Reconfigurable microwave photonic mixer for hybrid macro-micro cellular systems

Gao, Yongsheng; Shi, Fangjing; Zhang, Jing; Cao, Biao; Ma, Boyuan; Zhai, Weile; Fan, Yangyu

doi:10.1364/oe.481373

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…Path mismatch or environmental variation may lead to reduced accuracy [9]. The latest microwave photonic mixer based on the Hartley architecture has been reported in [21]. Experimental results indicate an image frequency rejection of over 60 dB, with an operating frequency ranging from 5 to 20 GHz.…”

Section: Introductionmentioning

confidence: 99%

Broadband Microwave Photonic Mixer With High Spurs Suppression and Image Rejection

Shen,

Zhou

2024

IEEE Photonics J.

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Abstract-A microwave photonic mixer for up-and downconversion based on dual parallel in-phase and quadrature (I/Q) modulators is proposed. Dual parallel I/Q modulators and 90degree electrical hybrid couplers are used to obtain carriersuppressed single-sideband modulation of radio frequency (RF), intermediate frequency (IF), and local oscillator (LO) signals.The optical bandpass filter (OBPF) is employed to select the -1storder or +1st-order sideband of the LO signal to realize up and down conversion. In the experiments, an IF frequency range of 5-17 GHz can be upconverted to an RF frequency range of 15-37 GHz, and an RF frequency range of 8-40 GHz can be downconverted to an IF frequency range of 2-5 GHz. The spurs suppression ratio exceeds 50 dB for up and down conversion. To the best of our knowledge, this is the highest reported spurs suppression in a broadband microwave photonic mixer. Moreover, the OBPF is also utilized to obtain an image rejection ratio (IRR) of 45.91 dB at an IF frequency of 4 GHz. To obtain a lower frequency of IF signal and a higher IRR, a Brillouinassisted notch filter is applied to attenuate the image signal. In this way, an IRR of more than 60 dB can be obtained at an IF frequency of 2 GHz.

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Section: Introductionmentioning

confidence: 99%

Broadband Microwave Photonic Mixer With High Spurs Suppression and Image Rejection

Shen,

Zhou

2024

IEEE Photonics J.

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High-accuracy measurement system for rotor-stator axial clearance in narrow spaces based on all-fiber microwave photonic mixing

Yu¹,

Liu

Duan³

et al. 2023

Opt. Express

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In this paper, a high-accuracy measurement method for rotor-stator axial clearance in narrow spaces is proposed. The optical path structure based on all-fiber microwave photonic mixing is established. To improve the accuracy and expand the measurement range, the total coupling efficiency over the entire measurement range at different working distances of fiber probe was evaluated by Zemax analysis tool and theoretical model. The performance of the system was verified by experiments. The experimental results show that the measurement accuracy of axial clearance is better than 10.5 um within the range of 0.5–20.5 mm. The measurement accuracy has been effectively improved compared to previous methods. Additionally, the probe size is reduced to a mere diameter of 2.78 mm, which is more suitable for axial clearance measurement in narrow spaces inside rotating machines.

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Axial clearance measurement method based on wavelength division multiplexing with all-fiber microwave photonic mixing

Yu,

Duan,

et al. 2024

Opt. Express

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Rotor-stator axial clearance plays a pivotal role in ensuring the safety and efficiency of major rotating machinery. This paper introduces an innovative clearance measurement method based on wavelength division multiplexing (WDM) combined with all-fiber microwave photonic mixing. The method is distinguished by large measurement range, high accuracy and low drift. The WDM-based common optical path structure is established. A comprehensive theoretical model of axial clearance drift determined by wavelength and temperature is developed based on the thermo-optic effect of optical fiber material. To efficiently separate measurement and reference light at the probe, the optical design for a compact optical bandpass filter (OBPF) fiber sensor probe is proposed. The performance of the method is substantiated by simulations and experiments. The results demonstrate an accuracy of better than 2.8µm over a 23.5 mm range, surpassing existing methods. The method's capability to mitigate temperature-induced drift is further confirmed through high-temperature drift and comparative experiments.

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Reconfigurable microwave photonic mixer for hybrid macro-micro cellular systems

Cited by 3 publications

References 36 publications

Broadband Microwave Photonic Mixer With High Spurs Suppression and Image Rejection

Broadband Microwave Photonic Mixer With High Spurs Suppression and Image Rejection

High-accuracy measurement system for rotor-stator axial clearance in narrow spaces based on all-fiber microwave photonic mixing

Axial clearance measurement method based on wavelength division multiplexing with all-fiber microwave photonic mixing

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