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Low-cost fiber-tip Fabry-Perot interferometer and its application for high temperature sensing

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Chinese Optics Letters 2014年第A1期12卷 47-49页

作者：姜小刚陈达如邵杰冯高峰扬军勇 Institute of Information Optics Zhejiang Normal University Jinhua 321004 China Joint Research Laboratoiy of Optics of Zhejiang Normal University and Zhejiang University Hangzhou 310058 China Futong Group Co. Ltd Fbyang 311004 China

We propose, fabricate, and demonstrate a compact fiber-tip Fabry-Perot interferometer of microcavity for high-temperature sensing. The microcavity which can be used for temperature or pressure sensing is fabricated by using arc discharge at the end of a multimode fiber, which is processed with chemical etching. Advantages of the sensor based on the fiber-tip Fabry-Perot interferometer are small size, easy fabrication, low cost and may have potential applications in space-limited and high-temperature environment.

关键词： 060.2280 Fiber design and fabrication 060.2310 Fiber optics 060.2370 Fiber optics sensors

Theoretical analysis of temperature sensor based on dual-core fiber

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Chinese Optics Letters 2012年第B6期10卷 19-22页

作者：陈达如胡顾锋彭保进吴根柱谭华耀 Institute of Information Optics Zhejiang Normal University Jinhua 321001 China photonics Research Centre Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR China

A novel temperature sensor based on a dual-core fiber （DCF） is proposed and theoretically analyzed. The DCF-based temperature sensor is simply formed by splicing a segment of DCF to two segments of single mode fibers, where the DCF is used as the sensing element. The mode coupling between two fiber cores of the DCF is sensitive to the temperature-induced index change of the silica in the DCF. Simulations show that there is a linear relationship between the temperature of the DCF and the wavelength shift of the output spectrum of the DCF-based temperature core of the DCF. Temperature sensors based on are also investigated. sensor when the broadband light is injected into one fiber DCFs with different parameters for temperature sensing

关键词： 060.2310 Fiber optics 060.2280 Fiber design and fabrication 060.2370 Fiber optics sensors

Rotation function development of four-core fiber optic tweezers

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Chinese Optics Letters 2014年第A2期12卷 17-19页

作者：高上苑立波 Key Laboratory of In-Fiber Integrated Optics Ministry of Education College of Science Harbin Engineering University Harbin 150001 China

We demonstrate a new four-core fiber optic tweezers by polishing the end face of a four-core fiber into a truncated pyramid that is asymmetric to fiber cores. Optical intensity propagation and distribution are modeled numerically, and rotation function is developed by means of calculating three-dimensional trapping force and torque in ray optics regime. Simulation results show our tweezers is a feasible approach that can trap and rotate microscopic spheroid objects stably.

关键词： 350.4855 Optical tweezers or optical manipulation 060.2310 Fiber optics

Piezoelectric strain coefficient measurement based on elasto-optic effect of fiber

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Chinese Optics Letters 2014年第A2期12卷 20-21页

作者：秦涛李政勇吴重庆王智 Key Laboratory of Luminescence and Optical Information of Ministry of Education and Institute of Optical Information Beijing Jiaotong University Beijing 100044 China

Based on elasto-optic effect theory, we present a simplified model for the fiber squeezer assisted with a piezoceramic actuator （PZT）, and it is experimentally demonstrated with reasonable approximation. Results show that there is a quadratic polynomial relationship between the arccosine reciprocal value of light intensity outputted from polarization analyzer and the reciprocal value of applied voltage for the PZT. Using this formula, the key parameters of the PZT such as the piezoelectric strain coefficient are further obtained. Our conclusions are significant for accurate measurement and polarization control.

关键词： 060.2310 Fiber optics 260.1440 Birefringence 260.5430 Polarization

Beam cleanup of the stimulated Raman scattering in grade-index multi-mode fiber

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Chinese Optics Letters 2014年第A2期12卷 55-58页

作者：王文亮黄良金冷进勇郭少锋姜宗福 College of Optoelectric Science and Engineering National University of Defense Technology Changsha 410073 China

In order to study the beam cleanup effect of the stimulated Raman scattering （SRS） in the graded-index multi-mode fiber （GIMF）, a continuous wave all-fiber laser at 1117.8 nm and a pulsed fiber amplifier at 1064 nm are built up as the seed and pump source in the Raman fiber amplifier （RFA）. In unseeded SRS process, a pump beam with M^2x = 6.7 and M^2 = 6.7 is transferred into a Stokes beam with M^2x = 1.5 and M^2 = 1.7 in y y the multi-mode fiber with a 62.5 μm graded-index core （numerical aperture =0.29）. In the RFA, a seed light with M^2y = 6.7 and M^2y = 7.3 is amplified to a signal light with M^2x = 1.8 and M^2y = 2.0. The experimental y y results are explained by the simulation on the mode evolution during SRS procession and Raman amplification in the GIMF. The results show that both the SRS and Raman amplification effect in the GIMF have beam cleanup effect.

关键词： 060.2310 Fiber optics 060.4370 Nonlinear optics, fibers 190.5650 Raman effect