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| Number | Title | Issue Date |
| 8164826 | Multi-stage optical amplifier and method of controlling the same The present invention provides a multi-stage optical amplifier including a high SN ratio and a method of controlling the same. A multi-stage optical amplifier is configured such that the gain of an amplifying unit in a first stage is greater than that of an amplifyi... | 04/24/2012 |
| 8077383 | Optical amplifier An optical amplifier including: a first amplifying unit amplifying an input light by utilizing a first excitation light and thereby outputting a first amplified light; a second amplifying unit amplifying the first amplified light by utilizing a second excitation lig... | 12/13/2011 |
| 8045260 | Optimized signal control in frequency-doubled laser sources The present disclosure relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present disclosure, a method of operating a laser projection system is provided. According to the method, the laser projection system is... | 10/25/2011 |
| 7924499 | Gain and signal level adjustments of cascaded optical amplifiers An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplif... | 04/12/2011 |
| 7843630 | Cascaded optical amplifier and control method thereof A cascaded optical amplifier including a first optical amplifier and a second optical amplifier in cascaded arrangement is provided. Each of the first optical amplifier and the second optical amplifier has a respective input for receiving an optical signal, an outpu... | 11/30/2010 |
| 7692851 | Article comprising a series expandable erbium-doped fiber amplifier (SE-EDFA) A method for increasing the number of channels amplified by an optical amplifier arrangement is provided. The optical amplifier arrangement includes at least one optical amplifier stage amplifying a first number of channels at a given average gain level. The method ... | 04/06/2010 |
| 7643206 | Optical amplifier An optical amplifier of the present invention comprises: first and second optical amplifying sections connected in series to each other between an input port and an output port; a first variable optical attenuator arranged on a former stage of the first optical ampl... | 01/05/2010 |
| 7548368 | Raman amplifier, optical repeater, and raman amplification method A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval bet... | 06/16/2009 |
| 7535630 | Broadband hybrid two-stage optical amplifier An optical amplifier is disclosed having a relatively high gain and low noise figure across the broadband wavelength range. In an exemplary embodiment, the optical amplifier comprises an optical fiber including a core doped with a fluorescent material, the optical a... | 05/19/2009 |
| 7474459 | 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 second light amplifying optical fiber amplifying a first light output from... | 01/06/2009 |
| 7440168 | Managing gain tilt in an optically amplified transmission system An optical transmission system may include a combination of higher gain repeaters and lower gain repeaters, arranged to manage gain tilt. The higher gain repeaters and lower gain repeaters may be arranged to allow net gain to vary (e.g., above and below zero) within... | 10/21/2008 |
| 7440171 | Staged amplifier for lower noise figure and higher saturation power An optical amplifier utilizes two or more doped fiber segments or portions to achieve a lower noise figure and a higher saturation power than would be possible using any one of the doped fiber segments. Each doped fiber portion may be considered to be a doped fiber ... | 10/21/2008 |
| 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 efficiency. The optical fiber amplifier includes a rare earth doped fiber. P... | 06/24/2008 |
| 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 signal having a plurality of optical wavelengths and the like according t... | 06/24/2008 |
| 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 first measuring device for measuring a property of an input signal of... | 06/03/2008 |
| 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 through a feedback loop while amplifying a received optical signal; a fix... | 04/29/2008 |
| 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 Raman amplifier having a gain wavelength characteristic with a plurality... | 04/08/2008 |
| 7349636 | Optical phase and intensity modulation with improved transmitters An apparatus for transmitting at least a digital optical signal with a simultaneous modulation of the amplitude and the phase, the said encoded optical signal having improved spectral efficiency and performances, and being generated by transmitters with simplified s... | 03/25/2008 |
| 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 the optical amplifiers are operated to provide net losses or net gain... | 03/04/2008 |
| 7330302 | Optical transmission system This invention provides an optical transmission system which allows to perform high-quality transmission of each of a plurality of signal channels multiplexed. In the optical transmission system, signal light in which a plurality of signal channels with an optical f... | 02/12/2008 |
| 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 segment one or more wavelengths is dropped so as to exploit a gain versu... | 01/29/2008 |
| 7317857 | Optical fiber for delivering optical energy to or from a work object An optical fiber can include a glass core that is multimode at a selected wavelength and that comprises an index of refraction and a diameter Dcore, a glass cladding disposed about said glass core, said glass cladding comprising an outer diameter Dcl... | 01/08/2008 |
| 7280759 | Optical transmission system, optical multiplexer, and optical demultiplexer An optical transmission system capable of transmitting with high quality all the component signals of a signal lightwave having a broad total wavelength band and particularly suitable for the CWDM optical transmission, and an optical multiplexer and an optical demul... | 10/09/2007 |
| 7274871 | Optical transmission system with raman amplifiers comprising a supervisory system An optical transmission system having a supervisory system of devices disposed along an optical link. Counter-propagating Raman amplifiers are disposed along the optical link. Low-frequency supervisory signals are superimposed on the optical signals traveling on the... | 09/25/2007 |
| 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 input end, an amount of fluctuation in a current pumping light power... | 08/28/2007 |
| 7254326 | Optical transmission system with raman amplifiers comprising a supervisory system An optical transmission system having a supervisory system of devices disposed along an optical link. Co-propagating Raman amplifiers are disposed along the optical link. Low frequency supervisory signals are superimposed on the optical signals traveling on the opti... | 08/07/2007 |
| 7236504 | Stretched-pulse Raman fiber lasers and methods of operating the same A method of operating a stretched-pulse Raman fiber laser includes producing laser radiation gain in a laser cavity using predominantly Raman amplification. Such a stretched-pulse Raman fiber laser has a laser cavity that includes a Negative Group Velocity Dispersio... | 06/26/2007 |
| 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 unit to emit excitation power needed to get the same amplifying opera... | 06/26/2007 |
| 7224517 | 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 second light amplifying optical fiber amplifying a first light output from... | 05/29/2007 |
| 7224514 | Using gain tilt for local compensation of unwanted power gradients A compensator for optical transmission systems exploits gain tilt inherent in optical amplifiers. The amount of SRS induced spectral power gradient is determined, and the amplifier gain is changed to cause a compensating gain gradient in the optical amplifier to com... | 05/29/2007 |
| 7224518 | Fiber-optic amplification of light pulses A device for amplifying light pulses has an optical stretcher, in which the light pulses of a pulsed laser light source are temporally stretched, and an optically pumped amplifier fiber, in which the light pulses are amplified and, at the same time, temporally compr... | 05/29/2007 |
| 7215463 | Optical transmission systems including optical amplifiers and methods of use therein Optical transmission systems of the present invention include a plurality of optical amplifiers configured to provide optical amplification of one or more information carrying optical signal wavelengths. At least two of the optical amplifier are operated to provide ... | 05/08/2007 |
| 7212335 | Apparatus and method for amplification medium performance simulation, and optical amplifier An amplification medium simulation apparatus comprises a basic data retaining unit 21, an input signal beam information retaining unit 22, and a simulation executing unit 31 approximating and calculating an output signal beam power at each signa... | 05/01/2007 |
| 7202997 | Optical amplifier and optical amplifier control method An optical amplifier includes first and second optical amplifier units, a variable optical attenuator optically coupled between the first and second optical amplifier units, a first control unit to control gains of the first and second optical amplifier units based ... | 04/10/2007 |
| 7199921 | Two stage optical amplifier The invention describes a system of two-stage optical amplifiers adapted for inserting OADM in the mid-stage, and an integrated assembly designed for implementing the amplifiers in a way suitable for forming bi-directional configurations useful in optical networks. ... | 04/03/2007 |
| 7199920 | Two stage optical amplifier The invention describes a two-stage optical amplifier adapted for inserting OADM in the mid-stage, and an integrated assembly designed for implementing the amplifier in a way suitable for forming unidirectional and bi-directional configurations useful in optical net... | 04/03/2007 |
| 7200339 | Method and apparatus for laser line-width compensation Laser line-width compensation is performed by detecting noise in an optical signal output by a laser of an optical communications system and controlling a complex modulator to cancel the detected noise. Line-width compensation can be performed for both amplitude and... | 04/03/2007 |
| 7196840 | Amplitude balancing for multilevel signal transmission Arrangements are provided for an amplitude balanced optical amplifier. A combination of an optical preamplifier and a gain/loss variation modification device (VMD) is employed. The gain/loss VMD compensates the gain variation across different wavelength channels int... | 03/27/2007 |
| 7190510 | Metro wavelength division multiplexing network A metro wavelength division multiplexing network is disclosed and includes a plurality of optical repeaters connected to each other through an optical fiber link, wherein each of the optical repeaters includes a Raman gain medium for Raman-amplifying inputted optica... | 03/13/2007 |
| 7177541 | OSNR monitoring method and apparatus for the optical networks It is disclosed that a method and apparatus that automatically monitors each channel's optical signal-to-noise ration (OSNR) using optical filter and polarization extinction method in wavelength division multiplexing (WDM) scheme-based optical transmission systems. ... | 02/13/2007 |
