Optical fibers and modules for dispersion compensation with simultaneous raman amplification

摘要

An optical fiber suited for dispersion compensation with simultaneous Raman amplification. The fiber has a central core and an index profile that defines successively concentric regions radially outward of the core. The core has a diameter of between 2 and 5 microns (µm) and a refractive index difference (Δn) with respect to the outer cladding of between 0.012 and 0.035. A trench region adjacent the core is between 2 and 6 µm wide and has a negative Δn of between -0.015 and -0.003. A ring region adjacent the trench region is between 1 and 5 µm wide and has a Δn of between 0.001 and 0.015, and an inner cladding surrounding the ring region has a width of between zero and 5 µm and a Δn of between -0.011 and 0.001. A dispersion slope compensating module (DSCM) including the fiber obtains a relatively high Raman gain with respect to conventional DSCMs that are pumped for Raman amplification.