Coherent light generators – Optical fiber laser
Patent
1993-04-30
1994-03-22
Healy, Brian
Coherent light generators
Optical fiber laser
372 38, 372 70, 372 69, 372 43, 359333, 359341, 359345, 385 42, 385 31, 385 39, H01S 330, H01S 300, G02B 626
Patent
active
052971546
ABSTRACT:
Prior art fiber-optic amplifiers which are used in a fiber-optic link to amplify the light signals to be transmitted have the disadvantage that the semiconductor lasers employed as pump lasers are highly sensitive to feedback, so that the stability of the light-signal transmission is impaired by pump light reflected back into the pump lasers.
According to the invention, the operating current for such pump lasers (4) contains a noise current, so that the pump laser emits its pump light in many modes, which makes it insensitive to feedback.
To prevent the noise component of the pump light which is caused by the noise current from affecting the amplification of the light signals to be transmitted, the noise current is filtered in such a way that its spectral components have frequencies which lie above the reciprocal lifetime of that energy level of the active laser medium which causes the amplification of the light signals.
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"Compact and Highly Efficient Fiber Amplifier Modules Pumped by a 0.98-um Laser Diode"--Journal of Lightwave Technology, vol. 9, No. 2, Feb. 1991, pp. 291 to 295, by M. Shimizu et al.
"Trunk and Distribution Network Application of Erbium-Doped Fiber Amplifier"--Journal of Lightwave Technology, vol. 9, No. 2, Feb. 1991, pp. 198 to 208, by K. Nakagawa et al.
"Multichannel Crosstalk and Pump Noise Characterisation of ER.sup.3+ -Doped Fibre Amplifier Pumped at 980 nm" by R. I. Laming et al, Electronics Letters, Mar. 30, 1989, vol. 25, No. 7, pp. 455-456.
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Heidemann Rolf
Otterbach Jurgen
Alcatel SEL A.G.
Healy Brian
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