A quantitative analysis of the performance of an all-fiber electronically tunable wavelength filter using a four-layer model

J. E. Lee; Q. Chen; S. Yin; M. R. Lin; Q. Zhang; K. M. Reichard; D. H. Ditto; J. Mazurowksi; M. Hackert

doi:10.1117/12.680087

24 August 2006 A quantitative analysis of the performance of an all-fiber electronically tunable wavelength filter using a four-layer model

J. E. Lee, Q. Chen, S. Yin, M. R. Lin, Q. Zhang, K. M. Reichard, D. H. Ditto, J. Mazurowksi, M. Hackert

Author Affiliations +

Proceedings Volume 6314, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII; 63141G (2006) https://doi.org/10.1117/12.680087
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

In this work, an investigation of the tuning characteristics of electrically tunable long-period gratings (LPGs) is presented. A precise four-layer model is used to quantitatively analyze the tuning potential of the gratings and experimental data is provided to support the analysis. The four-layer model includes a silica core layer with an inscribed LPG, a thin silica cladding layer (~40 μm), an ultra-thin (~ 50 nm) high refractive index indium-tin dioxide (ITO) inner electrode layer, and a tunable electro-optic polymer layer. It has been found that the inner electrode layer, made of high refractive index ITO, can be modeled as a high index overlay and causes the forward propagating modes in the thin silica cladding to reorganize as the ambient refractive index changes. This reorganization effect can lead to a significant increase (10 plus fold) in the tuning range of LPG tunable filters. Moreover, the required specifications of the tunable polymer layer are quantitatively analyzed. Finally, the required characteristics of the electro-optic polymer are realized by using a nano-composite of zinc sulfide and ferroelectric relaxor poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer.

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J. E. Lee, Q. Chen, S. Yin, M. R. Lin, Q. Zhang, K. M. Reichard, D. H. Ditto, J. Mazurowksi, and M. Hackert "A quantitative analysis of the performance of an all-fiber electronically tunable wavelength filter using a four-layer model", Proc. SPIE 6314, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XII, 63141G (24 August 2006); https://doi.org/10.1117/12.680087

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KEYWORDS

Refractive index

Cladding

Polymers

Photorefractive polymers

Silica

Electro optical modeling

Tunable filters

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