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Mode division multiplexing reconstructive spectrometer with an all-fiber photonics lantern |
Junrui Liang1, Jun Ye1,2,3, Xiaoya Ma1, Yao Lu4, Jun Li1, Jiangming Xu1( ), Zilun Chen1,2,3, Jinyong Leng1,2,3, Zongfu Jiang1,2,3, Pu Zhou1() |
1. College of Advanced Disciplinary Studies, National University of Defense Technology, Changsha 410073, China
2. Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
3. Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China
4. Space Engineering University, Beijing 101416, China |
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Abstract This study presents a high-accuracy, all-fiber mode division multiplexing (MDM) reconstructive spectrometer (RS). The MDM was achieved by utilizing a custom-designed 3 × 1 mode-selective photonics lantern to launch distinct spatial modes into the multimode fiber (MMF). This facilitated the information transmission by increasing light scattering processes, thereby encoding the optical spectra more comprehensively into speckle patterns. Spectral resolution of 2 pm and the recovery of 2000 spectral channels were accomplished. Compared to methods employing single-mode excitation and two-mode excitation, the three-mode excitation method reduced the recovered error by 88% and 50% respectively. A resolution enhancement approach based on alternating mode modulation was proposed, reaching the MMF limit for the 3 dB bandwidth of the spectral correlation function. The proof-of-concept study can be further extended to encompass diverse programmable mode excitations. It is not only succinct and highly efficient but also well-suited for a variety of high-accuracy, high-resolution spectral measurement scenarios.
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| Keywords
High-accuracy
Resolution enhancement
Reconstructive spectrometer
Mode division multiplexing
Photonics lantern
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Corresponding Author(s):
Jiangming Xu,Pu Zhou
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| About author: #These authors contributed equally to this work. |
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Issue Date: 08 August 2024
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