2.5 Gb/s, 4 channel WDM transmission over 1060 km using EDFAs with suppressed gain bandwidth narrowing

M. Suyama; T. Terahara; S. Kinoshita; T. Chikama; M. Takahashi; M. Takahashi

doi:10.1364/OAA.1993.MB5

Optical Amplifiers and Their Applications
1993 OSA Technical Digest Series (Optica Publishing Group, 1993),
paper MB5
•https://doi.org/10.1364/OAA.1993.MB5

2.5 Gb/s, 4 channel WDM transmission over 1060 km using EDFAs with suppressed gain bandwidth narrowing

M. Suyama, T. Terahara, S. Kinoshita, T. Chikama, and M. Takahashi

Optical Amplifiers and Their Applications 1993

Yokohama Japan
ISBN: 1-55752-310-X

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M. Suyama, T. Terahara, S. Kinoshita, T. Chikama, and M. Takahashi, "2.5 Gb/s, 4 channel WDM transmission over 1060 km using EDFAs with suppressed gain bandwidth narrowing," in Optical Amplifiers and Their Applications, Vol. 14 of 1993 OSA Technical Digest Series (Optica Publishing Group, 1993), paper MB5.

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Abstract

Since the advent of erbium-doped fiber amplifier (EDFA)[1], upgrading transmission capacity by optical wavelength division multiplexing (WDM) has been drawing increasingly strong attention^[2,3]. Indispensable in WDM systems, EDFA has some problems to be solved. Among them, a major one is a gain bandwidth narrowing in a system with concatenated EDFAs, which results from non-uniform spectral gain profile of EDFA. To avoid this, equalization by adjusting transmitter powers has been proposed[^4]. In this paper, we show that gain bandwidth narrowing can be suppressed by properly choosing a saturation depth of EDFA. Furthermore, based on this result, we successfully confirmed 2.5 Gb/s, 4 channels WDM transmission over 1060 km using 18 EDFAs.

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