Optical modulating apparatus having bias controller and bias...

Details Optical modulating apparatus having bias controller and bias... Optical modulating apparatus having bias controller and bias...

2006-04-04

2006-04-04

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

Reexamination Certificate

active

07023534

ABSTRACT:
Disclosed are an optical modulating apparatus having a bias controller and a bias control method using the same, which can automatically perform a bias adjust so as to keep the optical output characteristic of an optical modulator constant. The optical modulating apparatus includes an optical modulator to modulate an optical carrier using a bias signal; and a bias controller to adjust the bias signal of the optical modulator by detecting a second harmonic signal of the modulated optical signal, setting a minimum point of the second harmonic signal as a reference bias voltage, and then comparing a magnitude of the second harmonic signal that changes according to an external environment with a magnitude of a signal generated from the reference bias voltage.

REFERENCES:
patent: 5060310 (1991-10-01), Frisch et al.
patent: 5424680 (1995-06-01), Nazarathy et al.
patent: 5734469 (1998-03-01), Strandjord
patent: 6046810 (2000-04-01), Sanders et al.

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