Proposed in this paper is a flexible scheme of all-optical packet header extraction with SOA-based asymmetric Mach-Zehnder interferometer (SOA-MZI). The effect of cross-phase modulation (XPM) and cross-gain modulation (XGM) in SOAs coupled with the interfering characteristics of MZI are employed to make the proposal simple, fast and integrable, with no special treatment of the header pulses. In addition, the scheme, by changing parameters, is applicable to extraction of different header length and bit-rate. Through numerical analysis, an intensity contrast ratio of more than 15dB at 100Gbit/s can be achieved.
Proposed in this paper is an extension from a basic 2×2 contention resolving scheme to a complex N×N scheme for asynchronous variable length packets, through which contentions among multiple packets will be resolved. At first, a fast comparison algorithm is presented to build N×N all-optical contention resolution node based on 2×2 contention resolving scheme. Given the comparison algorithm, the number of basic 2×2 switching node that an N×N node demands are calculated and discussed, corresponding simulations are conducted and the packet-loss probability is tested. Moreover, further simulation is performed to evaluate the performance of the 8×8 bufferless all-optical contention resolving scheme equipped with limited-range wavelength converters (LRWCs).
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