Ultrafast Optical Header Processing with DPSK for Asynchronous Optical Packet Switch

摘要

An optical header extraction and recognition structure was presented in the paper. The optical header is extracted by the improved iTOAD structure with DPSK modulation, while the header recognition is realized by discrete time stretch technology with super-continuum pulse to slow down the optical header speed for the high-speed asynchronous optical packet switch. Analysis and Experimental results shows that the iTOAD with time stretch technique can enlarge the output header 20dB and improve the switching ratio to 15dB when the input pulse is only 0.1pJ. By adjusting the tunable FDL length, the two pulses after the coupler switching have the π phase shift in the iTOAD SOA. The structure can slow down the high-speed optical header speed. Furthermore, the low speed header has the low latency time decreases (latency time less than 100μs) and overcomes the drawbacks of time bandwidth limitation associated with dispersion in long lengths of fiber. The system is highly scalable, lower power consumption and photonic integration.