Optical Line Protection (OLP) is a kind of optical fiber line automatic switching protection device, which is an automatic monitoring and protection system independent of the communication transmission system, completely built on the physical link of optical cable.If the primary fiber fails, the OLP can automatically switch from the primary fiber path to another alternate fiber path through real-time monitoring.It is commonly used with DWDM mux, EDFA, DCM and other devices to enable fiber expansion in optical transmission networks.In optical transmission networks, there are two common types of optical line protection:OLP1:1and OLP1+1.

OLP 1:1

The OLP1:1 optical line protection system adopts the method of selective emission and selective reception. There are two fiber paths: the primary path and the secondary path.The optical power sent from Tx port will be normally transmitted through the primary path,When the primary path fails, the sender and the receiver switch to the secondary path simultaneously.Widely used in PDH, SDH system, C / DWDM system, power communication private network, CATV optical network and other optical line protection.

OLP 1+1

Unlike the OLP1:1 system, the optical line protection 1+1 system is implemented based on dual emission and selective reception methods, which means that power can be transmitted through two paths at the same time. The optical power of the Tx port will be divided into two equal parts on the primary and secondary paths.At the receiving end,If one of the two links is detected with a power problem, the OLP will optionally receive lines with better signal quality.

HTF’s OLP optical protection card main function is to assist the wavelength division system to  complete optical layer protection solutions such as optical line 1+1 protection and optical wavelength 1+1 protection. It can monitor the primary and backup routing optical paths in real time.In the event of fiber core blockage or performance decline, it can be automatically rearranged on the main and standby fiber core to ensure the rapid recovery of optical signal in the system line.OLP technology is to complete the routing switching operation in the optical layer. The optical layer protection has the incomparable advantages of the upper layer business protection, and it is the best solution to provide users with uninterrupted communication.