Photodiode
US6521968B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Aug 1, 2021 |
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.