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

IPC: H04B10/02 ,  H04B3/06 ,  H04B10/18

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.

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

IPC: H04B10/02 ,  H04B10/18

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.

公开(公告)号：JP2000277834A

公开(公告)日：2000-10-06

申请号：JP2000063059

申请日：2000-03-08

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BERGER MATTHIAS ,  BODE DIRK ,  FISHMAN DANIEL A ,  LIVESCU GABRIELA ,  RAABE CHRISTIAN ,  SHEHADEH FATIMAH ,  ZHOU JIANHUI ,  ZIRNGIBL MARTIN

IPC: G02F1/35 ,  H01S3/06 ,  H01S3/10 ,  H01S3/30 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02 ,  H04B10/16

Abstract: PROBLEM TO BE SOLVED: To compensate for Raman effect by producing a gain inclined against Raman inclination in advance and applying the inclined gain to the spectrum of optical signals transmitted through an optical fiber. SOLUTION: A gain inclined against Raman inclination in advance is produced and the inclined gain is applied to the spectrum of optical signals transmitted through an optical fiber. For example, when an optical signal is transmitted from the output of an optical amplifier 100-i, e.g. 100-1, the gain is inclined at the low end of spectrum. Then a receiving optical amplifier, for example, an amplifier 100-2 amplifies a received signal and processes it again so that the power level of the optical signal is preliminarily inclined against Raman inclination produced in a transmitted light transmission line. With this constitution Raman effect can be offset.

公开(公告)号：DE69802495T2

公开(公告)日：2002-06-27

申请号：DE69802495

申请日：1998-12-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DENKIN NATHAN MYRON ,  FISHMAN DANIEL A ,  FANG WEI-CHIAO WILLIAM

IPC: G02F1/01 ,  H04B10/00 ,  H04B10/02 ,  H04L1/22 ,  H04M3/22 ,  H04Q3/52 ,  H04B10/08 ,  H04B10/24 ,  H04J14/02

Abstract: A protection facility is provided for use in an optical communications node that communicates with another optical communications node via first and second bi-directional communications paths respectively serving as a service path and protection path, in which a filter filters signals respectively received over the service and protection paths and generates a main signal and a complementary signal for each of the paths. A control unit then generates a Loss of Signal (LOS_A) indication for the service path if a SUM signal or DIFF signal respectively derived as a function of a sum of the main and complementary signals generated for the service path and difference between the main and complementary signals generated for the service path is less than a respective threshold value. A switch then invokes protection switching responsive to the presence of the LOS_A indication.

公开(公告)号：DE60034618T2

公开(公告)日：2008-01-31

申请号：DE60034618

申请日：2000-02-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BERGER MATTHIAS ,  BODE DIRK ,  FISHMAN DANIEL A ,  LIVESCU GABRIELA ,  RAABE CHRISTIAN ,  SHEHADEH FATIMAH ,  ZHOU JIANHUI ,  ZIRNGIBL MARTIN

IPC: G02F1/35 ,  H04B10/17 ,  H01S3/06 ,  H01S3/10 ,  H01S3/30 ,  H04B10/02 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

Abstract: An optical amplifier is adapted to cancel the Raman gain of an optical transmission path that degrades those optical signals occupying the low end of the bandwidth such that the power is transferred from the latter signals to the optical signals occupying the high end of the bandwidth. More specifically, the optical amplifier adjusts the gain that it applies to the optical signals so that it favors the signal components at the low end of the bandwidth.

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.

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

公开(公告)号：DE602005000871D1

公开(公告)日：2007-05-24

申请号：DE602005000871

申请日：2005-09-22

Applicant: LUCENT TECHNOLOGIES INC

Inventor： FISHMAN DANIEL A ,  LIU XIANG ,  WEI XING ,  YING JINPIN

IPC: H04B10/18 ,  H04J14/02

Abstract: A dispersion compensator apparatus including interleavers for deinterleaving/interleaving even and odd channels of a WDM signal, and dispersion compensation modules (DCMs) coupled between the interleavers. One or more of the DCMs is a periodic-group-delay (PGD) DCMs for providing dispersion compensation.

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.

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

IPC: H04B10/02 ,  H04B10/18

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.