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6429963 |
Distributed resonant ring fiber filter
Disclosed is a fiber optic filter that includes a central core, a ring core concentric with the central core, an inner cladding region of refractive index n i between the central and ring cores,...
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6429962 |
Dynamic gain equalizer for optical amplifiers
An optical equalizer for use primarily with an erbium-doped fiber amplifier has an initial polarizer that convert the input beam to a predetermined polarization, followed by a series of...
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6426832 |
Wavelength-multiplexed light amplifying apparatus, optical amplifier and optical add-and-drop apparatus using wavelength-multiplexed light amplifying basic unit
The present invention relates to a wavelength-multiplexed light amplifying apparatus to be used in a state of being connected to a branching portion of a multiplexing/branching unit or to be used...
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6424457 |
Optical amplifiers and methods for manufacturing optical amplifiers
Optical amplifiers and methods for manufacturing optical amplifiers are provided that allow amplifiers to be fabricated to match design expectations. Optical amplifiers may be manufactured by...
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6424456 |
Optical fiber amplifier for clamping and equalizing gain in optical communication system
The present invention is to provide an optical fiber amplifier for clamping and equalizing gain in optical communication systems comprising: a gain clamping amplifier unit for clamping the gain, so...
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6424440 |
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
The first present invention provides an optical switch including the following elements. At least a plurality of optical transmission lines are provided for transmissions of optical signals. Each...
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6421172 |
Long band optical amplifier
The optical amplifier includes a first gain medium having an optical host that contains a rare earth dopant and a first pump that supplies optical energy at a first wavelength into this first gain...
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6421170 |
Gain control and shaping of EDFAs via dual cavity gain control
The present invention relates to an optical amplifier system in which multiple laser cavities are utilized to control the gain of an erbium doped fiber amplifier (EDFA). More specifically, the...
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6421169 |
Optical fiber amplifier having variable gain
An optical amplifier device intended for WDM light signals comprises a preamplifier ( 3 ) and a power amplifier ( 11 ) of the optical fiber amplifier type, which are connected in series and have...
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6421168 |
Reduction of ASE in WDM optical ring networks
The present invention provides a wavelength division multiplexed optical communication system including an optical fiber ring configured to carry at least one wavelength division multiplexed...
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6421167 |
Multiple function bandwidth management systems
Multiple function bandwidth management systems. Bandwidth-management systems for an optical network are easily assembled by concatenating a plurality of intelligent, miniaturized,...
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6417961 |
Optical amplifiers with dispersion compensation
Optical amplifiers are provided that have dispersion-compensating fiber that is pumped with an optical source to produce Raman gain. Removable modules of dispersion-compensating fiber, which may be...
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6417960 |
Method of equalizing gain utilizing asymmetrical loss-wavelength characteristics and optical amplifying apparatus using same
A device for equalizing the gain-wavelength characteristics of an optical repeater used in a long distance optical transmission system, wherein the gain-wavelength characteristics are equalized by...
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6417956 |
Method and an apparatus for amplitude equalization of a plurality of optical signals
In a method of amplitude equalization of a plurality of optical signals having mutually different wavelengths, the optical signals are launched into a first end of an optical fiber ( 5 ). The...
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6414788 |
Optical amplifier system with transient control
Optical amplifiers are provided that use a hybrid transient control scheme. Optical taps may be used to tap the main fiber path through the amplifier before and after the gain stage. The gain stage...
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6414787 |
Optical fiber amplifier having a gain flattening filter
An optical fiber amplifier of the erbium type is intended to amplify light signals within a wavelength band, e.g. in the range of 1540-1555 mm. The active optical fiber receives light signals to be...
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6411432 |
Laser oscillator and laser amplifier
A laser amplifier and/or oscillator comprise a gain medium including rare earth dopant in an host medium. Ions of the rate earth dopant has an energy level structure including a ground level and a...
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6411430 |
Optical amplifier
In an optical amplifier having a plurality of rare earth doped optical fibers in a multi-stage, there are provided one or more optical variable attenuator means, and an attenuation amount control...
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6411429 |
Optical amplifying apparatus, wide-band optical amplifying apparatus, and optical communication system
An optical amplifying apparatus for widening the input dynamic range and lowering noises. The optical amplifying apparatus comprises a first optical amplifier, an optical attenuator, a second...
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6408117 |
Mechanically induced long period optical fiber gratings
By urging an ordinary single-mode (usually dispersion-shifted) fiber into an external, long period mechanical grating, a highly wavelength-selective coupling between the fiber's guiding mode and a...
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6407854 |
Fiber amplifier with fast transient response and constant gain
An apparatus and method are provided for amplifying a signal having several multiplexed channels of different wavelengths. In one embodiment, an amplifier 100 is provided having a doped fiber ...
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6407853 |
Broadhead dual wavelength pumped fiber amplifier
The dual wavelength pumping scheme controls the relative population of the termination state vis-a-vis the metastable state. Praseodymium doped chalcogenide glass and a variety of thulium doped...
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6407836 |
Optical attenuator and system, optical amplifier, and terminal device each having the optical attenuator
The present invention relates to an optical attenuator comprising first and second attenuator units cascaded on an optical path, and a control circuit connected to the first and second attenuator...
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6404540 |
L-band optical fiber amplifier using seed beam
A L-band(long-band) optical fiber amplifier is provided. The L-band optical fiber amplifier includes an optical fiber doped with a rare-earth element, at least one pumping light source for emitting...
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6400499 |
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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6400498 |
Optical signal repeating and amplifying device and optical level adjusting device
Disclosed is an optical signal repeating and amplifying device which has: an optical amplifier which amplifies an optical signal to be input thereto and then outputs it; and an optical filter means...
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6400497 |
Optical fiber amplifier
An EDFA 1 is comprised of a pre-amp 2 and a post-amp 3, which are connected in series, a photocoupler 4, a long wave pass filter (LWPF) 5 and an LWPF controller 6. The photocoupler 4 ...
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6400496 |
Optically amplified WDM transmission system
The problem of gain tilt in an optically amplified WDM system is avoided by using SBS (Stimulated Brillouin Scattering) to limit the power levels of the individual WDM channels at the outputs of at...
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6400475 |
Optical transmission system and optical communications device
An optical transmission unit is comprised of an optical power control unit to adjust the optical power, an optical detection unit to detect the power of the optical signal from a transmission...
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6396624 |
Extended band erbium doped fiber amplifier
An optical amplifier includes first, second and third amplifier stages, a first equalizer coupled between the first and second amplifier stages, a second equalizer coupled between the second and...
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6396623 |
Wide-band optical amplifiers with interleaved gain stages
Amplifiers having multiple gain stages are provided. Some of the gain stages provide gain in a first wavelength band and some of the gain stages provide gain in a second wavelength band. The gain...
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6392790 |
Bi-directional amplifier
A bi-directional optical amplifier arrangement for use in an optical path along which a bi-directional optical signal is travelling, the arrangement comprising at least two amplifier units disposed...
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6392789 |
Erbium-doped optical fiber having gratings formed therein and fabrication method thereof
An erbium-doped optical fiber (EDF) and a fabricating method thereof The erbium-doped optical fiber has a core formed by substantially doping silica with erbium and having gratings formed therein...
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6392769 |
Automatic level control circuit for optical system
Feedback instabilities arising from interactions between automatic control loops at the amplifier nodes of an optical network are eliminated by restricting operation to a single amplifier node at a...
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6388805 |
Two fiber support with single optical amplifier
An optical amplifier for a 4-fiber system having two inputs and outputs is provided that makes use of a single amplifier rather than two separate amplifiers. The optical amplifier node makes use of...
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6388804 |
Optical amplifier
Disclosed is an optical amplifier which is smaller in power consumption and number of component parts, simpler in structure, and rid of wavelength dependency of gain against the variation of input...
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6388803 |
Article comprising a broad band optical amplifier
A broad band optical amplifier includes at least one free space wavelength demultiplexer/multiplexer and optical gain means. The free space demultiplexer/multiplexer receives a multiplexed signal...
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6388802 |
Reduction of ASE in WDM optical ring networks
The present invention improves the performance of optical networks, particularly optical ring networks, by reducing amplified spontaneous emission thereby increasing the available gain of optical...
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6388801 |
Optical amplification apparatus utilizing Raman amplification and controlling method thereof
The present invention aims at providing an optical amplification apparatus for improving noise characteristics by controlling an amplification operation by assuming a noise figure of the overall...
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6384964 |
Optical gain equalizer, and method for producing the optical gain equalizer, and applications of the optical gain equalizer
The present invention effectively compensates gain wavelength dependency of optical amplifiers by a simple method. That is, a value smaller than the minimum value of gain, in the range of usage...
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6384963 |
Optical communication system with co-propagating pump radiation for raman amplification
A fiber Raman amplifier is configured to use a co-propagating Raman pump source, which may be beneficial in a variety of system configurations (for example, in bidirectional communication systems)....
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6381064 |
Method for gain equalization, and device and system for use in carrying out the method
The present invention relates to a method for gain equalization, for example. First, an optical transmission line including an optical amplifier having a gain changing nonlinearly with wavelength...
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6381063 |
Long band optical amplifier
An optical amplifier comprises: a first gain medium having an optical host that contains a rare earth dopant and a first pump that supplies optical energy at a first wavelength into this first gain...
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6377395 |
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 amplifying apparatus which includes an optical amplifier, an optical attenuator and a controller. The optical amplifier amplifies a light signal having a variable number of channels. The...
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6377394 |
Optical amplifier gain control
An optical amplifier comprises: at least first and second amplifier stages, each stage comprising a doped fiber and a pump source for providing pump light to the fiber. The input and output power...
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6377392 |
Optical amplifier
A WDM ring transmission system is provided whereby each optical signal is first dropped from the ring, supplied to an amplifier, and then input to an optical receiver. Typically, a filtering...
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6377391 |
Gain flattening with nonlinear Sagnac amplifiers
An apparatus and a method provide gain flattening in communications systems wherein a large number of optical signals at different wavelengths must be amplified while maintaining signal power...
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6377390 |
Optical gain equalizer, and optical amplifier and wavelength-division multiplex transmitter both comprising the optical gain equalizer
In an optical gain equalizer according to the present invention, a plurality of etalon filters 1 and one ore more fiber gratings 2 or dielectric multilayer filters 3 are arranged in line, and...
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6377389 |
Optical signal varying devices
Optical systems of the present invention include a plurality of optical processing nodes in optical communication via at least one signal varying device. The signal varying devices includes an...
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6373625 |
Method, apparatus, and system for optical amplification
An optical amplifying module having an internal pumping source is provided. WDM signal light obtained by wavelength division multiplexing a plurality of optical signals allocated to different...
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