Figure 1. A schematic of an OPAD building block and a functional equivalent featuring a semicondutor optical amplifier, a passband filter and a PIN photodetector. Inset: a scanning electron micrograph of a tapered activepassive waveguide transition area of the OPAD chip.
AbstractAn integrated optically pre-amplified photodetector, featuring waveguide gain and absorption sections defined on the same active waveguide layers atop a common passive waveguide, is reported. The device demonstrates high responsivity while exhibiting little polarization sensitivity