Two-Band QAM Data Transmission using Parallel Mach-Zehnder Modulators in RoF System
Joseph Zacharias1, Vijayakumar Narayanan2

1Joseph Zacharias, Department of Electronics, Rajiv Gandhi Institute of Technology (RIT), Kottayam, Kerala, India.
2Vijayakumar Narayanan, Dept. Of Electronics, Government Engineering College, Barton Hill, Trivandrum, Kerala, India. 

Manuscript received on 13 April 2017 | Revised Manuscript received on 20 April 2017 | Manuscript Published on 30 April 2017 | PP: 118-121 | Volume-6 Issue-4, April 2017 | Retrieval Number: D4930046417/17©BEIESP
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Abstract: A radio over fiber (RoF) system with the transmission of two QAM sidebands by using two parallel Mach-Zehnder modulator is proposed. Optical comb generation at the central station (CS) helps to produce two combs from a single laser diode. This RoF system uses dual parallel Mach-Zehnder modulators (MZM) for the transmission of two QAM modulated sidebands. In one branch of the MZM, 4-QAM data is transmitted while in the other 16-QAM data is transmitted. Finally the downlink performance of the RoF system can be analyzed by using signal constellations and eye diagrams.
Keywords: Comb Generation, Quadrature Amplitude Modulation (QAM), Radio Over Fiber (RoF).

Scope of the Article: Radio Networks