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Proceedings Paper

Erbium-Doped Fiber Amplifier And Its Application To Nonlinear Optics
Author(s): Masataka Nakazawa; Yasuo Kimura; Kazunori Suzuki; Hirokazu Kubota
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Paper Abstract

Gain characteristics of an Er3+-doped fiber for high-power picosecond input pulses are studied with an InGaAsP laser diode pump source at 1.46-1.48 μm. The output energy and peak power of the amplified pulses reach as high as 7.9 pJ and 792 mW for a repetition rate of 100 MHz and a pulse width of 10 ps. The gain saturation is so slow that the gain in high speed pulse transmission systems is determined by a steady-state saturated gain. With the Er3±-doped fiber amplifier, it is shown that solitons can be amplified and transmitted over a long dispersion-shifted fiber by using the dynamic range of an N=1 soliton. Furthermore, optical solitons at wavelengths of 1.535 μm and 1.552 jim have been amplified and transmitted simultaneously over 30 km with an Er3±-doped fiber repeater for the first time. The collision experiments between these different wavelength solitons are described. It is shown that there is a saturation-induced cross talk between multi channel solitons, and the cross talk (the gain decrease) is determined by the average input power in high bit-rate transmission systems. Subpicosecond soliton and 20 GHz soliton pulse amplifications with Er3±-doped fiber are also described, which indicate that Er fibers are very advantageous for short pulse soliton communication. Finally, a gain coefficient as high as 2.4 dB/mW is reported using InGaAsP laser diodes.

Paper Details

Date Published: 15 February 1990
PDF: 18 pages
Proc. SPIE 1171, Fiber Laser Sources and Amplifiers, (15 February 1990);
Show Author Affiliations
Masataka Nakazawa, NTT Transmission Systems Laboratories (Japan)
Yasuo Kimura, NTT Transmission Systems Laboratories (Japan)
Kazunori Suzuki, NTT Transmission Systems Laboratories (Japan)
Hirokazu Kubota, NTT Transmission System Laboratories (Japan)

Published in SPIE Proceedings Vol. 1171:
Fiber Laser Sources and Amplifiers
Michel J. F. Digonnet, Editor(s)

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