In this paper, we experimentally present a novel, all-optical spectral efficient vertical-cavity surface-emitting laser- (VCSEL-)\nbased technique for routing and spectrum assignment in optical networks. Exploiting all optical VCSEL-to-VCSEL injection to\nattain cross gain modulation, the optical transmitter is optimized for optical transmission paths to assure quality of service by\novercoming blockage for differentiated bandwidth demands during network congestion incidences. A 10 Gbps directly modulated\n1549 nm master VCSEL is optically injected into the 1549nm side modes of a 1550nm slave VCSEL. The Shannon limit is\nconsidered for higher transmission rates with the problem decomposed into degraded routing and spectrum assignment and\nchromatic dispersion in the optical transmission link penalties. In this work, the proposed technique achieved a 1.3 dB penalty for\ntransmission over a 25km G.655 nonzero dispersion-shifted single-mode optical fibre, a value within the transmission media and\noptical system characteristics of 3 dB as recommended by the International Telecommunication Union-Telecommunication (ITU-T).\nThe number of transceivers, switches, and optical transmission links in the network was reduced, increasing the number of satisfied\nbandwidth requests, thus optimizing the spectral resource utilization.
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