Research On The Key Technology Of The Optical Label Switching Based On Pol-SK Label And DPSK Load

Optical packet switching is considered to be one of the best optical switching modes. The optical label switching technology is the effective technology to achieve optical packet switching. In the switching node, we convert the lower-rate optical label signals into electrical signals for processing, while the payload in the form of light signals through optical switching nodes without any electrical treatment. In this paper, we propose a novel optical label switching scheme based on Pol-SK/DPSK time division multiplexing. We focus on the generation, writing and extraction of optical label signal. The main contents are as follows:Firstly, we introduce the structure of MZ-LN and measure the half-wave voltage and the zero-point-voltage at which the output power is zero. Our experimental results demonstrate that the curve of half-wave voltage has offset voltage and the zero-point will drift during working. We experimentally research the impact of zero-point drift on the NRZ code and DPSK signal. We analyze the reason for generating zero-point drift, and propose a method to suppress the zero-point drift.Secondly, we propose a novel optical label switching scheme based on Pol-SK/DPSK time division multiplexing. Compared with other optical label switching schemes, the optical power in this scheme will produce less jitter in the process of optical transmission, which reduces the effect of fiber nonlinearity. We also introduce the principle of Pol-SK and DPSK signal modulation and demodulation.Finally, we present a novel frame synchronization scheme with optical label and payload based on FPGA. In this paper, the optical label signal which rate is622Mb/s is generated by the FPGA. The payload signal which rate is10Gb/s and we can get its signal envelope by let it through a low-pass filter circuit. We can achieve the frame synchronization with optical label and payload by using this signal envelope to trigger FPGA to generate the label signal. In this paper, we implement the writing and extraction of optical label in time division multiplexing optical label switching technology. And we demodulator the Pol-SK/DPSK signal which we generate to verify the reliability of the frame synchronization scheme.