Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2007-11-27
2007-11-27
Tran, Dzung (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S077000, C398S149000
Reexamination Certificate
active
11117228
ABSTRACT:
Methods, apparatus, and systems for an optical communication channel. A data signal is preconditioned prior to transmission over a fiber optic cable to minimize signal distortion and transmitted over a fiber optic cable. Preconditioning may include none, one or more, or all of the following: encoding the data signal using a run length limited code, correlating bits of the data signal, and spreading out the pulses in the time-domain in the data signal. The pulse spreading function can be implemented either in the electrical domain prior to the electrical-to-optical conversion; in the optical domain during and/or after the electrical-to-optical conversion; or a combination of both. During reception, the data signal and clock are recovered. Recovery may include maintaining an amplitude in an electrical signal, filtering the electrical signal, shaping the electrical signal, and removing distortions and intersymbol interference (ISI) from the received electrical signal.
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Elahmadi Salam
Elahmadi Siraj Nour
Blakely , Sokoloff, Taylor & Zafman LLP
Menara Networks
Tran Dzung
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