Studies of monomode long wavelength fiber systems at the British Telecom Research Laboratories

The key components of long wavelength monomode systems to operate in the 1300 and 1550 nm windows have been under study for some years to establish the best combination of operating parameters for intercity land and undersea use. Recently, two prototype systems have been assembled with 37 and 49 km repeater spacings, operating at 140 Mbits/s and at 1300 and 1500 nm, respectively. Higher bit rate systems are also under study.