Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2005-10-04
2005-10-04
Bello, Agustin (Department: 2633)
Optical communications
Transmitter
Having particular modulation
C398S188000
Reexamination Certificate
active
06952534
ABSTRACT:
A system and method for generating return-to-zero (RZ) optical data in a digital lightwave communications system using a two-stage modulator arrangement. RF electrical data is provided to a first stage modulator for modulating a light input into an intermediary optical data output having a non-return-to-zero (NRZ) format. Phase differences between the data and a clock signal associated therewith are controlled via a phase feedback control loop that is operable responsive to a phase dither reference signal. The clock signal is adjusted based on a phase control signal provided by the phase feedback control loop so as to generate a phase-adjusted clock. The phase-adjusted clock is supplied to a second stage modulator operable to blank out a suitable portion of each NRZ data bit interval and thereby create optical data having the RZ format.
REFERENCES:
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patent: 6204954 (2001-03-01), Nagarajan
patent: 6445478 (2002-09-01), Shimizu et al.
patent: 6718142 (2004-04-01), Murai
patent: 6744992 (2004-06-01), Bergano
Bello Agustin
Danamraj & Youst P.C.
Sewell V. Lawrence
Smith Jessica W.
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