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Developments in fiber optics for distribution automationAn optical fiber based communications system of unusual design is described. The system consists of a network of optical fibers overlaid on the distribution system. It is configured as a large number of interconnected rings, with some spurs. Protocols for access to and control of the network are described. Because of the way they function, the protocols are collectively called AbNET, in commemoration of the microbiologists' abbreviation Ab for antibody. Optical data links that could be optically powered are described. There are two versions, each of which has a good frequency response and minimal filtering requirements. In one, a conventional FM pulse train is used at the transmitter, and a novel form of phase-locked loop is used as demodulator. In the other, the FM transmitter is replaced with a pulse generator arranged so that the period between pulses represents the modulating signal. Transmitter and receiver designs, including temperature compensation methods, are presented. Experimental results are given.
Document ID
19920020436
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kirkham, H. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Friend, H. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Jackson, S. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Johnston, A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1991
Subject Category
Optics
Report/Patent Number
JPL-PUBL-90-2
NAS 1.26:190454
NASA-CR-190454
Accession Number
92N29679
Funding Number(s)
CONTRACT_GRANT: DE-AI01-79ET-29372
CONTRACT_GRANT: NAS7-918
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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