| 摘要 |
A method of monitoring an optical fibre comprises modulating an optical signal with a traffic signal; modulating the optical signal with an incoherent optical frequency domain reflectometry, IOFDR, test signal; transmitting the doubly modulated optical signal onto an optical fibre at a first end of the fibre; detecting scattered radiation output from the first end of the fibre; and analysing the detected scattered radiation using incoherent optical frequency domain reflectometry to determine a distance to a break in the optical fibre. Apparatus suitable for carrying out the method is also described, as well as an optical communications network employing the method. |
