Static and tunable dispersion management with higher order mode fibers

Ramachandran, Siddharth; Yan, M. F.

doi:10.1007/s10297-006-0070-8

Cited by 4 publications

(3 citation statements)

References 61 publications

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“…(5), hence minimizing coupling. Early dispersion compensation efforts [60,61] involved "W" fiber designs that separated the n eff of the desired LP 0,2 mode from the LP 2,1 and LP 1,2 modes (Δn eff denoted as red arrows in Figure 3) by Δn eff > 10 −3 . Simple step index fibers have a naturally mode-separating feature, where Δn eff between a desired LP 0,m and the undesired LP 1,m or LP 1,m−1 modes monotonically increases with radial order m [36] (green arrows in Figure 3).…”

Section: Fiber Perturbationsmentioning

confidence: 99%

Propagation stability in optical fibers: role of path memory and angular momentum

Ramachandran

2020

Nanophotonics

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With growing interest in the spatial dimension of light, multimode fibers, which support eigenmodes with unique spatial and polarization attributes, have experienced resurgent attention. Exploiting this spatial diversity often requires robust modes during propagation, which, in realistic fibers, experience perturbations such as bends and path redirections. By isolating the effects of different perturbations an optical fiber experiences, we study the fundamental characteristics that distinguish the propagation stability of different spatial modes. Fiber perturbations can be cast in terms of the angular momentum they impart on light. Hence, the angular momentum content of eigenmodes (including their polarization states) plays a crucial role in how different modes are affected by fiber perturbations. We show that, accounting for common fiber-deployment conditions, including the more subtle effect of light’s path memory arising from geometric Pancharatnam–Berry phases, circularly polarized orbital angular momentum modes are the most stable eigenbasis for light propagation in suitably designed fibers. Aided by this stability, we show a controllable, wavelength-agnostic means of tailoring light’s phase due to its geometric phase arising from path memory effects. We expect that these findings will help inform the optimal modal basis to use in the variety of applications that envisage using higher-order modes of optical fibers.

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Section: Fiber Perturbationsmentioning

confidence: 99%

Propagation stability in optical fibers: role of path memory and angular momentum

Ramachandran

2020

Nanophotonics

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“…[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%

“…Many researchers have been involved with the progress to date of our understanding of visible light diffraction behaviour in fibre optics. Within the theoretical sphere, several useful methods called Volume Current Method 9-13 , Coupled Mode Analysis 9, [14][15] , and a Free Space Model [16][17] are used interchangeably since either one has pros and cons. Volume Current Method (VCM) is an analytic approach to calculate the radiation pattern of tilted fiber gratings.…”

Section: Visible Diffraction Efficiencies In Tilted Fibre Bragg Gratingsmentioning

confidence: 99%

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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Design of ultra large negative dispersion PCF with selectively tunable liquid infiltration for dispersion compensation

Maji

Chaudhuri

2014

Optics Communications

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Static and tunable dispersion management with higher order mode fibers

Cited by 4 publications

References 61 publications

Propagation stability in optical fibers: role of path memory and angular momentum

Propagation stability in optical fibers: role of path memory and angular momentum

Experimental Investigation of Visible Diffraction in Tilted Fibre Bragg Gratings

Design of ultra large negative dispersion PCF with selectively tunable liquid infiltration for dispersion compensation

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