In {TAIL ~ this case}, a reverse bias voltage is applied across the device, and {HEAD ~ a device} acts as a modulator or a waveguide type PIN detector, due to quantum confinement Stark effect and the like 
In { TAIL ~ this case } , a reverse bias voltage is applied across the device , and { HEAD ~ a device } acts as a modulator or a waveguide type PIN detector , due to quantum confinement Stark effect and the like
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH