Patent ID: 7372123

Claim:
A semiconductor light-receiving module comprising: a semiconductor light-receiving element; and an incident light direction device; wherein the semiconductor light-receiving element comprises: a substrate; at least a light absorbing layer and an upper cladding layer formed sequentially on the substrate; a light incident facet including at least one facet of the substrate and the light absorbing layer; and electrodes which output an electric signal generated by absorption of light entering from the light incident facet in the light absorbing layer; wherein the incident light direction device positions the semiconductor light-receiving element such that the light is irradiated obliquely onto the light incident facet, and such that at least one part of the light is irradiated to the light absorbing layer at the light incident facet; wherein the incident light direction device positions the semiconductor light-receiving element such that an effective index of the light is higher than a refractive index of the upper cladding layer; and wherein the semiconductor light-receiving element propagates, of the light entering the light absorbing layer, at least one of a component propagating parallel to an interface of the light absorbing layer with the upper cladding layer positioned above the light absorbing layer, and a component propagating in an oblique direction in the light absorbing layer by being reflected at the interface.