Abstract

Waveform deterioration due to frequency chirping in a modulated light source limits the maximum transmission distance in multigigabit optical transmission systems. Semiconductor MWQ external modulators are expected to overcome the problems, because of their potential for low chirp and high-speed modulation and for optoelectronic integration.1,2 The Mach-Zehnder type (MZ) modulator has been proposed as one of the most promising, since it achieves zero or negative chirping which maximizes the transmission distance.3 Recently, a highly efficient and small size MQW MZ modulator was reported,4 but its driving voltage was still too high (~10 V with only ~7 dB of extinction ratio) for practical use. Here, we demonstrate a low driving voltage InGaAs/InALAs MQW MZ modulator with high extinction ratio (>15 dB), for 10-Gbit/s long-haul transmission systems operating in the 1.55-μm) wavelength region.

© 1992 Optical Society of America

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References

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