Tunable Fabry–Perot filter in cobalt doped fiber formed by optically heated fiber Bragg gratings pair

Liu, Ying; Zhou, Bin; Zhang, Liang; He, Sailing

doi:10.1016/j.optcom.2015.01.041

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…Fiber Bragg grating Fabry-Perot cavities (FBG-FPs) are desirable for narrow-band filters and higher accuracy wavelength measurement, due to the fact that the linewidth of their ultra-narrow resonance peaks in the stopband of the fiber Bragg grating (FBGs) could easily be reduced to several MHz. Hence FBG-FP is one of the most important fiber components for lasers and suppressing noise, [1][2][3][4][5] tunable filters, [6][7][8] wavelength division multiplexing, [9] and fiber sensing. [10][11][12] Wei et al designed an external cavity diode laser that realized a noise suppression of over 70 dB with the Fourier frequencies between 5 Hz and 1 kHz by an optical feedback ring based on FBG-FP cavity.…”

Section: Introductionmentioning

confidence: 99%

Influence of intra-cavity loss on transmission characteristics of fiber Bragg grating Fabry–Perot cavity

Wang

Ding

et al. 2018

Chinese Phys. B

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A theoretical model of the fiber Bragg grating Fabry-Perot (FBG-FP) transmission spectrum considering loss of FBG and intra-cavity fiber is presented. Several types of FBG-FPs are inscribed experimentally, and their spectra are measured. The results confirm that weak intra-cavity loss is enhanced at the resonance transmission peak, that is, loss of transmission peaks is observably larger than other wavelengths. For FBG-FPs with multi resonance peaks, when the resonance peak wavelength is closer to the Bragg wavelength, the more significant loss effect of resonance transmission peak is exhibited. The measured spectra are fitted with the presented theoretical model. The fitted coefficient of determinations are near 1, which proves the validity of the theoretical model. This study can be applied to measure FBG loss more accurately, without a reference light. It can play an important role in FBG and FBG-FP writing process optimization and application parameter optimization.

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Section: Introductionmentioning

confidence: 99%

Influence of intra-cavity loss on transmission characteristics of fiber Bragg grating Fabry–Perot cavity

Wang

Ding

et al. 2018

Chinese Phys. B

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“…Additionally, the use of nanocoatings combined with optical fiber can enhance the sensing properties and allow novel functionalities [4][5][6]. Many different optical fiber sensing structures based on nanostructured films such as long period gratings (LPGs) [7], interferometric cavities [8], fiber Bragg gratings (FBGs) [9,10], resonance-based sensors [11][12][13][14] or fluorescence-based sensors [15][16][17] have been developed recently, but those that use spectral techniques have shown a better performance because their measurements are more reliable and highly independent from optical power fluctuations. In this document, an optical fiber pH sensor based on the simultaneous generation of two different electromagnetic effects, lossy mode resonance (LMR) and localized surface plasmon resonance (LSPR), is presented.…”

Section: Introductionmentioning

confidence: 99%

Optical fiber pH sensor based on gold nanoparticles into polymeric coatings

et al. 2015

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A pH optical fiber sensor based on electromagnetic resonances generated in a waveguide-nanocoating interface is presented here. The incorporation of gold nanoparticles (AuNPs) into polymeric thin films has been deeply studied and the deposition of these thin-films onto an optical fiber core has been performed in order to obtain a resonance-based optical fiber device. The presence of both the metal nanoparticles and the polymers in the coating allows the generation of two different electromagnetic resonances: localized surface plasmon resonance (LSPR) and lossy mode resonance (LMR). These phenomena can be simultaneously observed in the transmitted spectrum. The resultant device has shown a high sensitivity to pH changes from pH 4.0 to pH 6.0, with a large dynamical range and a very fast response

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Suppressing Side‐Scattering on Laser‐Written Bragg Gratings for Back‐Reflection Engineering in Fibers

Hu,

Wang,

Lau

et al. 2024

Laser & Photonics Reviews

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Laser direct writing (LDW) is versatile in structuring fibers with micro‐sized functional elements such as fiber Bragg grating (FBG) and backscattering centers by finely manipulating back and side scattering from laser‐induced refractive index modified (RIM) points. However, the side‐scattering is a lesser‐explored property in laser‐structured fibers. In this work, a concise physical model is established to understand the side‐scattering as a combined effect of microstructure and geometry of RIM points. Based on a single‐pulsed LDW method, the parametric decoupling between scattering loss (α) and coupling strength (κ) coefficients of FBGs is reported, whose cross‐section is customized to have a flattened ellipse with thoroughly positive RIM, enabling controllable reflectivity from −21.33 dB to −0.0018 dB while maintaining narrow bandwidth and low loss. Exemplarily, a designed FBG realizes ultra‐low loss of 0.008 dB with a resonance attenuation of 10.81 dB, exhibiting a record‐breaking κ/α of 2083. Using this FBG as the high‐reflective mirror of a home‐made bismuth‐doped fiber laser, narrow‐band lasing with a high optical signal‐to‐noise ratio of ≈43 dB is achieved, demonstrating flexibilities of the proposed approach in customizing both back‐ and side‐scattering in fibers and opening up wide opportunities for combining multifunctional components into optical fibers and realizing all‐fiber networks.

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Tunable Fabry–Perot filter in cobalt doped fiber formed by optically heated fiber Bragg gratings pair

Cited by 12 publications

References 21 publications

Influence of intra-cavity loss on transmission characteristics of fiber Bragg grating Fabry–Perot cavity

Influence of intra-cavity loss on transmission characteristics of fiber Bragg grating Fabry–Perot cavity

Optical fiber pH sensor based on gold nanoparticles into polymeric coatings

Suppressing Side‐Scattering on Laser‐Written Bragg Gratings for Back‐Reflection Engineering in Fibers

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