Light trail is an unidirectional optical bus within WDM mesh networks that can transmit data between the convener (start) and the end node, and allows the intermediate nodes to participate in data communication. Recently, it is seen that splitting the light trail can improve the networks’ performance. However, the entire communication can come to an end, if a link failure occurs. In this paper we have proposed an algorithm namely, Split Light Trail Protection (SLTP) for protection of split light trail(s) against adjacent multiple link failures as well as non-adjacent multiple link failures, within the WDM mesh networks. Our proposed algorithm works for both static and dynamic split light trail(s). Recent studies shows that no previous works has been carried out for the protection of split light trail(s). Simulations in Matlab has been performed to calculate the blocking probability and throughput generated before and after the protection of split light trail(s). The time complexity calculated for the proposed algorithm SLTP is O(n3).