Optical communications – Transmitter and receiver system – Including polarization
Reexamination Certificate
2007-02-06
2007-02-06
Leung, Christina (Department: 2613)
Optical communications
Transmitter and receiver system
Including polarization
C398S029000
Reexamination Certificate
active
10825529
ABSTRACT:
An apparatus for measuring a set of frequency-resolved states of polarization (SOP) of an optical signal includes a local oscillator (LO), a polarization scrambler, a coupler for mixing the polarization-scrambled signal with the optical signal to produce a heterodyned signal with a radio frequency (RF) component, and an analyzer for passing a fixed polarization component and resolving the polarization and frequency from the RF component. The apparatus is used for measuring, monitoring or compensating the polarization mode dispersion (PMD) in a working channel of an optical telecommunication system. A method for measuring frequency-resolved SOP of an optical signal includes tuning and polarization-scrambling a local oscillator (LO), mixing the scrambled LO with the optical signal, and resolving the RF signal in frequency and polarization. The method is applied to measure and monitor PMD in a working optical channel, and to dynamically compensate for the PMD.
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Boroditsky Mikhail
Brodsky Mikhail
Frigo Nicholas J.
Magill Peter
AT&T Corp.
Leung Christina
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