Radio-frequency self-interference cancellation using a dual-drive Mach–Zehnder modulator and a fiber Bragg grating

Weng, Beiyue; Chang, Mengxu; Chen, Yang

doi:10.1117/1.oe.57.8.083107

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…Delay adjustment can be achieved through the use of optical tunable delay lines (OTDL) [5,6], fibre Bragg gratings (FBG) [7,8], or dispersive elements (DE) [9], whereas amplitude adjustment can be implemented with optical variable attenuators (OVA) [10] or semiconductor optical amplifiers (SOA) [11]. The inversion of the SI and SR signals can be realised by an electric phase shifter (EPS) [12], a balanced detector (BPD) [13,14] and an RF Balun transformer [15]. In these methods, the phase inversion is implemented in the electrical domain, leading to a limited SIC cancellation depth and bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Scalable Photonic-Assisted Multipath Self-Interference Cancellation Based on Optical Frequency Comb

Liu,

Wang,

Zhang

et al. 2024

IEEE Photonics J.

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In order to increase the scalability and reduce the complexity of photonic multipath SIC systems, a photonic multipath self-interference cancellation (SIC) method based on optical frequency comb (OFC) is proposed. The OFC is generated by continuously frequency-shifting the seed laser in the re-circulating frequency shifter (RFS) loop. The reference signal is modulated to the multiple combs of the OFC via a Mach-Zehnder modulator (MZM), and the received signal is loaded into another MZM. These two MZMs work at opposite quadrature bias points to reverse the phase of the received signal and the reference signal. After splitting and filtering with a dense wavelength division multiplexer, the reference modulation signals are injected into a multipath amplitude-delay matched link, where the amplitude and delay time are accurately controlled by several sets of optical variable attenuators and tunable delay lines. Both the inversion and amplitude-delay matching of the reference signals are realised in the optical domain, contributing to a broad bandwidth and high operational frequency. Experimental results show that the cancellation depth is greater than 45.9 dB for single-frequency signals, and 23.9 dB for signals with a bandwidth of 100 MHz in a setup with three self-interference paths. The proposed method is characterized by easy scalability, good flexibility, and low cost, making it suitable for complex multipath SIC in in-band full-duplex wireless systems.

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Section: Introductionmentioning

confidence: 99%

Scalable Photonic-Assisted Multipath Self-Interference Cancellation Based on Optical Frequency Comb

Liu,

Wang,

Zhang

et al. 2024

IEEE Photonics J.

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“…Methods to implement SIC using two separate optical paths were reported [18][19][20][21], which lead to the system unstable and sensitive to environmental changes. The SIC process in one path is more likely to improve the stability of the system, such as using a combination of dual-drive Mach-Zehnder modulators (DDMZMs) with fiber Bragg gratings (FBGs) or polarization-dependent double-parallel Mach-Zehnder modulators [22,23], a single DDMZM [24]. In fact, these reported photonic-based SIC methods were only focused on eliminating the self-interfering signal themselves.…”

Section: Introductionmentioning

confidence: 99%

Optical domain controlled microwave signal processing technology

Zhu

Feng²,

Zhai³

et al. 2022

Semiconductor Lasers and Applications XII

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Microwave photonic systems process the electrical signal in optical domain so that the characteristics of the output optical signals include the transfer function of the signal processing link. In this paper, we review our recent works about a microwave photonic repeater, self-interference cancellation, and microwave signal coupling techniques. First, based on a photonic repeater consisting of a dual-polarized dual-parallel Mach-Zehnder modulator (DP-DPMZM) and a polarization controller (PC), four different down-conversion states can be performed. Two separate local oscillator signals (LO) also enable frequency down-conversion of microwave signals in different frequency bands. Secondly, a dual-parallel dual-drive Mach-Zehnder modulator (DP-DDMZM) and a low-frequency LO signal source are used to achieve self-interference cancellation and harmonic down-conversion (SIC+HDC) for an in-band full-duplex (IBFD) system. Finally, for the microwave photonic coupling technique, a photonic microwave hybrid splitter (PMHS) and a photonic microwave hybrid combiner (PMHC) are proposed, respectively. The PMHS and PMHC individually controls the amplitude and phase of the two signals by adjusting the direct current (DC) biases of modulators. Our proposed signal processing techniques are very promising for flexible microwave signal processing, radars, and wireless communications.

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“…Nevertheless, these approaches employed two separate optical paths which makes the system unstable and sensitive to environmental changes [8]- [11]. The SIC process in one path is more promising to improve the stability of the system, which has been reported based on a dual-drive Mach-Zehnder modulator (DDMZM) combined with a fiber bragg grating (FBG) or a polarization-dependent dualparallel Mach-Zehnder modulator (DPMZM) [12], [13]. A photonic system based on a single DDMZM has also been reported to realize SIC [3].…”

Section: Introductionmentioning

confidence: 99%

Photonic Radio Frequency Self-Interference Cancellation and Harmonic Down-Conversion for In-Band Full-Duplex Radio-Over-Fiber System

Zhu

et al. 2019

IEEE Photonics J.

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We report a photonic radio frequency (RF) self-interference cancellation (SIC) and harmonic down-conversion (HDC) scheme based on a dual-parallel dual-drive Mach-Zehnder modulator (DDMZM). The proposed scheme can eliminate the chromaticdispersion induced power fading (CDIP) effect and thus is very suitable for in-band full-duplex (IBFD) radio-over-fiber (ROF) system. The self-interference RF signal is directly cancelled in optical domain, which overcomes the electronics bottleneck limitation of electrical SIC. Moreover, the HDC allows us to use a cost-effective low frequency local oscillation (LO) source to down-convert a high-frequency RF signal into an intermediate frequency (IF) band. In addition, the harmonic odd-order single-sideband (SSB) down-conversion is naturally free from the CDIP effect. The proposed photonic SIC+HDC system is theoretically analyzed and experimentally verified.

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Radio-frequency self-interference cancellation using a dual-drive Mach–Zehnder modulator and a fiber Bragg grating

Cited by 6 publications

References 15 publications

Scalable Photonic-Assisted Multipath Self-Interference Cancellation Based on Optical Frequency Comb

Scalable Photonic-Assisted Multipath Self-Interference Cancellation Based on Optical Frequency Comb

Optical domain controlled microwave signal processing technology

Photonic Radio Frequency Self-Interference Cancellation and Harmonic Down-Conversion for In-Band Full-Duplex Radio-Over-Fiber System

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