Patent ID: 6640031
Filing Date: 2003-10-28
Classification: G02B

Abstract:
A dispersion compensating module comprising:a coupler adapted to couple with a first fiber designed to propagate light in a first mode, a reflective fiber grating operatively connected to the coupler, the fiber grating capable of converting the first mode into a second mode, and a second fiber operatively coupled through the coupler to the reflective fiber grating, the second fiber capable of propagating light in the second mode and a refractive index profile of the second fiber is selected to result in a negative dispersion at 1550 nm in the second mode of less than âˆ’300 ps/nm/km and greater than âˆ’1000 ps/nm/km, and a kappa value between about 30 nm and about 70 nm, where kappa is defined as a ratio of dispersion in the second mode at 1550 nm divided by dispersion slope in the second mode at 1550 nm of the second fiber.