An improved integrating power method is proposed to enhance the accuracy of distributed polarization crosstalk measurements of the polarization maintaining fiber (PMF). This method obtains crosstalk ...via calculating the power of the interference peaks. However, when the coupling coefficients of the crosstalk points are weak enough, the amplitudes of the interferogram are vulnerable to the noise. It will diminish the accuracy of the crosstalk measurement. When the coupling is excessive, the crosstalk calculated by the method is inconsistent with the true value because the coupling mode cannot be ignored compared to the exciting mode. The theoretical analysis and experimental results demonstrated that the error sources can be predicted and then be eliminated by using the methods proposed in this paper.
The meiofauna of Dongzhai Harbor Mangrove was investigated,and,chlorophyll a( Chla) and organic matter content of the sediments were determined,in April( spring),June( summer),and October( autumn) of ...2015 and January( winter) of 2016.Furthermore,correlations between meiofauna abundance and Chla and organic matter were analyzed for different seasons. Results showed that the main meiofauna groups were Nematoda,Copepoda,Turbellaria,Polychaeta,and Oligocheata. Content of organic matter was 25. 22%-93. 41%,with an average value of 46. 6%. Content of Chla was0.188-6.303 μg/g,and the average content was 1. 731 μg/g. Correlation analysis showed that there was a significant positive correlation between abundance of meiofauna and Chla content in spring( Pearson' s r = 0. 684; P < 0. 05). The abundance of meiofauna was negatively correlated with organic matter content in summer( Pearson's r =-0.518; P<0.05).
