Influence of the longitudinal mode field in grating scattering from weakly guided optical fiber waveguides

Li, Yufeng; Wielandy, S.; Carver, G.E.; Durko, Heather L.; Westbrook, Paul S.

doi:10.1364/ol.29.000691

Cited by 11 publications

(7 citation statements)

References 8 publications

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“…As reported by Li et al [13], tap devices in a standard single-mode fiber show polarization-dependent scattering (PDS). However, the PDS of the ratio of two grating taps PDS can be smaller than that of a single tap.…”

Section: B Polarization Dependencymentioning

confidence: 74%

Ultrawide Bandwidth Wavelength Monitor Based on a Pair of Tilted Fiber Bragg Gratings

Tissot

Limberger

Salathé

2007

IEEE Photon. Technol. Lett.

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Abstract-A wavelength monitor based on a pair of tilted fiber Bragg gratings is reported. The monitor exhibits a subpicometer wavelength selectivity over a broad wavelength range (>30 nm), and a low insertion loss (<1 dB) for laser light with polarization matching the reference polarization of the device. Simulations show that a wavelength coverage up to 100 nm is possible and that the resolution degradation due to changes in the polarization state can be avoided by proper design of the gratings.

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Section: B Polarization Dependencymentioning

confidence: 74%

Ultrawide Bandwidth Wavelength Monitor Based on a Pair of Tilted Fiber Bragg Gratings

Tissot

Limberger

Salathé

2007

IEEE Photon. Technol. Lett.

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“…This model correctly predicts that the m = 1 mode is dominant, and this final form of scattered power is very promising for future theoretical considerations, however the I core parameter is not trivial as it requires a complex analysis further explained in Kashyap's model. Furthermore, this derivation ignores the z-component of the electric field, which according to literature 13 is not negligible for this phenomenon.…”

Section: Visible Diffraction Efficiencies In Tilted Fibre Bragg Gratingsmentioning

confidence: 99%

“…In contrast with this coupled-wave approach, there is also the Volume Current Method approach adopted or explored by certain groups. [9][10][11][12][13] The former coupled-wave approach is also adopted by other groups to explain optical fiber sidetap phenomena. [13][14][15][16][17][18][19][20][21] In Kashyap's model 17 (Section 2.7) the net filter response, or power, of the diffraction grating depends on the degree of both longitudinal and transverse phase matching.…”

Section: Tilted Fiber Bragg Gratingmentioning

confidence: 99%

“…Since the Coupled Mode Theory (CMT) inherently breaks down for radiation perpendicular to the fiber axis, and since this particular configuration is of great interest for grating outcoupling, the VCM as an approach is often better suited as a design tool for this purpose. However, this research is experimental in nature and not confined to perpendicular radiation so the theoretical derivations of the VCM are considered outside the scope of this research, though information on the VCM is readily accessible in the literature [9][10][11][12][13] .…”

Section: Visible Diffraction Efficiencies In Tilted Fibre Bragg Gratingsmentioning

confidence: 99%

“…where l is the grating length and ̃ (A. 13) This effective index modulation can thus be used to measure the relative coupling strength between the core mode and resonant modes. Table showing mode number (see below for visual representation -not to be confused with m number), effective index for each mode, and the outcoupling angle for each mode for gratings between 10° and 37.5°, where the tilt is shown at the top of the table.…”

Section: Large-angle Grating Fabrication: Improved Design and Efficiencymentioning

confidence: 99%

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Experimental Investigation of Visible Diffraction in Tilted Fibre Bragg Gratings

Dakka¹

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We present an analysis on the visible diffraction patterns of Tilted Fiber Bragg Gratings (TFBG), with applications to blue-laser fiber sensors. On the basis of our current understanding of a visible diffraction phenomenon called sidetapping, or outtapping, we compare theoretical predictions with experimental results. In order to compare theory to experiment we obtain empirical observations of diffraction angles. A 1550nm-TFBG is connected to a Coherent Spectrum-70C laser source and measurements are taken for several wavelengths including red (647.1nm), yellow (568.2nm), green (514.5nm), blue (488.0nm) and violet (457.9nm) to show that our results are in definite agreement with theory. There are other variables that affect and govern this diffraction behaviour so a comprehensive parameter study is used to relate the input variables to output variables. Output variables are power and longitudinal angles of each radiating diffraction order. Input variables would include the type of fiber used, grating pitch, grating tilt, and wavelength. With information gathered from the input-output analysis, we continue by studying blue light diffraction. Different devices are compared to gain insight into the optimal conditions for a blue light TFBG sensor. The diffraction of blue light in particular is exploited to gain insight on specialized fiber nano-coatings used in biochemical sensors. To start we review the existing methods of TFBG diffraction in the visible spectrum, including Coupled Mode analysis and a brief overview of alternate methods. Generally, depending on the wavelength and other factors there may or may not be coupling to radiation modes. The specific angles of these radiation modes with respect to the fiber axis, called longitudinal angles, are determined by theoretical phase-matching conditions related to the incoming beam wavelength. iii Acknowledgements My immediate thanks go to Dr. Jacques Albert and Dr. Christopher Smelser, my thesis supervisors, for their constant support, encouragement, and professional demeanour throughout my thesis research. You were both always ready to provide invaluable suggestions and to conduct productive discussions. Our lab technician, Albane Laronche was integral to the realization of this project. She was always available for troubleshooting and to help with laboratory equipment and procedures. Ultimately, your professionalism and insights were a major factor in the success of this research and your contribution is duly appreciated. A special thanks goes to Dr. Anatoli Ianoul, Daniel Prezgot and Adam Bottomley of Carleton University's Department of Chemistry for providing the workspace required for the completion of this project and helping me in ways I can only describe as selfless and adept. Similarly, I am infinitely grateful to Penka Matanska and Mike Antunes of the Physics Department for lending a Goniometer, which turned out to be the key to the success of this research. Finally, none of this work was possible without the Department of Electronics, from its Faculty to ...

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Fiber Gratings and Related Devices

Fang¹,

Chin²,

Qu³

et al. 2012

Fundamentals of Optical Fiber Sensors

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Influence of the longitudinal mode field in grating scattering from weakly guided optical fiber waveguides

Cited by 11 publications

References 8 publications

Ultrawide Bandwidth Wavelength Monitor Based on a Pair of Tilted Fiber Bragg Gratings

Ultrawide Bandwidth Wavelength Monitor Based on a Pair of Tilted Fiber Bragg Gratings

Experimental Investigation of Visible Diffraction in Tilted Fibre Bragg Gratings

Fiber Gratings and Related Devices

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