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| Number | Title | Issue Date |
| 8064130 | Optical amplifier It is an object of the present invention to provide an optical amplifier using optical amplification mediums each doped with a rare earth element for increasing amplification efficiency of signal light in S-band and the like. To this end, the optical amplifier is co... | 11/22/2011 |
| 8045259 | Active optical fibers with wavelength-selective filtering mechanism, method of production and their use The invention relates to optical fibers for use in optical amplification of light, such as in optical fiber amplifiers and lasers and for use in delivery of high power light, in particular to a scheme for reducing amplified spontaneous emission at undesired waveleng... | 10/25/2011 |
| 8004753 | Optical amplifier, fiber laser, and method of eliminating reflected light A MO-PA type optical amplifier is provided which includes an oscillator and an amplifier including a fiber for optical amplification, including: a reflected-light wavelength conversion fiber which is provided on an optical path between the oscillator and the amplifi... | 08/23/2011 |
| 7916385 | Apparatus and methods for optical communication An optical circuit is disclosed, which may include a semiconductor optical amplifier (SOA); an optical filter operable to filter light emerging from the SOA; and a PIN for converting the light output from the optical filter into an electrical signal, wherein the gai... | 03/29/2011 |
| 7864410 | Optical active device having optical amplifying sections cascaded on a path for propagating input light with a predetermined wavelength The present invention relates to an optically active device comprising a plurality of stages of optical amplifying sections cascaded on an input light propagation path, and a structure for effectively preventing an upstream pumping light source from being destroyed ... | 01/04/2011 |
| 7843629 | Periodically filtered broadband light source Embodiments of a periodically filtered broadband light source are described. The periodically filtered broadband light source includes a periodic spectral filter coupled to an optical gain element to generate a light and to filter the light into a plurality of indiv... | 11/30/2010 |
| 7570420 | Systems and methods for transmitting quantum and classical signals over an optical network Systems and methods for transmitting quantum and classical signals over an optical network are disclosed, wherein the quantum signal wavelength either falls within the classical signal wavelength band, or is very close to one of the classical signal wavelengths. The... | 08/04/2009 |
| 7525725 | Optical amplification module, optical amplifier, optical communication system, and white light source The present invention relates to an optical amplifier and the like having a flatter gain spectrum in the wavelength band of 1490 nm to 1520 nm than before. The optical amplifier according to the present invention comprises an Er-doped optical waveguide and a Tm-dope... | 04/28/2009 |
| 7511881 | Amplified spontaneous emission reflector-based gain-clamped fiber amplifier Provided is an all-optical gain-clamped fiber amplifier, comprising transmission and isolation means for periodically transmitting an optical signal or reflecting amplified spontaneous emission (ASE) back to a gain medium. The transmission and isolation means can be... | 03/31/2009 |
| 7508577 | Method and system for suppressing ASE noise A bandstop filter method and system for suppressing ASE noise is disclosed. In one embodiment of the bandstop filter system, there is provided a first switch, having an input port for receiving an optical signal, and two output ports; a bandstop filter coupled to a ... | 03/24/2009 |
| 7440170 | Method and apparatus for monitoring optical signal-to-noise ratio Optical signal-to-noise ratio (OSNR) monitoring methods and apparatus are described. A tunable optical filter filters an optical channel containing an optical signal and noise. The total signal and noise power at the output of the filter is measured as the transmitt... | 10/21/2008 |
| 7421168 | Integrated optical channelizer A signal channelizer (10) includes an input waveguide (14) carrying an inputted signal (20) having a plurality of wavelengths. The input waveguide (14) has an input port (22) for receiving the inputted signal (20). A plurali... | 09/02/2008 |
| 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 |
| 7354772 | Tag free bio sensing micro strip A system and method for determining information about an assay. In one embodiment the method includes positioning a filter assembly, having an assay disposed on its surface, relative to a light source such that light from the light source is incident on the filter a... | 04/08/2008 |
| 7345811 | Multimode fiber optic amplifier and method of amplifying optical signals A multimode fiber receiver includes a multimode collimator, a multimode fiber optic amplifier and a detector. The collimator receives incoming signals and provides the signals to the amplifier. The amplifier includes plural amplification stages, a limiter, a tunable... | 03/18/2008 |
| 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 |
| 7295780 | Apparatus for detecting peaks of wavelength-division-multiplexed light, and apparatus for controlling said light Disclosed is an apparatus for controlling wavelength-division-multiplexed light wherein overall power of wavelength-division-multiplexed light is rendered constant through control for uniformalizing the level of only one wave of maximum power, and wherein the levels... | 11/13/2007 |
| 7262904 | Tunable optical add/drop device Improved designs of optical devices for processing optical signals with one or more specified wavelengths are disclosed. According to embodiment, a filter mirror assembly appears an “L” shape and provides a filtering function as well as a reflecting function. Th... | 08/28/2007 |
| 7253944 | Multi-stage raman amplifier A Raman amplifier having at least a first and a second optical Raman-active fiber disposed in series with each other is disclosed. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active ... | 08/07/2007 |
| 7236700 | Scalable and exchangeable erbium doped fiber amplifier for DWDM Erbium doped fiber amplifiers for dense wavelength division multiplexed (DWDM) metro area optical networks may be configured as either high gain amplifiers or power amplifiers. The erbium doped fiber type, length, and pump power level are selected so that the shape ... | 06/26/2007 |
| 7233721 | Low loss spectrally periodic all-fiber filters The present invention provides a method and resulting device for producing a low-loss spectrally periodic all fiber filter by providing a multi-mode fiber capable of propagating an LP01 mode and an LP02 mode at wavelengths of interest and providing a single-mode fib... | 06/19/2007 |
| 7233724 | Long period bragg grating optical signal attenuation An apparatus in one example comprises one or more light sources, one or more long period Bragg gratings that are optically coupled with the one or more light sources, and one or more amplification fibers that are optically coupled with the one or more long period Br... | 06/19/2007 |
| 7224516 | Multimode fiber optic amplifier and method of amplifying optical signals A multimode fiber receiver includes a multimode collimator, a multimode fiber optic amplifier and a detector. The collimator receives incoming signals and provides the signals to the amplifier. The amplifier includes plural amplification stages, a limiter, a tunable... | 05/29/2007 |
| 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 |
| 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 |
| 7197245 | System and method for managing system margin An optical communication system is operable to communicate a plurality of wavelength signals at a bit rate of at least 9.5 gigabits per second over a multiple span communication link spanning at least 400 kilometers without optical regenerators. The plurality of wav... | 03/27/2007 |
| 7142782 | Noise light elimination method, noise light elimination apparatus and optical transmission system, using stimulated brillouin scattering The invention is aimed at providing a simple noise light elimination technique capable of eliminating noise light components contained in a signal light, together with wavelength components same as for the signal wavelength, with the condition of the light remaining... | 11/28/2006 |
| 7106501 | Fiber amplifier with suppression of amplified spontaneous emission A fiber amplifier module for amplifying a signal pulse includes an optically pumped double-pass fiber amplifier in which a fiber Bragg grating reflects an amplified pulse in between the first and second amplification passes, and transmits most forward-propagating am... | 09/12/2006 |
| 7079313 | Optical amplifying apparatus which routes pumping light to a raman amplification medium and a rare-earth-doped optical amplification medium An optical amplifying apparatus has a plurality of pumping sources generating pumping light beams at different wavelengths, a Raman amplification medium receiving the pumping light beams from the pumping sources to amplify a main signal light beam by using stimulate... | 07/18/2006 |
| 7072100 | Optical amplifier and gain tilt compensation method The optical amplifier realizes EDFA amplification of optical signals in new bands (the S+- and S-bands), at wavelengths of 1450 to 1530 nm. The amplifier uses multiple erbium-doped fibers to amplify optical signals at wavelengths of 1450 to 1530 nm. Each ... | 07/04/2006 |
| 7064890 | Optical amplifier and optical communication system including the same The present invention relates to an optical amplifier (TDFA) or the like comprising a structure for constantly keeping the power of outputted signal light and gain flatness even when the power or number of channels of input signal light fluctuates. In this op... | 06/20/2006 |
| 6999683 | Optical fiber transmission system with noise loaded idler channels A wavelength division multiplex optical system includes a WDM combiner to provide a source signal, at least one transmitter coupled to an input of the WDM combiner, a broadband noise source, and a filter coupled between the broadband noise source and another input o... | 02/14/2006 |
| 6975454 | Variable polarization-dependent-loss source An optical device including a beam splitter, polarization controller, and beam combiner is described. In some embodiments, the beam splitter and beam combiner are provided in a single element. An incoming light beam is split into two beams with different polarizatio... | 12/13/2005 |
| 6954303 | Multi-stage optical amplifier and broadband communication system A multi-stage optical amplifier that has an optical fiber with a first length of amplifier fiber and a second length of amplifier fiber. The optical fiber is configured to be coupled to a signal source that produces at least a signal wavelength λs and a ... | 10/11/2005 |
| 6952529 | System and method for monitoring OSNR in an optical network An apparatus and method for measuring optical signal to noise ratio (OSNR) in a node of an optical data network is disclosed. A peak power level and an average power level are measured for an optical input to an optical detector. The OSNR is determined by selecting ... | 10/04/2005 |
| 6943938 | Tunable wavelength filter with invariant transmission and reflection beam angles Improved designs of optical devices for processing optical signals with own or more specified wavelengths are disclosed. According to embodiment, a filter mirror assembly appears an “L” shape and provides a filtering function as well as a reflecting function. Th... | 09/13/2005 |
| 6919986 | Nonlinear polarization amplifiers in nonzero dispersion shifted fiber A broadband fiber transmission system includes a transmission line with at least one zero dispersion wavelength λo and transmits an optical signal of λ. The transmission line includes a distributed Raman amplifier that amplifies the optical signal throu... | 07/19/2005 |
| 6894830 | Bi-directional optical-amplifier module Disclosed is a bi-directional optical-amplifier module including first through fourth optical amplifiers, a mid-stage device for performing a desired signal processing for an upward or downward optical signal passing therethrough, a first optical-signal-path-setting... | 05/17/2005 |
| 6829410 | Optical signal interleaving comb filter with reduced chromatic dispersion and applications therefor Optical signal interleaver/deinterleavers with reduced chromatic dispersion are described. In one embodiment, the interleaver/deinterleavers include two optical filters and an optical isolator coupled to receive the output of each of the optical filters. The optical... | 12/07/2004 |
| 6810214 | Method and system for reducing degradation of optical signal to noise ratio In one aspect of the invention, a system operable to reduce degradation of an optical signal to noise ratio where signals having multiple wavelengths are communicated over a common optical link includes an amplifier assembly operable to introduce to a lower communic... | 10/26/2004 |
