Method of rearrangement of optical amplifiers in fiber-upgraded elastic optical network

A method of rearrangement of optical amplifiers in a fiber-upgraded elastic optical network, wherein after the fiber links have been upgraded in the optical network, upgraded links are obtained and the following operations are performed on one of the upgraded links:

• attempting to traverse through the amplifiers on the upgraded link through a redundancy removal process to remove redundant EDFAs from the upgraded link and calculating the cost CRR saved by the redundancy removal process;
• attempting to rearrange the amplifiers on the upgraded link through a full rearrangement process to rearrange all the EDFAs on the upgraded link, and calculating the cost CFR saved by the full rearrangement process;
• comparing the cost CRR saved by the redundancy removal process with the cost CFR saved by the full rearrangement process on the upgraded link and selecting a process that saved more costs as the method of rearrangement of optical amplifiers on the upgraded link;
• and
• repeating the above steps to perform rearrangement of optical amplifiers on all the upgraded links sequentially and finish rearrangement for all the upgraded links.