Analogue and digital transmission using polymer optical fibre
The performance of a hybrid AM/BPSK (amplitude modulated/binary phase shift keying) polymer optical fibre transmission system has been investigated. A BPSK modulated 2 Mbit/s pseudorandom digital channel is substituted for one of the AM channels in a 60-channel cable TV system. For the digital channel, a bit error rate of < 10–9 is obtained after transmission through 200 m of fibre. The results show that distortion caused by laser nonlinearity did not degrade the system at low modulation depth.