Optical phase modulator with monitoring structure

Details Optical phase modulator with monitoring structure Optical phase modulator with monitoring structure

2008-10-14

2011-11-01

Vanderpuye, Ken (Department: 2613)

Optical communications

Diagnostic testing

Test signal

Reexamination Certificate

active

08050555

ABSTRACT:
The invention relates to an optical waveguide device that includes a waveguide phase modulator (WPM). A waveguide monitoring structure is coupled optically in parallel with the WPM so as to form a Mach-Zehnder interferometer therewith for producing monitor light indicative of a phase shift imparted by the WPM. The waveguide monitoring structure includes a first optical tap for tapping off a fraction of light entering the first WPM for providing first tapped-off light, a second optical tap for tapping off a fraction of light exiting the first WPM for providing second tapped off light, and an ancillary phase modulator for modulating the optical phase of the first or second tapped-off light so as to modulate the intensity of the monitor light in dependence upon the first phase shift. A feedback circuit controls the phase shift imparted by the WPM based on a modulation index of the monitor light.

REFERENCES:
patent: 6181429 (2001-01-01), Barberis et al.
patent: 7197251 (2007-03-01), Choudhary et al.
patent: 7389055 (2008-06-01), Rickard et al.
patent: 2004/0081470 (2004-04-01), Griffin
patent: 2004/0141222 (2004-07-01), Miyazaki et al.
patent: 2006/0133713 (2006-06-01), Yamada et al.
patent: 2007/0264028 (2007-11-01), Yuki et al.

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