Mode division multiplexing reconstructive spectrometer with an all-fiber photonics lantern  

作　　者：Junrui Liang Jun Ye Xiaoya Ma Yao Lu Jun Li Jiangming Xu Zilun Chen Jinyong Leng Zongfu Jiang Pu Zhou 

机构地区：[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

出　　处：《Frontiers of Optoelectronics》2024年第3期29-38,共10页光电子前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Grant No.62305391);Hunan Innovative Province Construction Project(No.2019RS3017);Scientifc Fund of National University of Defense Technology(No.22-061).

摘　　要：This study presents a high-accuracy,all-fber 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 fber(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 efcient but also well-suited for a variety of high-accuracy,high-resolution spectral measurement scenarios.

关 键 词：High-accuracy Resolution enhancement Reconstructive spectrometer Mode division multiplexing Photonics lantern 

分 类 号：TH744.1[机械工程—光学工程]