Novel fabrication technique for phase-shifted fiber Bragg gratings using a variable-velocity scanning beam and a shielded phase mask

Zhou, Jiangtao; Guo, Kuikui; He, Jun; Hou, Maoxiang; Zhang, Zhe; Liao, Changrui; Wang, Ying; Xu, Gaixia; Wang, Yiping

doi:10.1364/oe.26.013311

Cited by 22 publications

(5 citation statements)

References 25 publications

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“…We find the following properties of the matrices: Σ 0 (φ)•Σ 0 (−φ) = I, Σ 1 (φ)•Σ 1 (−φ) = I, Σ 2 (φ) 2 = I, Σ 3 (φ) 2 = I where I is the 4 × 4 identity matrix in unidirectional space which corresponds to the light being entirely transmitted from each end of both waveguides to the other end. The first two relations predict that a standard Bragg grating with a π phase shift in the center transmits resonant light, as expected for a phase-shift grating Fabry-Perot resonator [30], [31], [32]. The final two relations follow from Eq.…”

Section: Fundamental Transformation Matricesmentioning

confidence: 71%

4-by-4 Integrated Waveguide Coupler Based on Bi-Directional Propagation in Two Single-Mode Waveguides

et al. 2021

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We propose and investigate theoretically the use of bi-directional propagation of light in silica integrated coupled waveguide structures for linear optical processing of fiber-coupled photons. We show that the class of linear operations that can be implemented in such a system is given by symmetric and unitary matrices. We present how an arbitrary 4×4 coupler of this form can be realized by a linear sequence of more fundamental 2 × 2 couplers and single-waveguide phase shifters and discuss in detail the implementation in a silica integrated platform utilizing direct UV-written waveguides and long-and short-period grating couplers with tilted gratings for optimized coupling efficiency.

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Section: Fundamental Transformation Matricesmentioning

confidence: 71%

4-by-4 Integrated Waveguide Coupler Based on Bi-Directional Propagation in Two Single-Mode Waveguides

et al. 2021

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“…The resulting center wavelength of CFBG is ~1550 nm, according to the grating equation

, and the reflection bandwidth of the CFBG is proportional to scanning length L . The scanning setup for CFBG fabrication is sketched in Figure 2 a, which is similar to [ 20 ]. A CFBG (CFBG 1 ) is first inscribed in a hydrogen-load single-mode fiber (SMF-28).…”

Section: Sensor Fabricationmentioning

confidence: 99%

High-Resolution and Large-Dynamic Range Fiber-Optic Sensors Based on Dual-Mode Direct Spectrum Interrogation Method

Zhou,

Zhang,

Cui

et al. 2024

Sensors

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Conventional optical fiber temperature/strain sensors often have to make compromises between the resolution and the dynamic range. Here we present a new method that meets the measurement requirements for both high resolution and large dynamic range. A high-quality optical fiber Fabry-Perot Interferometer (FPI) constructed using a pair of chirped fiber Bragg gratings is employed as the sensor and a dual-mode direct spectrum interrogation method is proposed to identify the small drift of external temperature or strain. As a proof-of-concept illustration, a temperature resolution of 0.2 °C within 30–130 °C is demonstrated. For strain sensing, the resolution can be 10 µε within 0–1000 µε. The measurement resolution can be improved further by routinely increasing the reflectivity of the CFBG and the cavity length and the sensor can also be mass-produced. This new sensing schema not only resolves the conflict between the resolution and the dynamic range of fiber-optic temperature/strain sensors but can also be extended to other sensors and measurands.

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“…The EDF was loaded with hydrogen (80 °C and 13 MPa for 7 days) to increase the fiber photosensitivity. The experimental setup used for fabricating PS-FBGs was similar to that presented in our previous works [21,22]. The optical spectra of the PS-FBG with a central wavelength of 1550.9 nm and transmission loss of 33.5 dB were measured using an optical spectrum analyzer, as shown in Fig.…”

Section: A Fabrication Of the Dfb Fiber Lasermentioning

confidence: 99%

Dual-Polarization Distributed Feedback Fiber Laser Sensor Based on Femtosecond Laser-Inscribed In-Fiber Stressors for Simultaneous Strain and Temperature Measurements

Guo

et al. 2020

IEEE Access

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We propose and experimentally demonstrate a novel dual-polarization distributed feedback fiber laser (DFB-FL) sensor based on femtosecond laser-inscribed in-fiber stressors. The resonant cavity of the DFB-FL sensor consists of a phase-shifted fiber Bragg grating (PS-FBG) in the fiber core of a section of heavily erbium-doped fiber (EDF), together with two stressors in the fiber cladding around the PS-FBG. The PS-FBG was fabricated by means of a scanning UV laser beam and shielded phase mask technique. The two in-fiber stressors, i.e. a sawtooth stressor and a straight stressor, were directly inscribed at two orthogonal planes in the EDF cladding using a near-infrared femtosecond laser. The two stressors could precisely adjust the fiber birefringence in the laser cavity, and hence the DFB-FL sensor can operate in two polarization modes. Moreover, simultaneous measurement of axial strain and temperature was demonstrated by detecting the polarization beat frequency νB and lasing wavelength λ of the dualpolarization DFB-FL sensor. Experimental results exhibit strain sensitivities of 34.5 kHz/µε, 1.25 pm/µε and temperature sensitivities of 684.6 kHz/°C, 11.5 pm/°C, respectively. As such, the proposed dualpolarization DFB-FL sensor could be used for simultaneous strain and temperature measurements, and hence is promising for application in many areas, such as smart structures and intelligent robotics.

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Novel fabrication technique for phase-shifted fiber Bragg gratings using a variable-velocity scanning beam and a shielded phase mask

Cited by 22 publications

References 25 publications

4-by-4 Integrated Waveguide Coupler Based on Bi-Directional Propagation in Two Single-Mode Waveguides

4-by-4 Integrated Waveguide Coupler Based on Bi-Directional Propagation in Two Single-Mode Waveguides

High-Resolution and Large-Dynamic Range Fiber-Optic Sensors Based on Dual-Mode Direct Spectrum Interrogation Method

Dual-Polarization Distributed Feedback Fiber Laser Sensor Based on Femtosecond Laser-Inscribed In-Fiber Stressors for Simultaneous Strain and Temperature Measurements

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