A5009987903- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- PAPR reduction in OFDM
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Neural Networks and Reservoir Computing
- graph theory and CDMA systems
- Coding theory and cryptography
Menlo School
2025
Mission College
2021
Intel (United States)
2020-2021
Infinera (United States)
2017
Université Laval
2013-2016
Sharif University of Technology
2011
We describe the performance of high bandwidth-density silicon photonic based integrated circuits (SiPh ICs) that enable first fully functional engine (PE) module co-packaged with an Ethernet switch. demonstrate 1.6 Tbps SiPh transmitter (Tx) IC integrates on-die all lasers, micro ring modulators, monitor photodetectors, spot size converters, and V-grooves are needed to support sixteen 106.25 Gbps PAM4 optical transmit channels. This Tx, together discrete receiver (Rx) ICs, enabled 800 PE....
Mode division multiplexing (MDM) systems using orbital angular momentum (OAM) modes can recover the data in D different without recourse to full (2D × 2D) multiple input output (MIMO) processing. One of biggest challenges OAM-MDM is mode instability following fiber propagation. Previously, MIMO-free transmission with two over 1.1 km vortex was demonstrated, where optical polarization demultiplexing employed setup. We demonstrate MDM OAM 1.4 a specially designed ring core MIMO processing or...
Fully integrated monolithic, multi-channel InP-based coherent receiver PICs and transceiver modules with extended C-band tunability are described. These operate at 33 44 Gbaud per channel under dual polarization (DP) 16-QAM modulation. Fourteen-channel monolithic InP show integration data rate scaling capability to DP modulation for combined 4.9 Tb/s total capacity. Six simultaneous operation of a commercial module is demonstrated variety formats including >1.2Tbit/s aggregate
We theoretically study the performance of single sideband discrete multitone (SSB-DMT) in C -band with intensity modulation and direct detection. Our analysis allows us to quantify impact different noise sources such as signal-to-signal beating interference, phase-to-amplitude noise, attenuation, receiver sensitivity on SSB-DMT. analytical tools also allow optimize signal-to-carrier power ratio maximize SSB-DMT throughput. provide equations calculate bit error rate allocated Finally, we...
We propose and experimentally demonstrate a carrier-reuse, single-feeder, wavelength-division-multiplexed, orthogonal frequency-division-multiple-access passive optical network (WDM-OFDMA-PON) with colorless direct-detection units coherent detection line terminals. examine two strategies by adjusting the frequency occupancy modulation format of uplink (UL) downlink (DL) signals. investigate impact DL signal-to-carrier ratio on performance both UL signals via simulations identify impairments...
We investigate performance of optimized M-ary quadrature amplitude modulation (M-QAM) constellations in short-reach single-polarization (SP) and dual-polarization (DP) discrete multitone (DMT) with direct detection. The are obtained by using an iterative gradient-search algorithm. For the nonsquare constellations, we find bit-to-symbol mappings a blind search method. Our experiments show that data rate can be improved both SP DP DMT systems instead square M-QAM. Net transmission rates 165...
We present a comprehensive study of nonlinear distortions from an optical OFDM transmitter. Nonlinearities are introduced by the combination effects digital-to-analog converter (DAC), electrical power amplifier (PA) and modulator in presence high peak-to-average ratio (PAPR). introduce parameters to quantify transmitter nonlinearity. High input backoff avoids signal compression PA, but incurs penalties efficiency. At low backoff, common PAPR reduction techniques not effective suppressing PA...
We demonstrate the mode division multiplexing system using two orbital angular momentum modes over 1.4 km RCF fiber. also use a new demultiplexing scheme enabling us to do electrical polarization demultiplexing.
We demonstrate wavelength conversion of 16-QAM signals over the entire C-band with low power penalty (<1.5 dB) at FEC threshold using a dual pump configuration. also investigate dependence on input OSNR.
We experimentally demonstrate the performance of a computationally efficient digital filter back-propagation scheme for post-compensating SOA nonlinearities in coherent detection 16-QAM signal at 16 Gbaud, and compare results with simulations.
We investigate the performance of digital filter back-propagation (DFBP) using coarse parameter estimation for mitigating SOA nonlinearity in coherent communication systems. introduce a simple, low overhead method DFBP based on error vector magnitude (EVM) as figure merit. The bit rate (BER) penalty achieved with this has negligible compared to fine estimation. examine different bias currents two commercial SOAs used booster amplifiers our experiments find optimum operating points and...
We simulate 100 Gb/s systems using PAM-4 (O-band without chromatic dispersion) and DMT (C-band with less attenuation). find the tolerance of each to laser linewidth, discuss fiber reach system.
We demonstrate a high-efficiency PAM4 silicon photonics transmitter optimized through end-to-end system modeling for applications up to 10km on four-channel CWDM4 grid. Our measurements show close agreement with simulations meeting 400G-FR4 requirements 1.7Vppd.
We investigate degradation of QPSK CO-OFDM system due to components most susceptible high PAPR. vary transmitter design parameters and uncover appropriate working conditions clipping effectiveness regions.
We find optimized M-QAM constellations for short-reach DDO-OFDM using an iterative gradient-search method and evaluate their performance. With the constellations, capacity is increased by 12 Gb/s compared to square constellation achieving data rate of 168 16-QAM.
100G/lane linear-drive pluggable optics demonstrate interoperability with over 3 dB link margin. Simulations suggest that 200G/lane linear drive requires bump-to-bump losses below 22 dB, but transmit-side retimers increase loss tolerance beyond 34 dB.
The performance of a three-dimensional optical code-division multiple-access system based on polarization-wavelength-time codes is investigated. unwanted effects multiple access interference are first studied and an accurate enough expression given for the upper bound bit error rate. proposed obtained by decomposing into horizontally vertically polarized two-dimensional wavelength-time that assumed to be statistically independent. It shown Monte Carlo simulation assumption independence gives...
A frequency-dependent nonlinear model has been proposed and experimentally verified at 100 Gb/s using PAM4. This universal simply requires adjusting two sets of polynomials based on the THD data is modulation format agnostic.
We investigate constellation-induced SNR gain in short-reach OFDM with direct detection for various distances and laser linewidths. Performance improvement by using alternate constellations is more significant lower quality lasers, especially 8-QAM. As transmission distance increases, higher obtained (1.92dB 100km).
We theoretically studied the effect of all degradations to C-band optical SSB-OFDM: signal-to-signal beating interference, phase-to-amplitude noise, and intercarrier attenuation. Each noise source has potential dominate degradation depending on signal-to-carrier power ratio number zero padded subcarriers. examine each in terms signal-to-noise ratio, which is calculated for subcarriers using simulation theory. Simulations confirm that theoretical expressions obtained match numerical results.