| 摘要 |
In a method of transmitting an electromagnetic signal in an optical fibre a polarised optical base signal is generated and input at a first end of an optical fibre; an optical signal emerging from the fibre after the base signal has passed through it is recovered at a second end of the fibre; this emergent signal is processed by electro-optical modulation with the electromagnetic signal which is to be transmitted and polarisation conversion is effected, and the optical signal modified in this way is reinput to the said second end of the fibre; an optical return signal emerging from the fibre after the modified optical signal has passed through it is recovered at the first end of the optical fibre and this is analysed in order to determine the characteristics of the electromagnetic signal.
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