Optical communications – Transmitter and receiver system – Including compensation
Reexamination Certificate
2006-10-19
2011-10-18
Liu, Li (Department: 2613)
Optical communications
Transmitter and receiver system
Including compensation
C398S188000, C398S192000, C398S195000, C398S198000, C398S208000, C398S209000, C398S213000
Reexamination Certificate
active
08041228
ABSTRACT:
A transmitter (3) for generating a DQPSK-modulated optical signal, including: a splitter (7) for dividing an optical carrier signal into a first and second branch (8a,8b), a first and second Mach-Zehnder interferometer (9, 10) in the first and second branch (8a,8b), respectively, a phase shifter (11) in one of the branches (8b) generating a nominal phase shift of .pi./2, and a combiner (7′) for combining the optical output signals of the two branches (8a,8b). The transmitter (3) has a feedback circuit (12) generating at least a first and second bias signal (15.1to15.3) for adjusting a bias of at least the first and second Mach-Zehnder interferometers (9, 10), the feedback circuit (12) includes a detector for generating at least a first and second feedback signal from a sample signal extracted from the optical signal after the combiner (7′), and for each bias signal: a local oscillator generating an auxiliary signal modulating the bias signal (15.1to15.3) at a pre-defined frequency (f1, f2, f3), a lock-in detector determining a phase difference between the feedback signal and the auxiliary signal, and a bias circuit for generating the bias signal (15.1to15.3) from an output signal of the lock-in detector, wherein the pre-defined frequencies of the auxiliary signals (f1, f2, f3) are different from one another (f1.noteq.f2.noteq.f3) and preferably no integer multiples of each other.
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Charlet Gabriel
Fauconnier Thibaut
Alcatel Lucent
Carmen Patti Law Group, LLC
Liu Li
LandOfFree
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