25 Gb s(-1) data transmission using a bismuth-doped fibre amplifier with a gain peak shifted to 1300 nm

Using a bismuth-doped aluminosilicate. fibre laser tunable in the range 1130-1210 um, we have examined the effect of pump wavelength on the gain spectrum of bismuth-doped phosphosilicate fibres in the range 1220 -1400 nm. At a pump wavelength of 1195 nm, we obtained a peak gain wavelength of 1300 nm, which is near the centre of the standard range for O-band transmission (1270-1320 nm) in fibre-optic communication links, in particular between data centres. Using a bismuth-doped phosphosilicate fibre amplifier pumped at 1195 nm, we have demonstrated that the transmission distance for a signal from a semiconductor laser diode directly modulated at 25 Gb s(-1) [on-off keying (OOK) modulation] can be increased for G.652 fibre from the standard 10 to 80 km or even more.