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With the rapid development of integrated photonics, expensive and bulky commercial spectrometers force people to make more efforts to investigate high-performance, integrated and low-cost spectrometers. Spectrometers benefiting from the complementary metal-oxide semiconductor (CMOS) technology have greatly enriched the applications of spectrum detection while devices based on optical fibers still have potential development room. Owing to the strong dependence of multimode interference on wavelength generated in a multimode fiber, probe signals of arbitrary spectra could be detected by a detector array integrated on the top and reconstructed by using a compressive sensing (CS) algorithm. The CS algorithm has been widely used in signal processing, which saves more computing storage and time but maintains the same precision. With the interference pattern system, our spectrometer based on a fiber taper achieves a spectral resolution of 20 pm (one order of magnitude better than commercial spectrometers) and a detection bandwidth of more than 200 nm on a device length of 1 mm. After optimizing the energy function, the spectral reconstruction results show excellent detection capability and metamerism effect superior to RGB cameras or human eyes, providing a significant role for portable multi-functional on-chip systems in future.
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Keywords:
- multimode fiber /
- spectrometer /
- compressive sensing
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图 1 (a)基于多模光纤的光谱探测系统示意图; (b)不同波长下得到的模式干涉图案
Fig. 1. (a) The structural diagram of spectroscopy detection based on the multimode fiber; (b) the multimode interference patterns at different wavelengths.
图 2 基于多模光纤光谱计的光谱探测原理
Fig. 2. The detecting principle of the spectrometer based on a multimode fiber.
图 3 (a)两条分立窄带信号的重建光谱, 证明该光谱计分辨率为20 pm; (b)重建误差与噪声阈值的函数关系
Fig. 3. (a) The reconstruction of two narrow lines, indicating the resolution is 20 pm; (b) The reconstruction error as a function of noise threshold.
图 4 (a)和(b)不同宽谱LED光源组合情况下, 该光纤光谱计的光谱重建结果
Fig. 4. (a) and (b) are spectral reconstructions of the fiber-based spectrometer under different LED-source combinations.
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[1] 张彤, 张维光, 蔡亚君, 胡晓鸿, 冯野, 王屹山, 于佳 2019 物理学报 68 234204
Google Scholar
Zhang T, Zhang W G, Cai Y J, Hu X H, Feng Y, Wang Y S, Yu J 2019 Acta Phys. Sin. 68 234204
Google Scholar
[2] 孙剑, 李唐军, 王目光, 贾楠, 石彦超, 王春灿, 冯素春 2019 物理学报 68 114210
Google Scholar
Sun J, Li T J, Wang M G, Jia N, Shi Y C, Wang C C, Feng S C 2019 Acta Phys. Sin. 68 114210
Google Scholar
[3] Webb K E, Xu Y Q, Erkintalo M, Murdoch S G 2013 Opt. Lett. 38 151
Google Scholar
[4] Xu F, Wu Z X, Lu Y Q 2017 Prog. Quantum Electron. 55 35
Google Scholar
[5] Morosi J, Berti N, Akrout A, Picozzi A, Guasoni M, Fatome J 2018 Opt. Express 26 845
Google Scholar
[6] Bromage J, Paper T 2004 J. Lightwave Technol. 22 79
Google Scholar
[7] Mao Y Q, Wang B X, Zhao C X, Wang G Q, Wang R C, Wang H H, Nie J M, Chen Q, Zhao Y, Zhang Q, Zhang J, Chen T Y, Pan J W 2017 Opt. Express 26 6010
[8] Semrau D, Killey R, Bayvel P 2017 Opt. Express 25 13024
Google Scholar
[9] Santos J L, Leite A P, Jackson D A 1992 Appl. Opt. 31 7361
Google Scholar
[10] 涂兴华, 赵宜超 2019 物理学报 68 244204
Google Scholar
Tu X H, Zhao Y C 2019 Acta Phys. Sin. 68 244204
Google Scholar
[11] Zhou D P, Peng W, Chen L, Bao X Y 2019 Opt. Express 27 17069
Google Scholar
[12] Chai Q, Luo Y 2019 Opt. Eng. 58 1
[13] 刘昱, 任国斌, 靳文星, 吴越, 杨宇光, 简水生 2018 物理学报 67 014208
Google Scholar
Liu Y, Ren G B, Jin W X, Wu Y, Yang Y G, Jian S S 2018 Acta Phys. Sin. 67 014208
Google Scholar
[14] Chen L, Duan Y H, Zhou H D, Zhou X, Zhang C, Zhang X L 2017 Opt. Express 25 9416
Google Scholar
[15] Redding B, Alam M, Seifert M, Cao H 2014 Optica 1 175
Google Scholar
[16] Shaw M J, Henson R L, Houk S E, Westhoff J W, Jones M W, Richter-Addo G 2002 J. Electroanal. Chem. 534 47
Google Scholar
[17] Hornig G J, Harrison T R, Bu L, Azmayesh-Fard S, Decorby R G 2019 OSA Continuum 2 495
Google Scholar
[18] Hang Q, Ung B, Syed I, Guo N, Skorobogatiy M 2010 Appl. Opt. 49 4791
Google Scholar
[19] Xu Z C, Wang Z L, Sullivan M, Brady D, Foulger S H, Adibi A 2003 Opt. Express 11 2126
Google Scholar
[20] Yang T, Xu C, Ho H P, Zhu Y Y, Hong X H, Wang Q J, Chen Y C, Li X A, Zhou X H, Yi M D, Huang W 2015 Opt. Lett. 40 3217
Google Scholar
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