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