QAM transmission system based on heterodyne optical detection using intermediate frequency carrier modulation

Ran Zhu; Kun Xu; Ye Zhang; Yan Li; Jian Wu; Xiaobin Hong; Jintong Lin

doi:10.1117/12.803308

11 November 2008 QAM transmission system based on heterodyne optical detection using intermediate frequency carrier modulation

Ran Zhu, Kun Xu, Ye Zhang, Yan Li, Jian Wu, Xiaobin Hong, Jintong Lin

Author Affiliations +

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.

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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); https://doi.org/10.1117/12.803308

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KEYWORDS

Quadrature amplitude modulation

Modulation

Heterodyning

Receivers

Signal detection

Homodyne detection

Phase shift keying

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