Patent ID: 6570701
Filing Date: 2003-05-27
Classification: H04B

Abstract:
A long-band (L-band) light source for testing optical elements in a fiber amplifier including (a) a rare earth doped fiber as an amplification medium, (b) forward and backward pump laser diodes, positioned on front and rear ends of the rare earth doped fiber, for generating and providing pumping lights to the rare earth doped fiber, (c) first wavelength selective couplers for providing the pumping lights from the forward and backward pump laser diodes to the rare earth doped fiber, and (d) optical isolators, inserted between front and rear ends of the first wavelength selective couplers, respectively, for intercepting backward lights reflected from input and output terminals of the fiber amplifier, the L-band light source comprising:a feedback loop for making a seed beam incident to the rare earth doped fiber or making an amplified spontaneous emission (ASE) incident again to the rare earth doped fiber to reuse the seed beam or the ASE as the L-band light source for testing the optical elements; second wavelength selective couplers, provided between the optical isolators and the first wavelength selective couplers, respectively, for making the seed beam incident to the feedback loop or extracting and providing the ASE to the feedback loop; and a forward optical isolator connected between the second wavelength selective couplers and being disposed in the feedback loop, for intercepting a backward propagation of the seed beam or the ASE.