The Method of Determining Stress Levels Regarding the Electrical ALT through Optical Temperature Sensor

Ryu, Haeng-Soo; Han, Gyu-Hwan; Yoon, N. S.

doi:10.5370/jeet.2008.3.2.184

Cited by 12 publications

(5 citation statements)

References 4 publications

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“…[9][10][11][12] In particular, the spectral characteristics of LPFGs are so sensitive to various physical parameters such as strain, temperature, bending, and external refractive index that they have been attractive candidates for optical sensing applications. [13][14][15][16] Among physical measurands mentioned above, the temperature response of LPFGs has been extensively studied. Usually, LPFGs fabricated in standard single-mode fiber (SMF) show a temperature sensitivity of $100 pm/K, 13) which is an order of magnitude higher than that of fiber Bragg gratings (FBGs).…”

Section: Introductionmentioning

confidence: 99%

Highly-Sensitive and -Linear Cryogenic Temperature Response of Long-Period Fiber Gratings Written on B–Ge-Codoped Photosensitive Fiber

Choi

Kim

Roh

et al. 2012

Jpn. J. Appl. Phys.

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The operation of a leaky zirconia oxygen pump-gauge is discussed in which the pump was driven so as to generate a sinusoidal EMF at the gauge of predetermined frequency and amplitude. A theoretical equation for the current is derived and checked for conformance with sensor characteristics. In general there was good agreement with theory; there was some discrepancy with variation in total gas pressure. It is shown that the output current lo at zero gauge EMF was independent of the degree of leakage while the current I, at the gauge EMF maximum was directly proportional to the degree of leakage, so providing a direct and independent measure of leakage with aging.

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Section: Introductionmentioning

confidence: 99%

Highly-Sensitive and -Linear Cryogenic Temperature Response of Long-Period Fiber Gratings Written on B–Ge-Codoped Photosensitive Fiber

Choi

Kim

Roh

et al. 2012

Jpn. J. Appl. Phys.

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“…The proposed approach has high potential for applications such as microwave transversal filters, optical switches, and optical sensors. [20][21][22][23]…”

Section: Discussionmentioning

confidence: 99%

Current-Controlled Tunable Fiber Multiwavelength Filter Based on Polarization-Diversity Loop Structure

Choi

Lee

2011

Jpn. J. Appl. Phys.

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In this paper we have demonstrated absolute wavelength tuning in an optical fiber multiwavelength filter based on a polarization-diversity loop structure by controlling electrical currents injected into enameled wires wound on polarization-maintaining fibers (PMFs), that is, adjusting Joule heat generated from current-flowing enameled wires. The proposed filter consists of a four-port polarization beam splitter, a half-wave plate, a quarter-wave plate, and PMFs. The wavelength shifts of spectral dips in the transmission spectra of the fabricated filter were investigated with the variation of the injection current. The absolute wavelength of the filter could be controlled in proportion to the square of the injection current with considerably good linearity, and the wavelength tuning sensitivity was evaluated as ∼83.5 nm/A2 with respect to the injection current.

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“…Fiber Bragg gratings (FBGs) with narrowband waveguide characteristics have a number of advantages such as compactness, ease of fabrication, and low polarization sensitivity and insertion loss (IL) [1][2][3]. They have been extensively used as optical cavity filters in fiber lasers [4], wavelengthselective elements for wavelength division multiplexing (WDM) equipment such as optical add/drop multiplexers [5] and cross-connects [6], sensor heads for optical sensors [7][8][9], and microwave photonic filters [10]. Generally, the transmission spectrum of an FBG, which shows the narrowbandstop filtering property, can be measured through its direct serial connection with a light source and an optical spectrum analyzer (OSA), but an additional optical component such as an optical coupler or circulator is required for exploiting its bandpass filtering feature, i.e., obtaining its reflection spectrum.…”

Section: Introductionmentioning

confidence: 99%

Inline selection of transmission or reflection spectra of different fiber Bragg gratings using polarization-diversity loop

Kim

Kang

Nam

et al. 2015

J. Opt.

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We show the inline selection of transmission or reflection spectrum of one of two fiber Bragg gratings (FBGs) with different Bragg wavelengths by incorporating a polarization-diversity loop without reconfiguring the filter structure. The proposed filtering apparatus consists of a fiber-pigtailed polarization beam splitter, two FBGs, and three quarter-wave plates (QWPs). Without optical switches and couplers, the proposed filter can flexibly choose the transmission or reflection spectrum of each FBG through proper control of the QWPs contained in the filter. The fabricated filter shows an average insertion loss of ∼4.43 dB, average band rejection ratio of ∼17.92 dB, and average side-mode suppression ratio of ∼19.73 dB.

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The Method of Determining Stress Levels Regarding the Electrical ALT through Optical Temperature Sensor

Cited by 12 publications

References 4 publications

Highly-Sensitive and -Linear Cryogenic Temperature Response of Long-Period Fiber Gratings Written on B–Ge-Codoped Photosensitive Fiber

Highly-Sensitive and -Linear Cryogenic Temperature Response of Long-Period Fiber Gratings Written on B–Ge-Codoped Photosensitive Fiber

Current-Controlled Tunable Fiber Multiwavelength Filter Based on Polarization-Diversity Loop Structure

Inline selection of transmission or reflection spectra of different fiber Bragg gratings using polarization-diversity loop

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