Abstract

We study potential performance gains resulting from deliberate use of signal regeneration along with modulation and spectrum conversion in translucent elastic optical networks, realizing superchannel transmission. We analyze three alternative scenarios that differ in the way in which translucent lightpath connections are provisioned. Namely, a basic one in which the use of regenerators is minimized and two other cases that are more flexible in terms of signal regeneration and modulation conversion. To compare these scenarios, we focus on the problem of routing, spectrum, transceiver, and regeneration allocation (RSTRA). In RSTRA, in addition to classical RSA constraints, the selection of regeneration sites together with adaptation of modulation formats and assignment of transceivers to lightpaths is taken into account. To formulate the RSTRA optimization problem, we apply the integer linear programming approach, and to generate RSTRA solutions, we develop a heuristic algorithm. The results of numerical experiments show that intentional signal regeneration and adaptation of modulation formats of optical carriers can be beneficial in terms of both spectrum and transceivers utilization in long-distance networks; however, the savings are negligible in a small-distance network.

© 2016 IEEE

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