| 摘要 |
An optical data transmission system comprises a laser 2 for launching polarised light into one end of a polarisation maintaining optical fibre 1, 4 on two orthogonally-related polarisation modes AA, BB and modulating transducers 5, 6, 7 operable in accordance with data to be transmitted along said optical transmission path to provide variable mechanical stressing of the optical fibre, which consequentially produces differential phase modulation between the two polarised light signals being transmitted along said fibre. Detector means 11 is responsive to such differential phase modulation for the detection of the data content transmitted. The data may be multiplexed by the use of different modulation frequencies F1, F2, F3. <IMAGE> |
