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公开(公告)号：JPH11196046A
公开(公告)日：1999-07-21
申请号：JP26073898
申请日：1998-09-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISHMAN DANIEL A , HEISMANN FRED LUDWIG , WILSON DAVID L
Abstract: PROBLEM TO BE SOLVED: To provide a device which can automatically fit a primary polarization mode dispersion(PMD) level by producing a control signal proportional to the total value of the differential optical time delay of the optical signal occurring at the output part of a variable birefringence element via an optical signal analyzer and controlling the differential time delay value, which is generated for the control of selecting a specific orthogonal polarization state by means of the control signal. SOLUTION: Automatic fitting is attained to a PMD level, via the differential time delay of a variable differential time delay line 50 and the supply of a feedback signal, that controls the polarization transformation of a polarization transformer 30. Some of signals which are outputted from a compensation device 25 are supplied to a path 87 which reaches a fast photodetection device 55 via an optical tap 85, and other signals are supplied to a path 86 reaching a receiver 90. The device 55 converts the fast digital information signal modulated on an optical carrier signal into an electric signal. The electric signal is amplified by an amplifier 60 and sent to an electrical distortion analyzer 70 which measures the distortion of the amplified optical current and coverts the amplified result into a voltage that is proportional to the measured distortion.
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公开(公告)号：JP2001211120A
公开(公告)日：2001-08-03
申请号：JP2000381365
申请日：2000-12-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISHMAN DANIEL A , HEISMANN FRED L , WILSON DAVID L
Abstract: PROBLEM TO BE SOLVED: To provide a compensator which compensates polarization mode dispersion. SOLUTION: A receiver compensates the influence of the polarization dispersion on an optical signal during propagation in an optical fiber by using a birefringence compensator. A distortion analyzer inspects the signal outputted from the compensator, which operates based on the inspection result to reduce the influence of polarization compensation dispersion.
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公开(公告)号：CA2449694C
公开(公告)日：2004-08-31
申请号：CA2449694
申请日：2000-12-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISHMAN DANIEL A , HEISMANN FRED LUDWIG , WILSON DAVID L
IPC: H04B10/07 , G01R23/20 , H04B10/2507 , H04B10/08 , H04B10/18
Abstract: The present invention relates to a distortion analyzer that is comprised of a converter for converting a signal outputted by optical apparatus into an electrical signal and splitting the converted signal into a plurality of signals. The analyzer also includes first, second, and third analyzer sections for receiving respective ones of the plurality of signals such that the first analyzer section operates to pass the entire spectrum of the outputted signal, the second section operates to pass only that portion of the entire spectrum that is below a predetermined frequency and the third section operates to pass a predetermined band of the entire spectrum. A summing unit is provided for summing the outputs of the first and second sections and subtracting the output of the third section from the summed result to generate a distortion indicator and supplying the distortion indicator to the optical apparatus.
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公开(公告)号：CA2449694A1
公开(公告)日：2001-06-16
申请号：CA2449694
申请日：2000-12-06
Applicant: LUCENT TECHNOLOGIES INC , HATCH LTD
Inventor： HEISMANN FRED LUDWIG , FISHMAN DANIEL A , WILSON DAVID L
IPC: H04B10/07 , G01R23/20 , H04B10/2507 , H04B10/08 , H04B10/18
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公开(公告)号：NO984185A
公开(公告)日：1999-03-17
申请号：NO984185
申请日：1998-09-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISCHMAN DANIEL A , HEISMANN FRED LUDWIG , WILSON DAVID L
CPC classification number: H04B10/2569
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Patent Agency Ranking
公开(公告)号：CA2327709C
公开(公告)日：2004-10-19
申请号：CA2327709
申请日：2000-12-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISHMAN DANIEL A , HEISMANN FRED LUDWIG , WILSON DAVID L
Abstract: The effect of polarization mode dispersion that an optical signal experience s as it propagates through an optical transmission fiber is compensated for at a receiver using a birefringent compensator, in which a distortion analyzer repeatedly examines the signal outputted by the compensator and causes the compensator to reduce the effect of such polarization mode dispersion based on the results of such examination.
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公开(公告)号：CA2450499C
公开(公告)日：2004-08-10
申请号：CA2450499
申请日：2000-12-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WILSON DAVID L , HEISMANN FRED LUDWIG , FISHMAN DANIEL A
IPC: H04B10/07 , G01R23/20 , H04B10/2507 , H04B10/08 , H04B10/18
Abstract: The present invention relates to a distortion analyzer. The distortion analyzer is comprised of a converter for converting a signal outputted by optical apparatus into an electrical signal. A receiver is provided for converting the electrical signal into AC and DC components, for splitting the AC component signal into a plurality of signals, and for supplying the AC component signals to respective sections of a distortion analyzer. A squaring unit is provided for squaring the vague of the DC component. A divider divides the output from the distortion analyzer by the value of the squared signal and supplies the resulting quotient signal as a distortion indicator to the optical apparatus. The optical apparatus is responsive to receipt of the distortion indicator, and changes the level of the outputted signal until the distortion indicator reaches a predetermined state.
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8.发明专利
公开(公告)号：CA2245303A1
公开(公告)日：1999-03-16
申请号：CA2245303
申请日：1998-08-19
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISHMAN DANIEL A , HEISMANN FRED LUDWIG , WILSON DAVID L
Abstract: The effect of polarization mode dispersion that an optical signal experiences as it propagates through an optical transmission fiber is compensated for at a receiver using a birefringent compensator, in which the compensator automatically and adaptively generates a level of differential time delay that substantially equals the differential time delay that the optical signal experiences, but of different sign, and, therefore, essentially cancels out the undesired delay.
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公开(公告)号：CA2450499A1
公开(公告)日：2001-06-16
申请号：CA2450499
申请日：2000-12-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISHMAN DANIEL A , HEISMANN FRED LUDWIG , WILSON DAVID L
IPC: H04B10/07 , G01R23/20 , H04B10/2507 , H04B10/08 , H04B10/18
Abstract: The present invention relates to a distortion analyzer. The distortion analyzer is comprised of a converter for converting a signal outputted by optical apparatus into an electrical signal. A receiver is provided for converting the electrical sign al into AC and DC components, for splitting the AC component signal into a plurality of signals, and for supplying the AC component signals to respective sections of a distortion analyzer. A squaring unit is provided for squaring the vague of the DC component. A divider divides the output from the distortion analyzer by the value of the squared signal a nd supplies the resulting quotient signal as a distortion indicator to the optical apparatus . The optical apparatus is responsive to receipt of the distortion indicator, and changes the level of the outputted signal until the distortion indicator reaches a predetermined stat e.
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10.发明专利
公开(公告)号：CA2327709A1
公开(公告)日：2001-06-16
申请号：CA2327709
申请日：2000-12-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： FISHMAN DANIEL A , HEISMANN FRED LUDWIG , WILSON DAVID L
Abstract: The effect of polarization mode dispersion that an optical signal experience s as it propagates through an optical transmission fiber is compensated for at a receiver using a birefringent compensator, in which a distortion analyzer repeatedly examines the signal outputted by the compensator and causes the compensator to reduce the effect of such polarization mode dispersion based on the results of such examination.
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