11 November 2008 QAM transmission system based on heterodyne optical detection using intermediate frequency carrier modulation
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Proceedings Volume 7136, Optical Transmission, Switching, and Subsystems VI; 713619 (2008) https://doi.org/10.1117/12.803308
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China
Abstract
Compared with the optical communication system using intensity modulation with direct detection (IM-DD), the coherent optical system enhances the sensitivity and enables access to all the optical characteristics. In this paper, a novel scheme of coherent QAM transmission system based on heterodyne optical detection is experimentally demonstrated. In the proposed scheme, the intermediate frequency (IF) carrier modulation at double-sideband suppressed carrier (DSB-SC) mode at the transmitter side enables demodulation of QAM signal with heterodyne detection. Furthermore, the receiver is simplified by avoiding the use of high frequency broadband microwave devices due to the employment of IF carrier modulation. The performance of the proposed coherent QAM system is analyzed theoretically based on numerical simulation. The simulation results show that the improved structure of the proposed system can effectively depress the phase noise induced by laser. An experiment of 4-QAM transmission exploiting the proposed coherent heterodyne system is presented to justify the principle.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ran Zhu, Kun Xu, Ye Zhang, Yan Li, Jian Wu, Xiaobin Hong, and Jintong Lin "QAM transmission system based on heterodyne optical detection using intermediate frequency carrier modulation", Proc. SPIE 7136, Optical Transmission, Switching, and Subsystems VI, 713619 (11 November 2008); doi: 10.1117/12.803308; https://doi.org/10.1117/12.803308
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