Abstract
Optical label switching (OLS) is regarded as one promising solution for the packet-based optical switching. In this paper, a novel modulation, i.e., Manchester code + NRZ modulation is proposed for OLS. The Manchester coded payload signal the NRZ label signal are combined and then modulated onto an optical carrier by only one ASK modulator. The Manchester coded payload signal and the NRZ label signal are recovered by half-bit-delayed differential and a low-speed ASK receiver, respectively. Better than traditional orthogonal modulation, the proposed Manchester code + NRZ modulation requires no non-amplitude modulation and only one ASK modulator, reducing the equipment cost, modulation loss and operation complexity. The coding is simple and decoding is not required. According to theoretical analysis and simulation test, the induced crosstalk decreases with the bit rate ratio. The tested results verify the feasibility of the OLS based on the proposed Manchester code + NRZ modulation.
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