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Under the constraints of wavelength continuity and the number of transceivers per node, we investigate the problem of provisioning protection-at-lightpath (PAL) level for connections in grooming WDM mesh networks and propose two grooming policies for PAL, i.e., minimal wavelength-link policy (MWP) and minimal transceiver policy (MTP). Based on a protection graph model (PGM), we develop two dynamic PAL algorithms with MWP and MTP, which are called minimal wavelength-link method (MWM) and minimal transceiver method (MTM), respectively. We study and compare the performance of MWM and MTM with other methods utilizing different grooming policies via simulations. Our results show that MWM and MTM outperform other methods significantly and MWM has a better performance than MTM.