Abstract
This paper focuses on the Arrayed Waveguide Grating Router-Load Balanced(AWGR-LB) switch,a promising candidate for the fifth generation packet switching architecture.The LB switch needs little scheduling but its performance is not very satisfactory for its strict time-division multiplexing manner.AWGR-LB can greatly increase the switching capacity;nevertheless,the transmission delay within the switch fabric is too large compared with traditional ones for its channel rate within the fabric can only be implemented at one N-th of the port rate(N is the switch size),hence makes QoS unsatisfactory.This paper introduces an Adaptive TDM(ATDM) scheduling manner,which dramatically decreases the delay of LB switches while still keeping 100% throughput.By using the authors' dual AWGR design,which can emulate the operation of the traditional crossbar and provide port-rate switching,combined with the ATDM scheme,the performance of AWGR-LB can be further improved.
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