Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2007-09-04
2007-09-04
Leung, Christina (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S027000, C398S189000, C398S204000
Reexamination Certificate
active
10954108
ABSTRACT:
The delay setting of an optical delay line interferometer (DLI) used to decode differentially encoded phase shift keyed signals (DPSK or DQPSK) is controlled using a control signal representative of the ratio Perr2/Perr1of the rate of occurrence of double errors and the rate of occurrence of errors. The ratio Perr2/Perr1, as the delay setting of the DLI is varied, exhibits a characteristic W-shaped structure consisting of a local maximum at the optimum value and two minima adjacent to the maximum, one on each side of it. This structure is present over a wide range of signal to noise ratio and residual dispersion.
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Haunstein Herbert
Schlenk Ralph
Leung Christina
Lucent Technologies - Inc.
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