Coherent receivers that are composed of a 90°optical hybrid and Photo Diodes(PD)are core components of coherent optical communication systems.Currently
the key to the development of coherent receivers is to realize their cost-effectiveness by improving their integration level.This paper
fabricates two types of 90°optical hybrids using a low-cost polymer Planar Lightwave Circuit(PLC)and integrates it with four back-illuminated III-V PD via a 45°reflecting mirror.Experimental results indicate that they both have good performances and high integration level.