Dispersion compensating optical fibre with quadruple clad

摘要

Embodiments of the invention include an inverse dispersion fiber (50) having a doped core region (51) with an index of refraction n1, a cladding region (55) with an index of refraction n2, and a trench region (52), a first barrier region (53) and a second barrier region (54) with indices of refraction n3, n4, and n5, respectively, formed between the doped core region and the cladding region. The various regions of the inverse dispersion fiber are manufactured in such a way that the refractive index value ranges are, for example, 0.745% (n1-n2)/n2 0.759%, -0.403% (n3-n2)/n2 - 0.394%, 0.152% (n4-n2)/n2 0.166%, and -0.083% (n5-n2)/n2 -0.041%. Inverse dispersion fiber has a chromatic dispersion of approximately -40 picosecond/(nanometer-kilometer) and a relatively large effective core area, Aeff, for example, greater than approximately 30.0 µm2, both at a wavelength of 1550 nm.