Multiformat transmitter

Details Multiformat transmitter Multiformat transmitter

2006-02-08

2009-06-30

Singh, Dalzid (Department: 2613)

Optical communications

Transmitter

Having particular modulation

C398S091000, C398S185000, C398S198000

Reexamination Certificate

active

07555222

ABSTRACT:
Methods and apparatus for supporting a plurality of modulation formats using a single transmitter are disclosed. According to one aspect of the present invention, a transmitter arrangement that provides a signal to a modulator that creates an optical data stream from the signal includes an encoder and a switching/filtering arrangement. The encoder has a state that is varied between first and second encoder states. If the state is the first encoder state, the encoder encodes the signal in a format associated with an optical duobinary (ODB) modulation format. Otherwise, the encoder does not encode the signal in the format associated with the ODB modulation format. The switching/filtering arrangement receives the signal from the encoder, and provides the signal to the modulator. If the variable state of the encoder is the first encoder state, the switching/filtering arrangement has a low bandpass configuration. Otherwise, the switching/filtering arrangement has a high bandpass configuration.

REFERENCES:
patent: 2004/0076439 (2004-04-01), Lee et al.
patent: 2004/0202134 (2004-10-01), Khawand
patent: 2004/0223766 (2004-11-01), Lanne et al.
patent: 2007/0080833 (2007-04-01), Yabuno et al.

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