Optical communications – Multiplex – Code division multiplexing
Reexamination Certificate
2004-09-02
2008-09-02
Tran, Dzung D (Department: 2613)
Optical communications
Multiplex
Code division multiplexing
C398S076000, C398S189000
Reexamination Certificate
active
07421204
ABSTRACT:
A method and system for increasing the spectral efficiency of binary coded signals includes encoding an input binary bit sequence such that the input binary bit sequence is converted into a series of rectangular pulses having varying repetition rates. A continuous wave carrier signal is then modulated via a control signal representative of the encoded signal. The modulated optical signal is filtered by a narrow band optical filter to generate a minimum shift keying (MSK) encoded optical signal. In accordance with the present invention, an input binary bit sequence is encoded via a minimum shift keying (MSK) modulation format to improve the spectral efficiency of a binary coded digital signal and to contemporaneously limit distortion of the optical signal induced by optical nonlinear effects during transmission in an optical transmission system.
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Lucent Technologies - Inc.
Tran Dzung D
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