Patent ID: 7544975
Filing Date: 2009-06-09
Classification: H01L,Y02E

Abstract:
1. A photodiode for monitoring forward light of a wavelength λ emitted from a laser diode, comprising an InP substrate, an n-InP layer grown on the InP substrate, an InGaAs or an InGaAsP light receiving layer grown on the n-InP layer, an InP window layer grown on the light receiving layer, a p-region made in the InP window layer and the light receiving layer, and a high reflection film being composed of Al 2 O 3 /Si reciprocal layers and a SiON layer and being formed on the InP window layer or the InP substrate for reflecting 80%-90% of a 45 degree inclination incidence beam and allowing 20%-10% of the inclination beam to arrive at the InP layer or substrate.