| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | Optical fiber amplifier and optical transmission system using the same | JP16230097 | 1997-06-19 | JPH1117259A | 1999-01-22 | SAKANO SHINJI; YOKOTA ICHIRO; KOSAKA JUNYA; SUZUKI TAKAYUKI |
| PROBLEM TO BE SOLVED: To make the level of the optical input to an amplifying optical fiber const. to eliminate such breakdown factors as optical surge and reduce the cost and size by monitoring the level of the light just after the optical attenuation to make the feed back control of the level of the optical input to a variable light attenuator so as to make the monitor value always const. SOLUTION: A variable optical attenuator 10 adjusts the optical level of a signal light 1 incident on a input end optical connector so that the monitored optical level just after the attenuator 10 may be const. For example, in the case of C, B with a span loss lower 10 dB or 20 dB the loss of the optical attenuator on the input side is adjusted so as to provide an optical input with a loss equal to that in case A with the max span loss of 22 dB according to the transmission path design. This adjusting is automated by a feed back control from an optical monitor just after the attenuator 10, thereby adjusting the attenuator 10 for attenuations of 13 dB, 3 dB in the case of, e.g. C, B span losses. | ||||||
| 142 | Light amplifying device | JP17545391 | 1991-07-16 | JP2693662B2 | 1997-12-24 | 幸勇 知念 |
| 143 | Optical signal switching device and optical transmission system | JP6072896 | 1996-03-18 | JPH09252281A | 1997-09-22 | SAKAMOTO HIROSHI |
| PROBLEM TO BE SOLVED: To eliminate the optical power loss and also to reduce the scales of the device and system by driving a 1st or 2nd pumping laser beam source. SOLUTION: The 1st and 2nd rare earth dope optical fibers 5 and 6 are connected to an optical fiber 1 of the input side. When the pumping light is inputted to the fiber 5 from a 1st pumping laser beam source 7, the optical signal received from the fiber 1 is amplified and outputted. Then this optical signal is damped by the fiber 6. When the pumping light is inputted to the fiber 6 from a 2nd pumping laser beam source 8, the optical signal received from the fiber 1 is amplified and outputted. Then this optical signal is damped by the fiber 5. Both beam sources 7 and 8 are selectively driven, so that the transmission lines of optical signals are switched. In such a constitution, the optical signal loss can be eliminated and the scales of these device and system can be reduced. Then the device and system can be easily applied also to a submarine cable. COPYRIGHT: (C)1997,JPO | ||||||
| 144 | Optical fiber amplifiers and optical communication system | JP29344093 | 1993-11-24 | JP2636152B2 | 1997-07-30 | SHIGEMATSU MASAYUKI; NAKAZATO KOJI; KASHIWADA TOMONORI; NISHIMURA MASAYUKI |
| 145 | Optical fiber amplifier and an optical relay amplifier | JP29344093 | 1993-11-24 | JPH07147445A | 1995-06-06 | SHIGEMATSU MASAYUKI; NAKAZATO KOJI; KASHIWADA TOMONORI; NISHIMURA MASAYUKI |
| PURPOSE:To reduce wavelength dependency of amplification gain in various wavelength ranges and to maintain use efficiency of amplification energy by using a composite optical fiber wherein amplification optical fibers of different compositions are connected in series for amplification. CONSTITUTION:A composite optical fiber 110 inputs signal light and pumping light and outputs signal light after amplification. A plurality of optical fibers 111, 112 of different compositions whereto Er is added are connected in series, and an excitation device 210 generates pumping light and supplies it to the composite optical fiber 110. In the excitation device 210, any excitation method of forward excitation, backward excitation and bidirectional excitation can be adopted. Difference of compositions of the optical fibers 111, 112 is difference of each concentration of Al2O3, P2O5, and added Er contained in each of the optical fibers 111, 112 or difference of combination thereof. Thereby, it is possible to reduce the wavelength dependence of amplification gain in various wavelength ranges and to maintain use efficiency of amplification energy. | ||||||
| 146 | JPS5037303A - | JP6801974 | 1974-06-14 | JPS5037303A | 1975-04-08 | |
| 147 | REDUCTION OF SECOND-ORDER NON-LINEAR DISTORTION IN A WIDEBAND COMMUNICATION SYSTEM | US15597937 | 2017-05-17 | US20180337641A1 | 2018-11-22 | John Prentice; Alessandro Bertoneri; Chris Potter |
| A system has a plurality of non-linear circuit stages and an intervening linear circuit stage. An input signal is provided to a first non-linear circuit stage, and from the first non-linear circuit stage, to the linear circuit stage. The first non-linear circuit stage applies a second-order distortion to the input signal and provides the resulting signal to the linear circuit stage. The resulting signal that is output from the linear circuit stage is inverted with respect to the input signal and suitably linearly processed (attenuated or amplified). This signal is then provided to a second non-linear circuit that applies a second-order distortion and outputs a signal that has an overall reduction in second-order distortion. | ||||||
| 148 | OPTICAL AMPLIFIER | US14631165 | 2015-02-25 | US20150280391A1 | 2015-10-01 | Yoshito KACHITA; Tomoaki TAKEYAMA; Norifumi SHUKUNAMI |
| An optical amplifier includes an optical amplifying unit, a splitting unit, and a loss adjusting unit. The optical amplifying unit provides gain to wavelength multiplexed light received from a transmission line, to amplify light intensity. The splitting unit splits the amplified wavelength multiplexed light. The loss adjusting unit adjusts loss provided to each wavelength of a first portion or the split wavelength multiplexed light based on the gain. | ||||||
| 149 | Optical module used in optical communication systems, method of updating firmware of optical module used in optical communication systems, and trouble tracing system | US14052436 | 2013-10-11 | US09078054B2 | 2015-07-07 | Kazuyoshi Ooki |
| An optical module includes: an optical device driven by a driving voltage; an arithmetic processing chip including an arithmetic processing circuit that operates according to predetermined firmware and generates an electrical control signal indicating a magnitude of the driving voltage; a voltage generating unit provided outside the arithmetic processing chip, and including an input terminal that receives the control signal from the arithmetic processing chip and an output terminal that provides the driving voltage of a magnitude corresponding to the control signal to the optical device; and a voltage holding unit that holds an output voltage from the output terminal of the voltage generating unit at a constant voltage regardless of an operation state of the arithmetic processing circuit, when the firmware is updated. | ||||||
| 150 | Cascaded optical parametric amplifier with polarization exchange for noise reduction | US13898463 | 2013-05-20 | US08922874B2 | 2014-12-30 | Kouji Inafune; Hitoshi Murai; Tadashi Kishimoto |
| An optical amplification device includes a first optical amplification portion, an intermediate portion and a second optical amplification portion. The first optical amplification portion receives input light including signal light and pump light, generates idler light as wavelength converted light based on wavelengths of the signal light and the pump light, and outputs first output light including signal light, pump light and idler light. The intermediate portion outputs second output light, and includes a demultiplexing portion that demultiplexes the first output light into signal light, pump light and idler light, a multiplexing portion that generates the second output light by multiplexing signal light, pump light and idler light, and a polarization plane adjustment portion that exchanges mutually orthogonal polarization components of idler light. The second optical amplification portion amplifies an intensity of signal light included in the second output light. | ||||||
| 151 | Optical amplifier and an optical amplification method | US10686514 | 2003-10-16 | USRE44881E1 | 2014-05-06 | Hideaki Sugiya; Yoshihito Onoda |
| Two rare earth-doped optical fibers are connected in series and used to amplify input light. A splitter is installed between these two rare earth-doped optical fibers. The input light is monitored by having the portion of the input light that is branched off, by the splitter received by a photodiode. Excitation light output from a laser light source is guided by optical couplers and supplied to the above rare earth-doped optical fibers. A control circuit controls the output light level and, at the same time, stops the output from the laser light source when the input light level drops below a specified threshold value. The gain of the first stage rare earth-doped optical fiber while excitation light is being supplied is larger than the loss that occurs due to branching of the input light by the splitter. | ||||||
| 152 | Waveform shaping apparatus, optical transmission system, and waveform shaping method | US12073035 | 2008-02-28 | US08428470B2 | 2013-04-23 | Fumio Futami; Shigeki Watanabe |
| A waveform shaping apparatus includes a quantum dot optical amplifier in which an amplification factor of input signal beams saturates if the optical power of the signal beams is equal to or greater than a predetermined value; and a quantum dot saturable absorber in which an absorption factor of the input signal beams saturates if the optical power of the signal beams is under a predetermined value. The quantum dot optical amplifier and the quantum dot saturable absorber are connected in series with a transmission path of the signal beams, and shape the waveform of the signal beams. Voltages applied to the quantum dot optical amplifier and the quantum dot saturable absorber, respectively, are adjusted based on the optical power of the signal beams. | ||||||
| 153 | Optical transmission apparatus and optical signal level checking method | US12815722 | 2010-06-15 | US08422121B2 | 2013-04-16 | Hiroyuki Itoh; Takuji Maeda |
| An optical transmission node including an optical preamplifier to amplify input light and an optical postamplifier to amplify light output from the optical preamplifier, includes the optical postamplifier configured to generate amplified spontaneous emission light without signals input, the optical preamplifier configured to amplify the amplified spontaneous emission light from the optical postamplifier, a loopback switch configured to discouple a path of the light output from the optical preamplifier to the optical postamplifier, and couple a path of the light output from the optical postamplifier to the optical preamplifier. | ||||||
| 154 | Article comprising a multichannel optical amplified transmission system with functional upgrade capabilities and universal modules | US11666826 | 2005-10-29 | US07999999B2 | 2011-08-16 | Paul Francis Wysocki; Mitchell Steven Wlodawski |
| A universal inline functional module for operation with nonzero average gain G≠0dB over a bandwidth is provided. The module includes at least one optical functional element producing loss over the bandwidth and at least one rare-earth doped fiber segment. The module produces a flat gain spectrum to within a specified tolerance when made to operate at an average gain of 0 dB over the bandwidth. | ||||||
| 155 | GAIN AND SIGNAL LEVEL ADJUSTMENTS OF CASCADED OPTICAL AMPLIFIERS | US13042737 | 2011-03-08 | US20110164309A1 | 2011-07-07 | Shinya Inagaki; Norifumi Shukunami; Susumu Kinoshita; Hiroyuki Itou; Taiki Kobayashi |
| 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 amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation. | ||||||
| 156 | Gain and signal level adjustments of cascaded optical amplifiers | US11406281 | 2006-04-19 | US07969648B2 | 2011-06-28 | Shinya Inagaki; Norifumi Shukunami; Susumu Kinoshita; Hiroyuki Itou; Taiki Kobayashi |
| 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 amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation. | ||||||
| 157 | Gain and signal level adjustments of cascaded optical amplifiers | US12822797 | 2010-06-24 | US07924499B2 | 2011-04-12 | Shinya Inagaki; Norifumi Shukunami; Susumu Kinoshita; Hiroyuki Itou; Taiki Kobayashi |
| 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 amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation. | ||||||
| 158 | OPTICAL TRANSMISSION APPARATUS AND OPTICAL SIGNAL LEVEL CHECKING METHOD | US12815722 | 2010-06-15 | US20100315702A1 | 2010-12-16 | Hiroyuki ITOH; Takuji Maeda |
| An optical transmission node including an optical preamplifier to amplify input light and an optical postamplifier to amplify light output from the optical preamplifier, includes the optical postamplifier configured to generate amplified spontaneous emission light without signals input, the optical preamplifier configured to amplify the amplified spontaneous emission light from the optical postamplifier, a loopback switch configured to discouple a path of the light output from the optical preamplifier to the optical postamplifier, and couple a path of the light output from the optical postamplifier to the optical preamplifier. | ||||||
| 159 | Determination of the amplified spontaneous emission in an optical fibre amplifier | US11664177 | 2005-09-26 | US07817921B2 | 2010-10-19 | Lutz Rapp; Wolfgang Peisl |
| In a method for determining a power of an amplified spontaneous emission in an optical fiber amplifier for a WDM signal, wherein the optical fiber amplifier includes at least a first amplifier stage having a predetermined output power set for a measured input power, a first mean inversion is determined for the first amplifier stage. A first output power of the amplified spontaneous emission is determined at an output of the first amplifier stage by reference to tabulated values which depend on the first mean inversion. | ||||||
| 160 | Multi-stage Raman amplifier | US11802011 | 2007-05-18 | US07813034B2 | 2010-10-12 | Attilio Bragheri; Giulia Pietra; Raffaele Corsini; Danilo Caccioli |
| A Raman amplifier comprises at least a first and a second optical Raman-active fiber disposed in series with each other. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active fiber a first pump radiation including a first group of frequencies. A second pump source is connected to the second Raman-active fiber, and is adapted for emitting and coupling into the second Raman-active fiber a second pump radiation including a second group of frequencies. The whole of said first and second group of frequencies extends over a pump frequency range having a width of at least the 40% of the Raman shift. The minimum and the maximum frequency in each of said first and second group of frequencies differ with each other of at most the 70% of said Raman shift. | ||||||
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