TXO Optics verifies that the transceiver will meet the required distance in two ways.
The first method is to measure the optical power of the laser and the sensitivity of the receiver in order to ensure they each meet specified parameters and therefore will have sufficient optical budget to deliver the distance. This is typically achieved using lab instruments such as a power meter and also a variable attenuator.
At TXO Optics we take this a stage further and use fibre spools of various lengths to fully prove that the transceiver can function at the stated distance. This test is used in conjunction with a pair of EXFO testing instruments in order to push an appropriate traffic signal into the router / switch / optical device and then transmit it to another device via the transceiver under test and over an appropriate length of fibre. In this way the stated distance can be absolutely proven and at the same time a transmission test such as a RFC2544 test can be run in order to confirm transceiver performance.
Not all compatible transceiver vendors take such care in their testing procedures, and some do none at all. At TXO Optics we consult with the customer at an early stage in order to devise a testing procedure that meets customer’s needs. In addition we are very comfortable in inviting the customer to our testing lab in order to meet our team as part of this process.