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Analysis of two parallel long-period fiber gratings

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3 Author(s)
Kin Seng Chiang ; Dept. of Electron. Eng., City Univ. of Hong Kong, China ; Yuen Ming Chan, F. ; Mei Nar Ng

A wavelength-selective coupler constructed with two parallel identical uniform long-period fiber gratings (LPFGs) is analyzed by the coupled-mode theory. The effects of introducing a longitudinal offset distance between the two gratings on the transmission characteristics of the coupler are discussed and the conditions for achieving a 100% coupling efficiency are highlighted. It is found that 100% coupling can be achieved with a practical grating length by using a proper grating design and a suitable index-matching surrounding medium. The theoretical results agree well with the experimental data.

Published in:

Lightwave Technology, Journal of  (Volume:22 ,  Issue: 5 )

Date of Publication:

May 2004

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