The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 2008
Filed:
Dec. 03, 2002
Giulio Colavolpe, Parma, IT;
Enrico Forestieri, Parma, IT;
Giancarlo Prati, Parma, IT;
Ericsson AB, Stockholm, SE;
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 y(t) and y(t) on the two orthogonal polarizations, computing the signal y(t)=[y(t)]+[y(t)], sampling the signal y(t) at instants t=kT with T=symbol interval to obtain samples y(t), computing the mean square error e(k)=y(t)−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 () which takes the components y(t) and y(t) on the two orthogonal polarizations from the signal at the compensator output, a sampler () which samples at instants t=kT with T=symbol interval, the signal y(t)=[y(t)]+[y(t)]at the output of the photodetector () to obtain samples y(t), a circuit () for computation of the mean square error e(k)=y(t)−u(k) with u(k) equal to the symbol transmitted, and a regulator () which regulates the parameters of the compensator to seek to minimize e(k).