Ripple suppression in broadband microwave photonic phase shifter frequency response

Weicheng Xia, Ruiqi Zheng, Bijuan Chen, Erwin H.W. Chan, Xudong Wang, Xinhuan Feng, Bai Ou Guan

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Abstract

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.

Original languageEnglish
Article number2433
Pages (from-to)1-10
Number of pages10
JournalApplied Sciences (Switzerland)
Volume8
Issue number12
DOIs
Publication statusPublished - 30 Nov 2018

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phase response
Phase shifters
ripples
phase deviation
Photonics
frequency response
couplers
Frequency response
Microwaves
retarding
photonics
broadband
microwaves
radio frequencies
deviation
output
optical filters
sidebands
frequency modulation
dynamic range

Cite this

Xia, Weicheng ; Zheng, Ruiqi ; Chen, Bijuan ; Chan, Erwin H.W. ; Wang, Xudong ; Feng, Xinhuan ; Guan, Bai Ou. / Ripple suppression in broadband microwave photonic phase shifter frequency response. In: Applied Sciences (Switzerland). 2018 ; Vol. 8, No. 12. pp. 1-10.
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abstract = "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.",
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Ripple suppression in broadband microwave photonic phase shifter frequency response. / Xia, Weicheng; Zheng, Ruiqi; Chen, Bijuan; Chan, Erwin H.W.; Wang, Xudong; Feng, Xinhuan; Guan, Bai Ou.

In: Applied Sciences (Switzerland), Vol. 8, No. 12, 2433, 30.11.2018, p. 1-10.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Ripple suppression in broadband microwave photonic phase shifter frequency response

AU - Xia, Weicheng

AU - Zheng, Ruiqi

AU - Chen, Bijuan

AU - Chan, Erwin H.W.

AU - Wang, Xudong

AU - Feng, Xinhuan

AU - Guan, Bai Ou

PY - 2018/11/30

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N2 - 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.

AB - 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.

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KW - Optical signal processing

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