Zhenping Xing
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View article: Fast-Convergence Burst-Mode Digital Signal Processing for Coherent Passive Optical Networks
Fast-Convergence Burst-Mode Digital Signal Processing for Coherent Passive Optical Networks Open
Optical access networks have been evolving to meet the explosive growth of data traffic. It is foreseeable that the 100Gb/s/λ and beyond passive optical network (PON) will be required in future optical access networks. Coherent optical com…
View article: High-Extinction-Ratio and Compact 1310/1550 nm Wavelength Diplexer on SOI Platform Based on an SWG-Structured Two-Mode Interference Coupler
High-Extinction-Ratio and Compact 1310/1550 nm Wavelength Diplexer on SOI Platform Based on an SWG-Structured Two-Mode Interference Coupler Open
We propose a 1310/1550 nm wavelength diplexer on a 220-nm silicon-on-insulator (SOI) platform. The device is based on a compact two-mode interference (TMI) coupler enabled by a subwavelength grating (SWG) slot. The ideal beat length ratio …
View article: Asymmetric Self-Coherent Detection Based on Mach-Zehnder Interferometers
Asymmetric Self-Coherent Detection Based on Mach-Zehnder Interferometers Open
We propose an asymmetric self-coherent detection scheme (ASCD) based on Mach-Zehnder interferometers (MZI) for the field reconstruction of self-coherent (SC) complex double-sideband (DSB) signals. The MZI-ASCD scheme approaches the high el…
View article: Asymmetric self-coherent detection
Asymmetric self-coherent detection Open
The bandwidth upgrade required in short-reach optical communications has prompted the need for detection schemes that combine field reconstruction with a cost-effective subsystem architecture. Here we propose an asymmetric self-coherent de…
View article: Net 220 Gbps/λ IM/DD Transmssion in O-Band and C-Band With Silicon Photonic Traveling-Wave MZM
Net 220 Gbps/λ IM/DD Transmssion in O-Band and C-Band With Silicon Photonic Traveling-Wave MZM Open
We present the design and characterization of O-band and C-band silicon photonic (SiP) traveling wave Mach-Zehnder modulators (TW-MZM) allowing 220 Gbps/λ net rate operation. The designed modulators show over 45 GHz 3-dB E-O bandwidth with…
View article: Systematic Performance Comparison of (Duobinary)-PAM-2,4 Signaling under Light and Strong Opto-Electronic Bandwidth Conditions
Systematic Performance Comparison of (Duobinary)-PAM-2,4 Signaling under Light and Strong Opto-Electronic Bandwidth Conditions Open
We present a systematic comparison of PAM-2 (NRZ), Duobinary-PAM-2, PAM-4, and Duobinary-PAM-4 (duo-quaternary) signaling in the context of short-reach photonic communications systems using a Mach–Zehnder modulator as transmitter. The effe…
View article: Demonstration of 108 Gb/s Duo-Binary PAM-8 Transmission and the Probabilistic Modeling of DB-PAM-M BER
Demonstration of 108 Gb/s Duo-Binary PAM-8 Transmission and the Probabilistic Modeling of DB-PAM-M BER Open
We report 108 Gb/s Duo-Binary PAM-8 (DB-PAM-8) transmission using direct-detection aided by Volterra equalizer. The bit-error-rate (BER) performance of the DB-PAM-8 signal has been evaluated through error counting by varying the bit rate, …
View article: 23-dB average isolation using a silicon photonic Mach-Zehnder modulator
23-dB average isolation using a silicon photonic Mach-Zehnder modulator Open
We demonstrate an optical time-gate isolator entirely fabricated on the silicon-on-insulator (SOI) platform based on a conventional traveling-wave Mach-Zehnder modulator (TW-MZM) design. The device achieves 18.2 dB (22.7 dB) time-averaged …
View article: Asymmetric direct detection of orthogonal offset carriers assisted polarization multiplexed single-sideband signals
Asymmetric direct detection of orthogonal offset carriers assisted polarization multiplexed single-sideband signals Open
We propose and demonstrate the asymmetric direct detection (ADD) of polarization division multiplexed single-sideband (PDM-SSB) signals with orthogonal offset carriers. ADD exploits the photocurrent difference to eliminate the Y-Pol interf…
View article: Integrated polarisation handling devices
Integrated polarisation handling devices Open
Photonic integrated circuits (PICs) suffer from birefringence due to high‐index contrast. Polarisation handling devices improve the performance of the PICs by reducing the polarisation‐dependent dispersion and loss. Furthermore, there is a…
View article: Optimization of thermo-optic phase-shifter design and mitigation of thermal crosstalk on the SOI platform
Optimization of thermo-optic phase-shifter design and mitigation of thermal crosstalk on the SOI platform Open
We first optimize the design and compare the performance of thermo-optic phase-shifters based on TiN metal and N++ doped silicon, in the same SOI process. The designs don't require special material processing, show negligible loss, and hav…
View article: Dual Parallel Multielectrode Traveling Wave Mach–Zehnder Modulator for 200 Gb/s Intra-datacenter Optical Interconnects
Dual Parallel Multielectrode Traveling Wave Mach–Zehnder Modulator for 200 Gb/s Intra-datacenter Optical Interconnects Open
We present a silicon photonic dual parallel multielectrode Mach–Zehnder modulator (MEMZM) based transmitter targeting 200 Gb/s four-level pulse amplitude modulation (PAM4) short reach transceivers. The MEMZMs have an average and electro-o…
View article: Experimental study of performance enhanced IM/DD transmissions combining 4D Trellis coded modulation with precoding
Experimental study of performance enhanced IM/DD transmissions combining 4D Trellis coded modulation with precoding Open
We propose to combine 4D trellis-coded modulation (TCM) with transmitter-side Tomlinson-Harashima precoding (THP) in IM/DD transmissions, and experimentally investigate the achieved performance improvement. Theoretically, THP can approxima…
View article: Demonstration of a 120° hybrid based simplified coherent receiver on SOI for high speed PON applications
Demonstration of a 120° hybrid based simplified coherent receiver on SOI for high speed PON applications Open
We demonstrate the first simplified coherent receiver using a 120° hybrid on silicon-on-insulator (SOI) for high speed PON applications. This coherent receiver integrates an inverse taper edge coupler for the received signal, a vertical gr…
View article: Compact high-performance adiabatic 3-dB coupler enabled by subwavelength grating slot in the silicon-on-insulator platform
Compact high-performance adiabatic 3-dB coupler enabled by subwavelength grating slot in the silicon-on-insulator platform Open
We demonstrate a compact high-performance adiabatic 3-dB coupler for the silicon-on-insulator platform. The refractive index of the gap region between two coupling waveguides is effectively increased using subwavelength grating, which lead…
View article: Design and analysis of high-speed optical access networks in the O-band with DSP-free ONUs and low-bandwidth optics
Design and analysis of high-speed optical access networks in the O-band with DSP-free ONUs and low-bandwidth optics Open
In this paper, we demonstrate and investigate high-speed passive optical networks (PON) in the O-band without using any digital signal processing (DSP) at the ONU side, meanwhile still adopting cost-effective low-bandwidth optics. We show …
View article: 100 Gb/s PAM4 transmission system for datacenter interconnects using a SiP ME-MZM based DAC-less transmitter and a VSB self-coherent receiver
100 Gb/s PAM4 transmission system for datacenter interconnects using a SiP ME-MZM based DAC-less transmitter and a VSB self-coherent receiver Open
We experimentally demonstrate a digital-to-analog-converter-less (DAC-less) vestigial sideband (VSB) 4-level pulse amplitude modulation (PAM4) transmission system for data center interconnects (DCIs) using a silicon photonic (SiP) multi-el…
View article: Silicon photonic dual-drive MIM based 56 Gb/s DAC-less and DSP-free PAM-4 transmission
Silicon photonic dual-drive MIM based 56 Gb/s DAC-less and DSP-free PAM-4 transmission Open
We report two designs of silicon photonic dual-drive Michelson interferometric modulators (MIMs) suitable for four-level pulse amplitude modulation (PAM-4) that do not require digital-to-analog converters or digital signal processing. The …
View article: Single wavelength 480 Gb/s direct detection over 80km SSMF enabled by Stokes vector Kramers Kronig transceiver
Single wavelength 480 Gb/s direct detection over 80km SSMF enabled by Stokes vector Kramers Kronig transceiver Open
We propose 4D modulation with directed detection employing a novel Stokes-Vector Kramers-Kronig transceiver. It shows that employing Stokes vector receiver, transmitted digital carrier and Kramers-Kronig detection offers an effective way t…
View article: Compact single-etched sub-wavelength grating couplers for O-band application
Compact single-etched sub-wavelength grating couplers for O-band application Open
We demonstrate two single-etched sub-wavelength grating coupler (SWGC) designs for O-band application, one targeting at high coupling efficiency and the other targeting at broad operating bandwidth. The high-efficiency SWGC has a measured …
View article: Analysis and Experimental Study of a Silicon Photonic Single MRM-Assisted MZI PAM-4 Modulator
Analysis and Experimental Study of a Silicon Photonic Single MRM-Assisted MZI PAM-4 Modulator Open
We report on the analysis and experimental study of a silicon photonic single microring modulator (MRM) assisted Mach–Zehnder interferometer for high-speed four-level pulse amplitude modulation (PAM-4). The static extinction ratio (ER) of …
View article: High-speed low-chirp PAM-4 transmission based on push-pull silicon photonic microring modulators
High-speed low-chirp PAM-4 transmission based on push-pull silicon photonic microring modulators Open
We report a silicon photonic modulator based on the use of dual parallel microring modulators (MRMs) inserted in a Mach-Zehnder interferometer (MZI). It is operated in a push-pull configuration for low-chirp transmission at approximately 1…
View article: An 80 Gb/s Silicon Photonic Modulator Based on the Principle of Overlapped Resonances
An 80 Gb/s Silicon Photonic Modulator Based on the Principle of Overlapped Resonances Open
We report a silicon photonic modulator based on a Mach–Zehnder interferometer (MZI) loaded with a microring modulator (MRM) on one arm and a microring resonator (MRR) on the other arm. The device is operated with the resonances of the MRM …
View article: A CMOS Compatible Ultracompact Silicon Photonic Optical Add-Drop Multiplexer with Misaligned Sidewall Bragg Gratings
A CMOS Compatible Ultracompact Silicon Photonic Optical Add-Drop Multiplexer with Misaligned Sidewall Bragg Gratings Open
We experimentally and via simulations demonstrate ultracompact single-stage and cascaded optical add-drop multiplexers using misaligned sidewall Bragg grating in a Mach-Zehnder interferometer for the silicon-on-insulator platform. The sing…