Critical Wavelength in the Transmission Spectrum of SMS Fiber Structure Employing GeO$_{2}$-Doped Multimode Fiber

Tripathi, Saurabh Mani; Kumar, Arun; Marin, Emmanuel; Meunier, Jean-Pierre

doi:10.1109/lpt.2010.2046155

Cited by 33 publications

(22 citation statements)

References 12 publications

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“…Recently the existence of a critical wavelength has been predicted and subsequently demonstrated in the transmission spectrum of fiber-optic single-multi-mode structures [1][2][3]. The critical wavelength has two distinct properties (i) the spectral shift of transmission spectrum is of opposite nature on either side of the critical wavelength, and (ii) sensitivity is highest for transmission maximum/minimum nearest to the critical wavelength.…”

Section: Introductionmentioning

confidence: 99%

<br /> Critical Wavelength in the Transmission Spectrum of a Directional Coupler Employing GeO_2-doped Single Mode Fibers

Bawa

Tripathi

2016

13th International Conference on Fiber Optics and Photonics

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Abstract:We examine the existence of critical wavelength in transmission spectrum of a Directional Coupler, employing GeO 2 doped SMF and show that it differs significantly from that observed in SMS structures. Origin of critical-wavelength is also explained. IntroductionRecently the existence of a critical wavelength has been predicted and subsequently demonstrated in the transmission spectrum of fiber-optic single-multi-mode structures [1][2][3]. The critical wavelength has two distinct properties (i) the spectral shift of transmission spectrum is of opposite nature on either side of the critical wavelength, and (ii) sensitivity is highest for transmission maximum/minimum nearest to the critical wavelength. Since the critical wavelength has been demonstrated to exist due to the modal interference of various modes in GeO 2 doped MMF, motivated by such finding we examine the existence of any such wavelength in directional coupler (DC) which is essentially based upon modal interference among the super modes of two single mode waveguides constituting the directional coupler. In this paper we show that the directional coupler indeed supports the critical wavelength but the nature of the transmission spectrum is slightly different from the one observed for SMS structure. In addition with the opposite spectral shift of the transmission spectrum observed among the critical wavelength for SMS structure [1-3], we show that for a DC there exists a wavelength smaller than the critical wavelength below which the spectrum again changes its nature of spectral shift. However, in agreement with the critical wavelength of SMS structure the sensitivity has been observed to be maximum for the transmission maximum or minimum nearest to the critical wavelength.

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Section: Introductionmentioning

confidence: 99%

<br /> Critical Wavelength in the Transmission Spectrum of a Directional Coupler Employing GeO_2-doped Single Mode Fibers

Bawa

Tripathi

2016

13th International Conference on Fiber Optics and Photonics

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“…Instead of applying Eq. (1) to obtain the sensor spectrum, a more accurate model employs analysis of modal coupling and propagation in the multimode waveguide [18][19][20][21]. Light in the SMF is carried by the LP 01 mode of the SMF with normalized mode profile Φ 0 .…”

Section: A Exact Field Expressionmentioning

confidence: 99%

Multimode excitation-induced phase shifts in intrinsic Fabry–Perot interferometric fiber sensor spectra

Wang

2010

Appl. Opt.

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We report the modal analysis of optical fiber single-mode-multimode-single-mode intrinsic Fabry-Perot interferometer sensors. The multimode nature of the Fabry-Perot cavity gives rise to an additional phase term in the spectrogram due to intermodal dispersion-induced wavefront distortion, which could significantly affect the cavity length demodulation accuracy. By using an exact model to analyze the modal behavior, this phase term is explained by employing a rotating vector approach. Comparison of the theoretical analysis with experimental results is presented.

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“…These, so called SMS fiber structures have been extensively used for various applications such as sensors [1][2][3], optical beam shaper [4], optical switches, directional couplers [5], band pass/stop filters [6,7], and fiber lenses [8] etc. Some of these devices, such as temperature sensors, require high temperature sensitivity while others require zero or low temperature sensitivity.…”

Section: Introductionmentioning

confidence: 99%

A comparison of temperature sensing characteristics of SMS structures using step and graded index multimode fibers

Kumar¹,

Kumar²,

Tripathi³

2014

Optics Communications

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Critical Wavelength in the Transmission Spectrum of SMS Fiber Structure Employing GeO$_{2}$-Doped Multimode Fiber

Cited by 33 publications

References 12 publications

<br /> Critical Wavelength in the Transmission Spectrum of a Directional Coupler Employing GeO_2-doped Single Mode Fibers

<br /> Critical Wavelength in the Transmission Spectrum of a Directional Coupler Employing GeO_2-doped Single Mode Fibers

Multimode excitation-induced phase shifts in intrinsic Fabry–Perot interferometric fiber sensor spectra

A comparison of temperature sensing characteristics of SMS structures using step and graded index multimode fibers

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