The first long-wavelength VCSEL based WDM link over a distance of 50km is d
emonstrated. Error-free transmission at a speed of 10Gbit/s is achieved ove
r 50km of standard singlemode fibre. The link comprises four individually m
odulated L-band VCSELs each transmitting at a speed of 2.5Gbit/s. No crosst
alk is observed between channels. Our system is suitable for deployment in
metro networks where low cost combined with high data rates are paramount.