Patent ID: 7136219
Filing Date: 2006-11-14
Classification: H01S,H04B

Abstract:
1. An optical amplifier comprising: an optical amplification medium doped with a rare-earth element; and a pumping light supply section that supplies a pumping light to said optical amplification medium, in which a population inversion state is formed by the pumping light supplied to said optical amplification medium and an amplified spontaneous emission light generated in said optical amplification medium, wherein said optical amplification medium comprises a delayed phase matching fiber comprising a first fiber to which a signal light and the pumping light are input through one end thereof and a second fiber whose energy density in a rare-earth doped optical amplification medium is relatively higher than that of said first fiber, such that the energy density of said first fiber and said second fiber is a function of a rare-earth element doping diameter and a mode field diameter of said first fiber and said second fiber, respectively.