Wavelength-Division multiplexing (WDM), which allows a single fibre to carry multiple signals simultaneously, has been widely used to increase link capacity and is a promising technology in backbone transport network. But designing such WDM backbone network is hard for two reasons, one is the uncertainty of future traffic demand, the other is difficulty of planning of the backup resource for failure conditions. As a result, enormous amount of link capacity for the network has to be provided for the network. Recently, a new approach called Valiant Load-Balanced Scheme (VLBS) has been proposed to design the WDM backbone network. The network planned by Valiant Load-Balanced Scheme is insensitive to the traffic and continues to guarantee performance under a user defined number of link or node failures. In this paper, the Valiant Load-Balanced Scheme (VLBS) for backbone network planning has been studied and a new Valiant Load-Balanced Scheme has been proposed. Compared with the early work, the new Valiant Load-Balanced Scheme is much more general and can be
used for the computation of the link capacity of both homogeneous and heterogeneous networks. The abbreviation for the general Valiant Load-Balanced Scheme is GVLBS. After a brief description of the VLBS, we will give the detail derivation of the GVLBS. The central concept of the derivation of GVLBS is transforming the heterogeneous network into a homogeneous network, and taking advantage of VLBS to get GVLBS. Such transformation process is described and the derivation and analysis of GVLBS for link capacity under normal and failure conditions is also given. The numerical results show that GVLBS can compute the minimum link capacity required for the heterogeneous backbone network under different conditions (normal or failure).