Performance evaluation of an RZ-DQPSK/ASK label signal generated by a simple and conventional transmitters

• Main Author: 蔡昇祐
• Other Authors: 陳智弘
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/76656721347612500611

碩士 === 國立交通大學 === 光電工程系所 === 94 === Multilevel modulation signals like differential quadrature phase-shift keying (DQPSK) have received renewed attention to improve the spectral efficiency of a lightwave communication system. In this thesis, we provide a simple and cost effective method to generate DQPSK payload/ASK label signal which only needs two dual-drive Mach-Zehnder modulator (DD-MZM). First, we use bias position (bias=Vπ/2) and drive signal of dual-drive Mach-Zehnder modulator to generated DQPSK signal which replaced two Mach-Zehnder modulator. Second, we also used mixer to mix the sinwave and the low bit rate label data into Mach-Zehnder modulator replace pulse carver and ASK modulator. Finally, the thesis evaluate performance of conventional DQPSK/ASK label transmitter and dual-drive DQPSK/ASK label signal transmitter.