Method and apparatus for bias and alignment control in an...

Details Method and apparatus for bias and alignment control in an... Method and apparatus for bias and alignment control in an...

2008-07-08

2008-07-08

Phan, Hanh (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S182000, C398S183000, C398S184000, C398S185000, C398S186000, C398S187000, C398S188000, C398S189000, C398S192000, C398S193000, C398S194000, C398S195000, C398S196000, C398S197000, C398S199000, C398S200000, C398S201000, C398S033000, C398S038000, C398S093000, C398S094000, C398S095000, C372S032000, C372S034000, C372S036000, C372S038060, C372S050121

Reexamination Certificate

active

07398023

ABSTRACT:
A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation format. Output power in dither signals applied to the bias signals may be detected by a low speed photodetector. One or more of the bias signals may be adjusted in a low speed control loop in response to an error signal obtained by mixing the detected signal with the low frequency dither signals.

REFERENCES:
patent: 6865348 (2005-03-01), Miyamoto et al.
patent: 6952534 (2005-10-01), Sikora
patent: 6972842 (2005-12-01), Doerr et al.
patent: 2003/0175037 (2003-09-01), Kimmitt et al.
Miyazaki, et al., “LiNbO3 Optical Intensity Modulator Packaged with Monitor Photdiode” IEEE Photonics Technology Letters, vol. 13, No. 5, May 2001.
International Search Report dated Sep. 14, 2006 received in corresponding International Patent Application Serial No. PCT/US05/45215 (8 pages).

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