System comprising Er-doped optical fiber

Details System comprising Er-doped optical fiber System comprising Er-doped optical fiber

1990-08-03

1991-10-22

Ullah, Akm

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

372 70, 307 4, 65 312, 359341, 385 27, 385 15, 385 24, G02B 628, H01S 3091, H04J 300, G02F 100

Patent

active

050589768

ABSTRACT:
The inventive optical fiber communication system comprises Si-based amplifier fiber whose core comprises Ge, Al, and Er. The amplifier fiber has an effective index difference (.DELTA.n) greater than 0.03, an effective core diameter a less than 3.5 .mu.m, a maximum Al concentration in the core of at least 6 mole %, a mode field diameter at the pump wavelength that is less than 5 .mu.m, a V-number at the pump wavelength in the range 1.4-2.0, a cut-off wavelength less than 1.4 .mu.m, and an Er distribution whose effective diameter is less than that of the Ge distribution. The fiber has advantageous properties including low amplification threshold and noise. Disclosed is also a method of making optical fiber that can be used to produce fiber having characteristics (e.g., .DELTA.n>0.03, high Al concentration) not generally obtainable with prior art methods. In a particular embodiment the method comprises a partial collapse of a tubular preform prior to completion of core material deposition, completion of core material deposition, and final collapse.

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patent: 4922481 (1990-05-01), Hicks
patent: 4923279 (1990-05-01), Ainslie et al.
"Review of Rare Earth Doped Fibre Lasers and Amplifiers", by P. Urquhart, IEE Proceedings, vol. 135, (Pt. J., No. 6), pp. 385-407, Dec. 1988.
"Erbium-Doped Fibers: Tomorrow's Repeaters", by E. Desurvire, Lasers and Optronics, May 1990, pp. 55-63.
"Three-Level Fiber Laser Amplifier: A Theoretical Model", by J. R. Armitage, Applied Optics, vol. 27, No. 23, Dec. 1988, pp. 4831-4836.
"Efficient, High Power, High Gain, Er.sup.3+ Doped Silica Fibre Amplifier", by F. F. Massicott, Electronics Letters, vol. 26, No. 14, Jul. 1990.
"FA8 Gain Characteristics of Er.sup.3+ Doped Fiber With Quasiconfined Structure", by N. Kagi, Program of the Optical Fiber Communication Conference, San Francisco, Jan. 22-26, 1990, 1990 Technical Digest Series, vol. 1, Conference Edition, Paper FA8.

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