High-output and low-noise optical fiber amplifier

Details High-output and low-noise optical fiber amplifier High-output and low-noise optical fiber amplifier

1997-11-14

2000-02-22

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359134, H04J 1402, H01S 300

Patent

active

060286989

ABSTRACT:
An optical fiber amplifier can maintain its optical power output above a level exceeding +20 dBm and a low noise figure if the input optical signal shows a high power level. It comprises a front stage amplifying optical fiber 11 doped with a rare-earth element and arranged in a front stage 10A thereof and a back stage amplifying optical fiber 12 also doped with a rare-earth element and arranged in a back stage 10B thereof, wherein the front stage amplifying optical fiber 11 is provided at the signal light input terminal 13 thereof with a first optical coupler 14 for coupling signal light and excitation light in a same direction and at the signal light output terminal 15 thereof with a second optical coupler 16 for coupling signal light and excitation light in opposite directions and the back stage amplifying optical fiber 12 is provided at the signal light input terminal 19 thereof with a third optical coupler 21 for coupling signal light and excitation light in opposite directions, the first, second and third optical couplers 14, 16 and 21 being connected respectively to a first excitation light source 17 for generating excitation light with the 1,480 nm wavelength, a second excitation light source 18 for generating excitation light with the 980 nm wavelength and a third excitation light source 22 for generating excitation light with the 1,480 nm wavelength.

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Auge, J. et al, "Repeaterless Transmission With 62.9 dB Power Budget Using A Highly Efficient Erbium-Doped Fiber Amplifier Module", Lecture No. TuC3 Bulletin, Topical Meeting on Optical Amplifiers, Optical Society of America, Aug. 1990, pp. 156-159.
Way, W.I. et al, "Noise Figure of a Gain-Saturated Erbium-Doped Fiber Amplifier Pumped at 980 nm", Lecture No. TuB3 Bulletin, Topical Meeting on Optical Amplifiers, Optical Society of America, Aug. 1990, pp. 134-137.
Laming, R.I. et al, "Saturated Erbium-Doped Fibre Amplifiers", Lecture No. MB3 Bulletin, Topical Meeting on Optical Amplifiers, Optical Society of America, Aug. 1990, pp. 16-19.
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