Journal of University of Science and Technology of China ›› 2010, Vol. 40 ›› Issue (10): 1082-1086.DOI: 10.3969/j.issn.0253-2778.2010.10.013
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YANG Li
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Abstract: A new suggestion of making chiral fiber gratings and all-fiber circular polarizers by spinning strain-induced high birefringence fibers was presented. By means of coupled-mode theory, it is shown that a circular polarizer might be achieved by using a spun Bow-Tie fiber or Panda fiber with short pitches of less than one millimeter. Unlike the special chiral fibers previously mentioned, these strain-induced high birefringence fibers are commercially available and are easy to be spliced with common fibers. The coupled-mode analysis also reveals the scheme of polarization-selectivity between coupled modes and the necessary conditions for achieving polarizers in these kinds of chiral fiber gratings. A numerical simulation was done on a spun Panda fiber, and it is shown that in a right-handed rotating birefringent fiber with a numerical aperture of 0.186 5, a beat length of 125 millimeter, a rotation pitch of 0375 millimeter and a fiber length of 332 millimeter, a left-circular polarization light would output at the wavelength of 155 micron.
Key words: circular polarization, coupled-mode theory, spun fiber, polarizer
YANG Li, LI Cheng, SU Jue, QIAN Jingren. Principle and theoretical analysis of all-fiber circular polarizers[J]. Journal of University of Science and Technology of China, 2010, 40(10): 1082-1086.
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URL: http://just-cn.ustc.edu.cn/EN/10.3969/j.issn.0253-2778.2010.10.013
http://just-cn.ustc.edu.cn/EN/Y2010/V40/I10/1082