Patent · US Expired

Photodiode

US6696740B2 · kind B2 · utility

2Cited by

8References

3Claims

0Family size

Assignee

Sumitomo Electric Industries, Ltd. · JP

Inventors

Yoshiki Kuhara · Osaka, JP
Yasuhiro Iguchi · Itami, JP

Key dates

Filing date	Dec 6, 2002
Grant date	Feb 24, 2004
Priority date	—
Expiry date	Dec 6, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH01L2924/3025
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A photodiode that is used in an optical communication system using two different wavelengths, &lgr;1 and &lgr;2 (&lgr;1<&lgr;2), and that enables a reduction in the optical crosstalk caused by outgoing light having a longer wavelengths, &lgr;2. A photodiode that receives light having a shorter wavelengths, &lgr;1, is provided with an absorption layer made of a material having a bandgap wavelength, &lgr;g. (&lgr;1<&lgr;g<&lgr;2), to detect the light having &lgr;1. A filter layer that absorbs unwanted light having &lgr;2 is provided over the absorption layer so that the light having &lgr;2 cannot return to the absorption layer after passing through it once.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.