A dual concentric core fibre exhibiting a chromatic dispersion coefficient around -350 ps/(nm km) is used in a dispersion compensating module designed for WDM application. The optimised length ratio is larger than 20 and the residual chromatic dispersion is measured at 0.4 ps/mm km) in the C-band.
A numerical model used for the design of cladding-pumped EDFAs has been implemented showing fair agreement with measured power conversion efficiencies. The model takes into account real multimode structure and enables design of ring-doping EDFA
An EDFA covering the full C-band has been operated with a record output power of +33 dBm, owing to a new 50-mum pump design incorporating 100-mum diodes
A first experimental demonstration of benefit brought by photonic crystal fibers in amplification applications is reported with an air-clad ring-doping wideband cladding-pumped EDFA.