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6560381 |
Optical filter
Three Mach-Zehnder interferometers 141 to 143 are connected in a series between an optical input terminal and an optical output terminal in an optical filter. Each interferometer is composed of...
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6560010 |
Broadband gain-clamped semiconductor optical amplifier devices
A broadband semiconductor optical amplifier (SOA) device includes at least two gain-clamped SOAs having different spectral responses. The gain-clamped SOAs are coupled so that the broadband SOA...
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6560008 |
Controlling apparatus and controlling method for wavelength division multiplexing optical amplifier
The present invention aims at providing a controlling apparatus and a controlling method for a wavelength division multiplexing optical amplifier to reduce the controlling error due to the...
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6556345 |
Optical network equipment with control and data paths
Optical amplifiers and other optical network equipment are provided for use in fiber-optic communications networks. The equipment may include dynamic spectral filters and optical channel monitors....
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6556341 |
Optical transmission system having cascaded raman
An optical transmission system for wavelength-division multiplex signals, having cascaded Raman amplifiers, has a number of pump sources for each Raman amplifier, each having different pump...
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6552845 |
Optical gain equalizer and optical fiber transmission line
Disclosed is an optical gain equalizer for equalizing optical powers for a plurality of signal lights having wavelength different from one another. Disclosed are also an optical transmission line...
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6552844 |
Passively output flattened optical amplifier
An optical amplifier and communications system for amplifying an input signal and providing an output signal includes a nonlinear light absorber for passively controlling the level of the output...
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6549331 |
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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6545800 |
Depolarizers for optical channel monitors
Optical channel monitor depolarizers are provided. The depolarizers may be used to reduce the effects of polarization-dependent loss on optical channel power measurements made in optical amplifiers...
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6545799 |
Method and apparatus for optical system link control
A method for tuning and improving the performance of an optical communication system comprising al link that includes optical amplifiers and, optionally, active and/or passive optical components...
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6545798 |
Thermal ripple-compensating, gain-flattening filter for an optical amplifier
An optical device including an optical amplifier to amplify optical signals received through an optical input, and to supply the amplified optical signals from an optical output, and an optical...
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6542678 |
High-dispersion fibers for high-speed transmission
The specification describes an optical transmission system for high speed, high capacity digital pulse transmission, i.e. at least 10 Gb/s at a duty cycle of at least 10%, which uses transmission...
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6542291 |
Optical amplifier excitation light source control method for use in optical amplifier and optical amplifier control method
In an optical amplifier for use in, for example, a wavelength multiplexing optical communication system, in order to allow an excitation light source to be enlargeable or removable in accordance...
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6542290 |
Optical amplifier
A method of amplifying, transmitting and receiving a signal light. The method includes multiplexing the signal light and a pumping light from a pumping light source so as to output the signal light...
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6542289 |
Gain saturation tuning in optical amplifiers
A method for controlling the shape and magnitude of the L-band gain spectrum of an erbium doped optical amplifier, in one aspect, involves saturating the amplifier gain with a saturating signal in...
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6542288 |
Optical amplifier utilizing rare earth element-doped optical fibers for temperature compensation
In an optical amplifier using a rare earth element-doped optical fiber such as an erbium-doped optical fiber, a variation of amplification gain resulting from temperature change is suppressed and...
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6542287 |
Optical amplifier systems with transient control
Optical amplifier equipment is provided for wavelength-division-multiplexing optical communications links that support multiple channels operating at different wavelengths. The optical amplifier...
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6542233 |
Method and apparatus for the measurement of erbium optical amplifiers
An inexpensive broadband source such as an ASE source, used for erbium amplifier measurements, compares well with the use of a prior art ITU grid. Deltas are less than 0.4 and 0.3 dB for gain and...
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6539153 |
Light limiter
The object of the present invention is to provide a light limiter which can control the generation of an optical surge, comprises few components, and has high reliability; in order to achieve the...
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6538808 |
Semiconductor optical amplifier
Semiconductor optical amplifiers (SOAs) are cheaper to manufacture, control and test than other types of optical amplifier such as erbium doped fiber amplifiers (EDFAs). However, SOAs are...
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6538803 |
Optical amplifier and optical wavelength division multiplexing communication system
The present invention provides a wavelength division multiplex light communication system using an optical amplifier which can amplifying and translating a multiplex light signal obtained by...
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6535331 |
Wideband optical amplifier and wideband variable wavelength optical source
A wideband optical amplifier for amplifying an input optical signal of known wavelength in one of at least two bands of wavelength has a significantly small number of optical components and thus is...
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6535330 |
Dynamic controller for a multi-channel optical amplifier
A dynamic controller for a multi-channel EDFA-type optical amplifier is provided that is capable of providing a substantially tilt-free output over a range of selectable gain set points. The...
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6535329 |
Temperature tuning an optical amplifier
A method and system is disclosed of characterizing an optical amplifier for operation with a required tilt or curvature within predetermined limits. As the temperature of the erbium-doped optical...
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6532106 |
All-optical gain controlled bidirectional add/drop optical amplifier
A bidirectional add/drop optical amplifier used in wavelength division multiplexing (WDM) optical networks to suppress the power change resulting from the adding and dropping of optical signals...
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6532104 |
C-band and L-band optical amplifier for submarine transmission systems
The invention proposes an optical amplifier for the C and L bands having a first stage with an amplification fiber ( 8 ) common to the C and L bands, a second stage with a branch ( 14 ) for C-band...
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6532103 |
Optical fiber amplifier and optical transmission system using the same
A variable attenuator is inserted into an optical input part and a feedback control is performed so that an optical input to an amplifying optical fiber becomes constant. Further, a control for...
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6532101 |
System and method for wide band Raman amplification
A multi-stage Raman amplifier includes a first Raman amplifier stage having a first sloped gain profile operable to amplify a plurality of signal wavelengths, and a second Raman amplifier stage...
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6529319 |
Automatic gain-controlled optical fiber amplifier
The present invention is to provide an automatic gain-controlled optical fiber amplifier, comprising: a first optical branch for branching a portion of an optical signal inputted into the optical...
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6529316 |
Optical network equipment with optical channel monitor and dynamic spectral filter alarms
Optical amplifiers and other optical network equipment is provided for use in fiber-optic communications networks. The equipment may include dynamic spectral filters and optical channel monitors....
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6529315 |
Optical amplifier providing dispersion compensation
A dispersion-compensating fiber amplifier having a Raman pumped dispersion-compensating fiber and a distributed optical amplifier. The dispersion-compensating fiber is pumped such that the noise...
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6525873 |
Optical amplifiers with a simple gain/output control device
An optical fiber amplifier includes an optical system and an electronic controller. The optical system includes: an optical gain medium; at least one pump source coupled to the optical gain medium;...
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6525871 |
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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6525869 |
Raman amplifier
An optical amplifier has at least first stage in the form of a distributed Raman amplifier and a second stage in the form of a discrete Raman amplifier. The discrete amplifier has an output for...
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6522460 |
Optical fiber amplifier control
An optical fiber amplifier has a length of active optical fiber into which pump light from a pump laser is injected. The pump laser is locally controlled by a laser monitor diode, the pump laser...
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6522459 |
Temperature control and monitoring of optical detector components in an optical communication system
Optical detector components in a fiber-optic communication system are temperature stabilized. The optical detector components may be part of an optical amplifier, a receiver, or other optical...
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6519080 |
Optical amplifier and optical transmission system
An optical transmission system includes an optical transmitting unit ( 10 ) to transmit optical signals in a transmission wavelength band above 1570 nm; an optical receiving unit to receive the...
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6519079 |
Optical fiber amplifier with reduced noise and method of making the same
A method for amplifying optical signals and an optical fiber amplifier for accomplishing the same. An optical fiber is coupled to a source of pump light and a signal gain level is correlated to a...
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6519078 |
Raman amplifier
The object of this invention is to improve SNR in the Raman amplification. An optical fiber ( 10 ) consists of a dispersion shift fiber in which a zero dispersion wavelength is shifted to the 1.55...
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6515796 |
Saturated amplifier generating burst support signal
Circuitry and a concomitant methodology for generating a burst support signal to augment an input bursty optical signal in an optical channel. The burst support signal is produced whenever the...
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6515794 |
Techniques for making an insertion loss correction in an optical fiber amplifier
A method of providing a predetermined insertion loss in an optical fiber amplifier, includes the step of utilizing a predetermined, fixed, spectrally-flat loss compound (insertion loss pad, ILP) to...
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6515777 |
Ring gain control in WDM optical signal transmission system
A signal transmission system has a number of wave division multiplex optical carriers linking a number of switching units arranged in a closed ring network. The carriers are amplified to compensate...
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6509986 |
WDM ring transmission system having amplified dropped channels
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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6507420 |
Device and method for ascertaining noise power
The invention relates to a method and to an arrangement for estimating total noise power (k·Pλ) at a specified point in a WDM-system which includes a predetermined number of amplifiers ( 51 ),...
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6501870 |
System and method for reducing effects of optical impairments in optically amplified lightwave communication systems
The effects of optical impairments on optical signal transmission are substantially reduced in a lightwave transmission system by positioning optical amplifiers and network elements in respective...
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6498677 |
Optical amplifier systems with transient control
Optical amplifiers are provided for use in fiber-optic communications networks. Gain may be provided using one or more rare-earth-doped fiber coils such as erbium-doped fiber coils. The coils may...
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6498676 |
Optical filter for use or with an optical amplifier
This invention relates to invention relates to a method for filtering and a variable slope optical filter for in-line use with an optical amplifier signal. The filter has a wavelength response that...
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6496304 |
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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6496303 |
Ultra-broadband low-noise gain-flattened rare-earth-doped fibre amplifier
An optical amplifier waveguide provides variable amplification gain to a broad wavelength input signal. The degree of amplification is proportional to the length of the transmission of the input...
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6496302 |
Optical amplifier
A compensation scheme for an optical amplifier that reduces differences in gain observed at various wavelengths combines and controls characteristics of an automatic gain control circuit and...
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