| 摘要 |
The present invention relates to a device for monitoring an optical fibre comprising a photo-sensitive device arranged to produce an electric pulse from an optical pulse injected at a first node of the optical fibre, a delay element and a first optical circulator arranged to delay the optical pulse injected at the first node of the optical fibre. Further, the device comprises an optical amplifier arrangement arranged to receive the optical pulse at its input and the produced electric pulse as an operating signal, for producing an amplified optical pulse. Moreover, the device comprises a second optical circulator arranged to receive the amplified optical pulse at a first port and output the amplified optical pulse at a second port connected to a second node of the optical fibre, and to receive an optical signal reflected back from the optical fibre at the second port and outputting the reflected optical signal at a third port. |
