Article
Optics
Yanbiao Chang, Li Pei, Jingjing Zheng, Jianshuai Wang, Qian He, Jing Li, Tigang Ning, Li Zhong
Summary: An all-fiber few mode erbium doped fiber amplifier (FM-EDFA) with low differential modal gain (DMG) is demonstrated theoretically and experimentally. The all-fiber FM-EDFA with low DMG provides a cost-effective and stable alternative for high-integrated all-fiber long-haul spatial division multiplexing applications.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Hao Guo, Ting Li, Fengping Yan, Guobin Ren, Wei Wang, Xiangdong Wang, Qi Qin, Guifang Wu, Jiao Gao, Baoyuan Wang, Haoyu Tan, Wenhua Ren, Ting Feng
Summary: This article reports the design and characterization of a six-mode erbium-doped fiber amplifier (6M-EDFA) for mode division multiplexing systems. The design utilizes a center-depressed optical fiber and adjustment of parameters to reduce splice loss. Through analysis and optimization, high gain and low differential modal gain are achieved. The performance of the designed amplifier is verified using a MDM transmission system.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yaping Liu, Zhiqun Yang, Xutao Wang, Yongmin Jung, Lin Zhang
Summary: This paper proposes a new design for few-mode erbium-doped fiber amplifiers (FM-EDFAs) that achieves significantly reduced differential modal gain (DMG) through strong mode coupling. A new numerical model based on a fiber transfer matrix is used to systematically investigate the DMGs of FM-EDFAs and analyze two different types of six-mode fiber amplifiers as exemplar demonstrations.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Xucheng Zhang, Jinming Yan, Chunxue Wang, Tonghe Sun, Zhigeng Cao, Chongqian Xu, Guanshi Qin, Fei Wang, Daming Zhang
Summary: Mode-division multiplexing (MDM) is a new method of space-division multiplexing (SDM) that can greatly improve the capacity of optical fiber communication by breaking through the limitation of single-mode transmission capacity. The study explored a few-mode Er3+-Yb3+ co-doped waveguide amplifier (FM-EYCDWA) and established a theoretical model with a novel modified overlap integral factor. By equalizing the modified overlap integral factor of each signal mode, the FM-EYCDWA can reduce or eliminate the differential modal gain (DMG), demonstrating excellent performance in two optimization cases.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Shuangxi Zhang, Jianfei Liu, Xiangye Zeng, Jia Lu, Ying Wei, Ruiming Qi
Summary: A modified partitioned frequency domain equalization algorithm is proposed in this paper to address the slow convergence speed and poor equalization effect of digital equalizer in the polarization division multiplexed (PDM)-MDM system. Simulation results show that the modified algorithm can achieve significantly better SER performance and improve the convergence rate compared to the traditional algorithm.
Article
Optics
Zhiqi Li, Li Pei, Jingjing Zheng, Jianshuai Wang, Wenxuan Xu, Tigang Ning, Jing Li
Summary: The air-hole assisted few-mode fiber (AH-FMF) offers modal intensity balance and gain equalization potential through adaptive ion doping. This paper proposes an AH-FM-EDF with a multi-layered erbium doping profile. By optimizing the erbium doping proportion, the proposed erbium-doped fiber achieves significant reduction in differential modal gain and exhibits good gain flattening and fabrication tolerance over the entire C-band.
Article
Engineering, Electrical & Electronic
Wenxuan Xu, Li Pei, Jianshuai Wang, Jingjing Zheng, Zhiqi Li, Tigang Ning, Li Jing, Guobin Ren
Summary: This paper analyzes the gain characteristics of FM-EDFA with different mode combinations and wavelengths. The results show that under specific conditions, the multiplexing of different degenerate modes leads to differential mode gain (DMG). Compared with single-wavelength amplification, both the overall gain and the DMG decrease in the multi-wavelength case.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Jinglong Zhu, Yu Yang, Mingqing Zuo, Qichen He, Dawei Ge, Zhangyuan Chen, Yongqi He, Juhao Li
Summary: In this paper, a novel FM-GFF based on LPFG in DC-FMF is proposed to achieve independent gain flattening for each core mode. The weakly-coupled connection between DC-FMF and transmission FMF is maintained by their shared characteristics. Simulation results show that the proposed scheme can flatten the output gain spectra for all core modes in the DC-FMF to less than 0.6 dB in the entire C-band.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Qiang Qiu, Zhimu Gu, Le He, Yang Chen, Yang Lou, Xinyue Zhao, Xiaoke Yin, Wenzhen Li, Shaokun Liu, Jinggang Peng, Haiqing Li, Yingbin Xing, Yingbo Chu, Nengli Dai, Jinyan Li
Summary: This paper introduces a high power-efficiency, low differential mode gain few-mode amplifier based on an M-type double-cladding fiber, and verifies its feasibility in large-capacity long-haul mode division multiplexing transmission.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Li Pei, Yanbiao Chang, Jianshuai Wang, Jingjing Zheng, Tigang Ning, Jing Li, Bing Bai, Lei Shen, Li Zhong
Summary: This paper focuses on the effects of residual stress on modal gain equalization (MGE) in few-mode fiber amplifiers (FMFAs). The residual stress distributions of passive and active FMFs were measured, and it was found that increasing the erbium doping concentration can reduce the residual stress of the fiber core, resulting in a smoother refractive index curve. The experimental results suggest that decreasing residual stress can improve the differential modal gain of the FMFA.
Article
Optics
Jiang Xinrui, Wu Baojian, Xu Yan, Wen Feng, Qiu Kun
Summary: This study utilizes the adjustability of differential mode gain in FM-EDFAs to achieve mode gain equalization and compensation for mode-dependent loss, thereby enhancing the networking flexibility of mode division multiplexing systems. By producing a few-mode optical fiber device integrating an isolator and a wavelength division multiplexer, all-fiber FM-EDFAs are successfully built. Two optical amplifying experiments using codirectional and bidirectional pumps at a center wavelength of 1480 nm are conducted, and a maximum adjustable differential mode gain of 2.6 dB and 4.8 dB is achieved by adjusting the pump power ratio under a total pump power of 200 mW.
ACTA OPTICA SINICA
(2022)
Article
Engineering, Electrical & Electronic
Suhail K. Naik, Gausia Qazi
Summary: The suitability of seven LPlm modes in a uniform erbium doped profile (UEDP) system is studied. LP01; 980 nm; 1480 nm and LP41; 980 nm; 1480 nm are selected as two pump modes based on their least calculated values of differential modal overlap factor and differential spectral overlap factor. Improved optimal values of differential modal gain, differential modal bit error rate, differential modal quality factor are achieved in the proposed hybrid system.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Optics
Zhi-Huan Pang, Meng Liu, Ai-Ping Luo, Yi Xu, Wen-Cheng Xu, Songnian Fu, Zhi-Chao Luo
Summary: We propose a novel mode-dependent gain equalizer using a few-mode chirped fiber Bragg grating (FM-CFBG) to effectively mitigate the mode-dependent gain in an all-fiber 2-mode EDFA. The equalizer based on FM-CFBG offers compact size, low insertion loss, and wavelength scalability, making it meaningful for long-haul MDM transmission.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Taban Qayoom, Gausia Qazi, Hakim Najeeb-ud-din
Summary: Different designed Modal Gain Equalized Few Mode-Erbium Doped Fiber Amplifier (FM-EDFA) systems are evaluated and compared in this paper. With increase in signal modes, an appropriate pump combination is more effective in reduction of both Differential Modal Gain (DMG) and Amplified Spontaneous Emission (ASE) ratio. The Power Conversion Efficiency (PCE) decreases as the number of modes increases, but all FM-EDFA systems show comparable pre-amplification performance up to data rates of 15 Gb/s.
Article
Optics
Wei Yan, Baojian Xu, Xinrui Jiang, Chang Gao, Feng Wen, Kun Qiu
Summary: The combination of dual-polarization (DP) high-order modulation format with mode division multiplexing (MDM) technology effectively improves the transmission capacity of optical fiber communication. An experimental system is built for amplification and transmission of DP-MDM signals with orthogonal mode combination (OMC) and identical mode combination (IMC). The MDM transceiver units consist of mode-selective photonic lanterns (MSPLs) and few-mode polarization controllers (FMPCs). The experimental results show that OMC DP-MDM signals have better performance in differential modal gain (DMG) compared to IMC cases and the OMC DP-MDM system has a larger optical power margin than the IMC system by 2.2 dB under optimization conditions.
OPTICS COMMUNICATIONS
(2023)
Article
Automation & Control Systems
Albert V. Korolev, Andrey A. Korolev, Radoslav Krehel'
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2017)
Article
Engineering, Mechanical
Albert V. Korolev, Andrey A. Korolev, Radoslav Krehel
MECHANISM AND MACHINE THEORY
(2014)
Proceedings Paper
Engineering, Electrical & Electronic
Oleg V. Zakharov, Fedor V. Grechnikov, Nikolaj M. Bobrovskij, Andrei V. Kochetkov, Igor N. Bobrovskij, Andrey A. Korolev
2016 13TH INTERNATIONAL SCIENTIFIC-TECHNICAL CONFERENCE ON ACTUAL PROBLEMS OF ELECTRONIC INSTRUMENT ENGINEERING (APEIE), VOL 1
(2016)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Albert Korolev, Andrey Korolev, Andrey Balaev, Boris Iznairov, Kristina Neugebauer, Alexander Yakovishin, Elena Mukhina, Sergey Savran
2016 INTERNATIONAL CONFERENCE ON INFORMATICS, MANAGEMENT ENGINEERING AND INDUSTRIAL APPLICATION (IMEIA 2016)
(2016)
Proceedings Paper
Engineering, Mechanical
Albert Korolev, Andrey Korolev, Boris Iznairov
2015 INTERNATIONAL CONFERENCE ON MECHANICAL ENGINEERING, AUTOMATION AND CONTROL SYSTEMS (MEACS)
(2015)
Proceedings Paper
Biophysics
Albert V. Korolev, Andrey A. Korolev, Michel M. Zhuravlev
SARATOV FALL MEETING 2014: OPTICAL TECHNOLOGIES IN BIOPHYSICS AND MEDICINE XVI; LASER PHYSICS AND PHOTONICS XVI; AND COMPUTATIONAL BIOPHYSICS
(2015)
Proceedings Paper
Biophysics
Albert V. Korolev, Andrey A. Korolev, Michel M. Zhuravlev
SARATOV FALL MEETING 2014: OPTICAL TECHNOLOGIES IN BIOPHYSICS AND MEDICINE XVI; LASER PHYSICS AND PHOTONICS XVI; AND COMPUTATIONAL BIOPHYSICS
(2015)
Article
Plant Sciences
Amy Watson, Sreya Ghosh, Matthew J. Williams, William S. Cuddy, James Simmonds, Maria-Dolores Rey, M. Asyraf Md Hatta, Alison Hinchliffe, Andrew Steed, Daniel Reynolds, Nikolai M. Adamski, Andy Breakspear, Andrey Korolev, Tracey Rayner, Laura E. Dixon, Adnan Riaz, William Martin, Merrill Ryan, David Edwards, Jacqueline Batley, Harsh Raman, Jeremy Carter, Christian Rogers, Claire Domoney, Graham Moore, Wendy Harwood, Paul Nicholson, Mark J. Dieters, Ian H. DeLacy, Ji Zhou, Cristobal Uauy, Scott A. Boden, Robert F. Park, Brande B. H. Wulff, Lee T. Hickey
