Patent ID: 8107783

Claim:
A stretcher fiber for use in an all-fiber stretcher module, comprising: a core region having a radius r l , a refractive index n 1 , and a positive effective refractive index Δn 1 with respect to an outer cladding region having an outer radius r 0 and a refractive index n 0 , where Δn 1 is equal to n 1 −n 0 , an inner trench region surrounding the core region, the inner trench region having an outer radius r 2 , a refractive index n 2 less than n 0 , and a negative effective refractive index Δn 2 equal to n 2 −n 0 , a ring region surrounding the inner trench region, the ring region having an outer radius r 3 , a refractive index n 3 greater than n 0 , and a positive effective refractive index Δn 3 equal to n 3 −n 0 , an outer trench region surrounding the ring region, the outer trench region having an outer radius r 4 , a refractive index n 4 less than n 0 , and a negative effective refractive index Δn 4 equal to n 4 −n 0 , the outer cladding region surrounding the outer trench region, the values of r 0 , r 1 , r 2 , r 3 , r 4 , Δn 1 , Δn 2 , Δn 3 , and Δn 4 causing the fiber to have a negative dispersion and to have a relative dispersion slope greater than 0.005nm −1 at a specific wavelength within a selected operating wavelength band, wherein the stretcher fiber has a dispersion and relative dispersion slope corresponding to that of a selected compressor module in a chirped pulse amplification system, wherein the selected operating wavelength band is between 1000 and 1100 nm.