This dissertation documents works on two projects, which are broadly related to
photonic integration using III-V semiconductor platform for fiber-based optical
communication. Our principal project aims to demonstrate continuous variable
quantum key distribution (CV-QKD) with InP-based photonic integrated cir cuit at the 1550 nanometer of optical wavelength. CV QKD protocols, in which
the key is encoded in the quadrature variables of light, has generated immense
interest over the years because of its compatibility with the existing telecom
infrastructure. In this thesis, we have proposed a design of a photonic inte grated circuit potentially capable of realizing this protocol with coherent states
of light. From the practical perspective, we have basically designed an optical
transmitter and an optical receiver capable of carrying out coherent communi cation via the optical fiber. Initially, we established a mathematical model of
the transceiver system based on the optical transfer matrix of the foundry spe cific (Fraunhofer Heinrich Hertz Institute-Germany) building blocks. We have
shown that our chip design is versatile in the sense that it can support multiple
modulation schemes. Based on the mathematical model, we estimated the link
budget to assess the feasibility of on-chip implementation of our protocol. Then
we ran a circuit level simulation using the process design kit provided by our
foundry to put our analysis on a better footing. The encouraging result from
this step prompted us to generate the mask layout for our transceiver chips,
which we eventually submitted to the foundry. The other project in the thesis
grew out of a collaboration with one of our industry partners. The goal of the
project is to enhance the performance of a distributed feedback laser emitting
at the 1310 nanometer of optical wavelength by optimizing its design. To that
end, we first derived the expression for transmission and reflection spectrum
for the laser cavity. Those expressions contained parameters which needed to
be obtained from the transverse and the longitudinal mode analysis of the laser.
We performed the transverse mode analysis and the longitudinal mode analysis
with commercially available numerical solvers. Those mode profiles critically
depend on the grating physical parameters. Therefore by tweaking grating dimensions one can control the transmission characteristics of the laser.
| Identifer | oai:union.ndltd.org:uottawa.ca/oai:ruor.uottawa.ca:10393/43460 |
| Date | 13 April 2022 |
| Creators | Paul, Tuhin |
| Contributors | Dolgaleva, Ksenia |
| Publisher | Université d'Ottawa / University of Ottawa |
| Source Sets | Université d’Ottawa |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
| Rights | Attribution-NonCommercial-NoDerivatives 4.0 International, http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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