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There is considerable interest in external modulators for optical fiber data transmission systems. In contrast to direct laser modulation, this should allow higher transmitter power injected into the fiber, provide signals that have a transform-limited optical spectrum under high-speed modulation, and produce a better on/off ratio. We have previously demonstrated a high-speed electroabsorption modulator made from multiple quantum wells(MQWs) of GaAs/AIGaAs.1 In this device, the light propagated perpendicular to the MQW layers, so there was less than 1 μm of optical interaction length. Nevertheless, this device demonstrated a 131 ps impulse response speed, with an on/off ratio of 1.7:1.2
© 1985 Optical Society of America
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