Abstract
Vertical coupling of light output from a stripe InGaAsP/InP laser amplifier to the bottom of the substrate for detection by means of a 45° mirror has been demonstrated. The composite-cavity amplifier structure is shown to have an inherent low facet reflectivity and unidirectional amplification property. With a fiber-to-detector gain of 15.4 dB and a nearly diffraction-limited output spot size, the device is suitable for compact integration with a photodetector as an optical pre-amplifier in a high bit-rate direct detection system.
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