Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2008-01-29
2008-01-29
Phan, Hanh (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S182000, C398S185000, C398S186000, C398S187000, C398S188000, C398S189000, C398S190000, C398S191000, C398S192000, C398S193000, C398S194000, C398S195000, C398S198000, C398S196000, C398S197000, C398S202000, C398S208000, C398S209000, C398S206000, C359S245000, C359S246000, C359S240000
Reexamination Certificate
active
10789586
ABSTRACT:
An optical RZ transmitter comprises an optical signal source and a pair of electro-optical modulators in tandem, one arranged to receive a NRZ electrical data signal and the other a clock signal at the data rate of the data signal. The phase difference between the data signal and the clock signal is controlled by adding a first dither signal to a bias signal applied to the modulator receiving the data signal, and a second dither signal, having a different frequency, to the phase difference. The amplitude of variations in the power of the optical output signal corresponding to cross-modulation of the first and second dither signals is detected and the phase difference is controlled in response to the detected amplitude.
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Gronbach Siegfried
Weisser Stefan
Lucent Technologies - Inc.
Phan Hanh
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