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公开(公告)号：JP2000244399A
公开(公告)日：2000-09-08
申请号：JP2000037111
申请日：2000-02-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , JOPSON ROBERT MEACHEM , SRIVASTAVA ATUL KUMAR , SULHOFF JAMES WILLIAM , SUN YAN
IPC: H01S5/50 , H04B10/00 , H04B10/02 , H04B10/17 , H04B10/18 , H04B10/29 , H04J14/00 , H04J14/02 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To realize communication without substantially an error by detecting transmitted bits in an amplified optical signal according to detection thresholds derived as a function of the maximum power level corresponding to the first bit value and the minimum power level corresponding to the second bit value. SOLUTION: In a receiver opart 650, a band-pass filter 651 is used for selecting one channel at once for a proper measurement, for example, a BER or eye measurement. To put it concretely, bits in 12 channels using the optimal detection threshold level are detected by using a detector 652. The other components in the receiver part 650 are used for applying pre-amplification to an erbium-dopes fiber amplifier 660. A light attenuator 661 and an eye monitor 662 are used for simplifying the measurement of an input signal pattern. An attenuator 663 is used for simplifying the measurements of the power and bit error rate of a received signal.
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公开(公告)号：JP2001069085A
公开(公告)日：2001-03-16
申请号：JP2000214301
申请日：2000-07-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BANERJEE SONALI , SRIVASTAVA ATUL KUMAR , SULHOFF JAMES WILLIAM , SUN YAN
IPC: H01S5/50 , H04B10/2507 , H04B10/2543 , H04B10/293 , H04B10/294 , H04B10/564 , H04B10/572 , H04J14/00 , H04J14/02 , H04B10/14 , H04B10/02
Abstract: PROBLEM TO BE SOLVED: To compensate the gain change of an optical amplifier, to reduce a distortion and a crosstalk in a saturation area and to improve transmission efficiency and quality by introducing a reservoir optical channel having a prescribed wavelength into a communication route. SOLUTION: In a wavelength division multiplex system 400, a laser beam source 410 and a 3 dB coupler 411 or the like are utilized and the channel is inputted before the first semiconductor optical amplifier 421 of a transmitting part 420. The reservoir channel is positioned in the signal band of the optical amplifier 421, positioned in the wavelength in a spectrum in the neighborhood of the max. point of the min. point of gain change and made to be higher than a traffic channel in an initial strength level. Then gain change is reduced and the strength is shared with another channel in accordance with the change of an input strength. Thus, the channel is functioned as a reception compensating mechanism so that gain change caused by a strength fluctuation in the input of the optical amplifier, for example, the addition or erasion of the traffic channel is suppressed.
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公开(公告)号：DE69827550T2
公开(公告)日：2005-11-24
申请号：DE69827550
申请日：1998-06-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SUN YAN , SULHOFF JAMES WILLIAM , ZYSKIND JOHN LEHRER
Abstract: A wide band optical amplifier employing a split-band architecture in which an optical signal is split into several independent sub-bands which then pass in parallel through separate branches of the optical amplifier. Each branch may be optimized for the sub-band that traverses it. The independent sub-bands are combined before output, resulting in a broad band, high efficiency amplifier. Alternative, hybrid split-band amplifiers are described. As a result of their desirable characteristics, these wide band optical amplifiers may be used in dense WDM communications systems.
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公开(公告)号：CA2298272C
公开(公告)日：2003-10-28
申请号：CA2298272
申请日：2000-02-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , SUN YAN , JOPSON ROBERT MEACHEM , SULHOFF JAMES WILLIAM , SRIVASTAVA ATUL KUMAR
IPC: H01S5/50 , H04B10/00 , H04B10/02 , H04B10/17 , H04B10/18 , H04B10/29 , H04J14/00 , H04J14/02 , H04B10/16
Abstract: Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit "0", and a minimum power level associated with a second bit value, e.g., bit "1". Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gai n variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to P TOTAL/2N, where P TOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal . According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the tot al effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.
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公开(公告)号：DE60036891T2
公开(公告)日：2008-08-07
申请号：DE60036891
申请日：2000-02-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , JOPSON ROBERT MEACHEM , SRIVASTAVA ATUL KUMAR , SULHOFF JAMES WILLIAM , SUN YAN
Abstract: Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit "0", and a minimum power level associated with a second bit value, e.g., bit "1". Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to PTOTAL/2N, where PTOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal. According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the total effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.
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Patent Agency Ranking
公开(公告)号：CA2310305C
公开(公告)日：2004-04-06
申请号：CA2310305
申请日：2000-05-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BANERJEE SONALI , SRIVASTAVA ATUL KUMAR , SUN YAN , SULHOFF JAMES WILLIAM
IPC: H04B10/17
Abstract: Distortion and crosstalk that occurs when operating optical amplifiers in saturation is substantially reduced by passively compensating for gain variations caused b y changes in input power to the optical amplifiers. More specifically, in an optical communication system having one or more optical amplifiers, a "reservoir" optical channel is supplied in addition to the other traffic-carrying optical channels. The wavelength of the reservoir channel i s selected such that the power level of the reservoir channel varies in response to changes in power levels of the traffic-carrying channels. Because gain variations are typically highest around the gain peak region in an optical amplifier's gain bandwidth, the reservoir channel in one exemplary embodimen t is assigned a wavelength around the gain peak region. As such, the reservoir channel can absorb or otherwise receive most of the distortion and crosstalk while the traffic-carrying channels located away from the gain peak region will experience less distortion and crosstalk. Importantly, this passive compensation scheme can be used in an amplified system which is operating in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk.
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公开(公告)号：DE60036891D1
公开(公告)日：2007-12-13
申请号：DE60036891
申请日：2000-02-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , JOPSON ROBERT MEACHEM , SRIVASTAVA ATUL KUMAR , SULHOFF JAMES WILLIAM , SUN YAN
Abstract: Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit "0", and a minimum power level associated with a second bit value, e.g., bit "1". Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to PTOTAL/2N, where PTOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal. According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the total effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.
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公开(公告)号：AU1643000A
公开(公告)日：2000-08-24
申请号：AU1643000
申请日：2000-02-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , SUN YAN , SULHOFF JAMES WILLIAM , SRIVASTAVA ATUL KUMAR , JOPSON ROBERT MEACHEM
Abstract: Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit "0", and a minimum power level associated with a second bit value, e.g., bit "1". Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to PTOTAL/2N, where PTOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal. According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the total effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.
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公开(公告)号：DE69827550D1
公开(公告)日：2004-12-23
申请号：DE69827550
申请日：1998-06-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , SUN YAN , SULHOFF JAMES WILLIAM , ZYSKIND JOHN LEHRER
Abstract: A wide band optical amplifier employing a split-band architecture in which an optical signal is split into several independent sub-bands which then pass in parallel through separate branches of the optical amplifier. Each branch may be optimized for the sub-band that traverses it. The independent sub-bands are combined before output, resulting in a broad band, high efficiency amplifier. Alternative, hybrid split-band amplifiers are described. As a result of their desirable characteristics, these wide band optical amplifiers may be used in dense WDM communications systems.
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公开(公告)号：CA2310305A1
公开(公告)日：2000-12-07
申请号：CA2310305
申请日：2000-05-30
Applicant: LUCENT TECHNOLOGIES INC
Inventor： SRIVASTAVA ATUL KUMAR , BANERJEE SONALI , SULHOFF JAMES WILLIAM , SUN YAN
IPC: H04B10/17
Abstract: Distortion and crosstalk that occurs when operating optical amplifiers in saturation is substantially reduced by passively compensating for gain variations caused by changes in input power to the optical amplifiers. More specifically, in an optical communication system having one or more optical amplifiers, a "reservoir" optical channel is supplied in addition to the other traffic-carrying optical channels. The wavelength of the reservoir channel is selected such that the power level of the reservoir channel varies in response to changes in power levels of the traffic-carrying channels. Because gain variations are typically highest around the gain peak region in an optical amplifier's gain bandwidth, the reservoir channel in one exemplary embodiment is assigned a wavelength around the gain peak region. As such, the reservoir channel can absorb or otherwise receive most of the distortion and crosstalk while the traffic-carrying channels located away from the gain peak region will experience less distortion and crosstalk. Importantly, this passive compensation scheme can be used in an amplified system which is operating in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk.
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