Which OLTS testing method is known to simulate the loss of two mated pairs in an optical fiber link?

The method known to simulate the loss of two mated pairs in an optical fiber link is the two jumper method. This technique involves connecting two jumpers in the optical path, which creates a situation where the connection resembles the loss of two pairs due to the introduction of additional connectors, effectively simulating real-world conditions in the fiber link.

In more practical terms, this method allows technicians to assess the performance of fiber optics by measuring the loss introduced by the connectors and ensuring that the link can operate within acceptable limits. By employing this method during testing, a clearer understanding of the link's behavior in actual use can be gained, and potential issues with insertion loss can be identified ahead of time.

The other testing methods do not appropriately simulate the scenario of two additional mated pairs. For instance, the one jumper method would not create enough mated connections to replicate the conditions accurately, while the loopback method typically tests the transmission and reception capabilities using a single cable, without the added loss considerations of additional fibers. Thus, the two jumper method is the most fitting choice for simulating the scenario described in the question.