The supercell- based orthonormal basis method is proposed to investigate the modal properties of the Bragg fibers. A square lattice is constructed by the whole Bragg fiber which is considered as a supercell, and the periodical dielectric structure of the square lattice is decomposed using periodic functions (cosine). The modal electric field is expanded as the sum of the orthonormal set of Hermite-Gaussian basis functions based on the opposite parity of the transverse electric field. The propagation characteristics of Bragg fibers can be obtained after recasting the wave equation into an eigenvalue system. This method is implemented with very high efficiency and accuracy.
The APMP key comparison on attenuation, APMP.EM.RF-K19.CL, is a linking comparison to CCEM.RF-K19.CL, to link attenuation results between APMP and CCEM in order to support the CMC claims of some laboratories who did not participate in the CCEM attenuation comparison. The measurement ranges and frequencies were the same as in the associated CCEM comparison, and the travelling standard that was used in the APMP comparison was the same model as one of the two travelling standards used in the CCEM attenuation comparison. There were nine participant laboratories in the comparison including six linking laboratories that had participated in the CCEM attenuation comparison. The comparison pilot laboratory was NIM, China.The report of the comparison presents the linking results, the method of the linking calculation and the analysis of uncertainty contributions which affect the linking correction values. The results show that the travelling standard was stable during the period of time of the measurement loop and the results from linking laboratories were in fairly good agreement after discarding a couple of outlier points. The measurement results from the laboratories having participated in the APMP comparison only show a good degree of equivalence with the CCEM key comparison reference value except for one point.The key point is the calculation of the linking correction values. The question of identifying outliers from measurement results of linking laboratories was considered carefully in the report. The measurement results from linking laboratories were not used in the calculation of the correction values if the difference between APMP and CCEM measurement results, or measurement results in the CCEM comparison, were outliers. The 'median method' was used to identify the outliers. The calculated results show that the process of outlier identification was reasonable and reliable.Main text.
To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
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