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6373622 |
Optical amplification apparatus
An optical amplification apparatus for adjusting optical power of wavelength-multiplexed signal light at respective wavelengths and for adjusting the optical output power at the respective...
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6369938 |
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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6366395 |
Optical amplifier gain control
An optical amplifier comprises a pumped doped fiber with a power measurement circuit for measuring the input and output power of the amplifier. Automatic gain control is implemented, and the...
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6366393 |
Fast gain control for optical amplifiers
In an optically amplified wavelength division multiplexed (WDM) system having a WDM signal comprising a plurality of optical channels, the per-channel gain of the optical channels is kept...
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6362917 |
Optical amplifier
An optical amplifier comprises an erbium doped optical fiber ( 2 ) and a plurality of optical filtration elements ( 12 ) provided at respective positions along the fiber. The wavelength response of...
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6362916 |
All fiber gain flattening optical filter
An all fiber optical filter is formed by stretching an optical fiber. The all fiber filter includes a core, an inner cladding and an outer cladding. A core index of refraction is greater than an...
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6359727 |
Optical amplifier for wavelength-multiplexing transmission
In an optical amplifier for wavelength-multiplexing transmission of this invention, signals of a plurality of wavelengths in a 1.55-μm wavelength band, which is input to an input terminal,...
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6359726 |
Wavelength division multiplexing optical amplifier with function of gain-equalizing and optical communication system
An object of the invention is to provide a WDM optical amplifier and an optical communication system which can ensure wavelength flatness for gain across a wide range of input light power levels,...
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6356386 |
Method and apparatus for stabilizing transient control in amplified optical networks
An apparatus and method are described for controlling response to power transients in an optically amplified wavelength division multiplexed (WDM) network when WDM optical channels are added and...
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6356385 |
Inhomogeneous broadening to modify the gain of an optical amplifier
An optical amplifier has a gain profile which is substantially flat and independent, over a wide range, of the pump power, power of the input signals, and the number of input signals. The amplifier...
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6347008 |
Optical amplifier system and optical network having flattened gain and constant per channel output power
An optical network and an optical amplifier system provide flattened gain, constant per channel output power, and compensation for variable span losses. The optical amplifier system is disposed in...
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6347007 |
Semiconductor laser high power amplifier system
A high power laser optical amplifier system for material processing comprises multiple stage fiber amplifiers with rejection of propagating ASE buildup in and between the amplifier stages as well...
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6347006 |
Control for periodic optical filter
The present invention relates to an apparatus for generating a control signal for at least one periodic filter arranged to filter the optical profile of a signal, at least one of the phase and the...
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6344924 |
Optical fiber amplifier and output power flattening method of optical fiber amplifier
Optical fiber amplifiers with a simple composition than can accurately flatten optical output power in a fixed range are provided. Main optical amplifiers and first gain equalizers connected to...
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6342966 |
Crosstalk suppression in a multipath optical amplifier
A multi-amplification path optical amplifier including a first amplification path for propagating and amplifying a first in-band optical communication signal, including a spectrally selective...
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6342959 |
Transient suppression in an optical wavelength division multiplexed network
An optical level controller ( 13 ) for a wavelength division multiplex optical communication network ( 17 ) includes one or more variable gain elements ( 1;9 ) adapted to suppress transient...
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6342958 |
Wavelength division multiplexed transmission system and transmitting method using the same
A wavelength division multiplexed transmission system and a transmitting method using the same are provided. The wavelength division multiplexed transmission system includes a transmitting optical...
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6341034 |
Optical amplifier system with transient control using spectrally filtered input
Optical amplifiers are provided for use in fiber-optic communications networks. An optical amplifier may be controlled to prevent gain transients. The optical amplifier may use a...
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6341033 |
Performance gain flattened erbium-doped fiber amplifiers
The invention is directed to a multistage optical amplifier having a gain stage between two gain flattening filters. According to illustrative embodiments, a gain flattened optical amplifier system...
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6341032 |
Method and system for reducing optical surge
The method and system are disclosed for reducing an optical surge in an optical data communication system that includes at least pair of optical lines, optical switches and optical amplifiers to...
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6339495 |
Optical amplifier with power dependent feedback
An optical amplifier includes an optical feedback resonant laser cavity (OFRC) including a power dependent loss element (PDLE) having the characteristic that as the incident laser power on the PDLE...
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6339494 |
Gain flattened optical fiber amplifier
An optical fiber amplifier capable of having a flattened gain irrespective of the intensity of an input signal light. The optical fiber amplifier includes a first amplifying unit for amplifying an...
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6337764 |
Optical fiber amplifier for controlling gain flatness
An optical fiber amplifier for controlling gain flatness including an optical fiber amplifying unit for amplifying input signal light according to a predetermined amplification control value, a...
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6337763 |
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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6335941 |
Semiconductor laser highpower amplifier system
A high power laser optical amplifier system for material processing comprises multiple stage fiber amplifiers with rejection of propagating ASE buildup in and between the amplifier stages as well...
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6335822 |
Double cladding fiber and optical fiber amplifier
A double cladding fiber and an optical fiber amplifier, which have a function equivalent to that of a pumping light cut filter with a simple structure are provided. In the double cladding fiber, a...
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6335821 |
Optical fiber amplifier and a method for controlling the same
According to the present invention, an optical fiber amplifier is provided, including: an erbium-doped fiber to which a multiplexed optical signal into which a plurality of optical signals in a...
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6330117 |
Optical isolator module and optical amplifier using the same
An optical isolator module in which an optical splitter for splitting an optical signal input through an input port, an optical detector for detecting the separated light, and a compensator for...
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6330105 |
Double-pass fully isolated broadband optical signal source for fiber optic interferometric sensors
A pump light source provides pump light to an optical fiber arranged to guide the pump light to a first optical isolation device. Light output by the first optical isolation device is input to a...
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6327076 |
Optical amplifier equipment for WDM optical communication
To provide an optical amplifier which optically amplifies inputted WDM light and outputs the amplified signal light, and a control circuit of an optical branching unit and an optical output level...
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6327075 |
Optical gain equalization unit, optical gain equalization method, and optical fiber transmission line
The present invention relates to a gain equalization unit installed on an optical fiber transmission line with a plurality of lines. The gain equalization unit has gain equalizers and loss...
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6323993 |
Method of optical signal transmission with reduced degradation by non-linear effects
In an optical communication system, the signal power level injected into each of one or more optical fiber spans is reduced so as to suppress undesired non-linear effects. This reduction in...
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6320693 |
Thermal tuning of optical amplifiers and use of same in wavelength division multiplexed systems
Techniques for controlling the shape of the gain spectrum of an optical amplifier (13) based on the temperature and level of inversion of the amplifier's amplifying medium (20) are provided. An...
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6317256 |
Method of gain and noise figure equalization for simultaneous optical splitter/amplifier
A method (100) and process (120) for extending the optical bandwidth of an optical signal splitter/amplifier (160) that includes optical amplifier material and an multi-mode interference splitter....
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6317254 |
Parallel optical fiber amplifier with high power conversion
A parallel optical fiber amplifier having a configuration in which a C-band silica-based erbium-doped fiber amplifier (EDFA) stage and an L-band EDFA stage are coupled together in parallel in such...
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6313941 |
Optical component, optical amplifier and method of controlling optical amplifier characteristic
An optical amplifier that can easily cope with alteration of characteristics and whereby a prescribed characteristic can be obtained in a stable fashion. In an optical amplifier, a plurality of...
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6313940 |
System based control of optical amplifier transmission functions
Each of a series of optical amplifiers is arranged such that, in response to detecting particular stimuli occurring at an input or receipt of an adjustment start message from an upstream amplifier,...
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6310720 |
Polarization insensitive semiconductor optical amplifier
An optical amplifier module that is insensitive to polarization comprises a first fiber, a second fiber, a semiconductor optical amplifier (SOA), and a polarization dependent loss (PDL) unit. The...
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6310716 |
Amplifier system with a discrete Raman fiber amplifier module
An amplifier system includes: (i) a distributed Raman fiber amplifier adapted to amplify C and L-band signals and; (ii) a discrete Raman fiber amplifier module that includes a C-band...
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6307984 |
Optical fiber communication system using optical phase conjugation as well as apparatus applicable to the system and method of producing the same
An optical fiber communication system according to the present invention has, for example, first and second phase conjugators. The first phase conjugator converts a signal beam from a first optical...
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6307668 |
Ultra-wide bandwidth fiber based optical amplifier
An ultra-wide bandwidth optical amplifier for the 1.5 μm optical band divides the 1520 nm-1610 nm bandwidth into three narrow bandwidths, i.e. C1 (1520 nm-1541 nm), C2 (1541 nm-1565 nm) and L...
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6307667 |
Gain-clamped erbium-doped fiber amplifier with pulsed compensating laser signal
A gain-clamped, optical amplifier includes a rare-earth doped fiber and a source of pump energy coupled to the rare-earth doped fiber. The doped fiber serves as a gain medium that is optically...
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6304369 |
Method and apparatus for eliminating noise in analog fiber links
An optical transmission system that includes an optical amplifier coupled to the input of an optical modulator having at least two complementary output ports for providing complementary modulated...
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6297903 |
Multiple stage optical fiber amplifier and signal generator
An optical amplifier makes use of a co-propagating fiber amplifier stage and a counter propagating fiber amplifier stage. One of the stages is preferably a low noise stage, while the other is a...
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6297902 |
Light amplification medium control method, light amplification apparatus and system using the same
In a light amplification apparatus in which a part of a light output from a light amplification medium is transmitted through a branching means to a light detection means so that light power of the...
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6292291 |
Optical fiber amplifier having constant output power for each channel and amplifying method thereof
An optical fiber amplifier having constant output power for each channel including a first measuring unit for dividing an input light signal into a first light signal and a second light signal,...
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6292290 |
Methods and apparatus for adjusting power in an optical signal, for providing a seamless optical ring and for providing a bidirectional equalized amplifier
A method and apparatus for adjusting power in an optical signal are disclosed and a bidirectional equalized amplifier for providing bidirectional equalization, employing the apparatus and method is...
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6292289 |
Method, device, and system for transmitting a supervisory optical signal
The present invention relates to a method for transmitting a supervisory optical signal. A first optical amplifier for a first band (e.g., a conventional band: C band) determining a noise...
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6282017 |
Optical communication system and optical amplifier
An optical communication system having a transmitting station for outputting WDM(wavelength-division multiplexing) signal light, an optical fiber transmission line, a receiving station, and an...
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6275329 |
Method and apparatus for amplification of an optical signal
A method and apparatus for amplifying an optical signal in an optical network is provided. In an embodiment of the present invention, an optical amplifying module is disclosed for use in an optical...
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