Fibre Loopbacks

Fibre loopback cable is used to provide a return patch for an optical signal, especially for fibre optic testing applications and network restorations. Loopback cable can determine where the fault might lie. Like a fibre optic patch cord, fibre loopback cable can be classified according to the fibre type used and the fibre optic connector type. Loopback cable is available in single-mode and multimode as well as LC, SC, MTP/MPO. 

Fibre loopback cable is often used to check whether a fibre optic transceiver operates normally. During the testing process, the fibre loopback cable directly routes the laser signal from the transmitter port to the receiver port. Then by comparing the transmitted pattern with the received pattern, you can check that the transceiver is identical and has no errors.  

MPO loopback cables are mainly used for testing parallel optics, such as 40G and 100G transceivers. These cables are available in 8,12 and 24 fibres, which can be applied according to different requirements of testing applications.  

Fibre loopback cable is designed for equipment testing, self-testing, engineering, network diagnostics and measurement applications. It plays an essential role in troubleshooting in laboratories and manufacturing environments. It also provides a cost-effective way of testing the transmission capability and receiver sensitivity of optical network equipment. When choosing a suitable type of fibre loopback cable, you should take the connector, polish and cable type into consideration. 

Loopback Applications 

  • Central offices 
  • Data centres 
  • Local Area Networks (LAN's) 
  • FTTH networks 
  • Test and measurement laboratories 

Speak to one of our fibre specialists to discuss your requirements. Email or contact us on 01234 848030.