1.5 .mu.m wavelength asymmetric fabry-perot modulator with negat

Optical: systems and elements – Optical modulator – Light wave temporal modulation

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359248, 359260, 372 45, G02F 103

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active

054953600

ABSTRACT:
An asymmetric Fabry-Perot modulator (AFPM) is disclosed having an operating wavelength in the 1.5 .mu.m region used for long-haul optical transmission. The AFPM includes electro-absorption material consisting of an Al.sub.x In.sub.y Ga.sub.1-x-y As multiple quantum well structure. An amplitude modulated optical signal is produced by modulating the bias voltage across the electro-absorption material between zero bias and the matching voltage that gives zero reflectivity from the cavity formed by the electro-absorption material and top and bottom reflectors. An amplitude modulated optical signal having a negative chirp parameter is produced by coating the top of the modulator with a high-reflectivity coating to reduce the voltage required to achieve the matching condition and then modulating the electro-absorption material between the matching voltage and a higher voltage.

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A. H. Gnauck, et al, "Dispersion Penalty Reduction Using an Optical Modulator with Adjustable Chirp," IEEE Photonics Technology Letters, vol. 3, No. 10, Oct. 1991, pp. 916-918.
F. Devaux et al., "20 Gbit/s Operation of a High-Efficiency In GaAsP/InGaAsP MQ Electroabsorption Modulator with 1.2-V Drive Voltage", IEEE Photonics Technology Letters, vol. 5, No. 11, Nov. 1993, pp. 1288-1290.
L. Buydens et al., "High-Contrast/Low-Voltage Normally on InGa As/AlGaAs Asymmetric Fabry-Perot Modulator", IEEE Transactions Photonics Technology Letters, vol. 3, No. 12, Dec. 1991, pp. 1104-1106.
S. J. B. Yoo et al., "Quasi-CW Room-Temperature Operation of 1.55 .mu.m Vertical Cavity Surface Emitting Lasers Grown by OMCVD", IEEE Lasers & Electro-Optics Society 1992 Annual Meeting, Post Deadline Paper PD6, Nov. 1992.

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