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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：JP2000244404A
公开(公告)日：2000-09-08
申请号：JP2000043229
申请日：2000-02-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , EICHENBAUM BERNARD RAYMOND , EMERY GARY PATRICK , HABER JANICE BILECKY , KALISH DAVID , RAYMOND BRADFIELD
Abstract: PROBLEM TO BE SOLVED: To provide an optical transmission system that adopts a signal mode fiber system to avoid interference between a wavelength division multiplex WDM signal and an analog television TV signal. SOLUTION: This wavelength division multiplex system has a 1st multiplexer 112 that connects a plurality of digital information channels to a transmission path and the transmission path including an optical fiber 130 whose zero dispersion wavelength λ0 is 1310 nm and whose length exceeds a span to 10 km. The loss of the optical fiber at 1385 nm is smaller than the loss at 1310 nm, and color element dispersion at a 1.4 μm wavelength band is within a range of 1.5-8.0 ps/nm.km, and the 1st multiplexer 112 gives three or more channels of wavelength division multiplex signals within the 1.4 μm wavelength band to the transmission path.
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公开(公告)号：AU757989B2
公开(公告)日：2003-03-13
申请号：AU1754500
申请日：2000-02-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , EICHENBAUM BERNARD RAYMOND , EMERY GARY PATRICK , HABER JANICE BILECKY , KALISH DAVID , KUMMER RAYMOND BRADFIELD
Abstract: A high-capacity optical fiber network Ä100, 200Ü includes wavelength-division multiplexing (WDM) within the 1.4 micron ( mu m) wavelength region (i.e., 1335-1435 nm). Such a system includes optical fiber Ä130Ü whose peak loss in the 1.4 mu m region is less than its loss at 1310 nm. The optical fiber has a zero dispersion wavelength ( lambda 0) at about 1310 nm, and linear dispersion between about 1.5 and 8.0 ps/nm-km within the 1.4 mu m region. At least three WDM channels operate at 10 Gb/s in the 1.4 mu m wavelength region and have a channel separation of 100 GHz. In one illustrative embodiment of the invention, a broadcast television channel, having amplitude modulated vestigial sideband modulation, simultaneously operates in the 1.3 mu m region (i.e., 1285-1335 nm) and/or the 1.55 mu m region (i.e., 1500-1600 nm). In another embodiment of the invention, 16 digital data channels are multiplexed together in the 1.55 mu m region, each channel operating at about 2.5 Gb/s. Raman amplifiers Ä103, 113Ü are used for amplification in the 1.3 mu m and the 1.4 mu m wavelength regions, whereas an Erbium amplifier Ä123Ü is used for amplification in the 1.55 mu m wavelength region.
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公开(公告)号：CA2296945A1
公开(公告)日：2000-08-19
申请号：CA2296945
申请日：2000-01-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： EICHENBAUM BERNARD RAYMOND , EMERY GARY PATRICK , CHRAPLYVY ANDREW ROMAN , KUMMER RAYMOND BRADFIELD , KALISH DAVID , HABER JANICE BILECKY
Abstract: A high-capacity optical fiber network ¢100, 200! includes wavelength-division multiplexing (WDM) within the 1.4 micron (.mu.m) wavelength region (i.e., 13351435 nm). Such a system includes optical fiber ¢130! whose peak loss in the 1.4 .mu.m region is less than its loss at 1310 nm. The optical fiber has a zero dispersion wavelength (.lambda.0) at about 1310 nm, and linear dispersion between about 1.5 and 8.0 ps/nm-km within the 1.4 .mu.m region. At least three WDM channels operate at 10 Gb/s in the 1.4 .mu.m wavelength region and have a channel separation of 100 GHz. In one illustrative embodiment of the invention, a broadcast television channel, having amplitude modulated vestigial sideband modulation, simultaneously operates in the 1.3 .mu.m region (i.e., 1285-1335 nm) and/or the 1.55 .mu.m region (i.e., 1500-1600 nm). In another embodiment of the invention, 16 digital data channels are multiplexed together in the 1.55 .mu.m region, each channel operating at about 2.5 Gb/s. Raman amplifiers ¢103, 113! are used for amplification in the 1.3 .mu.m and the 1.4 .mu.m wavelength regions, whereas an Erbium amplifier ¢123! is used for amplification in the 1.55 .mu.m wavelength region.
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公开(公告)号：AT316722T
公开(公告)日：2006-02-15
申请号：AT04250980
申请日：2004-02-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHANDRASEKHAR SETHUMADHAVAN , CHRAPLYVY ANDREW ROMAN , DOERR CHRISTOPHER RICHARD , WINZER PETER J
Abstract: An improved multi-channel optical equalizer method and apparatus for intersymbol interference mitigation compensates for single- or multi- wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer can also compensate for overshoots and signal transition degradations of a semiconductor optical amplifier. The equalizer unit has only two control signals, one to control signal magnitude and one to control signal phase, yet it can still compensate many wavelength channels simultaneously. The equalizer includes a coupler with a controllable coupling ratio for splitting the light into two portions and a controllable interferometer means having two arms, one arm having an additional delay which is equal to an integer multiple of 1/ DELTA f, where DELTA f is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer unit also has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. In a second embodiment, the equalizer includes two equalizer units connected in series to compensate for both leading and lagging intersymbol interference.
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Patent Agency Ranking
公开(公告)号：DE60009974D1
公开(公告)日：2004-05-27
申请号：DE60009974
申请日：2000-02-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHRAPLYVY ANDREW ROMAN , EICHENBAUM BERNARD RAYMOND , EMERY GARY PATRICK , HABER JANICE BILECKY , KALISH DAVID , KUMMER RAYMOND BRADFIELD
Abstract: A high-capacity optical fiber network Ä100, 200Ü includes wavelength-division multiplexing (WDM) within the 1.4 micron ( mu m) wavelength region (i.e., 1335-1435 nm). Such a system includes optical fiber Ä130Ü whose peak loss in the 1.4 mu m region is less than its loss at 1310 nm. The optical fiber has a zero dispersion wavelength ( lambda 0) at about 1310 nm, and linear dispersion between about 1.5 and 8.0 ps/nm-km within the 1.4 mu m region. At least three WDM channels operate at 10 Gb/s in the 1.4 mu m wavelength region and have a channel separation of 100 GHz. In one illustrative embodiment of the invention, a broadcast television channel, having amplitude modulated vestigial sideband modulation, simultaneously operates in the 1.3 mu m region (i.e., 1285-1335 nm) and/or the 1.55 mu m region (i.e., 1500-1600 nm). In another embodiment of the invention, 16 digital data channels are multiplexed together in the 1.55 mu m region, each channel operating at about 2.5 Gb/s. Raman amplifiers Ä103, 113Ü are used for amplification in the 1.3 mu m and the 1.4 mu m wavelength regions, whereas an Erbium amplifier Ä123Ü is used for amplification in the 1.55 mu m wavelength region.
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公开(公告)号：CA2298272A1
公开(公告)日：2000-08-19
申请号：CA2298272
申请日：2000-02-08
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: 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 "I". 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 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 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：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：DE602004000348D1
公开(公告)日：2006-04-13
申请号：DE602004000348
申请日：2004-02-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHANDRASEKHAR SETHUMADHAVAN , CHRAPLYVY ANDREW ROMAN , DOERR CHRISTOPHER RICHARD , WINZER PETER J
Abstract: An improved multi-channel optical equalizer method and apparatus for intersymbol interference mitigation compensates for single- or multi- wavelength channels simultaneously and requires few adjustable parameters. The optical equalizer can also compensate for overshoots and signal transition degradations of a semiconductor optical amplifier. The equalizer unit has only two control signals, one to control signal magnitude and one to control signal phase, yet it can still compensate many wavelength channels simultaneously. The equalizer includes a coupler with a controllable coupling ratio for splitting the light into two portions and a controllable interferometer means having two arms, one arm having an additional delay which is equal to an integer multiple of 1/ DELTA f, where DELTA f is the channel spacing between adjacent wavelengths utilized in the optical system. The controllable interferometer unit also has a controllable delay in a first or second arm for adjusting the relative phase of the light passing therethrough. A coupler combines the two signal portions from the first and second arms to form the equalized output signal. In a second embodiment, the equalizer includes two equalizer units connected in series to compensate for both leading and lagging intersymbol interference.
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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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