Analysis of two parallel long-period fiber gratings

Analysis of two parallel long-period fiber gratings

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 discusse...

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Veröffentlicht in:Journal of lightwave technology 2004-05, Vol.22 (5), p.1358-1366
Hauptverfasser: Kin Seng Chiang, Chan, F.Y.M., Mei Nar Ng
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Bragg gratings
Circuit properties
Construction
Design engineering
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Fiber gratings
Fibers
Integrated optics. Optical fibers and wave guides
Joining
Offsets
Optical and optoelectronic circuits
Optical coupling
Optical fiber couplers
Optical fiber theory
Optical filters
Refractive index
Resonance
Strain measurement
Temperature sensors
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Beschreibung
Zusammenfassung: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.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2004.825357