All-Optical and Broadband Microwave Image-Reject Receiver Based on Phase Modulation and I/Q Balanced Detection

Kang, Bochao; Li, X.; Fan, Yangyu; Shi, Fangjing; Shen, Linghao; Tan, Qinggui; Wang, Di; He, You; Gao, Yongsheng

doi:10.1109/jlt.2020.3007436

Cited by 17 publications

(5 citation statements)

References 35 publications

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“…Therefore, an EDFA is inserted before the PMC to compensate for the loss. The auto-control loop of power and phase with electric optical attenuator and electric polarization controller can be used to compensate the balance of I and Q channel, which can also improve the reliability and stability of the proposed image-reject down-converter [27]. The phase noises of the down-converted signals with image rejection are also evaluated.…”

Section: Resultsmentioning

confidence: 99%

“…Many image-rejection down-converters based on cascaded modulators and phase cancellation have been proposed by using Hartley structure [23][24][25][26][27][28][29]. A dual-parallel Mach-Zehnder modulator (DPMZM) and a MZM with individual transfer features are cascaded for two perpendicular polarized light waves [23].…”

Section: Comentioning

confidence: 99%

“…The subsequent digital processing is carried out to further optimize the phase and amplitude balances between the I and Q intermediate frequency (IF) signals, resulting in good image rejection. Image-rejection down-conversion has been realized by two reversed-series PMs in a Sagnac loop [27], in which the LO and RF modulations are distinguished based on the velocity mismatch of the PM at high frequency. In addition, the phase shift can be generated by bias voltage adjustment of the modulators.…”

Section: Comentioning

confidence: 99%

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Filter-Free Photonic Image-Rejection Down-Conversion for Distributed Antenna Applications

et al. 2021

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Photonics-assisted frequency conversion based on cascaded modulators is an effective way to satisfy the requirements of distributed antenna array applications. A filter-free photonic image-rejection down-converter with immunity to dispersion-induced power fading is proposed and demonstrated. The radio frequency (RF) signal from the distributed antenna unit is injected into a dual-drive Mach-Zehnder modulator (DDMZM) through an electrical 90° hybrid coupler (HC), and a single-sideband (SSB) signal is realized. It is then transmitted to the center office by an optical fiber link. At the center office, the modulated RF signal is injected into a dual-polarization dual-parallel MZM (DP-DPMZM) after a polarization controller (PC). Afterwards, an LO signal remodulates it through the Y-DPMZM, and carrier-suppressed SSB modulation is fulfilled via another electrical 90° HC. After the power splitting, quadrature I and Q IF signals can be obtained by a photonics-based continuously adjustable phase shifter. Through a combination of the I/Q IF signals with a low-frequency electrical 90° HC, a photonics image-rejection down-converter based on phase cancellation is realized. Moreover, no optical filter is required; thus, the image-rejection down-converter can work with a large bandwidth. The proposed filter-free photonic image-rejection down-converter is theoretically analyzed and experimentally verified.

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Section: Resultsmentioning

confidence: 99%

Section: Comentioning

confidence: 99%

Section: Comentioning

confidence: 99%

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Filter-Free Photonic Image-Rejection Down-Conversion for Distributed Antenna Applications

et al. 2021

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“…For antenna remoting applications, RF signal and LO modulation are performed in different locations. Until now, there are only few reports on microwave photonic based I/Q mixers with antenna remoting ability [13]- [20]. An I/Q mixer based on a transversal filter approach [13] requires two different-wavelength laser sources and a dispersive fibre.…”

Section: Introductionmentioning

confidence: 99%

“…A cascaded modulator based I/Q mixer also requires a high-frequency electrical coupler [16], [17] or a polarisation modulator, which is currently not commercially available [18]. An I/Q mixer implemented by two phase modulators inside a polarisation beam splitter (PBS) loop [20] can overcome the problems in the cascaded modulator structure while having the antenna remoting ability. However, it has a complex structure as it requires polarisation controls of two optical signals in front of two PBSs followed by two sets of balanced detectors.…”

Section: Introductionmentioning

confidence: 99%

All-Optical In-Phase/Quadrature Microwave Mixer for Antenna Remoting Applications

Chen

Chan

2021

IEEE Photonics J.

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A new microwave photonic signal processing structure for realising in-phase/quadrature (I/Q) mixing is presented. It is based on a dual-drive Mach Zehnder modulator (DDMZM) and an optical phase modulator inside a Sagnac loop interferometer. Two output IF signals with a quadrature phase difference are obtained by using two photodetectors to detect the upper and lower sidebands of the optical signal at the Sagnac loop output. A quadrature phase difference in the two IF signals is realised by biasing the DDMZM at the quadrature point. This has the advantage of very little quadrature phase errors as a standard modulator bias controller can accurately lock the DDMZM bias point. The optical phase modulator driven by an RF signal can be placed in a remote location for antenna remoting. Theoretical analysis and simulation show using the proposed I/Q mixer for image rejection can overcome the modulation index dependent image rejection ratio problem in the reported I/Q mixers based on a cascaded modulator structure. The Sagnac loop based I/Q mixer is experimentally verified with results show only ±1 quadrature phase error and more than 50 dB image rejection ratio over the operating frequency range of 6 to 20 GHz.

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Doppler frequency shift measurement and direction discrimination based on a bidirectional phase modulator and a Sagnac loop

Chen

Shang

et al. 2021

Optik

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All-Optical and Broadband Microwave Image-Reject Receiver Based on Phase Modulation and I/Q Balanced Detection

Cited by 17 publications

References 35 publications

Filter-Free Photonic Image-Rejection Down-Conversion for Distributed Antenna Applications

Filter-Free Photonic Image-Rejection Down-Conversion for Distributed Antenna Applications

All-Optical In-Phase/Quadrature Microwave Mixer for Antenna Remoting Applications

Doppler frequency shift measurement and direction discrimination based on a bidirectional phase modulator and a Sagnac loop

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