Bidirectional fiber optic systems
US4709413A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1985 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Jun 13, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4204
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A bidirectional fiber optic system is described in which at one 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 numerical aperture 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. Further described are fiber optic sensing systems for monitoring such variables as blood pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.