Patent ID: 11882390
Assignee: SOOCHOW UNIVERSITY
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for allocating a dedicated protected spectrum based on crosstalk awareness, comprising steps of:
step S1: initializing a space-division multiplexing elastic optical network, and generating a connection request;
step S2: calculating a plurality of working paths from a source node to a destination node, and determining whether the working paths are successfully established, wherein if not, the connection request is blocked, or if yes, the shortest path of the plurality of working paths is selected, a corresponding modulation format is selected according to the shortest path, and a quantity of spectrum slots required for the connection request and a first maximum allowable crosstalk threshold on a fiber optic link are determined according to a bandwidth demand of the connection request and the selected modulation format;
step S3: classifying cores according to the quantity of required spectrum slots, setting priorities for the cores, and determining whether available spectrum blocks in the cores meet a spectrum consistency constraint and a spectrum continuity constraint, wherein if not, the connection request is blocked, or if yes, inter-core crosstalk values of all available spectrum blocks are calculated, and it is determined whether the first maximum allowable crosstalk threshold is exceeded, and if yes, the connection request is blocked, or if not, a spectrum block with the smallest crosstalk value is selected for spectrum allocation;
step S4: deleting the currently established working paths, calculating a plurality of dedicated protection paths from a source node to a destination node, determining whether the dedicated protection paths are successfully established, wherein if not, the connection request is blocked, or if yes, the shortest path of the plurality of dedicated protection paths is selected, a corresponding modulation format is selected according to the shortest path, and a quantity of spectrum slots required for the connection request and a second maximum allowable crosstalk threshold on a fiber optic link are determined according to a bandwidth demand of the connection request and the selected modulation format; and
step S5: classifying cores according to the quantity of required spectrum slots, setting priorities for the cores, and determining whether available spectrum blocks meet a spectrum consistency constraint and a spectrum continuity constraint, wherein if not, the connection request is blocked, or if yes, inter-core crosstalk values of all available spectrum blocks are calculated, and it is determined whether the second maximum allowable crosstalk threshold is exceeded, and if yes, the connection request is blocked, or if not, a spectrum block with the smallest crosstalk value is selected for spectrum allocation.