Electro-optic intensity modulator with improved linearity

Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic

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385 41, G02B 610

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active

052300285

ABSTRACT:
The improved intensity modulator comprises a directional coupler with a single active coupling section with a fixed amount of coupling along with a single pair of electrodes for supplying a voltage-controlled mismatch in propagation constants. Two passively-biased coupling sections are connected in series with the active section, with the two passive sections combined being at least one coupling length long. The bias voltage of the two passive sections are independently varied to compensate for non-linearities by providing additional coupling. In an alternate embodiment, a voltage-controlled directional coupler is connected in series with a fixed Mach-Zehnder modulator and a fixed directional coupler, and linearity is obtained by varying the phase shift of the Mach-Zehnder modulator, the length of the fixed directional coupler, and the length and coupling coefficient of the active coupler.

REFERENCES:
patent: 5002353 (1991-03-01), Johnson
patent: 5011264 (1991-04-01), Bradley et al.
patent: 5015053 (1991-05-01), Johnson
"Waveguide Modulators with Extended Linear Dynamic Range-A Theoretical Prediction", Zong-Qi Lin and William S. C. Chang, IEEE Photonics Tech. Lett., vol. 2, No. 12, Dec. 1990.
"An Electrooptic Intensity Modulator with Improved Linearity", Farwell, et. al., IEEE Photonics Tech. Lett., vol. 3, No. 9, Sep. 1991.
"Intermodulation Distortion in a Directly Modulated Semiconductor Injection Laser"Lau, K. Y. et al., Appl. Phys. Lett 45(10), Nov. 15, 1984, pp. 1034-1036.
"In Search of a Linear Electrooptic Amplitude Modulator", Liu, Pao-Lo et. al., IEEE Photonics Tech. Lett., vol. 3, No. 2, Feb. 1991, pp. 144-146.

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