Abstract
For high bit rate long haul optical fiber transmission systems, there is considerable interest in external modulators that can reduce wavelength chirping. The wave- guided MQW optical modulators provide a large absorption coefficient change under a relatively low applied voltage.1 Recently, we reported high speed MQW modulators with bandwidths in excess of 20 GHz.2 A higher bandwidth—over 40 GHz—has been demonstrated with a high on/off ratio of over 20 dB and a drive voltage of 7 V utilizing the improved waveguide structure.
© 1990 Optical Society of America
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