Songyuan Hu;Yunhong Liu;Peng Sun;Xu Zhang;Zichen Liu;Zhixue He;Chao Li
{"title":"Polarization Insensitive Real-Time OWC Enabled by Multi-Mode-Based Beam Shaping via Offset Launch","authors":"Songyuan Hu;Yunhong Liu;Peng Sun;Xu Zhang;Zichen Liu;Zhixue He;Chao Li","doi":"10.1109/LPT.2025.3552954","DOIUrl":"https://doi.org/10.1109/LPT.2025.3552954","url":null,"abstract":"Optical wireless communication (OWC) utilizing unregulated broadband optical spectrum is regarded as a powerful candidate to meet the requirement for high-speed wireless connectivity. Here we propose a polarization insensitive OWC scheme by using multi-mode based beam shaping (MM-BS) technique via offset launch in a multi-mode fiber (MMF). With the proposed configuration and coherent dual polarization QPSK (DP-QPSK) modulation, a real-time 10 Gb/s optical wireless link over 4.2 m free-space is experimentally demonstrated for multi-user scenario, achieving −38.8 dBm receiver sensitivity and >12cm coverage range. Moreover, a 20 Gb/s PAM4 OWC link over 1.2 m free-space is performed with −22.2 dBm receiver sensitivity and >3.2 cm coverage range. The measured results reveal the feasibility of the proposed scheme to build a high-speed high-performance wireless connectivity.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 12","pages":"659-662"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Full-Duplex RO-ISAC System: Wavelength Division Duplexing and Hybrid Waveform Design","authors":"Shuhang Chen;Chen Chen;Zhihong Zeng;Yanbing Yang;Harald Haas","doi":"10.1109/LPT.2025.3570997","DOIUrl":"https://doi.org/10.1109/LPT.2025.3570997","url":null,"abstract":"Integrated sensing and communication (ISAC) using light has attracted attention recently, and retroreflective optical ISAC (RO-ISAC) realizes passive sensing by equipping the target with a corner cube reflector (CCR) to enhance light reflection. In this Letter, we propose and demonstrate a full-duplex RO-ISAC system based on wavelength division duplexing (WDD) with a hybrid waveform design. Specifically, WDD is enabled by adopting blue and green lights for downlink and uplink transmissions, respectively. To avoid the interference between the reflected downlink signal and the uplink signal, a pair of blue and green optical filters are employed. Moreover, a hybrid single-carrier and multi-carrier (HSM) waveform consisting of both pulse amplitude modulation (PAM) and orthogonal frequency division multiplexing (OFDM) samples is further proposed to achieve flexible performance trade-off between communication and sensing in the full-duplex RO-ISAC system. Our experiments successfully demonstrate a RO-ISAC system supporting downlink 125 Mb/s and uplink 12.5 Mb/s full-duplex transmission with a ranging root mean square error less than 4 cm.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 15","pages":"869-872"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144125401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ahmed Bayoumi;Mehmet Oktay;Alaa Elshazly;Hakim Kobbi;Rafal Magdziak;Guy Lepage;Chiara Marchese;Javad Rahimi Vaskasi;Swetanshu Bipul;Dieter Bode;Dimitrios Velenis;Maumita Chakrabarti;Peter Verheyen;Philippe Absil;Filippo Ferraro;Yoojin Ban;Joris Van Campenhout;Wim Bogaerts;Qingzhong Deng
{"title":"Enhanced Operation Range of Silicon MZI Filters Using a Broadband Bent Directional Coupler","authors":"Ahmed Bayoumi;Mehmet Oktay;Alaa Elshazly;Hakim Kobbi;Rafal Magdziak;Guy Lepage;Chiara Marchese;Javad Rahimi Vaskasi;Swetanshu Bipul;Dieter Bode;Dimitrios Velenis;Maumita Chakrabarti;Peter Verheyen;Philippe Absil;Filippo Ferraro;Yoojin Ban;Joris Van Campenhout;Wim Bogaerts;Qingzhong Deng","doi":"10.1109/LPT.2025.3553059","DOIUrl":"https://doi.org/10.1109/LPT.2025.3553059","url":null,"abstract":"Mach-Zehnder interferometers (MZIs) are essential components that are used in a variety of wavelength division multiplexing (WDM) systems. Wavelength-sensitive straight directional couplers (DCs) are usually used as the beam splitter and combiner in traditional waveguide-based MZIs, which often limit the operational bandwidth and cause additional insertion loss. To overcome these challenges, we present an MZI based on bent DCs achieving <inline-formula> <tex-math>$2.7times $ </tex-math></inline-formula> increase in operational wavelength range, expanding the bandwidth from 36.7 nm in straight DC-based MZIs to at least 100 nm, while maintaining a large extinction ratio (ER) <inline-formula> <tex-math>$mathrm {geq 18.4~dB}$ </tex-math></inline-formula>. The proposed MZI is robust across a 300 mm wafer, achieving minimum ER over 100 nm wavelength range of <inline-formula> <tex-math>${mathrm {14.3 }}sim {mathrm {18.4~dB}}$ </tex-math></inline-formula> in all the 63 measured dies, significantly outperforming MZIs based on straight DCs, which exhibit minimum ER of <inline-formula> <tex-math>${mathrm {4.2~ }}sim {mathrm {6.1~dB}}$ </tex-math></inline-formula>. Finally, the proposed MZI is theoretically proven to be highly efficient for more complex WDM systems. Transfer matrix method calculations for 16 −channel MZI-based WDM system demonstrate an improvement of the worst-channel isolation from 5.42 dB to 17.18 dB and the average insertion loss from 1.02 dB to 0.30 dB, as compared to the straight DC based counterpart. This underscores the potential of the proposed MZI to enable scalable and high-performance WDM systems.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 9","pages":"500-503"},"PeriodicalIF":2.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"10-Gb/s NRZ Per Lane Data Links With Transferred Micro-LEDs With Record BER and Energy Efficiency","authors":"Bardia Pezeshki;Alex Tselikov;Rob Kalman;Suresh Rangarajan;Ivan Huang;Jeff Pepper;Sarah Zou;Howard Rourke;Rowan Pocock;Alasdair Fikouras","doi":"10.1109/LPT.2025.3552708","DOIUrl":"https://doi.org/10.1109/LPT.2025.3552708","url":null,"abstract":"We demonstrate the highest data rate links using NRZ modulation of a transferred LED. LEDs transferred onto a sapphire backplane driven by a high-speed external source are modulated at 10Gb/s NRZ for a total extrapolated bandwidth of about 3Tb/s. The transmitters consume ~1pJ/bit with a <inline-formula> <tex-math>$10^{-10}$ </tex-math></inline-formula> BER. Arrays of ~300 GaN microLEDs transferred onto a Si backplane with integrated drivers are modulated at 3.5 Gb/s for a total bandwidth of ~1Tb/s. Such highly parallel optical interconnects have the potential to greatly improve the power consumption and density of chip-to-chip communications.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 8","pages":"453-456"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"High-Sensitivity Optical Fiber Mach-Zehnder Interferometer Sensor Based on Eight-Core Fiber","authors":"Yancheng Ji;Junjie Wang;Jiayi Qian;Yan Wang;Hai Liu;Juan Cao;Dan Sun;Yuechun Shi;Yongjie Yang;Xiaojun Zhu;Wuming Wu","doi":"10.1109/LPT.2025.3552119","DOIUrl":"https://doi.org/10.1109/LPT.2025.3552119","url":null,"abstract":"A high-sensitivity optical fiber curvature sensor based on eight-core fiber (ECF) is proposed and demonstrated. The sensor is fabricated by directly fusing a segment of ECF between two single-mode fibers (SMFs), forming a Mach-Zehnder interferometer (MZI) in an SMF-ECF-SMF structure. Due to the mode field mismatch between ECF and SMF modes, the fundamental mode of SMF is excited to higher-order modes and coupled into ECF to detect the external environment. The cores of the ECF present a <inline-formula> <tex-math>$2times 4$ </tex-math></inline-formula> arrangement, which can play the role of multipath MZI due to the existence of multiple cores. In the curvature detection, the maximum curvature sensitivity of the sensor can be up to −53.32 dB/m−1 within the curvature range of 0.3006 m−1–0.5483 m−1. A wavelength dip with a maximum extinction ratio of 22 dB is obtained in the transmission spectrum, which indicates that the ECF effectively equalizes light energy. In addition, the strain response is also measured. When the strain range changes from 0 to <inline-formula> <tex-math>$900~mu varepsilon $ </tex-math></inline-formula>, the maximum strain sensitivity is −1.83 pm/<inline-formula> <tex-math>$mu varepsilon $ </tex-math></inline-formula>. The proposed sensor, with high sensitivity, simple structure, and good repeatability, has potential applications in many fields, such as medical devices and aerospace.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 8","pages":"445-448"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Kanazawa;N. Watanabe;M. Chen;T. Shindo;W. Kobayashi;Y. Nakanishi;M. Usui;K. Hadama;H. Nakamura
{"title":"226.875-Gbit/s 4-PAM Operation of High-Output Power AXEL Chip on Carrier (CoC)","authors":"S. Kanazawa;N. Watanabe;M. Chen;T. Shindo;W. Kobayashi;Y. Nakanishi;M. Usui;K. Hadama;H. Nakamura","doi":"10.1109/LPT.2025.3552120","DOIUrl":"https://doi.org/10.1109/LPT.2025.3552120","url":null,"abstract":"In this work, we propose a wire interconnection AXEL CoC designed to increase the modulation bandwidth for 200-Gbit/s/<inline-formula> <tex-math>$lambda $ </tex-math></inline-formula> operation and simplify the CoC fabrication process. We first developed an electro-absorption modulator (EAM) that maintains a balance between the extinction ratio and the modulation bandwidth, and then, to increase the modulation bandwidth, we designed a termination circuit that can be integrated with the EAM and the CoC to reduce the bonding wire length. We obtained simulated 3-dB bandwidths of over 80 GHz and over 98 GHz with the longest and shortest bonding wire lengths, respectively. The 3-dB bandwidth of the AXEL CoC was over 95 GHz, which is enough for 226-Gbit/s/<inline-formula> <tex-math>$lambda $ </tex-math></inline-formula> operation. Moreover, under 226.875 Gbit/s 4-PAM operation, the average output power exceeded +9.0 dBm thanks to the integrated SOA in the chip.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 8","pages":"481-484"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Minghua Cao;Lingyun Zhang;Yue Zhang;Shengchun Han;Xia Zhang;Xinhui Shi
{"title":"Optimization of OFDM LiDAR-Communication Integration System Using MIMO and PSO","authors":"Minghua Cao;Lingyun Zhang;Yue Zhang;Shengchun Han;Xia Zhang;Xinhui Shi","doi":"10.1109/LPT.2025.3552608","DOIUrl":"https://doi.org/10.1109/LPT.2025.3552608","url":null,"abstract":"To enhance the anti-interference capability of the orthogonal frequency division multiplexing (OFDM) light detection and ranging (LiDAR)-communication integration system, a multiple input multiple output (MIMO)-OFDM LiDAR-communication integration system is proposed. The system employs MIMO spatial diversity techniques to ensure signal quality and utilizes the particle swarm optimization (PSO) algorithm to optimize the power distribution of LiDAR resource units (RUs). Simulation results demonstrate that, in the <inline-formula> <tex-math>$4times 4$ </tex-math></inline-formula> MIMO configuration, the proposed system achieves a minimum of 7 dB improvement in bit error rate (BER) performance compared to conventional OFDM systems. Additionally, it reduces the peak sidelobe ratio (PSLR) and integrated sidelobe ratio (ISLR) in the range direction by 12.91 dB and 11.92 dB, respectively. Following PSO optimization, the system further decreases the ISLR in the velocity direction by 15.49 dB.","PeriodicalId":13065,"journal":{"name":"IEEE Photonics Technology Letters","volume":"37 12","pages":"655-658"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}