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Proceedings Paper

An ultra-narrow-band optical filter based on whispering-gallery-mode hybrid-microsphere-cavity
Author(s): Hongdan Wan; Haohan Zhu; Linqian Liu; Ji Xu; Jin Wang
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Paper Abstract

We demonstrate an ultra-narrow-band mode-selection method based on a hybrid-microsphere-cavity which consists of a coated silica microsphere. Optical field distribution and narrow-band transmission spectrum of the whispering gallery modes (WGM) are investigated by finite-difference time-domain method. WGM transmission spectra are measured for microsphere and tapered fibers with different diameters. A high refractive index layer coated on the microsphere-cavity make the Q factor increased, the transmission spectrum bandwidth compressed and the side-mode suppression ratio increased. Parameters of the hybrid-microsphere-cavity, namely, the coated shell thickness and its refractive index are optimized under different excitation light source as to investigate the whispering-gallery-modes’ transmission spectrum. The 3dB bandwidth of the proposed filter can be less than MHz which will have great potential for applications in all-optical sensing and communication systems.

Paper Details

Date Published: 19 October 2016
PDF: 5 pages
Proc. SPIE 10153, Advanced Laser Manufacturing Technology, 1015311 (19 October 2016); doi: 10.1117/12.2247002
Show Author Affiliations
Hongdan Wan, Nanjing Univ. of Posts and Telecommunications (China)
Haohan Zhu, Nanjing Univ. of Posts and Telecommunications (China)
Linqian Liu, Nanjing Univ. of Posts and Telecommunications (China)
Ji Xu, Nanjing Univ. of Posts and Telecommunications (China)
Jin Wang, Nanjing Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 10153:
Advanced Laser Manufacturing Technology
Bingheng Lu; Huaming Wang, Editor(s)

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