C+L-band 2,160 km bidirectional transmission using three vendor-installed 4-core fibre cables

Full C+L-band transmission is experimentally demonstrated using multivendor 4-core fibre cables installed in an outdoor environment. By applying bidirectional transmission technology to suppress core-to-core XT, the transmission distance can be extended to 2,160 km, which is 1.5 times longer than that for unidirectional transmission.