Systems and methods for DQPSK modulator control using...

Details Systems and methods for DQPSK modulator control using... Systems and methods for DQPSK modulator control using...

2007-11-01

2010-06-08

Mis, David (Department: 2817)

Modulators

Phase shift keying modulator or quadrature amplitude modulator

C359S239000, C359S279000, C398S198000

Reexamination Certificate

active

07733193

ABSTRACT:
DQPSK modulator control is provided using a single monitor photodiode with a selectively injected dither tone. The dither tone signal is sequentially injected into arm modulators and/or to a modulator driver port in time slots. A tapped signal at the output of the modulator is monitored synchronously with injected dither (I arm, Q arm, or phase modulator in third slot). The recovered dither output from a single photodiode is processed in the same sequence as the dither injection to adjust the bias to the optimal point: I-arm at the null point, Q-arm at the null point, and phase modulator at the quadrature point. This technique can be used for any control where the rate of change of the monitored condition due to systemic or environmental conditions (e.g., temperature, aging, etc.) is slow enough to allow time slot dither injection, monitor, and control.

REFERENCES:
patent: 2004/0005154 (2004-01-01), MacDonald

Affiliated with

Also associated with

Rating

Systems and methods for DQPSK modulator control using... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Systems and methods for DQPSK modulator control using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systems and methods for DQPSK modulator control using... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4170754