Dr. Yang Zhang Profile

Dr. Yang Zhang

at Tsinghua Univ

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Proceedings Article | 28 January 2006 Paper

Experimental mitigation of pulse distortion due to higher order polarization mode dispersion

Changxi Yang, Yang Zhang, Shiguang Li

Proceedings Volume 6025, 60250Y (2006) https://doi.org/10.1117/12.667036

KEYWORDS: Polarization, Distortion, Feedback signals, Birefringence, Picosecond phenomena, Crystals, Magneto-optics, Binary data, Neodymium, Optical fibers

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Polarization mode dispersion (PMD) is becoming major system impairment in high speed and long distance optical fiber transmission systems. As the bit rate climbs from 10 to 40Gb/s per channel and beyond, optical pulses are increasingly distorted by 1st and higher order PMD. We report on the experimental mitigation of pulse distortion due to 1st and higher order PMD effect based on one tunable differential group delay (DGD) element, which is a compact concatenation via six magneto-optic polarization rotators (Faraday rotators) of six YVO₄ birefringence crystals whose lengths decrease in a binary power series. Two different experiments are carried out, with and without an electric polarization controller set before the tunable DGD element. Optical pulses with width of 41ps are broadened and distorted by the PMD emulator which generates 1st and 2nd order PMD with mean magnitude of 30.28 ps and 483.31 ps², respectively, and then reshaped by the compensation device. Degree of polarization (DOP) is used as the feedback signal, which is significantly increased from around 0.15 to around 0.85. The experiment results show that pulse distortion due to 1st and higher order PMD is successfully mitigated.

Proceedings Article | 9 December 2005 Paper

Polarization mode dispersion compensation experiments in 10 Gb/s and 40 Gb/s optical communication systems

Yang Zhang, Shiguang Li, Changxi Yang

Proceedings Volume 6021, 602122 (2005) https://doi.org/10.1117/12.633991

KEYWORDS: Polarization, Telecommunications, Optical communications, Feedback signals, Picosecond phenomena, Birefringence, Crystals, Feedback control, Optical fibers, Multiplexing

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Polarization mode dispersion is becoming major system impairment in high speed and long distance optical fiber transmission systems. As the bit rate climbs from 10 to 40 Gb/s per wavelength division multiplexed channel and beyond, optical pulses are increasingly distorted by polarization mode dispersion effect. We report on polarization mode dispersion compensation experiments in 10 Gb/s, 40 Gb/s optical communication systems. The polarization mode dispersion compensator used in the experiments is a compact variable differential group delay element base on concatenation via six magneto-optic polarization rotators (Faraday rotators) of six YVO₄ birefringence crystals whose lengths decrease in a binary power series. Feedback scheme is used to optimize the performance of polarization mode dispersion compensation, using degree of polarization as the feedback signal. In the experiments in 10 Gb/s and 40 Gb/s optical transmission systems, eye-diagrams and bit error rate curves of the code sequences before and after polarization mode dispersion compensation are analyzed. The experimental results demonstrate that the polarization mode dispersion effect induced by the polarization mode dispersion emulator is feasibly mitigated. Separate experiment to reshape the 39ps pulses distorted by polarization mode dispersion is also carried out. The incident optical pulses with width of 39ps are broadened and distorted by polarization mode dispersion effect and then reshaped by the polarization mode dispersion compensator. The relationship between the feedback signal degree of polarization and differential group delay is also analyzed.

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