A key issue in networks design is to optimize routing and wavelength assignment ( rwa ) for lightpaths . rwa solves how to find out an appropriate lightpath and assign a wavelength reasonably in order to make full use of the limited resource and provide communication capability as large as possible 優(yōu)化光通道的選路和波長分配(rwa)是網(wǎng)絡(luò)設(shè)計的核心問題,其主要任務(wù)是尋找一條合適的光路并為之合理地分配波長,使有限的資源充分發(fā)揮作用,以提供盡可能大的通信容量。