On the effect of the extinction ratio and the modulation index on optical up conversion using DSBSC modulation and transmitting over different fiber links

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• 作者：Dhananjay Patel ; ^{dhananjaypatel76@yahoo.in" class="auth_mail" title="E-mail the corresponding author} ; ^{d14ec003@eced.svnit.ac.in" class="auth_mail" title="E-mail the corresponding author} ; Vinay Kumar Singh ; U.D. Dalal
• 关键词：Mach Zehnder modulator (MZM) ; Optical double sideband suppressed carrier (DSBSC) ; Extinction ratio (ER)
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：127
• 期：24
• 页码：11845-11853
• 全文大小：1802 K

文摘

Several methods of millimeter wave up conversion based on Double Sideband Suppressed Carrier (DSBSC), Double Sideband with Carrier (DSB-C) and Single Sideband (SSB) using Mach Zehnder Modulator (MZM) have been reported. The DSBSC provides high receiver sensitivity, high spectral efficiency against DSB-C and SSB Modulation techniques. However, the signal in DSBSC suffers due to non linear electro-optical conversion response and imperfect power splitting ratio of the MZM. The imperfect splitting ratio of the MZM is caused by asymmetric power-splitting Y-branches due to the fabrication tolerances leading to a finite Extinction Ratio (ER). If this signal is transmitted over a fiber, it will suffer more degradation due to the chromatic dispersion, thus reducing the transmission distance. In this paper, the impact of the ER and the Modulation Index (MI) on the carrier and the higher order sidebands suppression in DSBFC is analyzed theoretically and by simulation. Our results show that, with the on optimum selection of the ER and the MI of the MZM, Optical Carrier Suppression Ratio (OCSR) and higher order sideband suppression ratio (SSR) increases. The analysis is further extended to determine the effect of chromatic dispersion over different lengths of the fiber. The results obtained by numerical analysis and by simulation show excellent agreement.