| Title: |
Χρήση αυτορυθμιζόμενων ηλεκτρονικών εξισωτών σε οπτικά τηλεπικοινωνιακά συστήματα και δίκτυα με πυκνή πολυπλεξία μήκους κύματος και ρυθμό σηματοδοσίας 10 GB/S ανά οπτικό κανάλι ; Adaptive electronic equalizers for optical communication systems and networks with dense wavelength multiplexing and baud rated 10 GB/s per optical channel |
| Authors: |
Vgenis, Athanasios; Βγένης, Αθανάσιος |
| Publisher Information: |
University of Patras; Πανεπιστήμιο Πατρών |
| Publication Year: |
2010 |
| Collection: |
National Archive of PhD Theses (National Documentation Centre Greece) |
| Subject Terms: |
Ηλεκτρονικές εξισώσεις; Προσαρμοστικές εξισώσεις; Οπτικές τηλεπικοινωνίες; Διασπορά τρόπων πόλωσης; Χρωματική διασπορά; Πολυπλέξη κατά πόλωση; Εξισωτής ελάχιστου μέσου τετραγώνου; Εξισωτής σταθερής περιβάλλουσας; Electronic equalization; Adaptive equalization; Optical communications; Polarization mode dispersion; Chromatic dispersion; Polarization multiplexing; Least mean square algorithm; Constant modulus algorithm; Επιστήμες Μηχανικού και Τεχνολογία; Επιστήμη Ηλεκτρολόγου Μηχανικού; Ηλεκτρονικού Μηχανικού; Μηχανικού Η/Υ; Engineering and Technology; Electrical Engineering; Electronic Engineering; Information Engineering |
| Description: |
This PhD dissertation focuses on optical communication systems utilizing coherent receiverquadrature phase modulation and polarization multiplexing. Their main advantage compared to conventional systems is the ability to perform extended digital signal processing in order to compensate for transmission effects and to successfully demultiplex polarization multiplexed signals. We study such DSP modules with the help of computer simulations. We propose two novel polarization demultiplexing algorithms with advantages in performance reliability and convergence speed compared to conventional methods. One of the two methods utilizes training procedure an approach not yet studied enough in the literature. Next, we study the performance of least mean square and constant modulus algorithm equalizers in mitigating chromatic dispersion and polarization mode dispersion both separately and in combination. We include in our study phase noise and intermediate frequency offset without the simplifications usually found in the literature. Next, we address the subject of equalizer degeneration which describes the phenomenon when both equalizer outputs transmit one of the two polarization multiplexed signals. We propose the use of multi-user constant modulus algorithm which is an enhanced version of the conventional constant modulus algorithm. We prove that our solution has excellent performance as well as reliability and simplicity advantages compared to other methods. Next, we prove that quadrature imbalance is a ubiquitous phenomenon that cannot be addressed with conventional electronic equalizers and should not be omitted as is often the case. Finally, we present results derived from the application of some of the proposed algorithms on real experimental data and prove the consistency of the theoretical derived results. ; Η παρούσα διατριβή εστιάζεται σε οπτικά τηλεπικοινωνιακά συστήματα με σύμφωνο δέκτη τετραδική διαμόρφωση φάσης και πολύπλεξη κατά πόλωση. Το κυριότερο πλεονέκτημα αυτών των συστημάτων σε σύγκριση με τα ... |
| Document Type: |
doctoral or postdoctoral thesis |
| Language: |
Greek, Modern (1453-) |
| Relation: |
https://hdl.handle.net/10442/hedi/25681 |
| DOI: |
10.12681/eadd/25681 |
| Availability: |
https://hdl.handle.net/10442/hedi/25681; https://doi.org/10.12681/eadd/25681 |
| Accession Number: |
edsbas.8E9BDF38 |
| Database: |
BASE |