bluuebunny/crossref_metadata_2025 huggingface dataset:
Ultrahigh Speed EA-DFB Lasers beyond 200 Gbps per Lane
Authors: Naoe Kazuhiko
Published: May 2023

We describe 224 Gbps-PAM4 uncooled operation by EA-DFB. Moreover, 330.8-Gbps PAM6 (128-Gbaud PAM6), 384 Gbps PAM8 (128-Gbaud PAM8) and 420 Gbps PAM8 (140-Gbaud PAM8) operations by ultrahigh speed EA-DFB are reviewed.
200G per Lane Uncooled CWDM Hybrid CMBH-Ridge Electroabsorption Modulated Lasers for 2-km Transmission
Authors: Bhasker Prashanth , Arora Sumeeta , Robertson Alex , McCaully Tom , Ni Adrian , Johnson John E.
Published: May 2023

We report uncooled (20-70C) hybrid CMBH-Ridge O-band CWDM EMLs with 60 GHz bandwidth (BW). At 112.5GBd PAM4 and 1.1Vpp, 4 dB extinction ratio (ER) and greater than 7 dBm output power is demonstrated over temperature.
Experimental Demonstration of Optical Modulation Format Identification Using SOI-based Photonic Reservoir
Authors: von Hünefeld Guillermo , Ronniger Gregor , Seker Enes , Thomas Rijil , Safari Pooyan , Sackey Isaac , Khan Md Mahasin , Suckow Stephan , Lemme Max , Stahl David , Schubert Colja , Fischer Johannes Karl , Freund Ronald
Published: May 2023

We experimentally show modulation format identification of optical signals using silicon-on-insulator (SOI) photonic-integrated-circuit-based reservoir. After 100-km SSMF transmission, we achieve identification of 32 GBd 4QAM, 16QAM, 32QAM and 64QAM signals with up to ~97% accuracy.
Programmable tanh- and ReLU-like Optoelectronic Activation Functions for Neuromorphic Photonic Circuits
Authors: Pappas Christos , Kovaios Stefanos , Moralis-Pegios Miltiadis , Tsakyridis Apostolos , Giamougiannis George , Van Kerrebrouck Joris , Coudyzer Gertjan , Yin Xin , Pleros Nikos
Published: May 2023

We demonstrate reconfigurable tanh- and ReLU-like nonlinear activation functions for incoherent neuromorphic photonics using a balanced photodiode assembled with a programmable electronic TIA chip. Experimental results up to 10 Gb/s line-rates are presented.
Demonstration of Optoelectronic-Phased-Array Driven THz-wave Power Combination and Beam Steering
Authors: Che Ming , Kondo Kazuya , Doi Ryo , Kato Kazutoshi
Published: May 2023

We developed a THz-wave power-combination and beam-steering system driven by an optoelectronic phased array. The 300-GHz waves from an antenna-coupled InP/InGaAs UTC-PD array are combined with 16-dB gain and steered continuously over a 30° range.
Optical Synchronization of a Photonic Crystal Resonator to a 10 GHz Chip-Scale Mode-Locked Laser PIC
Authors: Shirpurkar Chinmay , Zang Jizhao , Carlson David , Briles Travis , Papp Scott B. , Delfyett Peter J.
Published: May 2023

We present an optical frequency division technique to transfer the timing stability of a stabilized Photonic Crystal Resonator Comb (~200 GHz repetition rate) to a chip-scaled mode-locked laser (~10 GHz repetition rate).
Optical Clock Synchronization for O-band Directly Modulated Laser Based Data Center Interconnection
Authors: Zhou Zichuan , Clark Kari , Verma Ashish , Matsui Yasuhiro , Liu Zhixin
Published: May 2023

We show that clock synchronized transmission has reduced receiver-side jitter that limits DMLs’ performance compared to conventional clock and data recovery. We access transmission quality using 35-GHz-bandwidth DMLs at 1271 and 1373 nm.
A Hybrid Solid-State Beam Scanner for FMCW LiDAR Application
Authors: Zhang Zhaoyang , Du Xufeng , Zhou Zhiyan , Huang Qikai , Zhang Qiang , Dai Tingge , Yu Hui , Wang Yuehai , Yang Jianyi
Published: May 2023

We demonstrate a hybrid solid-state beam scanner based on a Si3N4 switching array. Two-dimensional beam steering with a 14.3°x9.9°field of view and FMCW ranging operation at a distance of 7.4 m are achieved.
Impact of Laser Phase Noise on Ranging Precision Within and Beyond Laser Coherence Length in FMCW LiDAR
Authors: Yi Wenting , Zhou Zichuan , Liu Zhixin , Bayvel Polina , Killey Robert I.
Published: May 2023

We study the impact of laser phase noise on ranging precision in a frequency-modulated continuous-wave (FMCW) LiDAR system, demonstrating ranging of 384.72 m with ~ 15 cm precision at 7 × intrinsic laser coherence length.
An Intelligent Optical Telemetry Architecture
Authors: Velasco Luis , González Pol , Ruiz Marc
Published: May 2023

A distributed telemetry system is proposed with agents receiving and analyzing data before sending to a centralized manager. Intelligent data aggregation on optical constellations telemetry largely reduces data rate without introducing significant error.
A method for differential modal delay reduction by using curvature of few-mode optical fiber in high-density cable
Authors: Kikuchi Masashi , Mori Takayoshi , Yamada Yusuke
Published: May 2023

We propose a method of controlling the differential modal delay of 2LP-mode graded- index fiber by using the curvature of fiber in high-density cable. The method achieved a 50% reduction in the C-L band.
Processing and Applications of Semiconductor Core Fibers
Authors: Gibson Ursula
Published: May 2023

Optical fibers with semiconducting cores permit transmission of signals from the visible to THz wavelengths, and devices can utilize the large nonlinear coefficients of the core materials. Fabrication, post-processing, properties and devices are reviewed.
100 Gbps/λ Transmission with Quantum Dot O-Band Comb Source using 50 GBd PAM4/16QAM-OFDM Signals
Authors: Venkatasubramani Lakshmi Narayanan , Xu Haixuan , Buyalo Mikhail , Gubenko Alexey , Yu Yonglin , Barry Liam
Published: May 2023

We demonstrate a record high transmission rate of 100 Gbps/λ with 50 GBd PAM4 and 16QAM-OFDM signals using a packaged wavelength-tunable InAs/InGaAs quantum dot-based laser comb source for short-reach application. We successfully show the performance is within the standard FEC limits.
A Kind of Low-modal-crosstalk Mode DEMUX for Stable DSP-free IM/DD MDM Transmission
Authors: Cui Jian , Gao Yuyang , Huang Shuailuo , Yu Jinyi , Shen Lei , Zhang Lei , Yan Changkun , Yang Liubo , Wang Ruichun , He Yongqi , Chen Zhangyuan , Li Juhao
Published: May 2023

A low-modal-crosstalk 4-LP-mode demultiplexer with orthogonal combiner for degenerate mode reception is designed and fabricated by side-polishing processing, based on which DSP-free IM/DD MDM-WDM transmission over 20-km weakly-coupled FMF are experimentally demonstrated.
Free-Space Visible Light Communication with Downstream and Upstream Transmissions Supporting Multiple Moveable Receivers Using Light-Diffusing Fiber
Authors: Chang Yun-Han , Chow Chi-Wai , Wang Chih-Chun , Jian Yin-He , Gunawan Wahyu Hendra , Liu Yang , Yeh Chien-Hung
Published: May 2023

We demonstrate a free-space bi-directional visible-light-communication (VLC) system using a light-diffusion-fiber (LDF) optical antenna. It allows 360o field-of-view (FOV) noncontact and moveable VLC detection, achieving 210-Mbit/s downlink and 850-Mbit/s uplink transmissions.
Cost-effective Network Capacity Enhancement with Multi-band Virtual Bypass Links
Authors: Saito Daisuke , Mori Yojiro , Hosokawa Kohei , Yanagimachi Shigeyuki , Hasegawa Hiroshi
Published: May 2023

A cost-effective network expansion method through the use of virtual links in which multi-band transmission is introduced. Network capacity enhancement reaches over 10% just with the introduction of a few virtual links on each topology.
Architecture and Performance Evaluation of Bundled-path-routing Multi-band Optical Networks
Authors: Munakata Ryuji , Kuno Takuma , Mori Yojiro , Lin Shih-Chun , Matsuura Motoharu , Subramaniam Suresh , Hasegawa Hiroshi
Published: May 2023

We propose a novel bundled-path-routing node architecture for multi-band optical networks and a network design algorithm based on graph degeneration. Feasibility is demonstrated through experiments on a prototype with 300.8 Tbps throughput.
Wafer scale Ge-on-Si metalens for the mid-infrared
Authors: Zhou Yanyan , Zhong Qize , Ren Zhihao , Tobing Landobasa Y. M. , Fu Yuan Hsing , Ang Rachel , Li Bo , Zhou Hong , Lee Chengkuo , Lee Lennon Y. T.
Published: May 2023

We report the first demonstration of metalens devices fabricated on an 8-inch Ge-on-Si wafer for the mid-infrared regime. Experimental observations of beam focusing show good match with the design.
Tutorial on Silicon Photonics Applications
Authors: Akiyama Tomoyuki
Published: May 2023

This tutorial reviews history of silicon photonics from early-stage proof of concept to recent diverging applications based on large-scale integration, covering breakthrough technologies and key future prospects.
C- and L-band low polarization sensitive nanosecond 1×2 electro-optic MZI switch on 3-µm thick silicon platform
Authors: Wang Yu , Bhat Srivathsa , Shi Bin , Aalto Timo , Calabretta Nicola
Published: May 2023

We fabricated and assessed a wideband (C-/L- band) nanosecond 1×2 electro-optic switch in 3-µm thick silicon. Results show 2.5dB lowest insertion loss, 16dB averaged extinction ration, 2.5dB polarization dependent loss and 6-ns switching time.
Core-Selective Switch for SDM Network based on LCPG and MEMS technology
Authors: Kuno Yuki , Kawasugi Masahiro , Hotta Yuji , Otowa Ryohei , Mizoguchi Makoto , Sakurai Yasuki
Published: May 2023

We propose a core selective switch (CSS) with VOA function utilizing liquid crystal polarization grating and MEMS technology. The prototype of 19-core 1×8 CSS showed an attenuation of 19.5 dB with more than 35 dB optical crosstalk.
Automatic In-situ Optical Linearization of Silicon Photonic Ring-Assisted MZ Modulator for Integrated RF Photonic SoCs
Authors: Shawon Md Jubayer , Saxena Vishal
Published: May 2023

We experimentally demonstrate automatic optical linearization of a Ring Assisted MZ modulator with SFDR > 110dB.Hz2/3, fabricated in a silicon photonic foundry process. The linearization algorithm reconfigures the modulator to its optimum SFDR or other desired regimes regardless of random phase offsets and process/temperature variations.
Design and applications of Highly nonlinear fibers
Authors: Sugizaki Ryuichi , Takahashi Masanori , Takasaka Shigehiro , Kimura Toshio
Published: May 2023

Highly nonlinear fibers which can be utilized in all-optical signal processing is introduced. Characteristics of highly nonlinear fiber and requirements from various applications are summarized.
Mid-Span Pump Phase Shift Applied to WDM Wavelength Conversion for the Suppression of FWM Crosstalk
Authors: Bottrill K.R.H. , Taengnoi N. , Liu H. , Petropoulos P.
Published: May 2023

We apply mid-span pump-phase shifting to the wavelength conversion of a 9 channel WDM band in order to suppress inter-channel nonlinear crosstalk. SNR improvements between 3-6dB are observed through the use of the technique.
High-efficiency Microcombs Aligned with ITU-T Grid for WDM Optical Interconnects
Authors: Zang Jizhao , Yu Su-peng , Carlson David R. , Briles Travis C. , Jin Yan , Papp Scott B.
Published: May 2023

We report generation of flat soliton microcombs aligned with ITU-T grid. We demonstrate close to 70% pump-to-comb conversion efficiency and the required on-chip pump power is below 40 mW.
1.96Tbps and 256-Gbaud Dual-carrier Faster than Nyquist Signal Transmission Using Two Narrow-bandwidth Modulators and Single Coherent Receiver
Authors: Huang Guoxiu , Nakashima Hisao , Matsui Jun , Sobu Yohei , Tanaka Shinsuke , Hoshida Takeshi
Published: May 2023

A large capacity system basing on Faster-than-Nyquist technologies using narrow-bandwidth components was experimentally demonstrated with a hybrid of simple transmitter DSP and optical-equalization for an efficient spectrum-shaping to achieve 1.96Tbps net rate over 120km transmission.
Demonstration of Wireless Transmission of QPSK Signals at 2 THz
Authors: Morohashi Isao , Irimajiri Yoshihisa , Kawakami Akira , Kishimoto Tadashi , Dat Pham Tien , Kanno Atsuhi , Sekine Norihiko , Hosako Iwao
Published: May 2023

Wireless transmission of QPSK signals at 2 THz has been demonstrated using modulator-based optical combs for the transmitter and hot electron bolometer mixers combined with phase-locked terahertz quantum cascade lasers for the receiver.
Transfer Learning-based ROADM EDFA Wavelength Dependent Gain Prediction Using Minimized Data Collection
Authors: Wang Zehao , Kilper Dan , Chen Tingjun
Published: May 2023

We implement and test transfer learning-based gain models across 16 ROADM EDFAs, which achieve less than 0.17/0.30 dB mean absolute error for booster/pre-amplifier gain prediction using only 0.5% of the full target EDFA dataset.
Nonlinear Optical Loop Mirror for Waveband-Shift Free Optical Phase Conjugation
Authors: Gordienko Vladimir , Bastamova Mariia , Ellis Andrew , Doran Nick
Published: May 2023

We experimentally demonstrate waveband-shift free optical phase conjugation by recombining signals and idlers at different output ports of a nonlinear optical loop mirror with idler-to-signal extinction ratio up to 18dB.
Confidential Detection of Multiple Failures in Optical Networks: an Experimental Evaluation
Authors: Silva M. F. , Sgambelluri A. , Pacini A. , Paolucci F. , Green A. , Mascarenas D. , Valcarenghi L.
Published: May 2023

This paper presents a Machine Learning technique based on Principal Component Analysis (PCA) combined with telemetry data scrambling to detect multiple types of failure in optical networks while preserving data confidentiality. Experiments in an optical testbed show the effectiveness of the proposed solution.
Multi-node Cooperative Recovery against IP node failure Enabled by Flexible Optical Network
Authors: Li Yunxuan , Gu Rentao , Ji Yuefeng
Published: May 2023

We propose a multi-node cooperative recovery method against IP node failure through joint selection and flow table splitting. The recovery time saves by 89.5%, and the success rate improves by 25.6% in heavily loaded network.
Maximizing 425G SWDM VCSEL-MMF Systems Reach Through Variable Rate per λ
Authors: Brusin A.M. Rosa , Nespola A. , Rizzelli G. , Aquilino F. , Forghieri F. , Carena A.
Published: May 2023

We demonstrate the maximization of reach for 425G SWDM systems based on VCSEL-MMF links through variable rate solutions, reaching up to >100 m for 99% of tested links.
Polarization mode dispersion in CMOS-integrated monolithic SiPh components: simulations and experiments
Authors: Bian Yusheng , Ding Hanyi , Aboketaf Abdelsalam , Karra Vaishnavi , Sorbara Massimo , Hirokawa Takako , Mosleh Salman , Hedges Chrystal , Lee Won Suk , Chandran Sujith , Chatterjee Avijit , Nandi Riddhi , Giewont Ken , Nummy Karen , Gabbay Alon , De Koninck Yannick , Verbist Jochem , Echeverri Santiago , Gantz Liron , Liu Qidi , Logan Dylan , Jafari Omid , Murray Kyle , Huante-Ceron Edgar , Roy Subharup , Webster-Pact Paul , Rakowski Michal , Dezfulian Kevin K. , Stricker Andy , Houghton Thomas , Donegan Keith , Sporer Ryan , Cho Jae Kyu , Barakat Farid , Moy Dan , Wu Zhuo-Jie (George) , Krishnamurthy Subramanian , Najafi Arman , Banihashemian Seyedeh Fahimeh , Mincar Rick , Sirdeshmukh Ranjani , Robson Norm , Melville Ian , Augur Rod , Lee Jae Gon , Lin Wenhe , Gifford George , Fox Robert , Gupta Vikas , Yu Anthony , Pellerin John , Letavic Ted
Published: May 2023

We simulated and experimentally characterized the differential group delay induced from polarization mode dispersion (PMD) of key components on a monolithic SiPh platform. Strategy for compensating PMD was introduced for high-speed applications beyond 100 Gbit/s.
Adaptive Turbo Equalization of Probabilistically Shaped Constellations
Authors: Silva Edson Porto da , Yankov Metodi Plamenov
Published: May 2023

Fiber nonlinearity compensation of probabilistically shaped constellations with adaptive turbo equalization is investigated for the first time. Potential for more than 100% transmission reach extension is demonstrated by combining probabilistic shaping, single-channel digital backpropagation, and adaptive turbo equalization.
Automatic Tuning of Vernier Microring Filters Using Comprehensive Characterization Models and Hybrid Optimization Algorithms
Authors: Alnairat Saif , Wohlfeil Benjamin , Djordjevic Stevan , Schmauss Bernhard
Published: May 2023

An efficient approach to automatically configure and tune Vernier microring filters by utilizing hybrid optimization algorithms and robust characterization models is presented. Automatic tuning of a four-ring Vernier filter over the entire C-band is experimentally demonstrated to evaluate this method.
Phase locking of an Optical Injection Phase-lock Loop coherent receiver under emulated atmospheric fading conditions
Authors: Bernini Alexis W. , Fice Martyn J. , Balakier Katarzyna
Published: May 2023

An Optical Injection Phase-Lock Loop coherent receiver has been tested against various levels of deep atmospheric fading to experimentally evaluate its feasibility in a ground-to-satellite optical communications application.
Experimental evaluation of MPI noise mitigation effects for various modulation schemes in analog IFoF-based mobile fronthaul link
Authors: Ochi Hirotaka , Tanaka Kazuki , Nimura Shinji , Nishimura Kosuke , Inohara Ryo , Suzuki Masatoshi
Published: May 2023

Effects of multipath interference (MPI) mitigation for different modulation schemes in analog IFoF link is experimentally evaluated. The results show phase-dithered and polarization-scrambled IFoF signal could tolerate 30-dB MPI for two types of external modulations.
Low Insertion Loss 128-Gbaud HB-CDM with 3D-Printed Spot Size Converter Integrated InP-based Modulator
Authors: Mizuno Yasutaka , Kurokawa Munetaka , Itabashi Naoki , Misawa Taichi , Takechi Masaru , Uemura Hiroshi , Tanaka Hajime , Ishikawa Tsutomu , Saeki Tomoya , Tanaka Keiji , Kato Takatoshi , Shiozaki Manabu , Uesaka Katsumi
Published: May 2023

We demonstrate 128 Gbaud HB-CDM with InP-based modulator having 3D-printed SSCs on chip facet. Optical coupling loss of 1.1 dB and Telcordia compliant reliability promise practical usage of 3D-print technology based on two photon polymerization.
27Hz Integral Linewidth Laser Based on a 5-billion Q Microfabricated Reference Cavity
Authors: Isichenko Andrei , Feng Flame , Jin Naijun , Liu Kaikai , Harrington Mark W. , Rakich Peter T. , Blumenthal Daniel J.
Published: May 2023

We stabilize a semiconductor laser to a manufacturable, microfabricated micro-Fabry-Perot dielectric reference cavity of 5 billion quality factor, achieving thermorefractive-noise-limited performance. A 27 Hz 1/π integral linewidth and 1.5×10-13 fractional frequency stability are measured.
Dispersion-Engineered and Fabrication-Robust SOI Waveguides for Ultra-Broadband DWDM
Authors: Wang Yuyang , Wang Songli , Novick Asher , James Aneek , Parsons Robert , Rizzo Anthony , Bergman Keren
Published: May 2023

We present a measurement-validated design methodology for engineering the width of silicon-on-insulator waveguides for co-optimized group velocity dispersion and fabrication robustness, paving the way for ultra-broadband dense wavelength-division multiplexing silicon photonic communication solutions.
Multifunctional Anisotropic Thermo-Optic Mach-Zehnder Interferometer on LNOI
Authors: Song Lijia , Liu Weixi , Li Huan , Shi Yaocheng , Dai Daoxin
Published: May 2023

Harnessing the strong anisotropy of lithium niobate, we have proposed a multifunctional thermo-optic Mach-Zehnder interferometer on x-cut LNOI and experimentally demonstrated its versatile configurations as a polarization-insensitive switch and a polarization beam splitter.
Silicon Photonics for Next-Generation Optical Connectivity
Authors: Liao Ling , Fathololoumi Saeed , Nguyen Kimchau , Mahalingam Hari , Hui David , Heck John , Frish Harel , Defrees Reece , Malouin Christian , Seddighian Pegah , Huang Mengyuan , Al-hemyari Kadhair , Chen Yen-Jung , Wang Ye , Lin Wenhua , Zhu Daniel , Jones Richard , Akulova Yuliya , Liljeberg Thomas
Published: May 2023

We review advancements in silicon photonic (SiPh) devices and integrated circuits (SiPICs) to enable high density, low power, multi-Tb/s optical solutions for next-generation Ethernet networking and compute connectivity.
Single Lane 330 Gb/s Silicon Photonic Microring Modulator with sub 2 Vpp Driving Voltage
Authors: Chan David W.U , Wu Xiong , Lau Alan Pak Tao , Lu Chao , Tsang Hon Ki
Published: May 2023

We present the first silicon photonic microring modulator operating at up to 330 Gb/s. The modulator can support PAM-8 with driving voltage under 2 Vpp in C-band using a polynomial nonlinear equalizer.
Erbium-Doped Fiber Amplifier with Extended L-Band Gain to 1625 nm
Authors: Zhai Ziwei , Halder Arindam , Sahu Jayanta K.
Published: May 2023

We report a double-pass L-band erbium-doped fiber amplifier providing ≥20dB gain from 1565-1625nm, with 46dB maximum gain at 1600nm. At 1625nm, the NF, OSNR, gain coefficient, and temperature-dependent-gain-coefficient were 7.2dB, 25dB, 0.045dB/mW, and -0.037dB/oC, respectively.
Programmable Photonic Neural Networks for advanced Machine Learning tasks
Authors: Totović Angelina , Tsakyridis Apostolos , Giamougiannis George , Moralis-Pegios Miltiadis , Tefas Anastasios , Pleros Nikos
Published: May 2023

Photonics holds the promise of reshaping Machine Learning and High-Performance Computing hardware landscape, stripping it of unnecessary signal conversion overhead, complying with strict power dissipation envelopes while unlocking unrivaled compute and bandwidth capacity.
Mode Vector Modulation: Optimal Signal Sets With Geometric Shaping
Authors: Roudas I. , Fink E. , Kwapisz J.
Published: May 2023

For mode vector modulation, used in conjunction with direct-detection, we present geometrically-optimized signal sets that correspond to the densest sphere packing in the generalized Stokes space. We show that the best trade-off between spectral and energy efficiency occurs for simplex constellations.
C-band 100 Gb/s Transmission over 40 km SSMF Using a Silicon Photonic Vestigial Sideband Transmitter Based on Dual-Drive MZM and Passive Optical Delay Line
Authors: Berikaa Essam , Alam Md Samiul , Hu Yixiang , Li Weijia , Plant David V.
Published: May 2023

We demonstrate a filter-free silicon photonic VSB transmitter, enabling the C-band transmission of 56 Gbaud PAM4 over 40 km of dispersion-uncompensated SSMF under the 6.7% overhead HD-FEC with a single DAC channel and non-linear equalization.
38.4-Tbps Inline-amplified Transmission Using PPLN-based Optical Parametric Amplifier over 6 THz within L- and U-bands
Authors: Shimizu Shimpei , Kobayashi Takayuki , Kawai Akira , Kazama Takushi , Nakamura Masanori , Enbutsu Koji , Kashiwazaki Takahiro , Abe Masashi , Umeki Takeshi , Miyamoto Yutaka , Kato Tomoyuki , Tanaka Yu , Hoshida Takeshi
Published: May 2023

We demonstrate a 5×80-km WDM transmission over 6 THz within 1597.19–1649.93 nm. PPLN-based optical parametric amplifiers provide sufficient gain for inline amplification of 60-channel 640-Gbps/λ signals allocated in L- and U-bands.
Modeling and Optimization of Experimental S+C+L WDM Coherent Transmission System
Authors: Escobar-Landero Salma , Zhao Xiaohui , Lorences-Riesgo Abel , Le Gac Dylan , Frignac Yann , Charlet Gabriel
Published: May 2023

Using accurate ISRS GN modeling and the fast-converging ASE-NL optimization algorithm, we demonstrate 6.2 Tbit/s throughput improvement in a 2-span ultra-wide-band system thanks to the use of the predicted total and per channel power.
Thin-film BTO-based modulators enabling 200 Gb/s data rates with sub 1 Vpp drive signal
Authors: Eltes Felix , Li Weijia , Berikaa Essam , Alam Md Samiul , Bernal Santiago , Minkenberg Cyriel , Plant David V. , Abel Stefan
Published: May 2023

We demonstrate BTO-enhanced silicon photonics enabling compact, low-loss modulator PICs delivering net PAM4 data rates below HD-FEC threshold of 200 Gb/s in a driver-less setup with linear Rx DSP, at 9 fJ/bit electrical power dissipation.
Silicon Photonics for High-Speed 5G and Optical Networks
Authors: Rusch Leslie A. , Guan Xun
Published: May 2023

Optical fronthaul for radio access networks will enable the promise of 5G and beyond. We describe how centralized sources and diminutive microring modulators can meet these goals while also reducing footprint and power consumption.
Optimal Line-Rates for IP-over-DWDM in Metro and Core Networks: Comparison of ZR+ and Xponder Architectures
Authors: Gumaste Ashwin , Pedro Joao , Momtahan Paul , Bock Harald
Published: May 2023

With the advent of pluggable ZR/ZR+ and embedded optics at 400Gb/s and beyond, we consider optimal network architectures and line-rates in access, metro and core networks. Simulations across a US-core network are demonstrated.
Clustering-based dynamic bandwidth allocation for point-to-multipoint coherent optics
Authors: Hernández J. A. , Arpanaei F. , Martínez G. , de Dios Ó. González , Fernández-Palacios J. P. , Napoli A.
Published: May 2023

This article introduces a modified version of clustering techniques that can be applied in traffic aggregation for point-to-multipoint optical network architectures employing digital subcarrier multiplexing. The algorithm dynamically assigns individual subcarriers to nodes with uncorrelated traffic profiles.
Field Trial of FPGA-Based Real-Time Sensing Transceiver over 524 km of Live Aerial Fiber
Authors: Mazur Mikael , Wallberg Dennis , Dallachiesa Lauren , Börjeson Erik , Ryf Roland , Bergroth Magnus , Josefsson Börje , Fontaine Nicolas K. , Chen Haoshuo , Neilson David T. , Schröder Jochen , Larsson-Edefors Per , Karlsson Magnus
Published: May 2023

We perform fiber sensing over a 524 km live network using a real-time coherent transceiver prototype. Polarization and length changes from the link consisting exclusively of aerial fiber wound around high-voltage power cables are continuously monitored.
Net 100 Gb/s/λ VCSEL+MMF nonlinear Digital Pre-Distortion using Convolutional Neural Networks
Authors: Minelli Leonardo , Forghieri Fabrizio , Shao Tong , Shahpari Ali , Gaudino Roberto
Published: May 2023

We experimentally demonstrate VCSEL+MMF nonlinear Digital Pre Distorters, optimized using Convolutional Neural Networks, for fulfilling the IEEE P802.3dbTM/D3.2 TDECQ requirements for net 100 Gb/s/λ optical transmitters.
128-Gbaud PAM4 O-Band Transmission Using Advanced MLSE with Simple LLR Calculation for SD-FEC Scheme
Authors: Yamamoto Shuto , Taniguchi Hiroki , Masuda Akira , Nakamura Masanori , Kisaka Yoshiaki
Published: May 2023

We propose simple methods to calculate LLR for IM-DD system with MLSE and SD-FEC and show that an advanced MLSE with the LLR calculation methods makes NGMI higher in 128-Gbaud PAM4 in 20-GHz bandwidth limitation.
190 GHz Bandwidth Modified Uni-Traveling Carrier Photodiodes with High Saturation Power
Authors: Tian Yuxin , Xiong Bing , Sun Changzheng , Hao Zhibiao , Wang Jian , Wang Lai , Han Yanjun , Li Hongtao , Gan Lin , Luo Yi
Published: May 2023

Back-illuminated modified uni-traveling carrier photodiodes with improved saturation performance at ultra-high frequencies are developed. The 4-µm-diameter PD exhibits a 3-dB bandwidth of 190 GHz with a saturation power of ‐1.21 dBm@190 GHz.
Distributed Polarization and Coupling Analysis of a 3-Coupled-Core Fiber
Authors: Cappelletti Martina , Orsuti Daniele , Veronese Riccardo , Fontaine Nicolas K. , Ryf Roland , Mazur Mikael , Chen Haoshuo , Santagiustina Marco , Galtarossa Andrea , Palmieri Luca
Published: May 2023

OFDR-based, distributed characterization of polarization and coupling properties of a 3-coupled-core fiber is reported. Results highlight the beating among the supermodes of the fiber, enabling the evaluation of their polarization and modal birefringence.
Distributed Characterization of Low-loss Hollow Core Fibers using EDFA-assisted Low-cost OTDR instrument
Authors: Wei Xuhao , Shi Bo , Richardson David J. , Poletti Francesco , Slavik Radan
Published: May 2023

We use a low-cost commercially-available Optical Time Domain Reflectometer (OTDR). Sensitivity is boosted by 28 dB using two EDFAs, enabling characterization with spatial resolution of 1.5 m, which is 10 times better than previously reported.
First Field Trial of FTTR Based on Native Management and Control Architecture for 5G Small Cell Backhaul
Authors: Zhu Jinglong , Li Junwei , Zhang Nannan , Wang Ning , Zhang Dechao , Li Han , Duan Xiaodong , Wu Xuming , Bai Lirong
Published: May 2023

We firstly propose a native management and control architecture of FTTR, based on which a field trial for 5G small cell backhaul is demonstrated. The download speed of each user equipment reaches nearly 800 Mbps.
Nonlinear Distortion Mitigation with Non-Orthogonal DFT-precoding for DML-Based OFDM Optical Systems
Authors: Song Peiji , Hu Zhouyi , Dai Yizhan , Chan Chun-Kit
Published: May 2023

We propose to use non-orthogonal DFT-matrix precoding to mitigate the nonlinear distortion induced by chirp and fiber dispersion in a 10-Gb/s DML-based OFDM optical system, with 0.83-dB sensitivity improvement over the third-order Volterra nonlinear equalizer.
Delay Compensated Quad-level Delta-sigma Modulation Dual-color DRoF System for Beyond 5G Mobile Fronthaul
Authors: Weng Zu-Kai , Dat Pham Tien , Kanno Atsushi , Kawanishi Tetsuya , Akahane Kouichi
Published: May 2023

We demonstrated a high-performance dual-color B5G DRoF system using delay compensation. A quad-level 6-Gbit/s 64-QAM OFDM signal was successfully transmitted over the proposed system, showing a much better performance compared to the conventional 1-bit system.
Receiver Noise Stability Calibration for CV-QKD
Authors: van der Heide Sjoerd , Frazão João , Albores-Mejía Aaron , Okonkwo Chigo
Published: May 2023

A method to investigate CV-QKD receiver stability is proposed and experimentally validated. Comparing <100 kHz linewidth local oscillator lasers, we show long-term noise power variance differs more than tenfold, highlighting the importance of receiver hardware calibration.
Software-Defined Quantum Network Using a QKD-Secured SDN Controller and Encrypted Messages
Authors: Tessinari R. S. , Woodward R. I. , Shields A. J.
Published: May 2023

We propose and implement a software-defined network architecture that integrates the QKD SDN Controller within the QKD node, enabling it to use quantum keys to secure its communication with SDN agents while optimizing QKD-keys consumption.
Inverse-Designed Grating Arrays for High-Sensitivity Plenoptic Time-of-Flight Pixels
Authors: Rollinson John , Karlicek Robert , Hella Mona
Published: May 2023

We present a plenoptic time-of-flight pixel design using grating arrays with inverse-designed passive photonic power combining to achieve scalable signal-to-noise ratio. Experimental results are presented as a proof-of-principle demonstration of the pixel architecture.
On-Chip Tunable Mode-Locked Comb Laser in Generic Foundry Platform
Authors: Lo Mu-Chieh , Bennett Alex , Zhou Zichuan , Ruocco Alfonso , Liu Zhixin
Published: May 2023

An integrated, passive, harmonically mode-locked laser fabricated utilizing a generic integration technology is reported. The device features both emission wavelength and comb spacing variability by using a colliding-pulse cavity composed of two tunable gratings.
A Low-latency DSM-based ONU Activation Scheme for In-service TDM-PON without Quiet Windows
Authors: Zou Yang , Li Borui , Zhong Linsheng , Zhang Shenmao , Dai Xiaoxiao , Cheng Mengfan , Deng Lei , Yang Qi , Liu Deming
Published: May 2023

An activation method using DSM generated electrical tone as the identity of joining ONUs is proposed. The activation requests can be detected and distinguished without a quiet window or degradation on the upstream traffic.
Deep Reservoir Computing for 100 Gbaud PAM6 IM/DD Transmission Impairment Mitigation
Authors: Han Mengyao , Wang Muguang , Fan Yuchuan , Salgals Toms , Louchet Hadrien , Schatz Richard , Gruen Markus , Pittala Fabio , Krüger Benjamin , Dippon Thomas , Zhang Lu , Yu Xianbin , Spolitis Sandis , Bobrovs Vjaceslavs , Popov Sergei , Pang Xiaodan , Ozolins Oskars
Published: May 2023

We experimentally evaluate a deep Reservoir Computing (RC)-based post-equalization for 100 Gbaud PAM6 IM/DD transmissions. It achieves ~1 dB higher sensitivity than DFE, and ~50% implementation complexity reduction compared with the conventional RC configuration.
PS factor-independent and joint polarization, frequency offset and carrier phase recovery scheme for probabilistically shaped QAM
Authors: Fan Linsheng , Yang Yanfu , Gong Siyu , Chen Yong , Yao Yong
Published: May 2023

A joint polarization, frequency offset and carrier phase recovery scheme based on frequency domain pilot is proposed for PS-QAM. Our scheme is independent of PS factor and can track polarization rotation rate up to 20Mrad/s.
Dependence of Raman Scattering in a Few-Mode Fiber Within Small Detuning Range
Authors: Cheng Hongtao , Zhu Shengjie , Cui Liang , Li Xiaoying
Published: May 2023

We measure the intensity of small detuning Raman scattering in different spatial and polarization mode in a common circular core few-mode fiber, and show the existence of principle mode affect the dependence of Raman scattering.
DSP-enhanced Radio-over-fiber Xhaul Networks Toward Beyond-5G
Authors: Zhu Paikun , Yoshida Yuki , Kanno Atsushi , Akahane Kouichi , Kitayama Ken-ichi
Published: May 2023

We review recent progress on candidate DSP-enhanced radio-over-fiber techniques for Xhaul networks targeting 5G and beyond. Low-latency real-time link and layer-2 networking demonstrations will be discussed.
High-speed and energy-efficient non-volatile memristive III-V-on-silicon photonic phase shifter
Authors: Fang Zhuoran , Tossoun Bassem , Descos Antoine , Liang Di , Huang Xue , Kurczveil Geza , Majumdar Arka , Beausoleil Raymond G.
Published: May 2023

We demonstrated a non-volatile III-V-on-silicon photonic phase shifter based on HfO2 memristor with ~400 fJ switching energy, 100 ns switching speed, and an excellent endurance of over 800 cycles.
Real-Time Point-to-Multipoint for Coherent Optical Broadcast and Aggregation – Enabled by Digital Subcarrier Multiplexing
Authors: Rashidinejad Amir , Yekani Amin , Eriksson Tobias A. , Napoli Antonio , Maher Robert , Kakkar Aditya , Dominic Vince , Duthel Thomas , Missey Mark , Samra Parmijit , Pavinski Don , Evans Peter , Sande Warren , Torbatian Mehdi , Fludger Chris , Sun Han , Ziari Mehrdad , Masoud Fady , Somani Azmina , Welch Dave
Published: May 2023

We report on the first real-time operation of coherent point-to-multipoint in high-speed fiber-optic communications. The broadcast and aggregation network consists of a 400 Gb/s hub transceiver achieving post-FEC error-free communication with 4×100 Gb/s leaf nodes, 5 – 50 km away.
100-Gbps 2-SDM 2-WDM FSO beam direct detection using resonant cavity 4x4 photodetector array
Authors: Umezawa T. , Matsumoto A. , Akahane K. , Kanno A. , Yamamoto N.
Published: May 2023

We fabricated a high-speed resonant cavity 4x4 photodetector array, which has two functions for high optical alignment robustness and specific wavelength selection. In the 2-SDM 2-WDM FSO communication, 100-Gbps high data rate was successfully demonstrated.
Practical Considerations on using Gaussian Shape Pulses in phi-OTDR Systems
Authors: Maia Felipe , Mariz de Carvalho Pedro O. , Barcelos Sérgio , Herrera Luis Ynoquio
Published: May 2023

This paper experimentally demonstrates practical advantages and limitations on using Gaussian shape pulses for phi-OTDRs systems by measuring the SNR of the detected vibration in the far end of a standard single mode fiber.
Integrated Antenna Modules for Photonic RF Sensing and Communications
Authors: Waterhouse R. B. , Novak D.
Published: May 2023

In this paper we present some recent advancements in antenna/photonic device integration for radio? over fiber applications. In our direct integration investigations we divide our approach based on frequency bands; below 6 GHz and above 26 GHz (Ka-band) to be consistent with such applications as present day 5G and 5G+ systems.
Is Intelligence the Answer to Deal with the 5 V’s of Telemetry Data?
Authors: Velasco L. , Barzegar S. , Ruiz M.
Published: May 2023

Telemetry data and big data share volume, velocity, variety, veracity and value characteristics. We propose a distributed telemetry architecture and show how intelligence can help dealing with the 5 V’s of optical networks telemetry data.
Direct Intensity Detection of Complex Communication Data Signals Using a Real-time Photonics Spectrogram
Authors: Rowe Connor M.L. , Crockett Benjamin , Azaña José
Published: May 2023

We use a time-lens spectrogram for real-time recovery of complex modulation data signals using a single photodiode, no local oscillator, and simple decision method. Our proof-of-concept experiment decodes QAM4 and QAM8 under the FEC limit.
A method to compute the local birefringence vector in twisted and bent antiresonant hollow-core fibers
Authors: Guerra Gianluca , Mousavi Seyed Mohammad Abokhamis , Taranta Austin , Fokoua Eric Numkam , Santagiustina Marco , Galtarossa Andrea , Poletti Francesco , Palmieri Luca
Published: May 2023

This work proposes a technique to elucidate mode coupling when antiresonant fibers are twisted and bent. From this, we show how the birefringence of a nested antiresonant nodeless fiber changes as function of the deployment.
Estimation of Kerr Nonlinearity in an Anti-resonant Hollow-Core Fiber by High-order QAM Transmission
Authors: Ge Dawei , Gao Shoufei , Zuo Mingqing , Gao Yuyang , Wang Yinging , Yan Baoluo , Ye Bing , Zhang Dechao , Ding Wei , Li Han , Chen Zhangyuan
Published: May 2023

We propose a novel technique to measure Kerr nonlinearity in a hollow-core fiber based on nonlinear phase shift estimation by high-order QAM transmission. The measured n2,Kerr of the NANF-5 medium is <2.20×10-23 m2/W.
Demonstration of real-time receiver for 30-GBaud PAM-6 signal in IM/DD system
Authors: Zhang Shenmao , Dai Xiaoxiao , Chen Zhuo , Yang Qi , Liu Chen , Deng Lei , Cheng Mengfan , Liu Deming
Published: May 2023

Using baud-rate timing recovery algorithm and a simple blind synchronization method, we experimentally demonstrate a real-time reception of 30-GBaud 6-level pulse amplitude modulation (PAM-6) signal with a baud-rate analog-to-digital converter (ADC).
Inter-Channel FWM Mitigation Techniques for O-band WDM Based 800G/1.6T LR and 5G Fronthaul Applications
Authors: Liu Xiang , Fan Qirui
Published: May 2023

We review recent advances in the mitigation of inter-channel four-wave-mixing (FWM) based on the “XYYX” input polarization alignment and unequal channel spacing to enable high- performance O-band WDM transmission for 800G-LR4, 1.6T-LR8 and bidirectional 5G fronthaul.
Complexity Versus Accuracy Tradeoffs in Nonlinear Fiber Propagation Models
Authors: Bosco Gabriella
Published: May 2023

Some of the most widespread analytical models for nonlinear propagation in fiber optic coherent systems are reviewed, highlighting the tradeoffs between accuracy and complexity in different transmission scenarios, including wide-band optical systems and short-reach links.
Robust Longitudinal Power Profile Estimation in Optical Networks using MMSE with Complex Scaling Factor
Authors: Kim Inwoong , Vassilieva Olga , Shinzaki Ryu , Eto Motohiko , Oda Shoichiro , Palacharla Paparao
Published: May 2023

We propose a power profile estimator using MMSE, that automatically adjusts the scaling and nonlinear rotation of constellation with complex scaling factor. We demonstrate robust performance in simulation and experiment, even at higher launch powers.
Optically Upconverted, Spatially Coherent Phased-Array-Antenna Feed Networks for Beam-Space MIMO in 5G Cellular Communications
Authors: Prather Dennis , Creavin Connor , Creazzo Timothy , Harrity Charles , Murakowski Janusz , Qi Xiao-Feng , Schneider Garrett , Schuetz Christopher , Shi Shouyuan , Shreve Kevin , Wang Fuquan , Yao Peng
Published: May 2023

We present an RF-photonic phased-array receiver that provides simultaneous multi-band and multi-beam operation in the millimeter-wave region of the spectrum. It uses a photonic integrated circuit to perform RF beamforming with near unlimited beam-bandwidth product.
Lateral scanning Raman scattering lidar for accurate measurement of atmospheric temperature and water vapor from ground to height of interest: publisher’s note
Authors: Yang Fan , Gao Fei , Zhang Chengan , Li Xiaoli , Gao Xiong , Hua Dengxin , Wang Li , Xin Wenhui , Stanič Samo
Published: May 2023

This publisher’s note contains corrections to Opt. Lett. 48, 2595 (2023).10.1364/OL.488924.
Structure learning for gene regulatory networks
Authors: Federico Anthony , Kern Joseph , Varelas Xaralabos , Monti Stefano
Published: May 2023

Inference of biological network structures is often performed on high-dimensional data, yet is hindered by the limited sample size of high throughput “omics” data typically available. To overcome this challenge, often referred to as the “small n, large p problem,” we exploit known organizing principles of biological networks that are sparse, modular, and likely share a large portion of their underlying architecture. We present SHINE—Structure Learning for Hierarchical Networks—a framework for defining data-driven structural constraints and incorporating a shared learning paradigm for efficiently learning multiple Markov networks from high-dimensional data at large p/n ratios not previously feasible. We evaluated SHINE on Pan-Cancer data comprising 23 tumor types, and found that learned tumor-specific networks exhibit expected graph properties of real biological networks, recapture previously validated interactions, and recapitulate findings in literature. Application of SHINE to the analysis of subtype-specific breast cancer networks identified key genes and biological processes for tumor maintenance and survival as well as potential therapeutic targets for modulating known breast cancer disease genes.
SARS-CoV-2 transmission with and without mask wearing or air cleaners in schools in Switzerland: A modeling study of epidemiological, environmental, and molecular data
Authors: Banholzer Nicolas , Zürcher Kathrin , Jent Philipp , Bittel Pascal , Furrer Lavinia , Egger Matthias , Hascher Tina , Fenner Lukas
Published: May 2023

Background

Growing evidence suggests an important contribution of airborne transmission to the overall spread of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), in particular via smaller particles called aerosols. However, the contribution of school children to SARS-CoV-2 transmission remains uncertain. The aim of this study was to assess transmission of airborne respiratory infections and the association with infection control measures in schools using a multiple-measurement approach.

Methods and findings

We collected epidemiological (cases of Coronavirus Disease 2019 (COVID-19)), environmental (CO2, aerosol and particle concentrations), and molecular data (bioaerosol and saliva samples) over 7 weeks from January to March 2022 (Omicron wave) in 2 secondary schools (n = 90, average 18 students/classroom) in Switzerland. We analyzed changes in environmental and molecular characteristics between different study conditions (no intervention, mask wearing, air cleaners). Analyses of environmental changes were adjusted for different ventilation, the number of students in class, school and weekday effects. We modeled disease transmission using a semi-mechanistic Bayesian hierarchical model, adjusting for absent students and community transmission.

Molecular analysis of saliva (21/262 positive) and airborne samples (10/130) detected SARS-CoV-2 throughout the study (weekly average viral concentration 0.6 copies/L) and occasionally other respiratory viruses. Overall daily average CO2 levels were 1,064 ± 232 ppm (± standard deviation). Daily average aerosol number concentrations without interventions were 177 ± 109 1/cm3 and decreased by 69% (95% CrI 42% to 86%) with mask mandates and 39% (95% CrI 4% to 69%) with air cleaners. Compared to no intervention, the transmission risk was lower with mask mandates (adjusted odds ratio 0.19, 95% CrI 0.09 to 0.38) and comparable with air cleaners (1.00, 95% CrI 0.15 to 6.51).

Study limitations include possible confounding by period as the number of susceptible students declined over time. Furthermore, airborne detection of pathogens document exposure but not necessarily transmission.

Conclusions

Molecular detection of airborne and human SARS-CoV-2 indicated sustained transmission in schools. Mask mandates were associated with greater reductions in aerosol concentrations than air cleaners and with lower transmission. Our multiple-measurement approach could be used to continuously monitor transmission risk of respiratory infections and the effectiveness of infection control measures in schools and other congregate settings.
Barriers and facilitators to anti-retroviral therapy adherence among adolescents aged 10 to 19 years living with HIV in sub-Saharan Africa: A mixed-methods systematic review and meta-analysis
Authors: Hlophe Londiwe D. , Tamuzi Jacques L. , Shumba Constance S. , Nyasulu Peter S.
Published: May 2023

Background

Human Immunodeficiency Virus (HIV) significantly affects adolescents globally, with the sub-Saharan Africa (SSA) reporting a high burden of the disease. HIV testing, treatment, and retention to care are low among adolescents. We conducted a mixed-method systematic review to assess anti-retroviral therapy (ART) adherence; barriers and facilitators to ART adherence and ART outcomes among adolescents living with HIV and on ART in sub-Saharan Africa.

Methods

We conducted searches in four scientific databases for studies conducted between 2010 and March 2022 to identify relevant primary studies. Studies were screened against inclusion criteria and assessed for quality, and data was extracted. Meta-analysis of rates and odd ratios was used to plot the quantitative studies and meta-synthesis summarized the evidence from qualitative studies.

Results

A total of 10 431 studies were identified and screened against the inclusion/ exclusion criteria. Sixty-six studies met the inclusion criteria (41 quantitative, 16 qualitative, and 9 mixed-methods study designs). Fifty-three thousand two hundred and seventeen (53 217) adolescents (52 319 in quantitative studies and 899 in qualitative studies) were included in the review. Thirteen support focused interventions for improved ART adherence were identified from quantitative studies. The plotted results from the meta-analysis found an ART adherence rate of 65% (95%CI 56–74), viral load suppression was 55% (95%CI 46–64), un-suppressed viral load rate of 41% (95%CI 32–50), and loss to follow up of 17% (95%CI 10–24) among adolescents. Meta-synthesis found six themes of barriers to ART (social, patient-based, economic, health system-based, therapy-based, and cultural barriers) in both the qualitative and quantitative studies, and three themes of facilitators to ART were also identified (social support, counselling, and ART education and secrecy or confidentiality) from qualitative studies.

Conclusion

ART adherence remains low among adolescents in SSA despite multiple interventions implemented to improve ART adherence. The low adherence rate may hinder the attainment of the UNAIDS 2030 targets. Additionally, various barriers to ART adherence due to lack of support have been reported among this age group. However, interventions aimed at improving social support, educating, and counselling adolescents may improve and sustain ART adherence.

Trial registration

Systematic review registration:PROSPEROCRD42021284891.