Optical fiber amplifier

Details Optical fiber amplifier Optical fiber amplifier

1996-11-20

1998-04-21

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359134, G02B 628

Patent

active

057424276

ABSTRACT:
This invention relates to an optical fiber amplifier for amplifying and outputting input signal light. The optical fiber amplifier includes first to third amplification optical fibers. The first to third optical fibers are arranged such that the signal light passes through the first to third optical fibers in the order named. A first value as the (emission cross-section)/(absorption cross-section) of the first optical fiber and a third value as the (emission cross-section)/(absorption cross-section) of the third optical fiber are set to be larger than a second value as the (emission cross-section)/(absorption cross-section) of the second optical fiber. With this arrangement, low noise can be achieved in the first optical fiber, and a large output can be achieved in the third optical fiber. In addition, the gain characteristics associated with wavelength in this optical fiber amplifier as the overall transmission line including the first, second, and third amplification optical fibers can be sufficiently flattened.

REFERENCES:
patent: 5050949 (1991-09-01), DiGiovanni et al.
patent: 5623362 (1997-04-01), Mitsuda et al.
patent: 5640269 (1997-06-01), Shigematsu et al.
patent: 5664131 (1997-09-01), Sugiya
Kashiwada et al, "Gain-Flattened Optical-Fiber Amplifiers With a Hybrid Er-Doped-Fiber Configuration for WDM Transmission", OFC '95 Technical Digest, pp. 77 and 78.
Nakazato et al, "Four Channel 2.5Gbit/s WDM Transmission Over 509km Using Gain-Flattened Hybrid In-Line EDFAs", Proc. 21st Eur. Conf. on Opt. Comm. (ECOC'95-Brussels), pp. 925-928.
Mitsuda et al, "Output-Power and Noise Figure Characteristics of 0.98 .mu.m/1.48 .mu.m Hybrid Pumped Erbium-Doped Fiber Amplifier", Technical Report of IEICE. EMD 93-34, CMP 93-47, OQE 93-68 (1993-08), pp. 1-6.
Chen, "Measuring Emission Cross-Section Profile of Erbium-Doped Fibre With low Input Power", Electronics Letters, May 26, 1994, vol. 30, No. 11, pp. 889-891.

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