Optical communications – Receiver – Heterodyne
Reexamination Certificate
2007-04-17
2007-04-17
Tran, Dzung (Department: 2613)
Optical communications
Receiver
Heterodyne
C398S207000, C398S213000
Reexamination Certificate
active
10128939
ABSTRACT:
A photomultiplier module (PMT), preferably a PMT with a gallium arsenide (GaAs) photocathode, is used as a N-photon detector (N is an integer ≧2). The PMT detects the N-photon absorption rate of an optical signal having a wavelength range extending from 1.0 μm to an upper wavelength region that increases as the number of photons simultaneously absorbed by the PMT increases beyond two. The N-photon absorption rate is used by a signal compensation apparatus to reduce impairments which affect the rate, such as group velocity dispersion and/or polarization mode dispersion, in a received optical pulse communication signal. The N-photon absorption rate can also be used to determine the optical signal-to-noise ratio of a received optical pulse communication signal, and/or to synchronize a second optical pulse signal with the first optical signal.
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Garcia Hernando
Kilper Daniel Charles
Roth Jeffrey Matthew
Xu Chunhui
Freedman Barry H.
Lucent Technologies - Inc.
Tran Dzung
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