Leslie A. Rusch
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View article: Comb-Driven Coherent Optical Transmitter for Scalable DWDM Interconnects
Comb-Driven Coherent Optical Transmitter for Scalable DWDM Interconnects Open
Driven by the growing demand for large-scale artificial intelligence applications, disaggregated compute nodes and high-radix switches in next-generation computing clusters are set to surpass the capacity of current optical interconnect te…
View article: Robust Resource Allocation for Over-the-Air Computation Networks with Fluid Antenna Array
Robust Resource Allocation for Over-the-Air Computation Networks with Fluid Antenna Array Open
Fluid antenna (FA) array is envisioned as a promising technology for next-generation communication systems, owing to its ability to dynamically control the antenna locations. In this paper, we apply FA array to boost the performance of ove…
View article: High-repetition-rate electro-optic frequency combs using cascaded silicon phase modulators
High-repetition-rate electro-optic frequency combs using cascaded silicon phase modulators Open
We explore what we believe to be novel methods to improve the spacing and flatness of comb lines in an electro-optic frequency comb using cascaded silicon phase modulators. Our analysis extends to various factors influencing the comb spect…
View article: Modeling the second stage of extended L-band fiber amplifiers using neural networks trained on experimental data
Modeling the second stage of extended L-band fiber amplifiers using neural networks trained on experimental data Open
Neural networks are fast and accurate in modeling L-band erbium-doped fiber amplifiers with a single stage. To extend this approach to second-stage (or mid-stage) amplifiers, we must address nonuniform and high-power input signals, as well…
View article: Ultrafast Coherent Dynamics of Microring Modulators
Ultrafast Coherent Dynamics of Microring Modulators Open
Next-generation computing clusters require ultra-high-bandwidth optical interconnects to support large-scale artificial-intelligence applications. In this context, microring modulators (MRMs) emerge as a promising solution. Nevertheless, t…
View article: Impact of bending angle on antiresonant fibers with optimized symmetric geometries
Impact of bending angle on antiresonant fibers with optimized symmetric geometries Open
View article: 120 GOPS Photonic tensor core in thin-film lithium niobate for inference and in situ training
120 GOPS Photonic tensor core in thin-film lithium niobate for inference and in situ training Open
View article: RF crosstalk mitigation via floating shields in parallel silicon traveling-wave modulators
RF crosstalk mitigation via floating shields in parallel silicon traveling-wave modulators Open
High-density integration of electro-optic (E-O) elements in photonic integrated circuits (PICs) offers compact, low-cost high-capacity transceiver modules. Tighter component spacing increases compactness, but leads to crosstalk that can de…
View article: Pre-compensating digital-to-analog converter impairments with an LSTM neural network
Pre-compensating digital-to-analog converter impairments with an LSTM neural network Open
The performance of high-speed coherent communication heavily depends on digital-to-analog converters (DACs) when they operate within bandlimited and nonlinear regimes. We examine neural network (NN) based digital pre-distortion (DPD) metho…
View article: Roadmap on optical communications
Roadmap on optical communications Open
The Covid-19 pandemic showed forcefully the fundamental importance broadband data communication and the internet has in our society. Optical communications forms the undisputable backbone of this critical infrastructure, and it is supporte…
View article: Tailoring focal plane component intensities of polarization singular fields in a tight focusing system
Tailoring focal plane component intensities of polarization singular fields in a tight focusing system Open
The scientific community studies tight focusing of radially and azimuthally-polarized vector beams as it is a versatile solution for many applications. We offer a new method to produce tight focusing that ensures a more uniform intensity p…
View article: Modeling extended L-band fiber amplifiers using neural networks trained on experimental data
Modeling extended L-band fiber amplifiers using neural networks trained on experimental data Open
Producing high performance amplifiers requires accurate numerical models. As the optimization space is large, computationally efficient models are of great value. Parameter-based models for L-band amplifiers have accuracy limited by diffic…
View article: Auto-Encoder Optimized PAM IM/DD Transceivers for Amplified Fiber Links
Auto-Encoder Optimized PAM IM/DD Transceivers for Amplified Fiber Links Open
We examine pulse amplitude modulation (PAM) for intensity modulation and direct detection systems. Using a straight-forward, mixed noise model, we optimize the constellations with an autoencoder-based neural network (NN), an improve requir…
View article: Performance vs. complexity in NN pre-distortion for a nonlinear channel
Performance vs. complexity in NN pre-distortion for a nonlinear channel Open
Optical communications at high bandwidth and high spectral efficiency rely on the use of a digital-to-analog converter (DAC). We propose the use of a neural network (NN) for digital pre-distortion (DPD) to mitigate the quantization and ban…
View article: Initialized autoencoders to find constellations robust to residual laser phase noise
Initialized autoencoders to find constellations robust to residual laser phase noise Open
Autoencoder (AE) has been used to find quadrature amplitude modulation (QAM) constellations robust to optical impairments, such as residual laser phase noise or fiber nonlinearities. We examine AE for constellations for fiber links with re…
View article: Optimization criteria and design of few-mode Erbium-doped fibers for cladding-pumped amplifiers
Optimization criteria and design of few-mode Erbium-doped fibers for cladding-pumped amplifiers Open
We propose a novel optimization method that combines two design criteria to reduce the differential modal gain (DMG) in few-mode cladding-pumped erbium-doped fiber amplifiers (FM-EDFAs). In addition to the standard criterion that considers…
View article: Program at a Glance
Program at a Glance Open
Create Optimized Components with Photonic Inverse Design Join us for a hands-on workshop focused on photonic inverse design (PID) -a design process where, given desired target performance, computational methods are employed to automaticall…
View article: Silicon Photonics in Optical Access Networks for 5G Communications
Silicon Photonics in Optical Access Networks for 5G Communications Open
Only radio access networks can provide connectivity across multiple antenna\nsites to achieve the great leap forward in capacity targeted by 5G. Optical\nfronthaul remains a sticking point in that connectivity, and we make the case\nfor an…
View article: Recurrent neural networks achieving MLSE performance for optical channel equalization
Recurrent neural networks achieving MLSE performance for optical channel equalization Open
We explore recurrent and feedforward neural networks to mitigate severe inter-symbol interference (ISI) caused by bandlimited channels, such as high speed optical communications systems pushing the frequency response of transmitter compone…
View article: Radially anisotropic ring-core optical fiber: towards vector-vortex guided transmission using the full modal space
Radially anisotropic ring-core optical fiber: towards vector-vortex guided transmission using the full modal space Open
The radially anisotropic ring-core fiber with cylindrical birefringence is theoretically and numerically investigated as a novel platform for the transmission of vector-vortex beams with unique modal properties. First, we elucidate the par…
View article: IRS-Empowered Wireless Communications: State-of-the-Art, Key Techniques, and Open Issues
IRS-Empowered Wireless Communications: State-of-the-Art, Key Techniques, and Open Issues Open
In this article, we overview intelligent reflecting surface (IRS)-empowered wireless communication systems. We first present the fundamentals of IRS-assisted wireless transmission. On this basis, we explore the integration of IRS with vari…
View article: Overlaying 5G radio access networks on wavelength division multiplexed optical access networks with carrier distribution
Overlaying 5G radio access networks on wavelength division multiplexed optical access networks with carrier distribution Open
As 5G communication matures, the requirement for advanced radio access networks (RAN) drives the evolution of optical access networks to support these needs. Basic RAN functions, mobile front-haul to the backbone and interconnected front-e…
View article: Real-time gap-free dynamic waveform spectral analysis with nanosecond resolutions through analog signal processing
Real-time gap-free dynamic waveform spectral analysis with nanosecond resolutions through analog signal processing Open
View article: Silicon photonic subsystem for broadband and RoF detection while enabling carrier reuse
Silicon photonic subsystem for broadband and RoF detection while enabling carrier reuse Open
We experimentally validate a silicon photonic subsystem designed for passive optical networks with carrier reuse. The subsystem is intended for future wavelength division multiplexed (WDM) PONs. It enables radio-over-fiber signals to cohab…
View article: Optimal ultra-miniature polarimeters in silicon photonic integrated circuits
Optimal ultra-miniature polarimeters in silicon photonic integrated circuits Open
Measurement of the state of polarization of light is essential in a vast number of applications, such as quantum and classical communications, remote sensing, astronomy, and biomedical diagnostics. Nanophotonic structures and integrated ph…
View article: Reduced-size lookup tables enabling higher-order QAM with all-silicon IQ modulators
Reduced-size lookup tables enabling higher-order QAM with all-silicon IQ modulators Open
We experimentally demonstrate 20 Gbaud 256QAM and 40 Gbaud 128QAM in an all-silicon IQ modulator. We combine a linear equalizer and a nonlinear predistortion implemented in a lookup table (LUT). We achieve bit error rate (BER) below the 20…
View article: Silicon Photonic IQ Modulators for 400 Gb/s and Beyond
Silicon Photonic IQ Modulators for 400 Gb/s and Beyond Open
Silicon photonics has enormous potential for ultrahigh-capacity coherent optical transceivers. We demonstrate an IQ modulator using silicon photonic traveling-wave modulators optimized for higher-order quadrature amplitude modulation (QAM)…
View article: SiP-Based SSBI Cancellation for OFDM
SiP-Based SSBI Cancellation for OFDM Open
We propose for the first time to use a silicon photonics (SiP) solution for a passive optical network to both reduce signal-signal beat interference (SSBI) and recuperate a part of the downlink carrier for use in the uplink. The Kramers-Kr…
View article: Analysis of modal coupling due to birefringence and ellipticity in strongly guiding ring-core OAM fibers
Analysis of modal coupling due to birefringence and ellipticity in strongly guiding ring-core OAM fibers Open
After briefly recalling the issue of OAM mode purity in strongly-guiding ring-core fibers, this paper provides a methodology to calculate the coupling strength between OAM mode groups due to fiber perturbations. The cases of stress birefri…
View article: Design of Highly Elliptical Core Ten-Mode Fiber for Space Division Multiplexing With 2 × 2 MIMO
Design of Highly Elliptical Core Ten-Mode Fiber for Space Division Multiplexing With 2 × 2 MIMO Open
We propose a weakly-coupled few-mode fiber requiring only 2×2 MIMO equalizer blocks, which makes it compatible with standard coherent receivers with polarization diversity. The fiber has a highly-elliptical core, surrounded by a depressed …