Spatial multiplexing in optical communications
Abstract/Contents
- Abstract
- The information capacity of optical communication systems can be increased by multiplexing signals in co-propagating spatial and polarization modes of multimode or multicore fibers. In this dissertation, we discuss some fundamental aspects of spatial multiplexing in long-haul and short-reach transmission systems. We describe methods for modeling the temporal dynamics of modes in the presence of random environmental vibrations and show, both theoretically and experimentally, that the rate of channel dynamics increases with the number of coupled modes. We study the implications of fast channel dynamics on the adaptive multiple-input multiple-output digital signal processing at the receiver. Furthermore, we discuss the combined impact of mode-dependent gain and modal dispersion on the capacity of spatially multiplexed links, and derive the requirements for optical amplifiers in ultra-long-haul systems. We propose techniques for optical equalization using meshes of Mach-Zehnder interferometers. In particular, we evaluate the performance of the self-configuration method to configure mesh phase shifters and propose variants of this method that can track microsecond timescale channel dynamics. Finally, we propose novel design algorithms to optimize fiber refractive index profiles for various applications. Our algorithms enable effective control of fiber properties such as mode coupling, chromatic and modal dispersions.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Choutagunta Nagaraj, Karthik Kumar |
|---|---|
| Degree supervisor | Kahn, Joseph |
| Thesis advisor | Kahn, Joseph |
| Thesis advisor | Miller, D. A. B |
| Thesis advisor | Solgaard, Olav |
| Degree committee member | Miller, D. A. B |
| Degree committee member | Solgaard, Olav |
| Associated with | Stanford University, Department of Electrical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Karthik Kumar Choutagunta Nagaraj. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Karthik Kumar Choutagunta Nagaraj
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Also listed in
Loading usage metrics...