Abstract
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 chromatic-dispersion 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.
Highlights
Radio-Over-Fiber (ROF) system based on in-band full-duplex (IBFD) technique has been widely investigated for its high spectral utilization
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)
Due to dual-parallel DDMZM is not available in our lab, we used the combination of a dual-polarization DDMZM and a polarizer to achieve the same function in our proof-of-concept experiment
Summary
Radio-Over-Fiber (ROF) system based on in-band full-duplex (IBFD) technique has been widely investigated for its high spectral utilization. The SIC of IBFD is implemented by duplicating the original transmitted signal as reference signal to cancel the self-interference signal. A RF canceller that utilizes photonic components and fiber Bragg gratings to create a wideband vector modulator architecture with tunable time-delay taps has been reported to realize SIC [7]. Most of the reported photonic-based SIC approaches were only focused on the elimination of self-interference signals themselves [3], [8]–[13]. To the best of our knowledge, the cancellation of self-interference signal, elimination of CDIP effect, and down-conversion of signal of interest (SOI) using harmonic local oscillation (LO) signal at the same time has never been reported. We propose a photonic scheme to simultaneously realize SIC, CDIP elimination, and harmonic down-conversion (HDC) using a dual-parallel DDMZM for IBFD system. The proposed approach is theoretically analyzed and verified by a proof-of-concept experiment
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