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7414780 |
All-fiber chirped pulse amplification systems
By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification...
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7411728 |
Devices and methods for raman amplification and dispersion compensation
The present invention provides devices and methods for Raman amplification and dispersion compensation. According to one embodiment of the present invention, a dispersion compensating device...
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7411727 |
Method and an optical amplifier assembly for adjusting Raman gain
A method of adjusting Raman gain in an optical amplifier assembly ( 1 a ). The method comprises inputting a plurality (N) of optical signals (OS) on different wavelength channels to a...
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7400441 |
Optical amplifier, optical amplification repeater and pump light supply control method
There is provided an optical amplifier including a Raman amplification medium, a rare earth doped fiber located at a latter stage of the Raman amplification medium, a first pump light outputting...
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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....
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7394994 |
Optical receiver circuit
An optical receiver circuit comprising an optical converter circuit ( 38 ), comprising a photodiode and converting optical power into electrical power, a sensor circuit for deriving a control...
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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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7391562 |
Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier
The invention provides an optical fiber amplifier which assures stable operation of a pump light source and efficiently makes use of residual pump power to achieve improvement in conversion...
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7391560 |
Multistage optical amplifier having tilt compensation feature
The present invention relates to an optical amplifier and, in particular, it relates to multistage optical amplification having a feature for compensating for the tilt that is generated when a...
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7385754 |
Efficient wavelength referencing in a combined optical amplifier-optical channel monitor apparatus
Efficient wavelength calibration in a WDM optical amplifier that includes an optical channel monitor (OCM) is obtained by introducing a notch into the amplified spontaneous emission (ASE) noise...
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7382525 |
Optical amplification unit with span loss tilt compensation, fiber optical transmission system comprising the same, and corresponding methods
An optical amplification unit comprises at least one optical amplifier for amplifying an optical signal and a filter preceding or following the optical amplifier. The optical amplifier comprises a...
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7379637 |
Method, optical device, and system for optical fiber transmission
The present invention relates to a method for optical fiber transmission which can increase a transmission distance. A first optical fiber having dispersion is first provided. An optical signal is...
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7379235 |
Reducing polarization dependence of a wavelength dispersion variation monitor
Reducing polarization dependence of a dispersion variation monitor includes receiving an optical signal. The optical signal is split into a first polarized signal having first photons and a second...
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7379234 |
Quality monitoring of an optical fiber amplifier
A method is described for detecting aging effects in components of an optical fiber amplifier wherein a broadband signal is amplified by means of a pump source in conjunction with at least one...
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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...
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7371966 |
High speed active flex cable link
A method and apparatus, in some embodiments the apparatus includes a flex cable terminating at a first end and a second end and having a plurality of conductors therein, and a repeater circuit...
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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...
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RE40270 |
Optical amplifying device
An optical brancher branches an input optical signal into two. An optical detector converts one optical signal branched by the optical brancher into an electrical signal. A first controller...
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7366326 |
Real-time implementation of field programmable gate arrays (FPGA) design in hyperspectral imaging
A Field Programmable Gate Arrays (FPGA) design uses a Coordinate Rotation DIgital Computer (CORDIC) algorithm that can convert a Givens rotation of a vector to a set of shift-add operations. The...
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7365903 |
Apparatus and method for all-optical control of gain and gain flattening on an optical amplifier
Provided is an apparatus and method for all-optically controlling both a gain and a gain flattening. The apparatus includes: a first amplifier automatically controlling a gain of the apparatus...
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7359112 |
Individual band gain equalizer for optical amplifiers
A control apparatus comprises a light monitoring unit for dividing a signal wavelength band into at least a band in which output light power of an optical amplifier tends to decrease at an decrease...
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7357521 |
Chromatic dispersion compensation device and method
A chromatic dispersion compensator whereby the amount of dispersion and the group delay time can be easily adjusted. A dispersion unit, a transmitting lens and a group delay generation unit are...
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7355786 |
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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7355785 |
Gain-clamped semiconductor optical amplifier
A gain-clamped semiconductor optical amplifier is disclosed. The amplifier includes a gain waveguide for amplifying an optical signal input to the gain waveguide, and a grating layer, in contact...
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7354772 |
Tag free bio sensing micro strip
A system and method for determining information about an assay. In one embodiment the method includes positioning a filter assembly, having an assay disposed on its surface, relative to a light...
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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...
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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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7342712 |
Filters, including optical filters, having equal group delay ripple and minimized phase non-linearity within their pass bands
The present invention provides an optical telecommunications network that includes at least one of a filter having equal group delay ripple and minimized phase non-linearity which is formed by the...
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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...
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7339725 |
Optical transmission systems including optical amplifiers and methods of use therein
Optical transmission systems including a plurality of optical amplifiers configured to provide optical amplification of one or more information carrying optical signal wavelengths. At least two of...
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7336415 |
Optical amplification module, optical amplification apparatus, and optical communications system
The present invention relates to a practical optical amplification module and the like realizing a wide-band gain spectrum with a small relative gain non-uniformity in L band. Pumping light from a...
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7336414 |
Optical modulating device
An optical modulation apparatus is provided which implements a stable amplifying function by reducing the effect of reflected light rays form end faces of a bidirectional optical amplifier by...
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7333262 |
Optical amplifying method, optical amplifying apparatus, and optical amplified transmission system using the apparatus
A proportional constant adjusting circuit is arranged in the AGC circuit of the optical amplifying apparatus, and the proportional constant of the proportional circuit is continuously adjusted in...
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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)...
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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...
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7319819 |
Suppression of four-wave mixing in ultra dense WDM optical communication systems through optical fibre dispersion map design
The invention is the novel use of dispersion compensation in a long haul wavelength division multiplexed high capacity optical transport system which has very many channels packed extremely closely...
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7289262 |
Optical attenuator element, and variable optical equalizer and optical amplifier that use this optical attenuator element
Instead of using a demultiplexer to divide an optical signal into different wavelengths, this invention uses a plurality of cascade-connected optical attenuator elements whose attenuation factor...
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7286288 |
Method and system for flexible and cost effective dynamic tilt gain equalizer
Method and system for flattening tilt gain with a digital title gain equalizer (“DTGE”) constructed with a linear tilt optical filter (“LTOF”). In a first embodiment, a DTGE flattens tilt...
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7271949 |
Multi-wavelength light source and wavelength division multiplexing system using the same
A multi-wavelength light source includes an amplifier for generating light over a wide wavelength range; and, an optical fiber grating including a plurality of gratings formed on an optical fiber...
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7265898 |
Semiconductor optical amplifier using laser cavity energy to amplify signal and method of fabrication thereof
A semiconductor optical amplifier (SOA) apparatus and related methods are described. The SOA comprises a signal waveguide for guiding an optical signal along a signal path, and further comprises...
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7262904 |
Tunable optical add/drop device
Improved designs of optical devices for processing optical signals with one or more specified wavelengths are disclosed. According to embodiment, a filter mirror assembly appears an “L” shape...
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7262903 |
Method and apparatus for controlling multiple-wavelength-pumped raman amplifier and computer product
A multiple-wavelength-pumped Raman amplifier includes a control unit that controls, based on a relational expression associating an amount of fluctuation in a current signal light power at a signal...
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7256930 |
High power pulse shaping fiber laser for high data rate free space telecommunication systems
An amplified laser source for amplifying a laser projection that includes a diode laser source modulated by a pulse generator applying an alternate high and low voltages higher and lower than a...
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7254334 |
Multiplex optical communication system
A multiplex optical communication system transmitting a multiplex optical signal between terminal equipments each including converters producing optical signals combined to the multiplex optical...
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7254291 |
Optical interferometer
One embodiment of an optical interferometer includes a first MMI device coupled to a second MMI device via a waveguide. The first MMI device separates a first signal into a guided portion and a...
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7253944 |
Multi-stage raman amplifier
A Raman amplifier having at least a first and a second optical Raman-active fiber disposed in series with each other is disclosed. A first pump source is connected to the first Raman-active fiber,...
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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...
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7245423 |
Reducing noise in a fiber amplifier using a cleaning optical signal
A fiber amplifier system and method are provided for reducing noise produced by a fiber amplifier by combining an optical signal to be amplified with a continuous wave optical signal that...
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7239441 |
Raman amplification repeater
A Raman amplification repeater using the amplification function of a signal light caused by Raman scattering which occurs when a pumping light is applied to a transmission path fiber, in which...
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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...
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