Optical I/Q Up-Conversion for Direct Detection Multi-Level Format OFDM Systems
| Autor: | Wong, Er-Zih, 翁而咨 |
|---|---|
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 We propose a novel all optical up-conversion direct detection OFDM multi-level system. Utilizing an external modulator, we can up-converse vector signals without electrical mixer based on single side band with carrier suppression. In order to generate 60GHz signals without expensive high-speed components, we using frequency quadrupling modulation technique. A record 28-Gb/s 16-QAM OFDM system within 7-GHz license-free band at 60 GHz employing all-optical up-conversion with frequency quintupling is experimentally demonstrated. Negligible penalty is observed following 100-km SMF transmission without any dispersion compensation. Besides, we also discuss imbalance effects and do compensation to improve signal quality. The imbalance factors include amplitude mismatch, conjugate misalignment and un-synchronization. Utilizing Gram-Schmidt Orthogonal procedure can successfully solve these problems. Finally, we also do some discussion on phase noise. It affects high data rate signals seriously. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|