Title :
Erbium-doped fiber amplifier for video distribution networks
Author :
Yoneda, Etsugo ; Kikushima, Koji ; Tsuchiya, Toshiyuki ; Suto, Ko-ichi
Author_Institution :
NTT Corp., Kanagawa, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
The possibility of an application of Er-doped fiber amplifiers to AM-FDM (frequency division multiplexing) or FM-FDM video distribution networks is discussed. The measured noise and modulation distortion properties of ER-doped fiber amplifiers are good enough to meet even the severe quality standards set for trunk lines. A carrier-to-noise ratio (CNR) of 57 dB for an AM-FDM transmission was measured. A second-order harmonic distortion (HD2) of less than -56 dB was measured by the monotone method (modulation depth m=50%), and a cross modulation distortion (XM) of less than -63 dB was measured by the two-tone method (m=25%×channel). On the basis of these values, composite second-order distortion (CSO) and XM in a 40-channel transmission were estimated as less than -57 dB and -73 dB, respectively. Significant reduction of noise and modulation distortion is made possible by optimizing the length of Er-doped fiber amplifiers and using input- and output-port isolators
Keywords :
amplitude modulation; cable television; erbium; fibre lasers; frequency division multiplexing; frequency modulation; optical communication equipment; video amplifiers; video signals; 57 dB; AM-FDM; CNR; FM-FDM; SiO2:Er; carrier-to-noise ratio; cross modulation distortion; fiber amplifier; frequency division multiplexing; input port isolators; modulation depth; monotone method; output port isolators; second-order harmonic distortion; trunk lines; two-tone method; video distribution networks; Distortion measurement; Erbium-doped fiber amplifier; Frequency division multiplexing; Frequency modulation; Harmonic distortion; Optical distortion; Optical losses; Optical receivers; Stimulated emission; TV receivers;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
