A loopback test can be a hardware or software method which feeds a received signal or data to the sender. It can be used for an assist in debugging physical connection problems.
Fiber optic transceiver may be the fundamental part in any fiber optic communication network equipment. Its function is exactly the same as your computer’s Ethernet Card. (although nearly all modern computers integrate it about the motherboard, less another PCI card anymore)
Fiber optic transceiver has two ports, a transmitter port plus a receiver port. The fiber optic cable port sends out laser signal to your linked transceiver as well as the receiver port receives laser signal from the other transceiver.
On fiber optic transceiver manufacturing floors and also in R&D labs, we usually make use of a fiber optic loopback module to confirm the transceiver is working perfectly as designed as an alternative to using another transceiver as the partner.
Basically exactly what the loopback module does is directly routing the laser signal from your transmitter port to the receiver port. We can compare the transmitted pattern together with the received pattern to make sure they are identical and get no error.
The most popular kinds of Optical Transceiver are SC, LC and MTRJ connector types. But each connector type is split again by fiber type, connector polish type and attenuation.
Each connector type is offered for three fiber types. They can be 50/125um multimode, 62.5/125um multimode and 9/125um single mode.
Only PC polish is accessible for multimode type fibers. However for single mode fiber, two connector polish types can be purchased: UPC polish and APC polish.
Together with fiber type, working wavelength is definitely the other essential aspect for picking the proper fiber optic loopback module for your specific application. Available wavelengths are 850nm, 1310nm dexhpky91 1550nm. 850nm and 1310nm are for multimode applications and 1550nm is made for single mode applications.
You are able to specify just how the signal power level must be reduced in the loopback path. Simply because the receiver port cannot handle extremely high power. And in person fiber optic cable, there will always be attenuations created by fibers, equipment and physical environment. Therefore the transmitter power is attenuated to a safe level with the network before reaching the other receiver.