Erbium-doped fiber amplifier

Details Erbium-doped fiber amplifier Erbium-doped fiber amplifier

1989-11-27

1991-04-02

Gonzalez, Frank

Coherent light generators

Optical fiber laser

372 40, 372 71, 350 963, 350 9634, 330 43, G02B 600, H01S 300

Patent

active

050051750

ABSTRACT:
This invention is a rare earth doped optical amplifier with increased gain and lowered pump thresholds. The amplifying scheme is based on a 3 level lasing system rather than the more prevalent 4 level lasing system. Additionally, the transmission mode of the optical fiber at the pump wavelength has a radius which is substantially equal to or greater than the radius of the distribution profile of the rare earth ions in the fiber amplifier core. With the inventive amplifier, a gain of 37 dB and a saturation power of 11.3 dBm has been obtained with only 54 mW of launch power at .lambda.=1.49 .mu.m.

REFERENCES:
patent: 4780877 (1988-10-01), Snitzer
patent: 4860295 (1989-08-01), Byer et al.
Desurvire et al., Opt. Lett. 12(11), Nov. 1987, "High-Gain Erbium-Doped Traveling-Wave Fiber . . . ", pp. 888-890.
Miller et al., Electron. Lett., 23(16), Jul. 30, 1987, "Low-Threshold CW Operation of an Erbium-Doped . . . ", pp. 865-866.
Mears et al., Electron. Lett., 22(3), 30 Jan. 1986, "Low-Threshold Tunable CW and Q-Switched . . . ", pp. 159-160.
Electronics Letters, 5th Jan. 1989, vol. 25, No. 1, Laming et al., "Efficient Pump Wavelengths of . . . ", pp. 12-14.

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