Abstract
An ultrawideband photonic radio-frequency (RF) self-interference cancellation (SIC) for in-band full-duplex (IBFD) radio-over-fiber (RoF) transmission is proposed. Thanks to the fiber dispersion induced tunable RF time delay and amplitude response control of optical carrier phase-shifted double sideband (CPS-DSB) modulation, high precision of time and amplitude tuning of RF signals over broad band in the optical domain can be achieved, enabling excellent SIC and signal of interest (SOI) recovery after long distance fiber transmission. Meanwhile, the dispersion induced SOI power fading is compensated by adjusting the optical carrier phase of the CPS-DSB signal. For 25 km fiber transmission, 20 dB cancellation depth over 9 GHz, 160 Mbit/s 16-quadrature amplitude modulation (16-QAM) SOI recovery, and good immunity to fiber dispersion are experimentally verified.
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