Broadband light source using seed-beam

Abstract

Disclosed is a broadband light source for measurement using a seed-beam which can reduce the strength difference between the output lights per wavelength by heightening the strength of the output light corresponding to the L-band of the light source, and thus reduce the measurement error per wavelength. The broadband light source includes a seed-beam light source for outputting a seed-beam of a predetermined band of wavelength, a first optical coupler for combining the seed-beam and a pumping light and making a combined light incident to a front of a rare earth ion-doped optical fiber, a first pumping light source for providing the pumping light to the first optical coupler, a second optical coupler for making the input pumping light incident to a rear of the rare earth ion-doped optical fiber, a second pumping light source for providing the pumping light to the second optical coupler, and an output terminal for radiating the light outputted through the rear of the rare earth ion-doped optical fiber.