Oct 20, 2017
Lopata Hall, Room 101
"Polarization Division Multiplexing for Optical Data Communications"
Adviser: Roger Chamberlain
Multiple parallel channels are ubiquitous in optical communications, with spatial division multiplexing (separate physical paths) and wavelength division multiplexing (separate optical wavelengths) being the most common forms. Here, we investigate the viability of polarization division multiplexing, the separation of distinct parallel optical communication channels through the polarization properties of light. Two or more linearly polarized optical signals (at different polarization angles) are transmitted through a common medium, filtered using aluminum nanowire optical filters fabricated on-chip, and received using individual silicon photodetectors (one per channel).
In this DSS talk we present the following: (1) the design and implementation of a Verilog-A model for division-of-focal-plane optical polarization filters; (2) the calibration of the simulation model from empirical measurements; (3) the design, analysis, and simulation of several polarization division multiplexed optical communications systems; (4) the (simulation-based) characterization of the properties of the optical communications channels under realistic conditions; and (5) preliminary promising experimental test data of fabricated custom integrated chip that performs the same parallel optical communication channels through the polarization properties of light.
"Blockchain Technology for Network Security Applications"
Adviser: Raj Jain
Due to its distributed and decentralized consensus nature, blockchain technology has recently gained a lot of interest by researchers and industries. It was originally designed and most currently known for its cryptocurrency and financial applications. But it is not only restricted to these applications and this talk is designed to show its use for network security applications. Security services of interest include public key infrastructure (PKI), data provenance, integrity assurance, and data and user privacy. All these services are critical for distributed applications, but currently done by a centralized controller, for example a certificate authority. Thus, subject to many attacks on these centralized controllers. The talk explains blockchain technology and its important aspects and properties. Then focus on the security services, give insights on their current and state of the art techniques, state their challenges and discuss how blockchain technology can be used to resolve these challenges. Further, we summarize several blockchain-based approaches used to provide such security services. Finally, we discuss challenges in using blockchain-based security applications to spur further research in this area.