Dynamic Wavelength and Bandwidth Allocation in Flexible TWDM Optical Access Network

As one of the most promising next generation optical access network (OAN), flexible time and wavelength division multiplexing (TWDM) OAN can increase capacity smoothly and reallocate wavelength and timeslot resource dynamically to cope with variations in traffic pattern. However, the scheduling of both wavelength and timeslot resource becomes a critical problem. In this letter, a dynamic wavelength and bandwidth allocation (DWBA) solution including the DWBA mechanism, mixed integer linear programming (MILP) model, and two heuristic algorithms is proposed to solve the scheduling problem. By comparison of the two algorithms, only one algorithm is selected to support 10-year lifetime. Under different traffic patterns, the selected DWBA algorithm has better bandwidth utilization and lower delay in contrast with the static wavelength allocation (SWA). The backward compatibility and cost efficiency of flexible TWDM OAN are also discussed.