Accession Number : ADP007021
Title : A High Power and Low Noise Transmitter AM-VSB Transmission Using Erbium-Doped Fiber Post Amplifier,
Corporate Author : SUMITOMO ELECTRIC INDUSTRIES LTD YOKOHAMA (JAPAN)
Personal Author(s) : Shigematsu, Masayuki ; Nishimura, Masayuki ; Okita, Toshio ; Iizuka, Kazuo
Report Date : 22 MAY 1992
Pagination or Media Count : 4
Abstract : Erbium doped fiber amplifiers(EDFAs) with high output power and no distortion degradation are very useful for the amplitude-modulated vestigial-sideband(AM-VSB) transmission systems which require a relatively high received power for a preferred carrier to noise ratio(CNR) and a low distortion (1) (2). A field trial was conducted and feasibility of multi-distribution for trunk lines was confirmed(3). We have developed an erbium doped fiber with a high conversion efficiency of 86 % and a small wavelength dependence. In this paper, by using this fiber as a post amplifier, we present a high power and low noise transmitter with monitoring functions for practical use. We also show the effectiveness of long-wavelength-pass filters which have a low insertion loss and no need for wavelength tuning unlike band-pass filters.
Descriptors : *AMPLIFIERS, *TRANSMITTERS, AMPLITUDE, CONVERSION, DEGRADATION, DISTORTION, DISTRIBUTION, ERBIUM, FIBERS, FILTERS, FUNCTIONS, HIGH POWER, INSERTION LOSS, LONG WAVELENGTHS, LOW NOISE, MONITORING, NOISE, OUTPUT, TUNING, DIODES.
Subject Categories : Electrical and Electronic Equipment
Fiber Optics and Integrated Optics
Distribution Statement : APPROVED FOR PUBLIC RELEASE