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6195200 High power multiwavelength light source  
In accordance with the invention, a multiwavelength light source comprises a length of optical waveguide amplifier, a multiwavelength reflector for reflecting a plurality of different spectrally...
6192179 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,...
6192058 Multiwavelength actively mode-locked external cavity semiconductor laser  
A multiwavelength mode-locked (MWML) angled-stripe SOA laser that emits multiple discrete groups of wavelengths simultaneously in a short time interval, where each group is located at a wavelength...
6188508 Control signal superimposer  
A control signal superimposer for superimposing a control signal on a signal light, comprising a pumping light source for generating a pumping light with intensity fluctuation in accordance with...
6181465 Optical fiber gain medium with wavelength selective core filter  
An optical fiber used as the active amplifying medium in a fiber laser is arranged to have a high insertion loss at an undesired frequency, while retaining a low insertion loss at a desired lasing...
6178038 Optical amplifier having an improved noise figure  
A dispersion compensating element, such as a dispersion compensating fiber, is provided between two erbium doped fiber segments of a two stage amplifier, and is pumped with light of a sufficient...
6175671 Photonic crystal waveguide arrays  
A waveguide device for optical signals in an optical communication system relies upon photonic bandgap material to guide the optical signal via a plurality of pathways. A two-dimensional photonic...
6175445 Optical fiber for a flat-gain optical amplifier  
The invention relates to an optical fiber having a core based on silica with at least one fluorescent dopant distributed over the entire section of the core, a central zone co-doped with a...
6175436 Automatic feedback gain control for multiple channels in a doped optical fiber amplifier  
An apparatus and method for controlling the gain in an erbium-doped fiber amplifier (EDFA) incorporated into a multi-wavelength communication system so as to amplify each of the wavelength signals....
6172803 Optical amplifier and transmission system using the same  
An optical amplifier having a two-stage construction using an erbium doped fiber (EDF) as a gain medium. The erbium dopant concentration is 1000 ppm, and the unsaturated absorption coefficient of...
6172801 Optical amplifier, optical amplifying apparatus, optical transmitter for use in optical communications system, and optical surge suppression method for the optical amplifier  
There is disclosed a technique regarding an optical amplifier in an optical communications system. In order to effectively suppress optical surges during amplification of signal light, through a...
6169615 Wavelength division multiplex optical transmission apparatus  
The present invention relates to a wavelength division multiplex optical transmission apparatus including an optical sending system having at least a plurality of optical sending sections to...
6166851 Optical amplifier manufacture  
A construction of gain tilt exhibiting optical amplifier that incorporates a gain flattening filter also includes a neutral density filter the value of whose attenuation is adjustable after...
6163399 Method and apparatus for suppressing transients in optical amplifiers  
The invention is a transient suppression system for use with an optical amplifier having a specifiable total output optical power. The system measures the power in a filtered electronic version of...
6163398 Dispersion compensating fiber and optical amplifier using same  
With a dispersion compensating fiber 1, a dispersion compensating fiber material having a dispersion characteristic which is opposite to a dispersion characteristic of an optical transmission path,...
6160659 Method and apparatus for monitoring the momental wavelength of light, and an optical amplifier and an optical communication system which incorporate the method and apparatus to adjust gain tilt  
An apparatus which receives an input light having a spectrum, and determines a momental wavelength of the spectrum. The apparatus includes a decoupling unit, a weighting unit and a computation...
6160658 Optical amplifier for wavelength multiplexing optical transmission  
An optical amplifier for wavelength multiplexing optical transmission has an optical amplifier for amplifying wavelength-multiplexed signal light in which signal lights having wavelengths different...
6160657 All optical gain-clamped amplifier and method thereof  
In an optical amplifier including an optical wavelength selective coupler for coupling an input optical signal by a wavelength selective coupling method, a gain medium for amplifying a signal from...
6157481 Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of the 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...
6154590 Wavelength-tunable devices and systems comprising flexed optical gratings  
In accordance with the invention, a tunable optical grating device comprises a grating, which is fixed at both ends to a support frame and is flexed so that a tensile strain induced in the grating...
6154588 Dispersion compensation apparatus  
Dispersion compensation having a flat loss characteristic is performed. Overall wavelength dependence is made flat by using a passive device, such as a fiber Bragg grating having a transmission...
6151160 Broadband Raman pre-amplifier for wavelength division multiplexed optical communication systems  
An optical WDM transmission system. The arrangement includes a splitter for dividing a multiplexed optical signal having a prescribed bandwidth into a plurality of distinct sub-bands. The plurality...
6151159 Optical amplifier for wavelength multiplex transmission  
An optical amplifier for wavelength multiplex transmission is capable of reducing the gain difference of each wavelength. A pumping light source generates pumping lights to excite an optical fiber...
6151158 Method and device for optical amplification and system having the device  
A device comprising an optical amplifier including an optical amplifying medium, and first and second optical filters operatively connected to the optical amplifier to suppress the wavelength...
6151157 Dynamic optical amplifier  
An optical amplifier for amplifying a plurality of signal components of a multi-wavelength optical beam passing through an optical fiber includes a portion of the optical fiber doped with a rare...
6151156 Optical fibre amplifier and transmission system with optical fibre-amplifier  
An optical fibre-amplifier and a transmission system with such a fibre-amplifier is proposed, in which the fibre-amplifier has an amplifying fibre-component with optical fibre-amplifier (2) and at...
6148128 Passively temperature-compensated wavelength-tunable device comprising flexed optical gratings and communication systems using such devices  
In accordance with the invention, a passively temperature-compensated tunable optical grating device comprises a grating, which is fixed at both ends to a support frame, and is mechanically or...
6147796 Method for determining transmission parameters for the data channels of a WDM optical communication system  
A method is provided for determining at least one optical transmission parameter for achieving a prescribed operating characteristic of an optical transmission system that includes at least one...
6147795 Retrofit heater for erbium fiber in an erbium-doped fiber amplifier (EDFA)  
A heater system for heating an erbium-doped fiber amplifier (EDFA) of a fiber optic communication system operable in an environment. The heater system includes a pump laser for providing optical...
6144788 High stability fiber light source  
A fiber light source having, for instance, a 980 nm pump laser for pumping an erbium-doped optical fiber via a 980/1550 nm WDM coupler. The pumped fiber emits 1550 nm light. A portion of the 1550...
6144706 Distortion compensation circuit  
To obtain a uniform improving effect of secondary distortion over a wide frequency band with a very simple configuration and less power consumption in the distortion compensation circuit, that...
6144488 Optically amplifying device with gain equalizing function  
An optically amplifying device with a gain equalizing function comprises: an optical fiber amplifier for receiving, as an input, a wavelength division multiplexed signal light beam which has been...
6144487 Optical amplifying apparatus capable of detecting at least one of optical individual signals  
In an optical amplifying for amplifying an input wavelength multiplexed signal into an amplified output wavelength multiplexed signal, each of the input wavelength multiplexed signal and the...
6144486 Pump wavelength tuning of optical amplifiers and use of same in wavelength division multiplexed systems  
The variables and parameters previously understood to affect the gain spectrum of an optical amplifier 13 were: (1) the wavelengths to be amplified; (2) the input power levels at those wavelengths;...
6144485 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...
6141142 Article comprising an L-Band optical fiber amplifier  
L-band EDFA (Er-doped fiber amplifier) characteristics are improved by provision of filter means in the C-band, the filter means having a figure of merit greater than 400dBnm. The filter means...
6141130 Spectral equalizer for multiplexed channels  
An optical element having a periodically varying spectral response is used to flatten the spectral amplitudes within each of a group of multiplexed channels having different predetermined central...
6140979 Scanned display with pinch, timing, and distortion correction  
A display apparatus includes an image source that scans about two axes. To offset motion about a first of the axes during sweeps about the second axis, the apparatus includes a structure to produce...
6134047 Optical amplifier designs for multichannel fiber optic communication networks  
A multichannel fiber optic communication network incorporates multichannel fiber optical amplifiers having different functions but designed to use substantially identical gain flattening filters....
6134046 Optical amplifying fiber and forming method for fiber grating  
An optical amplifying fiber including a core doped with a rare earth element and having a first refractive index, a cladding surrounding the core and having a second refractive index smaller than...
6122421 Magnetostrictive wavelength-shifting devices and optical communication systems comprising same  
A programmable and latchable device for wavelength shifting and chromatic dispersion compensating is disclosed. An optical grating such as a Bragg grating, a nonchirped grating, or a linearly or...
6122096 Expandable wavelength-selective and loss-less optical add/drop system  
An expandable optical add/drop system according to the present invention includes an optical add/drop multiplexer with an integrated amplification and wavelength-selective fiber path and passive...
6122095 Wavelength-selective and loss-less optical add/drop multiplexer  
A loss-less, optical add/drop multiplexer according to the present invention includes a rare earth-doped fiber amplifier integrated with a wavelength-selective fiber path coupled between two...
6118575 Optical fiber gain medium with evanescent filtering  
An optical fiber used as the active amplifying medium in a fiber laser is arranged to have a high insertion loss at an undesired frequency, while retaining a low insertion loss at a desired lasing...
6115174 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...
6111688 Optical amplifier and system including the same  
Disclosed herein is an optical amplifier including an optical amplifying medium, a pumping source, an optical filter, and a control unit. Signal light is supplied to the optical amplifying medium....
6111687 Transmitting supervisory messages from a fiber amplifier  
The present invention is based on the idea that an optical band-pass filter (22) is employed in addition to its normal function for modulating a signal passing through the fiber amplifier on such a...
6111686 Optical fiber amplifier  
An optical fiber amplifier includes an input side wavelength combiner and an output side wavelength combiner arranged at an input side and an output side, respectively. An input optical signal is...
6108123 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...
6104848 WDM optical transmitter  
It is the object of the invention to provide a WDM optical transmitter, in which levels of optical signals transmitted therefrom is increased and equalized. Optical amplifiers, which are provided...
Matches 701 - 750 out of 1125 < 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 >