Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Patent
1992-09-02
1994-01-11
Gonzalez, Frank
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
385 1, 385 2, 385 8, G02B 610
Patent
active
052789233
ABSTRACT:
An optical modulation system having cascade-coupled electro-optic modulator stages in either dual tandem or split tandem configurations. An electrical splitter derives multiple electrical drives for the multiple stages from a single modulating input signal. The multiple drive signals are linearly related in magnitude and preferably induce simultaneous antiphase (180.degree. out-of-phase) optical modulation in the tandem stages. While a double Mach-Zehnder cascade configuration could be used, at least one modulator stage might instead be a balanced-bridge interfometer-type modulator having at least one directional coupler. At least one directional coupler in such a configuration may be a .DELTA..beta. coupler. Application of bias voltages to the interferometer sections and to coupler sections by means of a parametric feedback loop is done in order to simultaneously enhance the linear modulation coefficient, minimize odd order distortions and null the even order distortions that are associated with biased .DELTA..beta. couplers.
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Halvor Skeie and Richard V. Johnson, "Linearization of electrooptic modulators by a cascade coupling of phase modulating electrodes", SPIE Proceedings, vol. 1583, Integrated Optical Circuits, Sep. 3-4, 1991, Boston, Mass., pp. 153-164.
J. F. Lam and G. L. Tangonan, "A novel optical modulator system with enhanced linearization properties", IEEE Transactions, Photonics Technology Letters, vol. 3, No. 12, pp. 1102-1104 Dec. 1991.
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Kagan Yishai
Nazarathy Moshe
Simler Yaron
Barns Stephen W.
Gonzalez Frank
Harmonic Lightwaves, Inc.
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