A5079869846- Photonic and Optical Devices
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Photorefractive and Nonlinear Optics
- Advanced Optical Network Technologies
- Spectroscopy and Quantum Chemical Studies
- Quantum and electron transport phenomena
- Photonic Crystals and Applications
- Optical Coherence Tomography Applications
- Neural Networks and Reservoir Computing
- Advanced Fiber Optic Sensors
- Solid State Laser Technologies
- Orbital Angular Momentum in Optics
- Optical Wireless Communication Technologies
- Telecommunications and Broadcasting Technologies
- Advanced Fluorescence Microscopy Techniques
- Optical Coatings and Gratings
- Advanced Wireless Communication Techniques
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- Advanced Memory and Neural Computing
- PAPR reduction in OFDM
Nokia (United States)
2016-2025
Providence College
2019-2020
Coherent Logix (United States)
2016
Alcatel Lucent (Germany)
2001-2007
Nortel (Canada)
2005
University of York
1998-2002
BT Research
1995
We demonstrate free-space space-division-multiplexing (SDM) with 15 orbital angular momentum (OAM) states using a three-dimensional (3D) photonic integrated circuit (PIC). The hybrid device consists of silica planar lightwave (PLC) coupled to 3D waveguide multiplex/demultiplex OAM states. low excess loss is used in individual and two simultaneous multiplexing demultiplexing link experiments 20 Gb/s, 1.67 b/s/Hz quadrature phase shift keyed (QPSK) signal, which shows error-free performance...
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...
An ATSC 3.0 physical layer frame consists of a bootstrap immediately followed by preamble containing 1 control signaling and then one or more subframes carrying payload data. Subframes within particular may be the same different types, with subframe types being configured for classes receivers (e.g., mobile versus fixed). This paper focuses on structure, configuration, contents, including boundary symbols which carry additional pilots to assist channel estimation at receiver cell...
We demonstrate two novel hybrid lasers with the same III-V ultrawideband gain medium. An III-V/Si laser and its III-V/SiO2 counterpart exhibit high fiber-coupled output power without booster semiconductor optical amplifier (up to +13 dBm for +10 III-V/SiO2) a record tuning range (respectively, 95 nm 66 nm) over C L bands side mode suppression ratio greater than 35 dB.
In ATSC 3.0, a bootstrap is used to enable service discovery and signaling reception at low signal levels. The 3.0 described in this paper. consists of several specially-coded OFDM symbols. first symbol for detection, synchronization, discovery. remaining symbols convey system parameters describing the associated physical layer frame structure, e.g., bandwidth, sampling rate. originating sequence combination Zadoff-Chu pseudo-noise frequency domain. Signaling information conveyed through use...
We realized a monolithic polarization-diversity dual-quadrature coherent receiver with on-chip balanced detection in silicon photonic integrated circuit germanium detectors. tested it using polarization-division multiplexed quadrature phase-shift keyed signal at 112-Gb/s.
Optical transport capacities have grown significantly in the last decade to meet increased demands on communications networks. This growth has been achieved both by increases individual channel rates, which are based time division multiplexing (TDM), and counts, through use of dense wavelength (DWDM). Yet increasing optical capacity alone is insufficient scale network; underlying data needs be delivered from numerous geographically diverse originating locations similarly terminating...
We demonstrate a complimentary metal-oxide-semiconductor (CMOS)-compatible and widely tunable filter with an integrated germanium detector. The uses two stages of sixth-order pole-zero filtering cascaded in vernier fashion to achieve simultaneous tunability adjustable passband bandwidth from 25 50 GHz tuned over wavelength range >12 nm. out-of-band crosstalk rejection is ~ 30 dB. monolithically detector has 6 GHz. also modified design which showed 11 GHz/s responsivity 0.75 A/W.
We present a 35nm tunable laser by hybrid integration between reflective semiconductor optical amplifier and an external cavity based on silica ring resonators Mach-Zehnder interferometer. demonstrate record low 2kHz line width.
We demonstrate a novel wavelength-tunable hybrid external cavity silicon-based transmitter with integrated reflectivity tunable mirror. First, designs of laser based on reflective symmetric and asymmetric Mach-Zehnder interferometer-based mirrors are studied single- double-ring intracavity filters, respectively. Asymmetric configuration is used in order to increase the tuning range single-ring by more than 90%. Furthermore, adjustment mirror allows for control characteristics, such as...
We report an 8/spl times/8 strictly nonblocking optical cross connect (OXC) using multimode imaging (MMI)-based generalized Mach-Zehnder (MZ) interferometers realized in the silica-on-silicon planar waveguide system. Employing a router-selector architecture, this MMI-MZ OXC design results significantly smaller device than conventional directional-coupler based implementations. An average insertion loss of 6 dB and crosstalk -34 dB, is demonstrated for OXC.
We report our experimental results for linear analog optical links that use phase or frequency modulation and discrimination. The discriminators are based on two architectures: a cascaded MZI FIR lattice filter ring assisted (RAMZI) IIR filter. For both types of discriminators, we demonstrate > 6 dB improvement in the link's third-order output intercept point (OIP3) over MZM link. show have low second-order distortion when using balanced detection. Using high power, an OIP3 39.2 dBm. also...
Record high sensitivity of 90dB is achieved in a chip-scale SS-OCT system. A PLC interferometer, on-chip balanced diode pair, and ball lens coupled MEMS mirror form an ultra-compact optical engine for 3D imaging.
Short reach communication systems, such as datacenters and access networks, exhibit steep capacity growth require opto-electronic technologies with small size, low complexity, power consumption. Here, we demonstrate large-scale arrays of reflective surface normal electroabsorption modulators (SNEAMs). With very active volumes, SNEAMs enable ultra-wide electro-optic bandwidth (>>65 GHz). We show modulation at 25 Gbit/s 1 Vpp drive voltage on packaged ultra-high bit-rate 107 bare chips. These...
It is shown theoretically that selective perturbation by electrorefractive effect of the even-order modes in III-V semiconductor multimode interference couplers gives rise to high-performance optical switching. The calculated performance proposed switch 3.4 GHz/Vmm, compared 0.85 GHz/Vmm for an equivalent Mach-Zehnder interferometer (MZI) switch. effects electroabsorption and dimension variations are analyzed demonstrate feasibility device.
An optimised ultra-low power thermo-optic waveguide switch design is presented. Under 25 mW consumption was achieved for standard index-contrast silica-on-silicon material with reduced polarisation-dependent switching performance.
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We demonstrate a central-office-type diplexer in which the filter and photodetector are monolithically integrated on silicon-on-insulator substrate. The photonic circuit receives 1577-nm signal from an external laser sends it to fiber link using two-dimensional grating coupler. same coupler 1270-nm germanium polarization-diversity scheme achieve polarization independence. is novel that both...
We present a reconfigurable optical discriminator filter for frequency modulated microwave-photonics link applications. The is based on simplified ring-assisted Mach-Zehnder interferometer configuration. It enables conversion of highly linear to amplitude modulation. Operations in fixed bandwidth (BW) 30 GHz and tunable from 10 are achieved using third- fifth-order filters. A balanced discrimination architecture with electronically transfer characteristics demonstrated. measured output-third...
We demonstrate an intelligent symmetric-rate 8- × 10-Gb/s bidirectional time and wavelength-division multiplexed passive optical network with 42-km reach 1:256 split 1425-nm laser pump light provides distributed Raman amplification for the upstream channels (allowing low-cost low-power transmitters), serves as a low-rate telemetry channel, powers splitter module that supervision mission-critical services.
In this paper, we introduce the design and fabrication of a high-power thermal test vehicle (TTV) equipped with two-phase cooling system, targeting improved management in Multi-Chip Modules (MCMs) for AI datacenters, 5G RAN, EDGE compute nodes. With rise device integration component power densities, conventional methods fall short, prompting need innovative approaches to achieve efficient heat dissipation. The TTV utilizes advanced heterogeneous techniques on low-temperature co-fired ceramic...
We describe a wide range of reconfigurable optical add-drop multiplexer architecture designs that may be implemented in standard silica-on-silicon planar lightwave circuits. This proven, reliable technology offers high performance and cost-effective solutions for reducing complex service provisioning networks. Recent advances enable very flexible wavelength routing devices mesh- ring-based networks to on common subsystem integration platform. show excellent system at 10 Gb/s.
We demonstrate orbital angular momentum state conversion using two 3D photonic integrated circuits for free-space communication of 20-Gb/s QPSK signals. Different combinations OAM states show error-free performance with 379,960 bits tested.