Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1999-01-07
2000-10-10
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359122, 359156, H04B 1000
Patent
active
061307661
ABSTRACT:
A polarization mode dispersion (PMD) compensator compensates for PMD in an optical signal by an automatic tracking of a principal state of polarization (PSP). A polarization controller (PC) receives a dithering optical signal including first and second principal states of polarization (PSPs) and PMD distortion received by the PMD compensator. The PC transforms the first and second PSPs into linearly polarized components, and is responsive to a feedback control signal for aligning the linearly polarized first and second PSPs to first and second polarization axes of the PBS, respectively. A polarization beam splitter (PBS) directs first polarized components of the received dithering optical signal onto a first output path, and directs second orthogonally polarized components of the received dithering optical signal onto a second output path for transmission as a PMD compensator output signal. A compensation control arrangement is responsive to both the received dithering optical signal and the first polarized components from the PBS for measuring interference characteristics of the two PSPs, and for generating the feedback control signal to the PC for aligning each of the PSPs with a corresponding one of first and second polarization axes of the PBS based on the measured interference characteristics.
REFERENCES:
patent: 5659412 (1997-08-01), Hakki
patent: 5822100 (1998-10-01), Robinson et al.
patent: 5859939 (1999-01-01), Fee et al.
B. W. Hakki, "Polarization Mode Dispersion Compensation by Phase Diversity Detection", IEEE Photonics Technology Letters, vol. 9, No. 1, Jan. 1997, pp. 121-123.
Article entitled "Polarization Mode Dispersion: Fundamentals and Impact on Optical Communication Systems" by F. Heismann, European Conference on Optical Communication (ECOC'98) vol. 2, pp. 51-79, 1998.
Article entitled "Finer-Based Distributed PMD Compensation at 20 GB/S" by R. Now et al., 1993, Europan Conference on Optical Communication (ECOC'98), vol. 3, pp. 157-159, 1998.
Article entitled "Electronic Equalization of Fier PMD-Induced distortion at 10 Gbit/s" by H. Bulow et al., Optical Fiber Communication Technical Digest (OFC'98), pp. 151-152, 1998.
Negash Kinfe-Michael
Ostroff Irwin
Pheifle Erwin W.
Qtera Corporation
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