In conventional optical networks, optoelectronic conversions are needed in each node for the sake of a proper packet routing. Simultaneously, intensive managing resources should be allocated to accomplish the routing task. The correct introduction of intelligence and functionality within the network physical layer may lead to some advantages over conventional networks. Two advantages are worthwhile be mentioning (a)-no optoelectronic conversions (O/E/O) are needed, except for the source and destination nodes, and (b)-management resources are practically unnecessary within the physical layer. As the network uses a graph representation, it is possible to reach minimal cost criteria. Next, coping with the minimal cost, suitable algorithms are used for proper wavelength routing. The desired connectivity is introduced, and the algorithms will lead to the technique of capacity reuse within the wavelength. In this way, light-paths are obtained, linking all network node pairs. We called this arrangement as SWRA (Smart Wavelength Routing Assignment), since within the network each wavelength follows its precise path in a passive way. The result appears as a significant cost reduction, which reflects the lack of O/E/O converters and on the use of less management gear. However, this arrangement may suffer occasional data collision within any wavelength. Hence, a solution to avoid this impairment is presented and described, using low-cost electric buffers. Additionally, the statistical evaluation of those buffers is supplied.