Bimodal intrusion detection in an optical fiber communication sy

Details Bimodal intrusion detection in an optical fiber communication sy Bimodal intrusion detection in an optical fiber communication sy

1983-06-16

1991-03-26

Moskowitz, Nelson

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

350 9615, 455602, H04B 900, G02B 514, G02B 5172

Patent

active

050036238

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.

REFERENCES:
patent: 4070091 (1978-01-01), Taylor et al.
patent: 4217488 (1980-08-01), Hubbard
patent: 4237550 (1980-12-01), Steensma
patent: 4381137 (1983-04-01), Berg et al.
patent: 4436368 (1984-03-01), Kech

Affiliated with

Also associated with

Rating

Bimodal intrusion detection in an optical fiber communication sy does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Bimodal intrusion detection in an optical fiber communication sy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bimodal intrusion detection in an optical fiber communication sy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-623867