双平行马赫-曾德尔调制器的单边带RoF系统

doi:10.3969/j.issn.1001-2400.2012.02.001

Abstract

Abstract:

In the radio over fiber(RoF) system, the difference in power between optical carrier and optical sideband is large using the conventional optical single sideband with carrier(OSSB+C) modulation, resulting in lower receiver sensitivity. An improved method to generate OSSB+C signals is thus proposed based on the dual-parallel Mach-Zehnder modulator(MZM). By adjusting the direct current voltage of the MZM, the balanced power between the optical carrier and optical sideband is obtained for any modulation index, i.e., the value of the carrier-to-sideband ratio(CSR) is 0dB which is optimum. Simulation results show that the receiver sensitivity could be improved by as large as 7.8dB for the small modulation indexes, while about 0.7dB to 1.1dB for the medium and large modulation indexes. In addition, the influence of the drift of direct current bias voltage on the CSR and receiver sensitivity is also analyzed by simulation. The results show that if the bias drift is controlled within the range of 5％, the receiver sensitivity degrades a little, and the RoF system based on the proposed technique has the better robustness.

Key words: optical communication, radio over fiber, optical modulation, Mach-Zehnder modulator, carrier to sideband ratio

CLC Number:

TN929.11

LIU Xiangling;HAN Kun;LI Jiandong;YUE Peng. Generation of optical single sideband with carrier signals using the dual-parallel Mach-Zehnder modulator in the radio over fiber system[J].J4, 2012, 39(2): 1-7.

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[1]	LI Xiao-jun;LIU Zeng-ji;WEN Ai-jun;Lü Liang. Demodulation scheme and transmission performance study of the DOPSK signal in optical communication [J]. J4, 2009, 36(4): 669-674.
[2]	LI Xiao-jun1;2;WEN Ai-jun1;LIU Zeng-ji1;SHANG Tao1;ZHAI Wan-teng1. Chromatic dispersion performance analysis of ODPASK modulation format in optical communication [J]. J4, 2008, 35(5): 823-829.

Generation of optical single sideband with carrier signals using the dual-parallel Mach-Zehnder modulator in the radio over fiber system

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