Reconfigurable multi-band transceiver with RF self-interference cancellation and image rejection based on OFC

Area of Science:

• Photonics
• Optical Communications
• Signal Processing

Background:

• Full-duplex communication faces challenges with self-interference (SI).
• Image signal (IM) suppression is crucial in transceiver design.
• Multi-band operation requires flexible frequency conversion.

Purpose of the Study:

• To propose a photonic-assisted transceiver with integrated self-interference cancellation (SIC) and image rejection (IR).
• To enable multi-band frequency conversion from C-band to Ka-band.
• To demonstrate tunable operation without reliance on optical filters.

Main Methods:

• Utilizing a dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM) for SI cancellation.
• Employing a 90° optical hybrid for IM suppression via phase cancellation.
• Using an optical frequency comb (OFC) as a multi-frequency local oscillator and a wavelength-selective switch for flexible comb tooth selection.

Main Results:

• Effective suppression of both SI and IM demonstrated through theoretical analysis and simulation.
• Achieved SIC depth exceeding 40.2 dB and image rejection ratio (IRR) over 38.4 dB for a 0.5 GHz bandwidth 4-QAM signal.
• Error vector magnitude (EVM) reduced to below 3.5%, indicating high signal recovery quality.

Conclusions:

• The proposed photonic transceiver effectively cancels self-interference and rejects image signals.
• The system offers strong tunability for multi-band frequency conversion and RF signal recovery.
• The demonstrated performance highlights the potential for advanced wireless communication systems.