Optical communications – Transmitter and receiver system – Including polarization
Reexamination Certificate
2002-12-03
2008-10-28
Vanderpuye, Kenneth (Department: 2613)
Optical communications
Transmitter and receiver system
Including polarization
C398S152000, C398S158000, C398S148000, C398S147000, C398S159000
Reexamination Certificate
active
07444082
ABSTRACT:
A method for the adaptive adjustment of a PMD compensator in optical fiber communication systems comprises the steps of taking the signal at the compensator output and extracting the components y1(t) and y2(t) on the two orthogonal polarizations, computing the signal y(t)=[y1(t)]2+[y2(t)]2, sampling the signal y(t) at instants tk=kT with T=symbol interval to obtain samples y(tk), computing the mean square error e(k)=y(tk)−u(k) with u(k) equal to the symbol transmitted, and adjusting the parameters of the compensator to seek to minimize e(k). A PMD compensator in accordance with the method comprises an adjustment system which comprises in turn a photodetecor (17) which takes the components y1(t) and y2(t) on the two orthogonal polarizations from the signal at the compensator output, a sampler (19) which samples at instants tk=kT with T=symbol interval, the signal y(t)=[y1(t)]2+[y2(t)]2at the output of the photodetector (17) to obtain samples y(tk), a circuit (18, 20) for computation of the mean square error e(k)=y(tk)−u(k) with u(k) equal to the symbol transmitted, and a regulator (15, 16) which regulates the parameters of the compensator to seek to minimize e(k).
REFERENCES:
patent: 6115419 (2000-09-01), Meehan
patent: 6728491 (2004-04-01), Ooi et al.
patent: 6768875 (2004-07-01), Eiselt et al.
patent: 6782211 (2004-08-01), Core
patent: 0 725 477 (1996-08-01), None
Automatic Polarisation Mode Dispersion Compensation in 40 GBit/s Optical Transmission System Electronics Letters, IEE Stevenage, BG, D, Sandel, et al., vol. 34, No. 23, Nov. 12, 1998, pp. 2258-2259.
Adaptive PMD Mitigation at 10 GBits/s Using an Electronic Sige Equaliser IC, 25thEuropean Conference on Optical Communication, (ECOC'99) Nice, France, H. Buelow, et al., Sep. 27-30, 1999, Regular and Invited Papers, European Conference on Optical Communication (ECOC), Paris, FR, vol. II or II, Sep. 26, 1999, pp. II-138-II-139.
Colavolpe Giulio
Forestieri Enrico
Prati Giancarlo
Ericsson AB
Kirschstein et al.
Vanderpuye Kenneth
Woldekidan Hibret A
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