Bidirectional fiber optic transmission systems and photodiodes for use in such systems
US4493113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1982 |
| Grant date | Jan 8, 1985 |
| Priority date | — |
| Expiry date | Sep 10, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4246
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A single-wavelength, bidirectional fiber optic transmission system is described in which at each terminal the output radiation of a light source (LED or semiconductor laser) is coupled through a small diameter hole in the active area of a photodiode into the core of a larger diameter transmission fiber. On the other hand, radiation propagating through the fiber in the opposite direction exits from the fiber with a large NA so that most of it is incident on the active area of the photodiode and little is lost through the hole. Also described are a number of photodiode configurations for use in such a system, as well as dual photodiodes to perform both signal detection and output monitoring functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.