Bias stabilization circuit and method for a linearized direction

Details Bias stabilization circuit and method for a linearized direction Bias stabilization circuit and method for a linearized direction

1995-06-06

1996-07-02

Lee, John D.

Optical: systems and elements

Optical frequency converter

Harmonic generator

359332, 385 9, 385 40, 385122, G02F 135, G02F 200

Patent

active

055328679

ABSTRACT:
A circuit and method for actively stabilizing the DC bias voltages applied to passive sections of a linearized directional coupler modulator. A reference electrical signal is applied to the active section of a linearized directional coupler modulator, thereby modulating an input optical beam. An optical detector is used at the output end of the modulator to monitor the modulated optical beam. The output of the detector is sent to one or more synchronous detectors that select the one or more harmonic frequency components that one wants to suppress. The synchronous detector output is sent to a filter that converts the harmonic frequency component to a DC bias voltage, which is integrated and used to bias the passive section of the modulator. The resulting negative-feedback loop minimizes the magnitude of the particular harmonic that is selected by the filter. In a preferred embodiment, the present stabilization circuit is used to stabilize the bias voltages in a three-section linearized directional coupler modulator, resulting in a stable modulator with low second harmonic distortion and low third-order intermodulation distortion.

REFERENCES:
patent: 5161044 (1992-11-01), Nazarathy et al.
patent: 5168534 (1992-12-01), McBrien et al.
patent: 5309532 (1994-05-01), Chang et al.
patent: 5369522 (1994-11-01), Tangonan et al.
R. V. Schmidt, "Integrated Optics Switches and Modulators", Integrated Optics: Physics and Applications, ed. S. Martelluci and A. N. Chester (New York: Plenum Press, 1981), [No Month] pp. 181-210.
Juan F. Lam and Gregory L. Tangonan, "A Novel Optical Modulator System with Enhanced Linearization Properties", IEEE Photon. Tech. Lett., vol. 3, No. 12 (Dec. 1991), pp. 1, 102-1, 104.

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