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As the size and the complexity of optical mesh networks grow, double-link failures become more probable. To protect against double-link failures, we generally have to provision more backup resources with respect to single-link failures. To improve the resource efficiency, it is important to reduce backup resources used for surviving double-link failures. In this paper, we investigate some representative sharing schemes and propose an enhanced resource sharing scheme with resource contention resolution for double-link failures in survivable optical mesh networks. By fully taking into account the temporal and spatial factors, our scheme can accommodate reasonable contention for sharing resources and minimize backup resources for reservation with 100% protection guarantee. Simulation results show that this enhanced resource sharing scheme can achieve satisfactory performance in terms of resource utilization ratio and blocking probability.