| 摘要 |
<p>The system includes a source of polarised electro-magnetic radiation (1) such as a laser whose output radiation is fed to a polarisation modulator (2). The modulator (2) is responsive to digital information to cause, in successive clock periods, changes in polarisation of the radiation. The polarised radiation is transmitted along optical fibre (4) to a receiver where it is coupled to another optical wave of fixed polarisation. The resultant IF radiation is detected by a detector (7) and the differential phase and/or amplitude of the detected IF radiation is determined. From this information, the original digital data is reconstituted.</p> |
