Optical amplifier with bent, single-mode active fiber

Details Optical amplifier with bent, single-mode active fiber Optical amplifier with bent, single-mode active fiber

1991-01-16

1992-11-03

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Optical fiber

359345, 372 6, H01S 330, G02B 610

Patent

active

051610507

ABSTRACT:
An optical amplifier, particularly useful for optical fiber telecommunication lines, which includes an active fiber doped with a fluorescent dopant which provides light energy emission at the wavelength of the transmission signals when the latter signals are applied thereto. One section of telecommunication line is connected to one input of a dichroic coupler, the output of which is connected to one end of the active fiber and the other input of which is connected to a source of pumping energy at a wavelength lower than that of the transmission signals. The other end of the active fiber is connected to another section of the telecommunication line. In rectilinear form, the active fiber provides single-mode propagation of the energy at the signal wavelength and multi-mode propagation of energy at the pumping energy wavelength. However, the active fiber is bent to a radius of curvature for at least 70% of its length which will provide only fundamental mode propagation at the pumping energy wavelength which also reduces the mode diameter for the transmission signals.

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patent: 4923279 (1990-05-01), Ainslie et al.

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