A5019070711- Photonic and Optical Devices
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Organic Electronics and Photovoltaics
- Quantum Dots Synthesis And Properties
- Photorefractive and Nonlinear Optics
- Photonic Crystals and Applications
- Conducting polymers and applications
- Magneto-Optical Properties and Applications
- Copper-based nanomaterials and applications
- Silicon and Solar Cell Technologies
- Advanced Surface Polishing Techniques
- Perovskite Materials and Applications
- Acoustic Wave Resonator Technologies
- Advanced Fiber Optic Sensors
- Neural Networks and Reservoir Computing
- Chalcogenide Semiconductor Thin Films
Georgia Institute of Technology
2018-2021
Carnegie Mellon University
2017-2018
University of Pittsburgh
2015
An electro-optic modulator (EOM) based on a racetrack resonator coupled to waveguide using butterfly multi-mode interference (MMI) coupler is fabricated Y-cut lithium niobate (LN) thin film. This the first demonstration of LN EOM in which film etched substrate chlorine-based inductively plasma reactive ion etching, process, readily compatible with semiconductor fabrication facility. The LNOI platform interesting for integration and acousto-optic components, since differently from any other...
We experimentally demonstrate the influence of DC Kerr effect in silicon photonic Mach-Zehnder modulators (MZMs) and ability to optimize combined effects plasma-dispersion achieve linear transfer characteristics thus suitability for microwave links digital modulation formats such as multilevel pulse amplitude modulation. PN PiN doped were fabricated through AIM Photonics. Intermodulation distortion products are demonstrated have reverse bias MZM dependencies advantageous highly operation....
We experimentally demonstrate two silicon photonic based mixer subsystems for applications in next gen fronthaul networks, defense, and communications space, avionics, vehicles. The leverage emerging integrated microwave photonics technology through the AIM Photonics foundry. Our work demonstrates potential full integration of spectrally agile functions to enable seamless upconversion downconversion over wide instantaneous bandwidths. Characterization frequency converting architectures...
An asymmetric Mach-Zehnder electro-optic modulator is fabricated through etching in 500nm thin film of Y-cut Lithium Niobate. A half wave voltage length product 16.8Vcm and modulation efficiency 9.4×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> V xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> were measured for this device which very close to what we expect from theory.
Abstract A 2‐step method involving the evaporation of solvent through surface encapsulation and induced alignment (ESSENCIAL) has been used to create a compositionally graded active layer interspersed acceptor donor domains by printing‐based technologies, which can be fabricate solar cells with higher performance than that from traditional bulk heterojunction fabrication methods. Herein, clarify fundamental mechanism improvement, multi‐scale simulation conducted compare resulting these two...
We demonstrate InP’s photonic integration promise for high performance microwave applications through the realization and characterization of a monolithically integrated downconverter achieving 104 dB∙Hz 2/3 SFDR near unity gain -0.8 dB.
Among various deposition techniques to deposit Cu2ZnSn(S,Se)4 (CZTSSe) thin films, solution-based processes have attracted considerable attention because of their potentially low cost. Most the reported methods are based on nonaqueous solvents, such as hydrazine, and organic solvents. We report CZTSSe films fabrication solar cells by a water-based, solution-processed method followed Se vapor annealing. The effects feeding time properties performance investigated. ratio Se/(Se+S) can be tuned...
We experimentally demonstrate improved microwave photonic link performance by optimizing integrated modulator biases and show that plasma-dispersion modulators may achieve intrinsic linearity on par with lithium niobate SFDRs greater than 100 dB-Hz2/3.
Photonic frequency converters are optical systems used to translate data at RF or microwave frequencies new carrier for processing retransmission. The conventional architecture includes conversion using Mach-Zehnder modulators, inherently nonlinear devices. mixing process occurs in photodiodes acting as electrical square law detectors. Therefore, the converter performance metrics governed by complex functions that vary widely with power levels, bias points and specific configurations require...
We present integrated transmitter architectures that overcome typical power limitations of silicon photonic modulators by relying on a nitride bypass. Simulations demonstrate improvements in SFDR ~10dB, NF ~15 dB and Gain ~25dB.
We demonstrate a CMOS-compatible extended cladding modulated integrated Bragg Grating filter, while meeting strict DRC requirements of SiPh foundries. A narrow bandwidth 2.1nm on the phase-shifted portion and 29.2dBm extinction ratio is measured. © 2019 The Author(s)
A novel co-integrated electronic-photonic distributed photo-mixer-amplifier is presented that improves the bandwidth and gain of system. An RF signal with an output power 10 dBm across 50 GHz was achieved.
We demonstrate a CMOS-compatible extended cladding modulated integrated Bragg Grating filter, while meeting strict DRC requirements of SiPh foundries. A narrow bandwidth 2.1nm on the phase-shifted portion and 29.2dBm extinction ratio is measured.
We derive and validate analytic expressions quantifying the link performance of photonic frequency converter systems identify major trends that enable comparison optimization discrete integrated implementations.
We present general expressions for RF gain, spurious free dynamic range and noise figure analog links with arbitrary transmittances. apply these to comprised of simulated fabricated integrated modulators.
We experimentally demonstrate the universal presence of DC Kerr effect in silicon modulators and report performance trends theoretical limits for optimization with implications both digital analog applications.
A compact radio frequency (RF) photonic receiver consisting of several integrated circuits (PIC) that performs channelization and simultaneously downconverts the signal is described. technique also presented to adjust phase shifters arrayed waveguide grating channelizer without direct measurements.
We demonstrate for the first time a self-homodyne transmitter architecture, compactly realized as monolithic InP system-on-chip analog photonic integrated circuit, with RF gain improvement >10 dB by using an actively-tuned optical bypass.
We report the performance of a synthetic Pockels modulator based on dominant DC Kerr effect commercial silicon platform, present expressions for quantifying fundamental performance, and compare to state-of-the-art modulators.