Power fading elimination and linearization for a dispersive optical true time delay using carrier phase shifting and optical sideband processing

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• 作者：Xuan Li^a ; ^b ; ^{lixuanrch@163.com" class="auth_mail" title="E-mail the corresponding author} ; Shanghong Zhao^a ; Zihang Zhu^a ; ^b ; Yun Liu^a ; Jing Zhao^a ; Xinping Miao^a
• 关键词：Optical true time delay ; Dispersion ; Power fading effect ; Linearization
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：126
• 期：23
• 页码：3949-3953
• 全文大小：688 K

文摘

A dispersive optical true time delay (OTTD) free from received RF power fading effect and third-order intermodulation distortion (IMD3) is proposed and investigated. In the transmitter, the carrier phase shifting (CPS) technique with optical double-sideband (ODSB) signal is used to eliminate the RF power fading by employing an integrated modulator. The output of the integrated modulator is an ODSB signal that the optical carrier (OC) can be shifted separately. In the receiver, the optical sideband processing technique is used to eliminate the IMD3 by employing a compensator. The two major origins of the IMD3 have identical intensity and opposite phase through the modulation of the compensator. Simulation results show that, the received RF power has no fading effect when the phase of carrier is optimized, and the IMD3 is efficiently suppressed and the fundamental to IMD3 ratio (FIR) can be improved more than 45 dB when the optical sideband processing technique is used.