Influence of the modulation index of Mach-Zehnder modulator on RoF link with ASK millimeter-wave signal |
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Authors: | Jianxin Ma Jianjun Yu Xiangjun Xin |
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Institution: | a Key Lab of Optical Communication and Lightwave Technologies (MOE), School of Electric Engineering, Beijing University of Posts and Telecommunications, Xitucheng Road #10, Haidian District, Beijing 100876, China b School of Computer and Telecommunication, Hunan University, Changsha 410082, China |
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Abstract: | In this paper, the influence of the modulation index of LiNbO3 Mach-Zehnder modulator on the radio over fiber (RoF) link based on single sideband (SSB) optical millimeter (mm)-wave with ASK signal is theoretically and numerically investigated. Our investigation shows that there exists an optimal modulation index to generate the SSB optical mm-wave with a maximal RF photocurrent. Although the fiber dispersion distorts the code form and degrades the performance of the RF signal demodulated from the SSB optical mm-wave after fiber transmission, it does not cause the closure of the eye diagram. However, the influence of the fiber dispersion becomes more obvious as the modulation index increases. For the duplex RoF link with the optical carrier of the uplink recovered from the downlink, a larger modulation index of the downlink causes a worse crosstalk from the downlink to the uplink. |
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Keywords: | Radio over fiber (RoF) Optical millimeter (mm)-wave Single sideband (SSB) modulation |
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