Analysis of Two Parallel Long-Period Fiber Gratings

Chiang, Kin Seng; Chan, Frankie K. W.; Ng, Mei Nar

doi:10.1109/jlt.2004.825357

Cited by 58 publications

(37 citation statements)

References 23 publications

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“…To enhance the functionality of LPFGs, the structure of two or three parallel LPFGs has been proposed as a broadband optical coupler or optical add/drop multiplexer for applications in coarse wavelength division multiplexing systems, [181][182][183][184][185][186][187][188][189][190] where light launched into one fiber is coupled into another fiber through evanescent-field coupling between the cladding modes of the two parallel gratings. All of these couplers employ gratings written by the conventional UVlaser exposure technique.…”

Section: Couplersmentioning

confidence: 99%

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Review of long period fiber gratings written by CO2 laser

Wang

2010

Journal of Applied Physics

222

134

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This paper presents a systematic review of long period fiber gratings (LPFGs) written by the CO2 laser irradiation technique. First, various fabrication techniques based on CO2 laser irradiations are demonstrated to write LPFGs in different types of optical fibers such as conventional glass fibers, solid-core photonic crystal fibers, and air-core photonic bandgap fibers. Second, possible mechanisms, e.g., residual stress relaxation, glass structure changes, and physical deformation, of refractive index modulations in the CO2-laser-induced LPFGs are analyzed. Third, asymmetrical mode coupling, resulting from single-side laser irradiation, is discussed to understand unique optical properties of the CO2-laser-induced LPFGs. Fourthly, several pretreament and post-treatment techniques are proposed to enhance the efficiency of grating fabrications. Fifthly, sensing applications of the CO2-laser-induced LPFGs are investigated to develop various LPFG-based temperature, strain, bend, torsion, pressure, and biochemical sensors. Finally, communication applications of the CO2-laser-induced LPFGs are investigated to develop various LPFG-based band-rejection filters, gain equalizers, polarizers, and couplers.

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Section: Couplersmentioning

confidence: 99%

“…All of these couplers employ gratings written by the conventional UVlaser exposure technique. [181][182][183][184][185][186][187][188][189] Liu, et al 167 investigated experimentally all-fiber couplers formed by two parallel LPFGs written by high-frequency CO 2 -laser pulses and found asymmetrical coupling efficiency, as shown in Fig. 28.…”

Section: Couplersmentioning

confidence: 99%

Review of long period fiber gratings written by CO2 laser

Wang

2010

Journal of Applied Physics

222

134

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“…12 It has been shown that the coupling efficiency of the WSC can be maximised by introducing a finite offset between the LPFGs to increase the interaction length for evanescentfield coupling between the fibres and by using a suitable surrounding refractive index to expand the field distribution for better overlap with the other fibre.…”

Section: Wavelength-selective Coupler Incorporating Lpfgsmentioning

confidence: 99%

“…Chiang et al 12 provide a detailed theoretical analysis of a WSC consisting of identical uniform LPFGs. The coupling processes in the LPFG coupler are governed by the coupling coefficients K and C. The coupling coefficient K characterises an LPFG and serves as a measure of the power transfer between the LP 01 and LP 0k mode, as a result of the mutual overlap of the fields in the core area (where the coupling perturbation in the form of a refractive index modulation is situated).…”

Section: 12mentioning

confidence: 99%

“…11 Four-port and sixport WSCs consisting of two and three parallel LPFGs, respectively, have been demonstrated. 7,12,13 In this paper, theoretical and experimental results are presented of a narrowband wavelengthselective coupler consisting of two parallel, axially symmetric LPFGs fabricated with a CO 2 laser. Experimental results of a broadband WSC are also presented.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the power coupling of novel wavelength-selective couplers incorporating axially symmetric long-period fibre gratings

2011

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How to cite this article:Kritzinger R, Meyer J, Burger J. Investigation of the power coupling of novel wavelength-selective couplers incorporating axially symmetric long-period fibre gratings. S Afr J Sci. 2011;107(5/6), Art. #400, 7 pages. doi:10.4102/sajs. v107i5/6.400 Evanescent-field coupling was studied experimentally in novel optical-fibre-based wavelengthselective couplers, using axially symmetric long-period fibre grating (LPFG) structures. The coupling characteristics of a wavelength-selective coupler at the resonant wavelength were investigated for different LPFG offset distances. It was shown that the wavelength-selective couplers effectively transferred light power at the LPFG resonant wavelength from one fibre to another. The performance of the couplers was consistent with simulations performed in MATLAB using coupled-mode theory.

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Light Coupling and Passive Optical Devices

Azadeh

2009

Optical Networks

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Analysis of Two Parallel Long-Period Fiber Gratings

Cited by 58 publications

References 23 publications

Review of long period fiber gratings written by CO2 laser

Review of long period fiber gratings written by CO2 laser

Investigation of the power coupling of novel wavelength-selective couplers incorporating axially symmetric long-period fibre gratings

Light Coupling and Passive Optical Devices

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