An Optimal Investment Strategy for Tunable, Pluggable, and Tunable Pluggable Optical Transceivers in Static DWDM Networks

Wavelength division multiplexing (WDM) systems enable transmission capacity to be significantly enhanced and facilitate the integrated management of diverse protocols. The number of backup transponders in a static dense WDM (DWDM) system can be effectively reduced by using tunable lasers, 10-gigabit small form factor pluggable (XFP) transceivers, and XFP transceivers with a tunability function. In this paper, two failure recovery strategies are described for static DWDM networks that use fixed wavelength assignment, and an optimal investment strategy is derived for selecting optical transceivers to be used for backup. The strategy is based on the compatibility between the field and backup transponders. The failure recovery strategy and optical transceiver type to be used for backup should be selected on the basis of not only the initial investment costs but also the operation costs and the networkpsilas switching system.