A5003445888- Photonic and Optical Devices
- Psychosocial Factors Impacting Youth
- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Advanced Photonic Communication Systems
- Child Therapy and Development
- Diverse Approaches in Healthcare and Education Studies
- Energy and Environmental Systems
- Educational Systems and Policies
- Advanced Fiber Optic Sensors
- Semiconductor Lasers and Optical Devices
- Education and Learning Interventions
- Healthcare Education and Workforce Issues
- Optical Coherence Tomography Applications
- Family and Disability Support Research
- Orbital Angular Momentum in Optics
- Neural Networks and Reservoir Computing
- Counseling Practices and Supervision
- Photonic Crystal and Fiber Optics
- Semiconductor Quantum Structures and Devices
- Korean Urban and Social Studies
- Advanced Fluorescence Microscopy Techniques
- Optical Polarization and Ellipsometry
- Diverse Topics in Contemporary Research
- Photorefractive and Nonlinear Optics
Providence College
2024
Nokia (United States)
2015-2024
Sookmyung Women's University
2006
Seoul National University
1989
Exploiting a particular wave property for application necessitates components capable of discriminating in the basis that property. While spectral or polarisation decomposition can be straightforward, spatial is inherently more difficult and few options exist regardless type. Fourier by lens rare simple example great practical importance simplicity; two-dimensional beam into its linear momentum components. Yet this often not most appropriate basis. Previously, no device existed orbital...
We demonstrate mode-multiplexed 90×90 MIMO transmission over all nine mode groups of a 26.5-km graded-index multimode fiber span, achieving record spectral efficiency 202 bit/s/Hz.
Recently, there is increasing interest in utilizing Stokes vector receiver, which a direct-detection technique with the capability to digitally track polarization changes fibers and decode information multiple dimensions. Here, we report monolithically integrated silicon photonic consists of one beam splitter, two rotators, 90-degree optical hybrid, six germanium photodetectors. Paired in-phase/quadrature modulator incorporating power-tunable carrier orthogonal polarization, transmission at...
Stable lasers play a significant role in precision optical systems where an electro-optic laser frequency stabilization system, such as the Pound-Drever-Hall technique, measures and actively stabilizes it by comparing to reference. Despite their excellent performance, there has been trade-off between complexity, scalability, noise measurement sensitivity. Here, we propose experimentally demonstrate modulation-free method using integrated cavity-coupled Mach-Zehnder interferometer...
We report four-channel discrete multi-tone modulation using silicon photonic circuits with net channel rates of 100 Gb/s and 70 detected by commercial germanium receivers, respectively. Transmission up to 4-km fiber is presented.
Thin-film lithium niobate (TFLN) based frequency doublers have widely been recognized as an essential component for both classical and quantum optical communications. Nonetheless, the efficiency (unit: %/W) of these devices is hindered by imperfections present in quasi-phase matching (QPM) spectrum. In this report, we a thorough experimental study spectral TFLN with varying lengths, ranging from 5 to 15 mm. A non-destructive diagnostic method on scattered light imaging proposed employed...
Multi-plane light conversion is a method of performing spatial basis transformations using cascaded phase plates separated by Fourier transforms or free-space propagation. In general, the number required scales with dimensionality (total modes) in transformation. This practical limitation technique as it relates to scaling large mode counts. Firstly, requiring many planes increases complexity optical system itself making difficult implement, but also because even very small loss per plane...
A microring modulator array coupled to a common bus waveguide can be used construct low power, compact and flexible wavelength-division-multiplexing (WDM) transmitters. However, due extremely small working bandwidths of the rings, it is challenging find right resonant wavelength setting locking resonance an external laser. In paper, we propose novel technique enabling simultaneous with single monitor, together automatically optimizing setting. We experimentally demonstrate three rings over...
We integrate a bow-tie antenna on thin-film lithium niobate (TFLN) phase modulator to form an electromagnetic E-field sensor. The fiber-coupled TFLN chip is probed by two-tone optical local oscillator generated using external modulator, which after appropriate filtering allows the system act as photonic down-converter. compatible with use of balanced detection, enabling improved signal-to-noise ratio. demonstrate down-conversion 28.3 GHz free-space microwave signal 100 MHz sensitivity 2...
We demonstrate digital turbulence compensation using a 12-spatial mode coherent receiver with multimode preamplifier that provides 6-dB sensitivity improvement. This combination acts similarly to ideal lossless adaptive optics. Coherent superposition of 12 spatial-modes reduced median BER from 0.1 1×10-5 compared traditional single-mode detection.
We demonstrate up to 100 Gbaud quadrature-amplitude modulated (QAM) signal generation with monolithic silicon in-phase quadrature (I/Q)-modulator based on silicon-germanium (SiGe) electro-absorption modulators (EAM). The modulator is in a differentially driven Mach-Zehnder (MZ) interferometric configuration similar the conventional MZ (MZM) (I/Q) modulators. In particular, single-polarization phase-shift keying (SP-QPSK) signaling at symbol rates of BERs below hard-decision forward error...
Powerful warehouse-scale datacenters form the fabric of cloud computing. Efficient computing requires intra-datacenter interconnects with large capacity, low energy consumption, and high scalability. These unique goals present brand new scientific technological challenges for short-reach optical communications. Silicon photonics (SiP) modulators are promising its superiority cost, small footprint, complementary metal-oxide-semiconductor (CMOS) compatibility. While currently, main research...
We propose a novel approach to demonstrate simultaneous multi-wavelength locking during temperature changes in silicon photonic polarization insensitive microring-based wavelength division multiplexing (WDM) receiver. The DC component of single monitoring photodetector at the through port microring filter array is exploited as feedback signal with no additional power consumption. This used control circuitry properly tune filters using ohmic heating, thus creating loop for thermal adaptation....
We report ten-channel discrete multi-tone generation using silicon microring modulator array, which simultaneously function as de-multiplexers, modulators, and multiplexers. An aggregated data rate of 0.88 Tb/s is achieved at a bit error ratio 3.8×10−3.
Multiple access interfaces are required to provide the wireless coverage and capacity that operators need for consistent service across their geographic footprint. As a consequence, future radio networks will be hybrid 4G/LTE-5G networks. This technology evolution is creating many challenges in mobile fronthaul (MFH) support co-existence of common public (CPRI) evolved (eCPRI) traffic with diverse connectivity requirements term reach. To address these challenges, this paper introduces 100...
Dense integration of electro-optic (EO) devices in photonic integrated circuits (PICs) is critical to achieve high-capacity, compact and low-cost transceiver modules, fulfill the increasing bandwidth and/or density demands for future computers, servers, data centers, transport optical network systems. However, EO crosstalk due high may degrade signal transmission performance eventually limit possible integration. In this content, study a PIC its impact crucial. paper, we systematically...
Optical devices that introduce and compensate for dispersion serve an important role in communication networks, photonic signal processing, nonlinear optics. In this article, we demonstrate a silicon Bragg grating which simultaneously achieves large wide bandwidth. We measure the to have of −146 ps/nm over 171 GHz bandwidth, representing highest demonstrated bandwidth standard thickness photonics process. Additionally, show significant reduction group delay ripple by tuning using integrated...
Silicon microrings can find a wide range of applications in optical interconnects and communications. However, their resonant wavelengths are extremely sensitive to fabrication temperature variations. Here we review possible solutions address this challenge.
We demonstrate a hybrid silicon tunable laser with wide tunability and rapid switching speed for applications in sensing optical networks. By implementing an optimized carrier injection phase shifter design, the filters of cavity may be efficiently controlled, enabling both fine broad wavelength tuning across 56 nm range, addition to 10 ns time. The emits up dBm output power, linewidth is near 200 kHz. fast demonstrated here employed data center access networks, while potential sweeping...
We demonstrate rapid wavelength measurements with response times under 200 ns using a silicon photonic wavemeter. With this new capability, we show tracking of DFB laser's during fast ramps and short bursts, for possible use in LiDAR, sensing, imaging, or optical communication applications.
We demonstrate a multi-plane light conversion device based on 7 planes which maps Hermite-Gaussian spatial modes with indices (m, n) onto Cartesian grid (x, y) of diffraction limited spots for 210 modes.
We demonstrate a wavelength-tunable hybrid III-V/Si transmitter based on Vernier laser with more than 30 nm tuning range and two microring modulators nested in Mach-Zehnder interferometer. This circuit has versatile operating modes. It can be used for on-off keying (OOK) generation low drive voltage push-pull ring quadrature phase-shift (QPSK) where binary signal is generated by each ring. reported the first integrated high-speed (BW ~23 GHz), which cover nm. OOK better integrity, lower...
Electro-magnetic (EM) mixers are fundamental building blocks in communication systems. They used frequency/wavelength filters, interferometric modulators, amplitude-phase receivers, to name a few. Traditional EM have two or more input ports and work only for co-polarized signal local-oscillator (LO) incident on its inputs. Here we report novel designs, silicon, of inter-polarization operating at 1550 nm wavelength. The 180-degree optical mixer comprising single port is demonstrated...
We propose and demonstrate an integrated wavemeter capable of accurate broadband measurements without control or knowledge the temperature. In our design, interferometers composed silicon nitride waveguides enable input optical wavelength despite large rapid temperature fluctuations 20°C by leveraging disparity in thermo-optic properties waveguides. derive formulas which resolve ambiguity interferometers. The fabricated chip is found to have a mean accuracy 11 pm over 80 nm range near 1550...