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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 22,
  • Issue 5,
  • pp. 1358-
  • (2004)

Analysis of Two Parallel Long-Period Fiber Gratings

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Abstract

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.

© 2004 IEEE

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