BIMODAL INTRUSION DETECTION IN AN OPTICAL FIBER COMMUNICATION SYSTEM USING GRADED INDEX FIBER
Assignee
TRW INC., A CORP.OF OH
Filed
Jun 16, 1983
Granted
Mar 26, 1991
Location
Redondo Beach CA (TRW)
Abstract
An intrusion-alarmed optical communication system in which two separate modal groups are launched into a single graded index transmission fiber. The system includes two light sources and a lens to focus the light sources into the transmission fiber. A spatial filter is used to selectively limit the angles of incidence of the light on the fiber, and operates in conjunction with the lens to launch light from one source at appropriate angles and points of excitation to excite higher-order modes in the fiber, and to launch light from the other source at appropriate angles and points of excitation to excite lower-order modes in the fiber.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Nov 29, 1983
Rescinded
Mar 23, 1990
Duration
6 years, 3 months
Inventor
- 1CHARLES K. ASAWA
Sensitive facility: Redondo Beach CA (TRW)
Record Details
- Patent number
- US 5003623
- Application
- 06507423
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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