Theoretical and experimental analysis of excessively tilted fiber gratings

Yan, Zhijun; Wang, Hushan; Wang, Changle; Sun, Zhongyuan; Yin, Guolu; Zhou, Kaiming; Wang, Yishan; Zhao, Wei; Zhang, Lin

doi:10.1364/oe.24.012107

Cited by 68 publications

(44 citation statements)

References 29 publications

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“…As shown in Fig. 2(c), with the resonant wavelength increase, the separation linearly increases, indicating wavelength dependent feature, which can be explained by the increasing effective index difference between the TM and TE modes [18]. The tuning characteristics of polarization of the Ex-TFG cladding modes with SRI variation were experimentally examined by using a series of refractive index liquids (from Cargille Labs) ranging from 1.300 to 1.400 with interval of 0.01.…”

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confidence: 88%

“…By examining the spectral evolution under different polarizations, it was found that the TE light from the cladding modes of all orders is more coupled into graphene layer, which attests to polarization-sensitive absorption of graphene for all leaky modes [3,4]. It is apparent that the change of coupling intensity of TE polarization is always larger than that of TM for all cladding modes [18], as shown in Fig. 2(b).…”

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confidence: 92%

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Graphene-induced unique polarization tuning properties of excessively tilted fiber grating

et al. 2016

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By exploiting the polarization-sensitive coupling effect of graphene with the optical mode, we investigate the polarization modulation properties of a hybrid waveguide of graphene-integrated excessively tilted fiber grating (Ex-TFG). The theoretical analysis and experimental results demonstrate that the real and imaginary parts of complex refractive index of few-layer graphene exhibit different effects on transverse electric (TE) and transverse magnetic (TM) cladding modes of the Ex-TFG, enabling stronger absorption in TE mode and more wavelength shift in TM mode. Furthermore, the surrounding refractive index can modulate the complex optical constant of graphene and then the polarization properties of the hybrid waveguide, such as resonant wavelength and peak intensity. Therefore, the unique polarization tuning property induced by the integration of graphene layer with Ex-TFG may endow potential applications in all-in fiber modulator, fiber laser and biochemical sensor.

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confidence: 88%

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confidence: 92%

Graphene-induced unique polarization tuning properties of excessively tilted fiber grating

et al. 2016

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“…This feature makes small-angle TFGs an excellent candidate for sensing applications [24]. On the other hand, in excessively tilted fiber gratings (Ex-TFGs) [25], the fiber core mode can be coupled into forward propagating cladding modes. Due to birefringent mode coupling, Ex-TFGs have been applied in refractive index sensing with extremely low thermal cross sensitivity [26].…”

Section: Principlementioning

confidence: 99%

Highly Efficient Optical Beam Steering Using an In-Fiber Diffraction Grating for Full Duplex Indoor Optical Wireless Communication

Wang

Habib

Yan

et al. 2018

J. Lightwave Technol.

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Abstract-Diffraction gratings have been widely used in wavelength-controlled non-mechanical laser beam steering for high data-rate indoor optical wireless communications (OWC). Existing free-space diffraction gratings suffer from inherent difficulties of limited diffraction efficiency, bulky configuration, high cost and significant coupling loss with optical fiber links. In this work, a new optical approach for highly efficient, compact and fiber compatible laser beam steering using an in-fiber diffraction grating is proposed and experimentally demonstrated for the first time to our best knowledge. In-fiber diffraction is made possible based on a 45° tilted fiber grating (TFG), where wavelength dependent lateral scattering is obtained due to the strongly tilted grating structure. Improved diffraction efficiency of 93.5% has been achieved. In addition, the 45° TFG works perfectly for both light emission and reception, enabling full-duplex optical wireless transmission. Utility of the 45° TFG in all-fiber laser beam steering for multi-user full duplex optical wireless communications has been verified in experiments. 1.4 m free-space full-duplex wireless transmission has been demonstrated with data rate up to 12 Gb/s per beam using 2.4 GHz bandwidth OFDM signals.

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“…Usually, tilt angles of the fabricated Ex-TFGs were from 79° to 83°. The surrounding refractive index (RI) sensitivity of the sensor is affected by a tilt angle increase, but the influence is low in this range [22]. In order to guarantee the claddingmode resonance to appear in the ~1550 nm wavelength range, 81° tilt angle was selected.…”

Section: Fabrication Of Ex-tfgs and Apparatusmentioning

confidence: 99%

Human heart failure biomarker immunosensor based on excessively tilted fiber gratings

Luo¹,

Wu²,

Zhang³

et al. 2016

Biomed. Opt. Express

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Abstract:A label-free immunosensor platform based on excessively tilted fiber gratings (ExTFGs) was developed for highly specific and fast detection of human N-terminal pro-B-type natriuretic peptide (NT-proBNP), which is considered a powerful biomarker for prognosis and risk stratification of heart failure (HF). High-purity anti-NT-proBNP monoclonal antibodies (MAbs) prepared in our laboratory were immobilized on fiber surface through the staphylococcal protein A (SPA) method for subsequent specific binding of the targeted NTproBNP. Utilizing fiber optic grating demodulation system (FOGDS), immunoassays were carried out in vitro by monitoring the resonance wavelength shift of Ex-TFG biosensor with immobilized anti-NT-proBNP MAbs. Lowest detectable concentration of ~0.5ng/mL for NTproBNP was obtained, and average sensitivity for NT-proBNP at a concentration range of 0~1.0 ng/mL was approximately 45.967 pm/(ng/mL). Several human serum samples were assessed by the proposed Ex-TFG biomarker sensor, with high specificity for NT-proBNP, indicating potential application in early diagnosing patients with acute HF symptoms. , 3023-3027 (2015).

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Theoretical and experimental analysis of excessively tilted fiber gratings

Cited by 68 publications

References 29 publications

Graphene-induced unique polarization tuning properties of excessively tilted fiber grating

Graphene-induced unique polarization tuning properties of excessively tilted fiber grating

Highly Efficient Optical Beam Steering Using an In-Fiber Diffraction Grating for Full Duplex Indoor Optical Wireless Communication

Human heart failure biomarker immunosensor based on excessively tilted fiber gratings

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