Fiber optic amplifier

Details Fiber optic amplifier Fiber optic amplifier

H - Electricity

01

S

345/12

H01S 3/091 (2006.01) H01S 3/094 (2006.01)

Patent

CA 1210486

FIBER OPTIC AMPLIFIER Abstract of the Disclosure A pair of small diameter optical fibers are arranged in a side-by-side configuration, the first fiber providing a passive guide for pump light, and the second fiber formed of a material, such as Nd:YAG which has amplifying properties at the signal frequency. The signal to be amplified propagates through the second fiber resulting in amplification of the signal. The first fiber is pumped from one or both ends, utilizing a cone shaped rod which is optically coupled thereto. A plurality of pump light sources are mounted on the end face of the rod to introduce collimated pump light into the large end of the cone shaped rod. Total internal reflections on the cone walls compress the pump light to a small, fiber-size diameter end for propagation through the pump fiber and absorption by the active fiber. The pump light sources are offset from the axis of the rod to excite high order modes in the pump fiber to enhance absorption by the active fiber. The pump light sources preferably comprise high power laser diodes and collimating microlenses. By utilizing the cone-shaped rod to couple light from the high power laser diodes to the pump fiber, high pump power densities can be achieved, yielding increased amplification.

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