Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1986-04-03
1988-06-07
Sikes, William L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
350 9615, 350 9629, 455610, 370 2, 356 731, G02B 628, H04B 900, G01N 2100, G02F 100
Patent
active
047492473
ABSTRACT:
The self-monitoring link utilizes a GRIN lens/blazed grating combination to multiplex an optical time domain reflectometry (OTDR) signal with data signals on a fiber optic communication link. An initial average OTDR reference signature for the OTDR signal on the link is determined and is compared with a continuously determined average OTDR signature. The reference signature and the continuously determined signature are compared and a warning or alarm signal is generated when the continuously determined signature differs from the reference signature by a preselectable limit. A microprocessor is provided to adjust the preselectable limit in response to the communication link operational parameters.
REFERENCES:
patent: 4468765 (1984-08-01), Hensel et al.
patent: 4522462 (1985-06-01), Large et al.
patent: 4571024 (1986-02-01), Husbands
Sikes William L.
The Mitre Corporation
Ullah Akm E.
LandOfFree
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