Abstract

External optical modulators using quantum wells in the active layer have received much attention,^1,2 as an alternative to injection current modulation of laser sources. Although they have been demonstrated at up to 20 GHz,¹ they often have high insertion loss and/or low modulation depth. To produce high optical modulation depth at high frequency with low electrical power, we have fabricated a waveguide modulator using asymmetric coupled quantum wells (ACQWs) in the optically guiding layer.

© 1990 Optical Society of America