Abstract

Optical multipath RF self-interference cancellation (SIC) based on phase modulation for full-duplex communication is proposed and demonstrated experimentally. Phase modulation is utilized to convert the RF signal into optical domain, in which the time delay tuning, amplitude tuning and phase inversion for multipath RF SIC are completed. The comprehensive theoretical model of the optical multipath RF SIC system is established, and the factors affecting SIC performance including the time delay, amplitude and phase deviations are analyzed. The experimental results verify the feasibility of the proposed scheme for full-duplex communication with the cancellation depth of 26 dB and 28 dB over 100 MHz at central frequency of 6 GHz and 10 GHz, respectively. A figure of merit of the maximum interference to signal of interest ratio is defined to characterize the SOI recovery capability of optical RF SIC system.

Highlights

  • Compared with time division duplex (TDD) and frequency division duplex (FDD), full-duplex can realize simultaneous transmitting and receiving signals at the same frequency band, which significantly increases spectrum utilization and doubles data rate

  • The amplitude and time matching of the reference signal is realized by the variable optical attenuator (VOA) and the tunable optical delay line (TODL)

  • We present a multipath RF self-interference cancellation (SIC) scheme by utilizing an optical spectrum shaping technique, where the amplitude tuning and sideband filtering are realized completely by only one optical engine based on diffraction grating and solid-state liquid crystal on silicon (LCoS)

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Summary

Introduction

Compared with time division duplex (TDD) and frequency division duplex (FDD), full-duplex can realize simultaneous transmitting and receiving signals at the same frequency band, which significantly increases spectrum utilization and doubles data rate. Phase-reversion can be achieved by a Balun as the RF power splitter at the input port [14] or a balanced photo detector as the RF power combiner at the output end [15]–[17] In these schemes, the amplitude and time matching of the reference signal is realized by the variable optical attenuator (VOA) and the tunable optical delay line (TODL). By virtue of the inherent out-of-phase relationship between the two sidebands of the phasemodulated signal, we proposed an optical RF SIC method based on phase modulation and optical sideband filtering for full-duplex application [27] It has the advantages of simple and stable system structure with no need of bias point control. SOI ratio is defined for the first time as far as we know to characterize the capability of optical RF SIC system for full-duplex communication

Operation Principle and Performance Analysis
Operation Principle
Cancellation Performance Analysis
The Time Delay Deviation
The Amplitude Deviation
The Phase Deviation
Multipath Cancellation Experiment and Results
Multipath Spectrum Processing
RF Self-Interference Cancellation
SOI Recovery Performance
Maximum Interference to SOI Ratio
Conclusion

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