Nonlinearity-Compensation-Free Optical Frequency Domain Reflectometry Based on Electrically-Controlled Optical Frequency Sweep |
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| Authors: | Fan Yang Ling-Jie Zhang Zhi-Yao Zhang Xiao-Jun Zhou Yong Liu |
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| Affiliation: | School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China |
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| Abstract: | A nonlinearity-compensation-free optical frequency domain reflectometry (OFDR) scheme is proposed and experimentally demonstrated based on the electrically-controlled optical frequency sweep. In the proposed scheme, the linear frequency sweep light is generated by propagating an ultra-narrow-linewidth continuous-wave (CW) light through an electro-optic frequency shifter which consists of a dual-parallel Mach-Zehnder modulator (DPMZM) and an electronic 90° hybrid, where the electro-optic frequency shifter is driven by a linear frequency modulated signal generated by a direct digital synthesizer (DDS). Experimental results show that the spatial resolution and signal-to-noise ratio (SNR) of the proposed OFDR scheme without the nonlinear phase compensation are comparable to those of OFDR employing a commercial tunable laser source (TLS), an auxiliary interferometer, and a software-based nonlinear phase compensation method. The proposed OFDR scheme is helpful to reduce the complexity of the optical structure and eliminate the difficulty of developing the nonlinear phase compensation algorithm. |
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| Keywords: | Dual-parallel Mach-Zehnder modulator (DPMZM) electro-optic frequency shifter optical fiber sensor optical frequency domain reflectometry (OFDR) |
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