Tingjun Chen

Journal article Science advances · January 2026 Modern edge devices, such as cameras, drones, and internet-of-things nodes, rely on machine learning to enable a wide range of intelligent applications. However, deploying machine learning models directly on the often resource-constrained edge devices dema ... Full text Cite

Scalable ML models and cascaded learning for efficient multi-span OSNR and GSNR prediction

Journal article Journal of Optical Communications and Networking · January 1, 2026 Scalable and efficient methods for predicting optical transmission performance using machine learning (ML) and cascaded learning (CL) are investigated in metro multi-span optical networks. We extend the CL framework beyond multi-span power spectrum predict ... Full text Cite

Agentic AI for Scalable and Robust Optical Systems Control

Journal article IEEE Access · January 1, 2026 We present AgentOptics, a language-driven orchestration layer for high-fidelity, autonomous optical system control built upon the Model Context Protocol (MCP). AgentOptics interprets natural language tasks and executes standardized, schema-validated action ... Full text Cite

Multi-span optical power spectrum prediction using cascaded learning with one-shot end-to-end measurement

Journal article Journal of Optical Communications and Networking · January 1, 2025 Scalable methods for optical transmission performance prediction using machine learning (ML) are studied in metro reconfigurable optical add-drop multiplexer (ROADM) networks. A cascaded learning framework is introduced to encompass the use of cascaded com ... Full text Cite

Design and Testbed Deployment of Frequency-Domain Equalization Full Duplex Radios

Journal article IEEE Transactions on Wireless Communications · January 1, 2025 Full-duplex (FD) wireless can significantly enhance spectrum efficiency but requires effective self-interference (SI) cancellers. RF SI cancellation (SIC) via frequency-domain equalization (FDE), where bandpass filters channelize the SI, is suited for inte ... Full text Cite

On the Optimization and Stability of Sectorized Wireless Networks

Journal article IEEE Transactions on Networking · January 1, 2025 Future wireless networks need to support the increasing demands for high data rates and improved coverage. One promising solution is sectorization, where an infrastructure node is equipped with multiple sectors employing directional communication. Although ... Full text Cite

Generalized few-shot transfer learning architecture for modeling the EDFA gain spectrum

Journal article Journal of Optical Communications and Networking · January 1, 2025 Accurate modeling of the gain spectrum in erbium-doped fiber amplifiers (EDFAs) is essential for optimizing optical network performance, particularly as networks evolve toward multi-vendor solutions. In this work, we propose a generalized few-shot transfer ... Full text Cite

Optical Link Tomography: First Field Trial and 4D Extension

Journal article Journal of Lightwave Technology · January 1, 2025 Optical link tomography (OLT) is a rapidly evolving field that allows the multi-span, end-to-end visualization of optical power along fiber links in multiple dimensions from network endpoints, solely by processing signals received at coherent receivers. Th ... Full text Cite

Full-Duplex Receiver With Wideband, High-Power RF Self-Interference Cancellation Based on Capacitor Stacking in Switched-Capacitor Delay Lines

Journal article IEEE Journal of Solid State Circuits · July 1, 2024 The self-interference (SI) channels in full-duplex (FD) radios have large nano-second-scale delay spreads, which poses a significant challenge in designing SI cancelers that can emulate the SI channel over wide bandwidths. Passive implementations of high d ... Full text Cite

Field Trial of Coexistence and Simultaneous Switching of Real-Time Fiber Sensing and Coherent 400 GbE in a Dense Urban Environment

Journal article Journal of Lightwave Technology · February 15, 2024 Recent advances in optical fiber sensing have enabled telecom network operators to monitor their fiber infrastructure while generating new revenue in various application scenarios including data center interconnect, public safety, smart cities, and seismic ... Full text Cite

Fast WDM provisioning with minimal probing: the first field experiments for DC exchanges

Journal article Journal of Optical Communications and Networking · February 1, 2024 There are increasing requirements for data center interconnection (DCI) services, which use fiber to connect any DC distributed in a metro area and quickly establish high-capacity optical paths between cloud services and mobile edge computing and the users ... Full text Cite

Doubling Down on Wireless Capacity: A Review of Integrated Circuits, Systems, and Networks for Full Duplex

Journal article Proceedings of the IEEE · January 1, 2024 The relentless demand for data in our society has driven the continuous evolution of wireless technologies to enhance network capacity. While current deployments of 5G have made strides in this direction using massive multiple-input–multiple-output (MIMO) ... Full text Cite

Semi-automatic line-system provisioning with an integrated physical-parameter-aware methodology: field verification and operational feasibility

Journal article Journal of Optical Communications and Networking · January 1, 2024 We propose methods and an architecture to conduct measurements and optimize newly installed optical fiber line systems semi-automatically using integrated physics-aware technologies in a data center interconnection (DCI) transmission scenario. We demonstra ... Full text Cite

Open-access millimeter-wave software-defined radios in the PAWR COSMOS testbed: Design, deployment, and experimentation

Journal article Computer Networks · October 1, 2023 While millimeter-wave (mmWave) wireless has recently gained tremendous attention with the transition to 5G, developing a broadly accessible experimental infrastructure will largely facilitate the research and allow the community to make significant progres ... Full text Cite

Open EDFA gain spectrum dataset and its applications in data-driven EDFA gain modeling

Journal article Journal of Optical Communications and Networking · September 1, 2023 Optical networks satisfy high bandwidth and low latency requirements for telecommunication networks and data center interconnection. To improve network resource utilization, machine learning (ML) is used to accurately model optical amplifiers such as erbiu ... Full text Cite

Wideband Full-Duplex Phased Array with Joint Transmit and Receive Beamforming: Optimization and Rate Gains

Journal article IEEE ACM Transactions on Networking · August 1, 2021 Full-duplex (FD) wireless and phased arrays are both promising techniques that can significantly improve data rates in future wireless networks. However, integrating FD with transmit (Tx) and receive (Rx) phased arrays is extremely challenging, due to the ... Full text Cite

Directional Measurements in Urban Street Canyons from Macro Rooftop Sites at 28 GHz for 90% Outdoor Coverage

Journal article IEEE Transactions on Antennas and Propagation · June 1, 2021 Path gain and effective directional gain in azimuth in urban canyons from actual rooftop base station sites are characterized based on a massive data set of 3000 links on 12 streets in two cities, with over 21 million individual continuous-wave power measu ... Full text Cite

A Full-Duplex Receiver with True-Time-Delay Cancelers Based on Switched-Capacitor-Networks Operating beyond the Delay-Bandwidth Limit

Journal article IEEE Journal of Solid State Circuits · May 1, 2021 Wideband self-interference cancellation (SIC) in full-duplex (FD) radios requires the achievement of large delays to accurately emulate the SI channel. However, compact, power-efficient, low-loss/noise/distortion nanosecond-scale delays are extremely chall ... Full text Cite

A Survey and Quantitative Evaluation of Integrated Circuit-Based Antenna Interfaces and Self-Interference Cancellers for Full-Duplex

Journal article IEEE Open Journal of the Communications Society · January 1, 2021 Full-duplex (FD) wireless - simultaneous transmission and reception on the same frequency - is a promising technique that can significantly improve spectrum efficiency and reduce communication latency in future wireless networks. To enable FD operation, th ... Full text Cite

Multi-Watt, 1-GHz CMOS Circulator Based on Switched-Capacitor Clock Boosting

Journal article IEEE Journal of Solid State Circuits · December 1, 2020 There has been significant recent progress in the implementation of integrated non-reciprocal components based on linear periodically time-varying (LPTV) circuits. Nevertheless, integrated circulators still require a leap forward in power handling, clock p ... Full text Cite

Hybrid Scheduling in Heterogeneous Half- And Full-Duplex Wireless Networks

Journal article IEEE ACM Transactions on Networking · April 1, 2020 Full-duplex (FD) wireless is an attractive communication paradigm with high potential for improving network capacity and reducing delay in wireless networks. Despite significant progress on the physical layer development, the challenges associated with dev ... Full text Cite

Wideband Full-Duplex Wireless via Frequency-Domain Equalization: Design and Experimentation

Journal article · December 3, 2018 Full-duplex (FD) wireless can significantly enhance spectrum efficiency but requires tremendous amount of self-interference (SI) cancellation. Recent advances in the RFIC community enabled wideband RF SI cancellation (SIC) in integrated circuits (ICs) via ... Link to item Cite

Maximizing Broadcast Throughput under Ultra-Low-Power Constraints

Journal article IEEE ACM Transactions on Networking · April 1, 2018 Wireless object-tracking applications are gaining popularity and will soon utilize emerging ultra-low-power device-to-device communication. However, severe energy constraints require much more careful accounting of energy usage than what prior art provides ... Full text Cite

Open-Access Full-Duplex Wireless in the ORBIT Testbed

Journal article · January 9, 2018 In order to support experimentation with full-duplex (FD) wireless, we recently integrated an open-access FD transceiver in the ORBIT testbed. In this report, we present the design and implementation of the FD transceiver and interfaces, and provide exampl ... Link to item Cite

Integrated full duplex radios

Journal article IEEE Communications Magazine · January 1, 2017 Full duplex wireless has drawn significant interest in the recent past due to the potential for doubling network capacity in the physical layer and offering numerous other benefits at higher layers. However, the implementation of integrated full duplex rad ... Full text Cite

Panda: Neighbor Discovery on a Power Harvesting Budget

Journal article IEEE Journal on Selected Areas in Communications · December 1, 2016 Object tracking applications are gaining popularity and will soon utilize energy harvesting (EH) low-power nodes that will consume power mostly for neighbor discovery (ND) (i.e., identifying nodes within communication range). Although ND protocols were dev ... Full text Cite

Outage Minimization for a Fading Wireless Link with Energy Harvesting Transmitter and Receiver

Journal article IEEE Journal on Selected Areas in Communications · March 1, 2015 This paper studies online power control policies for outage minimization in a fading wireless link with energy harvesting transmitter and receiver. The outage occurs when either the transmitter or the receiver does not have enough energy, or the channel is ... Full text Cite