Light receiving element unit
AssigneeKyoto Semiconductor Co., Ltd.
InventorsYu Itazaki, Etsuji Omura
Life of this patent
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Abstract
An edge incident type light receiving element unit capable of receiving optical signals in different wavelength ranges incident from the edge side comprises a first light receiving element for receiving optical signals in a first wavelength range and a second light receiving element for receiving optical signals in a second wavelength range, and configured so that optical signals transmitted through a first light receiving portion formed vertically on a wall portion of a first semiconductor substrate incident via a reflecting portion on a second light receiving portion formed on a second semiconductor substrate fitted on the first semiconductor substrate.
Claims4
A light receiving element unit comprising a first light receiving element having a first light receiving photodiode for receiving optical signals in a first wavelength range and a second light receiving element having a second light receiving photodiode for receiving optical signals in a second wavelength range, and configured so that optical signals transmitted through the first light receiving photodiode are incident on the second light receiving photodiode;
- wherein
- the first light receiving element comprises a first semiconductor substrate, a wall portion erected integrally with the first semiconductor substrate, and the first light receiving photodiode formed on the wall portion,
- the second light receiving element is an edge incident type light receiving element comprising a second semiconductor substrate, the second light receiving photodiode formed on a main surface side of the second semiconductor substrate, a reflecting portion that reflects optical signals incident from an edge surface of the second semiconductor substrate toward the second light receiving photodiode, and
- the second light receiving element is arranged so that the edge surface faces the wall portion.
Dependencies are inferred from the claim text.