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High-Order Ultrawideband Pulse Generation from NRZ-DPSK Signals
作者姓名:董建绩  张新亮  余宇  徐竞  黄德修
作者单位:Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
基金项目:Supported by the National High Technology Developing Program of China under Grant No. 2006AA03Z0414, the National Basic Research Program of China under Grant No. 2006CB302805 and the New Century Excellent Talent Project in Ministry of Education of China under Grant No. NCET-04-0715.
摘    要:A simple method to generate ultrawideband (UWB) doublet and triplet from nonreturn-to-zero (NRZ) differential phase shift keying (DPSK) signals is proposed and experimentally demonstrated. The proposed configuration consists of a Mach-Zehnder modulator (MZM) to generate NRZ-DPSK signals, a section of single-mode fibre to form a microwave bandpass filter, which is used to generate doublet pulses, and a Gaussian optical bandpass filter (OBF), which serves as a frequency discriminator to generate higher-order UWB pulses. A pair of polarity- reversed triplet pulses is achieved by locating the optical carrier at the positive and negative linear Mopes of the OBF, where the OBF detuning is 0.12nm and -0.2 nm, respectively. The spectra of the pair of UWB triplets have a central frequency of 5 GHz and 5.6 GHz, and have a -10 dB bandwidth of 6.9 GHz and 8.1 GHz, respectively. The UWB pulses remain doublet shape when the light wavelength is located at the peak of the OBF. The spectrum of the doublet has a central frequency of 5.6 GHz and a -10 dB bandwidth of 6.9 GHz.

关 键 词:超宽频带  NRZ-DPSK  信号系统  物理学
收稿时间:2007-08-19

High-Order Ultrawideband Pulse Generation from NRZ-DPSK Signals
DONG Jian-Ji,ZHANG Xin-Liang,YU Yu,XU Jing,HUANG De-Xiu.High-Order Ultrawideband Pulse Generation from NRZ-DPSK Signals[J].Chinese Physics Letters,2008,25(3):911-914.
Authors:DONG Jian-Ji  ZHANG Xin-Liang  YU Yu  XU Jing  HUANG De-Xiu
Institution:Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
Abstract:A simple method to generate ultrawideband (UWB) doublet and triplet from nonreturn-to-zero (NRZ) differential phase shift keying (DPSK) signals is proposed and experimentally demonstrated. The proposed configuration consists of a Mach--Zehnder modulator (MZM) to generate NRZ-DPSK signals, a section of single-mode fibre to form a microwave bandpass filter, which is used to generate doublet pulses, and a Gaussian optical bandpass filter (OBF), which serves as a frequency discriminator to generate higher-order UWB pulses. A pair of polarity-reversed triplet pulses is achieved by locating the optical carrier at the positive and negative linear slopes of the OBF, where the OBF detuning is 0.12nm and -0.2nm, respectively. The spectra of the pair of UWB triplets have a central frequency of 5GHz and 5.6GHz, and have a -10dB bandwidth of 6.9GHz and 8.1GHz, respectively. The UWB pulses remain doublet shape when the light wavelength is located at the peak of the OBF. The spectrum of the doublet has a central frequency of 5.6GHz and a -10dBbandwidth of 6.9GHz.
Keywords:33  20  Bx  42  79  Sz  42  81  -i
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