Article
Engineering, Electrical & Electronic
Ruby S. B. Ospina, Menno van den Hout, Sjoerd van der Heide, John van Weerdenburg, Roland Ryf, Nicolas K. Fontaine, Haoshuo Chen, Rodrigo Amezcua-Correa, Chigo Okonkwo, Darli A. A. Mello
Summary: This paper introduces a method for estimating mode-dependent gain (MDG) and optical signal-to-noise ratio (SNR) using artificial neural networks (ANNs) and validates it through experiments. The results show that the proposed method can accurately estimate MDG and SNR, outperforming conventional methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Manabu Arikawa, Kohei Nakamura, Kohei Hosokawa, Kazunori Hayashi
Summary: We demonstrated a successful long-haul WDM and SDM transmission of 32-Gbaud polarization-division multiplexed quadrature phase-shift keying signals. Our experiment showed that the mode dependent loss (MDL) of the coupled-4-core EDFAs was a major limiting factor for transmission performance, and the rms MDL per span should be below 0.4 dB for further long-haul transmission distance over 6000 km.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yongze Liang, Guorui Wang, Jiwei Zhang, Han Zhang, Enwang Liang, Fang Wang, Xuenan Zhang, Xin Yan, Tonglei Cheng
Summary: In this study, an all-optical fiber-based mode converter was created by combining a self-made 5-mode fiber with a single mode fiber using the fused tapering approach. By controlling the core size, high-efficiency mode conversions were achieved between the fundamental mode in the single mode fiber and the five modes in the 5-mode fiber. Additionally, a 5-mode-division multiplexer was produced by cascading the mode converters, providing a convenient and effective option for constructing high-capacity mode division multiplexing communication systems.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Feng Liu, Zhenxing He, Wenping Zhang, Lixin Xu
Summary: In this study, a novel measurement method of mode dependent loss (MDL) in few-mode fiber (FMF) is proposed and experimentally demonstrated using mode multiplexing power control. The results show that this method is effective in measuring MDL between LP01 and LP11 modes in a 9.8km 3-mode fiber. The proposed scheme is scalable to measure long-distance FMFs with a large number of modes and is independent of photonic lantern mode crosstalk.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Information Systems
Miaofang Zhou, Ping Jiang, Huajun Yang, Weinan Caiyang, Yan Qin, Yifan Zheng
Summary: This paper proposes a new type of optical fiber structure with air trenches, air holes, and a depressed step-index core for efficient mode separation. Simulation results show that the fiber can support up to 12 spatial modes with broadband characteristics.
Article
Engineering, Electrical & Electronic
Min Yang, Hongya Wang, Lulu Wang, Lei Shen, Lei Zhang, Jie Luo, Jing Du, Jian Wang
Summary: In this study, we experimentally demonstrate the record long-haul transmission of orbital angular momentum (OAM) mode-division multiplexed (MDM) signals over 300 km using a ring-core fiber (RCF) recirculating loop. The low-crosstalk feature of RCF allows for favorable OAM-based MDM transmission performance in the 300 km loop link.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Optics
Anuranjana, Sanmukh Kaur, Rakesh Goyal, Sushank Chaudhary
Summary: This work analyzes the performance of a terrestrial MDM-WDM FSO link at a data rate of 1000 Gbps using a dual polarization-quadrature phase shift keying (DP-QPSK) modulation scheme. The study investigates the link's performance considering linearly polarized (LP) 01 and 02 modes with a channel capacity and spacing of 10 x 100 Gbps and 10 GHz respectively. The evaluated parameters include received optical power and signal to noise ratio (SNR) under different weather conditions (clear, light fog, medium fog, and heavy fog) over a transmission range of 1.2 km to 20 km.
Article
Engineering, Electrical & Electronic
Mohannad Shehadeh, Frank R. Kschischang
Summary: We demonstrate that channel capacity for a widely used model of channels with polarization-dependent loss (PDL) can be achieved by a simple interference cancellation scheme and a universal precoder. The proposed scheme is not only information-theoretically optimal, but also exceptionally simple and concrete. It transforms the PDL channel into separate scalar additive white Gaussian noise channels, allowing off-the-shelf coding and modulation schemes designed for such channels to approach capacity. The incurred signal-to-noise ratio (SNR) penalty under 6 dB of PDL is reduced to the information-theoretic minimum of 1 dB, as opposed to the 4 dB SNR penalty incurred under naive over-provisioning.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Jaewon Oh, Kangmei Li, Jun Yang, Wei Ting Chen, Ming-Jun Li, Paulo Dainese, Federico Capasso
Summary: This study introduces a mode-division multiplexer and demultiplexer design based on a metasurface cavity, which can perform mode conversion and coupling to fibers on a single surface without the need for additional optics. The converted modes have high fidelity due to the optimized phase profile of the metasurface.
Article
Engineering, Electrical & Electronic
Yingning Wang, Yuanpeng Liu, Wenqian Zhao, Jian Yang, Wenpu Geng, Yuxi Fang, Changjing Bao, Yongxiong Ren, Zhi Wang, Yan-ge Liu, Zhongqi Pan, Yang Yue
Summary: This paper designs and analyzes a multi-ring-air-core fiber supporting thousands of OAM modes, and investigates the tradeoffs between ring number/density and system performance parameters. Based on the analytical results, the fiber has high transmission rate and spectrum efficiency, and shows great potential for various applications in optical communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Telecommunications
Yi Lei, Qi Lu, Bin Chen, Zhongyi Guo
Summary: The MDM-based MMF MIMO channel condition and the impact of channel condition fluctuation on system performance were studied. By using adaptive coded modulation, the MDM-based 3 x 3 MIMO channel achieved high spectral efficiency.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Takayoshi Mori, Takeshi Fujisawa, Junji Sakamoto, Yoko Yamashita, Taiji Sakamoto, Ryota Imada, Ryoto Ima, Takanori Sato, Kei Watanabe, Ryoichi Kasahara, Toshikazu Hashimoto, Kunimasa Saitoh, Kazuhide Nakajima
Summary: A low-loss and compact silica-based planar lightwave circuit (PLC) mode-dependent loss (MDL) equalizer is proposed for three-mode transmission. The device selectively attenuates one mode while maintaining low insertion loss for the others, effectively reducing modal gain differences. The variable range of the equalizer has a tradeoff relationship with wavelength bandwidth.
OPTICAL FIBER TECHNOLOGY
(2023)
Review
Optics
Svetlana Nikolaevna Khonina, Nikolay Lvovich Kazanskiy, Muhammad Ali Butt, Sergei Vladimirovich Karpeev
Summary: This review presents an attention-grabbing and up-to-date overview of major multiplexing techniques, including wavelength division multiplexing, polarization division multiplexing, space division multiplexing, mode division multiplexing, and orbital angular momentum multiplexing. It also discusses hybrid multiplexing methods and techniques. This unique review paper highlights the most prominent and recent progress in multiplexing techniques in one place.
OPTO-ELECTRONIC ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Haoyang Ren, Yingning Wang, Wenpu Geng, Wenqian Zhao, Runzhou Zhang, Zhongqi Pan, Yang Yue
Summary: This paper presents a design of a multi-ring air-core trench-assisted fiber that supports transmission over the entire C + L band with low inter-ring crosstalk. The effects of the ring spacing, wavelength range, and doping concentration on the crosstalk suppression are systematically investigated. The complexity of the MIMO processing system is greatly reduced with a fewer-optical-core structure while keeping low inter-ring crosstalk.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Jiajing Tu, JinPei Li, Tianjin Wen, Yongguang Xiao, Quanchao Lu, Jianye Zhao, Yingyu Chen, Hanyu Gao, Lei Shen, Lei Zhang, Liubo Yang, Wei Li, Cheng Du, Shecheng Gao, Xingwen Yi, Weiping Liu, Zhaohui Li
Summary: This study focuses on OAM mode supporting few-mode RCF solutions for submarine cables and proposes a 3-OAM-MG RCF with a core-cladding index contrast of 0.6%. Experimental results demonstrate the potential application of this transmission system in a long-haul submarine cable system.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Menno van den Hout, Sjoerd van der Heide, Chigo Okonkwo
Summary: This study investigates the feasibility of using digital phase reconstruction to retrieve the phase information of directly detected minimum phase optical signals. The results show that digitally adding the carrier tone at the transmitter can reduce hardware complexity and employing a digital resolution enhancer improves transmission performance and allows for a reduction in the resolution of the DAC system without significant performance penalty.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jasper de Graaf, Xinran Zhao, Dimitrios Konstantinou, Menno van den Hout, Sander Reniers, Longfei Shen, Sjoerd van der Heide, Simon Rommel, Idelfonso Tafur Monroy, Chigo Okonkwo, Zizheng Cao, Ton Koonen, Kevin Williams, Yuqing Jiao
Summary: We have demonstrated a waveguide integrated uni-traveling carrier photodiode with a 3 dB bandwidth beyond 110 GHz on an InP-membraneon-silicon platform. By optimizing the design and improving the process, we successfully realized devices as small as 3 x 2 μm(2). An electrical equivalent circuit model based on measured S-parameters revealed ultra-small series resistance and junction capacitance in the diodes. The model also provided insights into the photocurrent dependent characteristics in the bandwidth and responsivity of the devices. Finally, we demonstrated data transmission measurements, showcasing the high speed telecommunication abilities of the UTC-PD.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Ruby S. B. Ospina, Menno van den Hout, Sjoerd van der Heide, John van Weerdenburg, Roland Ryf, Nicolas K. Fontaine, Haoshuo Chen, Rodrigo Amezcua-Correa, Chigo Okonkwo, Darli A. A. Mello
Summary: This paper introduces a method for estimating mode-dependent gain (MDG) and optical signal-to-noise ratio (SNR) using artificial neural networks (ANNs) and validates it through experiments. The results show that the proposed method can accurately estimate MDG and SNR, outperforming conventional methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Caio Santos, Vinicius Oliari, Helder Rocha, Maria Pontes, Marcelo Segatto, Chigo Okonkwo, Alex Alvarado, Jair Silva
Summary: The article demonstrates the tolerance enhancements of constant-envelope OFDM (CE-OFDM) signals compared to conventional OFDM signals towards Mach-Zehnder modulator (MZM) intermodulation impairments and fiber nonlinear Kerr effects. The experiments show successful transmission of CE-OFDM signals over a 1000 km dispersion-uncompensated fiber link, indicating the potential of CE-OFDM for cost-sensitive applications and metro/regional optical links.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Kayol S. Mayer, Rossano P. Pinto, Jonathan A. Soares, Dalton S. Arantes, Christian E. Rothenberg, Vinicius Cavalcante, Leonardo L. Santos, Filipe D. Moraes, Darli A. A. Mello
Summary: This paper presents an experimental demonstration of a machine-learning-based soft-failure localization framework that can accurately locate subtle anomalies using network telemetry. The results show that the scheme successfully pinpoints the faulty element in single-failure scenarios and is able to handle double-failure scenarios.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jose C. Junior Helio, Tiago Sutili, Rafael C. Figueiredo, Darli A. A. Mello
Summary: This paper evaluates the selective combination of algorithms for fiber nonlinearity compensation, transceiver impairments mitigation, and variable-rate coding in unrepeatered optical transmission. The performance and complexity of the proposed digital subsystems are experimentally evaluated, elucidating the trade-off of complexity and performance in unrepeatered optical transmission.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Sebastiaan Goossens, Yunus Can Gultekin, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo Okonkwo, Alex Alvarado
Summary: Four dimensional geometric shell shaping (4D-GSS) is introduced as a method to close the shaping gap caused by nonlinearity. It is compared with polarization-multiplexed 16QAM (PM-16QAM) and probabilistically shaped PM-16QAM (PS-PM-16QAM) in a high nonlinearity 400ZR-compatible transmission setup. The 4D-GSS achieves increased nonlinear tolerance and reach increase against PM-16QAM and PS-PM-16QAM, especially when optimized for mutual information.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
G. Di Sciullo, M. van den Hout, G. Rademacher, R. S. Luis, B. J. Puttnam, N. K. Fontaine, R. Ryf, H. Chen, M. Mazur, D. T. Neilson, P. Sillard, F. Achten, J. Sakaguchi, C. Okonkwo, H. Furukawa
Summary: In this study, we experimentally investigated a mode permutation scheme to mitigate the impact of differential mode delay in a long-haul fiber link with 15 modes. The scheme effectively reduced the rate of increase in the link's intensity impulse response duration with transmission distance, thereby minimizing delay spread between wavelength channels across the C-band.
2023 IEEE PHOTONICS SOCIETY SUMMER TOPICALS MEETING SERIES, SUM
(2023)
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
Yunus Can Gultekin, Alex Alvarado, Olga Vassilieva, Inwoong Kim, Paparao Palacharla, Chigo M. Okonkwo, Frans M. J. Willems
Summary: Band-trellis enumerative sphere shaping is proposed to decrease energy variations in channel input sequences, resulting in SNR gain and increased data rates.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
