Article
Engineering, Electrical & Electronic
Yuxin Ding, Jianshe Li, Shuguang Li, Yu Qin, Zelin Zhang, Xiaokai Wang, Ying Guo, Xiaojian Meng, Huijing Du
Summary: We propose an elliptical-core mode selective photonic lantern (EC-MSPL) that is suitable for mode division multiplexing (MDM) systems without multiple-input multiple-output (MIMO) capability. By optimizing the taper related parameters in a two-stage approach, we obtain a small package taper region that satisfies the adiabatic condition, enabling a shorter taper length without affecting the performance of the photonic lantern (PL). Simulations show that both step-index and graded-index EC-MSPLs can achieve low-loss mode conversion and crosstalk below -15.6 dB at a wavelength of 1550 nm, with coupling efficiencies above 85% and 71% for the two PL modes in the S+C+L bands.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Xiao Liu, Meiling Zhang, Peng Zhang, Guijun Hu
Summary: In this paper, a 2-D beamforming system based on the photonic lantern (PL) and few-mode fiber Bragg grating (FM-FBG) with a 3 x 3 antenna array is proposed. The FM-FBG is produced by the femtosecond laser point-by-point method, which is flexible and simple; moreover, the 2-D time delay regulation can be realized with different positions of FM-FBG by a single wavelength and single-stage optical true time delay (OTTD) modules to complete the 2-D beam scanning, which reduces the system cost, complexity and simplifies the system structure. The effects of different types of PLs on the system are investigated, and the results show that the channel amplitude dither of the 2-D beamforming system using non-mode-selective PLs is less than 1.5 dB, and the main lobe beamwidth and sidelobe level are smaller than those of the mode-selective PL system. Additionally, the effect of the polarization state of optical on the gain of the system is studied, and the experiment results show that the overall gain of the system is improved by 2.27 dB when we adjust the optical polarization state to the optimum. Under this best-adjusted polarization state, a 2-D beamforming system based on the non-mode-selective PL is constructed, with time delay steps of (12 ps, 10 ps). The system can achieve elevation and azimuth angles by switching the operating state of the optical switch for the scanning ranges of 0 degrees -60 degrees and 0 degrees -35 degrees, respectively.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Han Wang, Takeshi Fujisawa, Takanori Sato, Takayoshi Mori, Taiji Sakamoto, Yoko Yamashita, Ryota Imada, Kazuhide Nakajima, Kunimasa Saitoh
Summary: We propose 6-mode and 10-mode photonic lantern mode multiplexers based on two-and three-layer silica planar lightwave circuitry, respectively. The 6-mode multiplexer achieves transmission greater than -0.19 dB at a wavelength of 1550 nm for six different modes. The 10-mode multiplexer is designed to excite selected modes and achieves transmission greater than -1.15 dB at a wavelength of 1550 nm.
OPTICS COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Yao Lu, Zongfu Jiang, Hu Xiao, Zilun Chen, Man Jiang, Junyu Chai, Hao Yang, Lianchuang Ding, Dan Zhang, Jiangbin Zhang, Qiong Zhou, Wenguang Liu
Summary: This study demonstrates a method for stabilizing the output beam of a large-mode-area fiber amplifier above the mode instability threshold. A mode control system based on the photonic lantern is used to excite dynamic mode beatings in a 42/250 μm Yb-doped fiber amplifier. The validity of this method is theoretically explained by the antisymmetry of the mode interference patterns generated by input mode beatings and the main amplifier's patterns caused by thermally induced non-linear effects, preventing the formation of a refractive index grating to indicate the onset of mode instability. Significant mode stability and beam quality improvement have been achieved in experimental settings up to nearly four times the mode instability threshold.
FRONTIERS IN PHYSICS
(2023)
Article
Optics
Jian Cui, Yuyang Gao, Yu Yang, Dawei Ge, Yongqi He, Zhangyuan Chen, Juhao Li
Summary: This paper proposes a highly mode-selective PL-MMUX/MDEMUX design for intensity-modulation/direct-detection MDM transmission. By adopting non-degenerate modes or pairs of degenerate modes as independent channels and utilizing differential-phase injection (DPI) scheme and dissimilar core arrangement method, a very high modal selectivity is achieved.
OPTICS COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Elham Nazemosadat, Ivana Gasulla
Summary: In this study, we experimentally demonstrate tunable true-time delay line operation over a few-mode fiber link for the first time. The performance of this true-time delay line when applied to microwave signal filtering is also assessed.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Chien-Hung Yeh, Li-Hung Liu, Wen-Piao Lin, Han-Shin Ko, Yi-Ting Lai, Chi-Wai Chow
Summary: A simple self-restored WDM-PON system is proposed in order to avoid fiber link faults. Additional optical components are added to OLT, RN, and ONU to create alternative fiber paths for fault protection. Through utilizing 10 Gb/s OOK downstream and upstream wavelengths to measure BER performances, the modulation signals are ensured to meet power budget requirements under FEC levels for total insertion loss caused by various fiber links and devices.
Article
Optics
Aanchal Sharma, Sanmukh Kaur, Nivedita Nair, Kamaljit Singh Bhatia
Summary: This paper proposes a 100 Gbps, 4-channel WDM-MDM PON system using two input wavelengths of 1550 nm and 1555 nm and LP 01 and LP 11 modes. The performance of the system has been analyzed for different internal parameters, and it is found that the DRZ modulation scheme achieves an acceptable bit error rate at a data rate of 25 Gbps over 10 km of fiber length.
Article
Physics, Applied
Yuxin Ding, Jianshe Li, Shuguang Li, Xiaokai Wang, Ying Guo, Xiaojian Meng, Yuanyuan Zhao, Huijing Du
Summary: In this paper, a broadband mode converter based on photonic crystal fiber (PCF) is proposed. Numerical results show that this mode converter has high mode coupling efficiency and mode extinction ratio, and it can realize cascade multiplexing. Additionally, a multi-core mode multiplexer structure is proposed, which allows the simultaneous reuse of three modes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Rabiu Imam Sabitu, Nafizah Goriman Khan, Amin Malekmohammadi
Summary: This paper reports on mode conversion using tilted few-mode fiber assisted by dual arc waveguide. A multilayer core multimode fiber is used for modeling the device. The optimized device achieves high efficiency conversions between different modes, making it suitable for mode-division multiplexing communication.
Article
Engineering, Electrical & Electronic
Xun Guan, Raphael Dube-Demers, Wei Shi, Leslie A. Rusch
Summary: The study introduces a new silicon photonic solution to deliver 5G services on existing optical access networks, allowing for densification of 5G coverage. The proposed scheme is wavelength-selective in the distribution network and colorless at the end user site, enabling successful coexistence of 5G signals and broadband signals in various formats.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Komal Ojha, Darpan Mishra, Kumar Appaiah, Deepak Jain
Summary: This study investigates the use of graded-index few-mode fiber (GI-FMF) for mode-division-multiplexed transmission with a 4-LP-mode fiber. The GI-FMF is optimized for large effective indices differences (Delta n(eff)) and low differential mode delay (DMD) between LP modes by adjusting profile parameters, refractive index differences, and core radius. The optimized parameters for weakly-coupled WC-GI-FMF and strongly-coupled SC-GI-FMF are reported, demonstrating the potential of GI-FMF for various applications. The narrow air trench-assisted SC-GI-FMF is also explored to further reduce DMD.
Article
Optics
Neethu Mariam Mathew, Lars Gruner-Nielsen, Mads Lillieholm, Michael Galili, Karsten Rottwitt
Summary: This paper presents the fabrication steps for an air-clad photonic lantern that can excite the first two LP mode groups in a multimode fiber. Experimental results show excellent performance of the fabricated lantern in terms of multiplexing crosstalk, demultiplexing crosstalk, and MDM transmission.
Article
Engineering, Electrical & Electronic
Yibin Wan, Bo Liu, Yaya Mao, Jianxin Ren, Rahat Ullah, Shuaidong Chen, Xiangyu Wu, Yu Bai, Xiumin Song, Rong Tang, Haojing Zhang, Yongfeng Wu
Summary: This paper proposes a novel chaotic power division multiplexing (CPDM) for secure optical multiple access, which can improve spectral efficiency and user capacity, and ensure information security. Experimental results show that the system can achieve high spectral efficiency and large traffic capacity, and serve more users.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Shuang Wang, Xiao Liu, Meiling Zhang, Guijun Hu
Summary: This study presents a reconfigurable and tunable microwave photonic filter based on few-mode fibers, which can achieve reconfigurability and tunability by changing the length of the fiber and the number of excited modes.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Optics
Alireza Fardoost, He Wen, Huiyuan Liu, Fatemeh Ghaedi Vanani, Guifang Li
Article
Optics
Huiyuan Liu, He Wen, Bin Huang, Zhihong Li, Guifang Li
Article
Engineering, Electrical & Electronic
Min Teng, Amirmahdi Honardoost, Yousef Alahmadi, Sajad Saghaye Polkoo, Keisuke Kojima, He Wen, C. Kyle Renshaw, Patrick LiKamWa, Guifang Li, Sasan Fathpour, Reza Safian, Leimeng Zhuang
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Optics
He Wen, Huiyuan Liu, Yuanhang Zhang, Rachel Sampson, Shengli Fan, Guifang Li
Article
Optics
Ning Wang, J. C. Alvarado-Zacarias, Md Selim Habib, He Wen, J. E. Antonio-Lopez, Pierre Sillard, A. Amezcua-Correa, Axel Schuelzgen, R. Amezcua-Correa, Guifang Li
Article
Optics
Alireza Fardoost, Fatemeh Ghaedi Vanani, He Wen, Guifang Li
Article
Optics
Amado M. Velazquez-Benitez, Juan Hernandez-Cordero
Article
Optics
He Wen, Yuanhang Zhang, Rachel Sampson, Nicolas K. Fontaine, Ning Wang, Shengli Fan, Guifang Li
Summary: The proposed NMS mux design based on MPLC can coherently combine hundreds of discrete input beams into output beams consisting of HG modes using only a few phase masks. The design supports 256 HG modes with low loss and mode crosstalk.
PHOTONICS RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Rachel Sampson, He Wen, Bin Huang, Rodrigo Amezcua Correa, Yaron Bromberg, Hui Cao, Guifang Li
Summary: The research proposes and demonstrates high-speed operation of random-channel cryptography (RCC) in multimode fibers. By adding a fast modulator, the key rate and distance are decoupled, leading to a significant improvement in the key rate-distance product.
IEEE PHOTONICS JOURNAL
(2021)
Article
Optics
Dahi L. Hernandez-Roa, Yesenia A. Garcia-Jomaso, Neil C. Bruce, Jesus Garduno-Mejia, Oscar Pilloni, Laura Oropeza-Ramos, Carlos G. Trevino-Palacios, Cesar L. Ordonez-Romero, Amado M. Velazquez-Benitez, Naser Qureshi
Summary: The transmission properties of a photonic crystal immersed in different oils were studied using terahertz time domain spectroscopy. The results showed that the effective refractive index of the photonic crystal is sensitive to the properties of the oils, which cannot be observed in bulk measurements. These findings have potential applications in the sensing of small volumes of oils and the control of refractive indices in photonic crystals.
Article
Optics
Oscar Gonzalez-Cortez, Amado M. Velazquez-Benitez
Summary: We propose a detailed method for interconnecting optical fibers and waveguides of photonic integrated circuits. The method achieves appropriate modal transmission by matching the mode field diameters of the waveguide structures. An interconnecting waveguide is used to create links between different structures, with its size modified to maintain a fixed coupling efficiency. This tailored transition serves as a mode field adapter, equalizing transmission among multiple modes and reducing mode-dependent losses during coupling. The method is demonstrated through a case study and achieves coupling efficiencies over 90% for every transmitted mode, surpassing typical approaches that only match core sizes.
Article
Optics
Ricardo Defas-Brucil, Mildred S. Cano-Velazquez, Amado M. Velazquez-Benitez, Juan Hernandez-Cordero
Summary: We present a simple fabrication technique for creating Fabry-Perot sensors with microbubbles formed within polymer drops on the tips of optical fibers. By incorporating carbon nanoparticles in the polymer layer, a microbubble aligned along the fiber core can be generated via the photo-thermal effect. These microbubble end-capped FP sensors demonstrate reproducible performance and show high sensitivity in temperature measurements and displacement sensing.
Proceedings Paper
Engineering, Electrical & Electronic
Sjoerd van der Heide, Bram van Esch, Menno van den Hout, Thomas Bradley, Amado M. Velazquez-Benitez, Nicolas K. Fontaine, Roland Ryf, Haoshuo Chen, Mikael Mazur, Jose Enrique Antonio-Lopez, Juan Carlos Alvarado-Zacarias, Rodrigo Amezcua-Correa, Chigo Okonkwo
Summary: Angular resolved digital holography is a technique for realtime characterization of the full optical field. It was used to characterize a 6-mode photonic-lantern.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Ning Wang, Inwoong Kim, Olga Vassilieva, Tadashi Ikeuchi, He Wen, J. E. Antonio-Lopez, J. C. Alvarado-Zacarias, Pierre Sillard, Cedric Gonnet, Huiyuan Liu, Shengli Fan, Md Selim Habib, Rodrigo Amezcua-Correa, Guifang Li
2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Yousef Alahmadi, He Wen, Patrick LiKam Wa, Guifang Li
2019 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2019)
