A high gain GRIN-SCH MQW optical semiconductor laser amplifier

A description is presented of the fabrication of a multiple-quantum-well GRIN-SCH traveling-wave-type amplifier combined with a tapered waveguide and a window region to reduce optical reflection at both end facets. Optical fiber-to-fiber gain of 10.4 dB (signal gain of 24.4 dB) under gain variation of <1.0 dB is demonstrated in the 1.55- mu m-wavelength region. The maximum fiber-to-fiber gain was 10.4 dB. The FWHM of gain bandwidth was >100 nm and gain variation was <1.0 dB. The saturation output power was 13.5 dBm. As multiple quantum-well amplifiers with high signal gain and high saturation output power, the devices show considerable promise as post-amplifiers capable of being integrated with other functional semiconductor devices.<
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