標題: Impact of Nonlinear Transfer Function and Imperfect Splitting Ratio of MZM on Optical Up-Conversion Employing Double Sideband With Carrier Suppression Modulation
作者: Lin, Chun-Ting
Chen, Jason (Jyehong)
Dai, Sheng-Peng
Peng, Peng-Chun
Chi, Sien
光電工程學系
Department of Photonics
關鍵字: Microwave photonics;millimeter-wave (mm-wave) generation;Mach-Zehnder modulator (MZM);MZM imbalance;MZM nonlinearity;radio-over-fiber (RoF)
公開日期: 1-七月-2008
摘要: Generation of optical millimeter-wave (mm-wave) signal using a Mach-Zehnder modulator (MZM) based on double-sideband (DSB), single-sideband (SSB), and double-sideband with carrier suppression (DSBCS) modulation schemes have been demonstrated for various applications, such as broadband wireless signals or optical up-conversion for wavelength-division-multiplexing (WDM) radio-over-fiber (RoF) network, wideband surveillance, spread spectrum, and software-defined radio. Among these schemes, DSBCS modulation offers the best receiver sensitivity, lowest spectral occupancy, the least stringent requirement of electrical bandwidth, and the smallest receiving power penalty after long transmission distance. Nonetheless, the inherent nonlinear E/O (electrical/optical) conversion response of a MZM is such that the signal quality of the optical mm-wave suffers. Fabrication tolerances make a balanced 50150 splitting ratio of the MZM's y-splitter particularly difficult to achieve. As a result, imbalanced MZMs have a finite extinction ratio (ER) and degrade the optical carrier suppression ratio (OCSR) using DSBCS modulation. In this paper, the effect of the MZM nonlinearity and imbalanced y-splitter on optical mm-wave generation by DSBCS modulation is theoretically and experimentally investigated. A novel approach with better performance and greater cost-effectiveness than dual-electrode MZM (DD-MZM) is presented to realize a DSBCS modulation scheme based on a single-electrode MZM (SD-MZM).
URI: http://dx.doi.org/10.1109/JLT.2008.927160
http://hdl.handle.net/11536/8649
ISSN: 0733-8724
DOI: 10.1109/JLT.2008.927160
期刊: JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume: 26
Issue: 13-16
起始頁: 2449
結束頁: 2459
顯示於類別:期刊論文


文件中的檔案:

  1. 000260874000083.pdf