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Open AccessArticle

Ripple Suppression in Broadband Microwave Photonic Phase Shifter Frequency Response

1
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
2
College of Engineering, IT and Environment, Charles Darwin University, Darwin NT 0909, Australia
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2433; https://doi.org/10.3390/app8122433
Received: 2 November 2018 / Revised: 24 November 2018 / Accepted: 24 November 2018 / Published: 30 November 2018
(This article belongs to the Special Issue Microwave Photonics 2018)
This paper presents a detailed investigation on the cause of ripples in the frequency response of a microwave photonic phase shifter implemented using a 90° hybrid coupler. It was found that an unwanted radio frequency (RF) modulation sideband is generated at the modulator output due to the 90° hybrid coupler amplitude and phase imbalance. This resulted in phase shifter output RF signal amplitude variation and phase deviation. Experimental results demonstrated that incorporating an optical filter in the phase shifter structure can reduce the amplitude variation and phase deviation from 4.2 dB to 2.2 dB and from ±12° to ±3.8°, respectively, over a wide frequency range. A comparison of the loss and the dynamic range of the microwave photonic phase shifter implemented using a 90° hybrid coupler with a conventional fiber optic link is also presented. View Full-Text
Keywords: microwave photonics; optical signal processing; phase shifters microwave photonics; optical signal processing; phase shifters
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MDPI and ACS Style

Xia, W.; Zheng, R.; Chen, B.; Chan, E.H.W.; Wang, X.; Feng, X.; Guan, B.-O. Ripple Suppression in Broadband Microwave Photonic Phase Shifter Frequency Response. Appl. Sci. 2018, 8, 2433.

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