Thursday, November 5th, 10 am (PST) via Zoom
Lithium niobate (LN), the workhorse of optoelectronics, is an excellent photonic material with large electro-optic coefficient, Kerr nonlinearity and piezoelectric response, and a wide optical transparency window. Recent advances in nanofabrication technology have allowed for the realization of ultra-low loss LN waveguides and are opening exciting opportunities for next-generation nonlinear photonic technologies with higher integration density and advanced functionalities. In this talk, I will review our recent developments of thin-film LN devices, including optical frequency combs, supercontinuum generation, optical frequency shifting, acousto-optic control. In addition, I will discuss the potential of LN platform for applications in nonlinear frequency conversion, frequency metrology, and microwave photonics.
Following the technical talk, I will give a short professional development talk, including networking and volunteering in the photonics community, and I will cover some career advice for graduate students.
Images from https://arxiv.org/pdf/2005.09621.pd
Monday, October 26th, 11 am (PDT) via Zoom
Fiber communications support a wide range of residential, mobile and enterprise services, within core, metro, and access optical networks. The 5G and beyond wireless is expected to have a dramatic impact on the fiber infrastructure, bringing new severe requirements such as higher data rates, ultra-high bandwidth, lower latency, accurate synchronization, network slicing, ultra-high reliability and massive connectivity for many devices. Adaptive, flexible and efficient optical resource management, as well as agile bit-rates are the key technologies to exploit the whole bandwidth of single-wavelength, single-core and single-mode fibers. All-optical orthogonal frequency division multiplexing (OFDM) and Nyquist-optical time division multiplexing (N-OTDM) are the two most suitable approaches to efficiently generate Tb/s superchannels, by optically multiplexing subcarriers or by time interleaving short sinc-shaped pulses. The superchannels are generated in the optical domain, in a power-efficient way, also overcoming the restrictions related to the bandwidth of modulators and digital signal processing devices. A planar arrayed waveguide grating (AWG) can be designed to implement the conventional or fractional Fourier transform and efficiently generate OFDM and Fr-OFDM superchannels, that are less sensitive to nonlinear distortion and chromatic dispersion effects. The ultimate efficiency in physical resource exploitation can be achieved only in a truly flexible system, where it is possible to switch from OFDM to N-OTDM and vice versa, through intermediate fractional grids. Starting from experimental results of a novel approach for hybrid time-frequency multiplexing, this talk will focus on additional multiplexing domains, such as polarization, space, wavelength and code. Suitable AWG configurations can be designed for simultaneous frequency and polarization or mode and frequency multiplexing, as well as for generating optical codes in asynchronous code division multiple access (CDMA) and optical packet switching systems.
Image from https://doi-org/0.1364/OE.25.00349
Gabriella Cincotti is a Full Professor at the Engineering Department, University Roma Tre, Rome Italy; she leads the Photonics Research Group and is in charge of the courses of Photonics and Biophotonics. She is a Fellow of the Optical Society of America (OSA), she was an elected member of the Board of Governors of the IEEE Photonics Society (2017-2019) and currently she is serving in the IEEE Photonics Publications Council. She was a technical program committee (TPC) member of the European Conference on Optical Communications (ECOC) (2010-2012), also serving as Chair of the Access Subcommittee. She was also TPC member of the Optical Fiber Communication Conference (OFC) (2016-2018). She served as an Associate Editor of Optics Letters (2008-2014) and she serves as Deputy Editor of Optica since 2017. She has authored or co-authored over 300 research papers in leading journals and conferences. Her main research interests are in the field of planar lightwave circuits, photonic devices and subsystems for high-speed optical signal processing. Recently, she moved part of her research interests toward super resolution imaging and point of care testing for biomedical and microbiological applications.
Dr. Christian Reimer - From Academia to Co-founding HyperLight -- Developing Integrated Lithium Niobate Technologies for High-performance Photonic Solutions
Friday, October 23rd, 11 am (PDT) via Zoom
Dr. Christian Reimer is a physicist and entrepreneur working in the fields of nonlinear optics, integrated photonics and quantum optics. He received graduate degrees from the Karlsruhe Institute of Technology in Germany, Heriot-Watt University in Scotland, and the National Institute of Scientific Research in Canada. He then worked as a postdoctoral fellow at Harvard University, before becoming Co-Founder and Head of Product of HyperLight Corporation. HyperLight, a Venture-Capital funded start-up out of Harvard University, is specialized on integrated lithium niobate technologies for ultra-high performance photonic solutions.
In the scientific part of his talk, Christian will introduce the field of integrated photonics based on thin-film lithium niobate, with a focus on electro-optic applications, as well as recent progress on transforming the field from chip-based proof-of-concept realizations for wafer-scale production. In the professional development section, he will then share his experience transitioning from academia to a start-up company. He will talk about differences and similarities in the work environment, what to expect in terms of tasks and responsibilities, and explain how salaries at start-ups can include combinations of equity and incentives.
Images from hyperlightcorp.com
Friday, Oct. 16th, 4 pm (PDT) via Zoom
Henley Hall will hold state-of-the-art research facilities for developing energy-efficient technologies. Prof. Bowers will present the research capabilities and expected research ramp-up timeline for the new building.
Thursday, Oct. 8, 1-2 pm (PDT) via Zoom
Meeting ID: 819 4601 6935, Password: 597044
Entanglement and encoding in discrete frequency bins – a quantum analogue of wavelength-division multiplexing – represents a relatively new degree of freedom for quantum information with photons. Potential advantages include generation of high-dimensional units of quantum information called qudits, which can carry multiple qubits per photon; robust transmission over fiber; frequency parallelism and routing; and compatibility with on-chip implementations, as well as hyperentanglement with other photonic degrees of freedom. In this talk I first give an overview of manipulating and measuring quantum states encoded and entangled in the photonic frequency degree of freedom. I will then discuss our recent experiments that focus on high-dimensional entanglement and mixing of multiple frequency bins in a single operation, going well beyond nearest neighbor “interactions.
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