Performance evaluation of photonic Sigma Delta ADCS
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Authors
Tan, Yean Wee
Subjects
Advisors
Pace, Phillip E.
Date of Issue
2010-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
The integration of photonic and electronic components to realize a photonic sigma delta ADC is considered in this thesis. The integration process was broken up into steps. First, the performance of a pair of dual-port Mach-Zehnder interferometers (MZI) modulating a train of narrow high-speed laser pulses from a mode-locked laser was investigated. Various parameters like the half-wave voltage (V) and insertion loss were verified. Next, the ability of the MZIs to modulate the laser pulses, including the subtraction of two RF signals going into the two RF ports, was investigated. After that, the performance of a high-speed comparator circuit was evaluated. The comparator circuit was implemented using high-speed analog components capable of supporting data rates of up to 50 Gbps. The comparator components have to be tested individually and then integrated to ensure that they are able to amplitude analyze the modulated laser pulses using their respective matching threshold values. Lastly, the performance of the ring resonator, which was fabricated by the University of California Santa Barbara, was investigated. The ring resonator functions as an accumulator in the photonic ADC. In addition, a MATLAB simulation designed previously was used to simulate the behavior of the photonic sigma delta ADC. It was modified to speed up the simulation time and incorporate actual hardware parameters, including the time and amplitude jitter of the mode-locked laser. These laser parameters were characterized using a high-speed sampling oscilloscope. Thus, it was possible to predict the performance of the ADC under adverse effects as well as to show how the various electrical and optical signals appear at different parts of the circuit, which greatly adds to the efficiency of the integration process.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
xviii, 91 p. : col. ill. ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.