical transmission system and repeater station therein
Disclosed is a wavelength-division multiplexing optical transmission system in which an optical lossy medium, optical amplifiers and Raman amplifiers for compensating for loss in the optical lossy...
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7002733 |
Methods and devices for amplifying optical signals using a depolarizer
An optical amplification device includes a depolarizer for reducing the polarization sensitivity requirements on an SOA by changing the input to the SOA from having an arbitrary (unknown)...
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6999230 |
Optical transmission equipment for suppressing a four wave mixing and optical transmission system
There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex...
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6993258 |
WDM transmitter
A WDM transmitter comprising an array of M pump lasers multiplexed by an M×N multiplexer, in the form of a coupler, and used to feed an array of N optically pumped fiber lasers emitting at...
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6992817 |
Double pass optical amplifier with unidirectional compensation of chromatic dispersion and obstruction of backscattering
1—“A DOUBLE PASS OPTICAL AMPLIFIER WITH UNIDIRECTIONAL COMPENSATION OF CHROMATIC DISPERSION AND OBSTRUCTION OF BACKSCATTERING”, composed by an EDFA, whose input/output stage is integrated by...
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