Patent ID: 8787721

Claim:
A device comprising: a photonic band gap optical fiber including a solid core made up of a rare earth-doped silica glass with a refraction index of n c , surrounded by an optical cladding including N pairs of silica layers around the core, in which N is a whole number greater than 2, each pair being made up of a first inner layer of silica, the first inner layer having a thickness d i , and a refraction index n i , the refraction index n i of the first inner layer being greater than the refraction index n c of the core, the first inner layer being covered by a second outer layer in contact with the first inner layer, the second outer layer being made of silica, the second outer layer having a thickness d e and a refraction index n e , the refraction index n e of the second outer layer being less than the refraction index n i of the first inner layer, the photonic band gap optical fiber configured to create signal propagation losses in order to attenuate signals within C and L bands which enables amplification of at least one signal within an S band over the entire length of the photonic band gap optical fiber.