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Open AccessArticle

Irregular Shifting of RF Driving Signal Phase to Overcome Dispersion Power Fading

Department of Electrical Engineering, Universitas Indonesia, Jawa Barat 16424, Indonesia
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Photonics 2019, 6(4), 104; https://doi.org/10.3390/photonics6040104
Received: 5 September 2019 / Revised: 2 October 2019 / Accepted: 9 October 2019 / Published: 12 October 2019
The main problem with the radio-over-fiber (RoF) link is the decrease in the recovered radio frequency (RF) power due to the chromatic dispersion of the fiber known as dispersion power fading. One of the methods for dealing with dispersion power fading is to use the optical single sideband (OSSB) modulation scheme. The OSSB modulation scheme can be generated by biasing the dual-drive Mach–Zehnder modulator (DD-MZM) to the quadrature bias point (QBP) and shifting the RF drive signal phase (θ) by 90°, which is called the regular θ. However, the OSSB modulation scheme only overcomes dispersion power fading well at the modulation index (m) < 0.2. This paper proposes an irregular θ method to overcome dispersion power fading at all m. There are two irregular θ for every m used. The irregular θ managed to handle dispersion power fading better than OSSB modulation scheme did at every m. Specifically, the irregular θ could handle the dispersion power fading well at m ≤ 1. In sum, the irregular θ could overcome the dispersion power fading at any RF frequency and optical wavelength without having to re-adjust the transmitter. View Full-Text
Keywords: radio over fiber; dispersion power fading; dual-drive Mach–Zehnder modulator (DD-MZM); irregular phase shift radio over fiber; dispersion power fading; dual-drive Mach–Zehnder modulator (DD-MZM); irregular phase shift
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Ujang, F.; Firmansyah, T.; Priambodo, P.S.; Wibisono, G. Irregular Shifting of RF Driving Signal Phase to Overcome Dispersion Power Fading. Photonics 2019, 6, 104.

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