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Brillouin-based optical carrier amplification for Kramers-Kronig receivers with DC value method
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DOI：10.1007/s11082-026-09074-x.png)
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Abstract
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This work experimentally demonstrates a self-coherent receiver integrating stimulated Brillouin scattering (SBS)-based carrier amplification with Kramers-Kronig (KK) detection and upsampling-free DC-value (DCV) digital signal processing. A comprehensive simulation study is performed, and the optimum carrier-to-signal power ratio (CSPR) is independently identified for both conventional and receiver-side carrier-amplified configurations. The results show that, when each configuration is operated at its respective optimum CSPR, receiver-side carrier amplification can provide improved BER and EVM performance within the considered system framework. Experimental validation is carried out using a 10-GBaud 16-QAM signal transmitted over a 50-km optical fiber, which serves as both the transmission medium and the SBS gain medium, avoiding the need for additional optical amplification. The DCV approach further reduces the requirement for high-rate digital upsampling while maintaining performance comparable to the conventional KK method, as confirmed through BER and EVM measurements. The proposed SBS-DCV approach highlights a practical trade-off between carrier allocation and DSP complexity and is potentially attractive for short-reach, high-speed optical links such as data center interconnects.
Keywords:
Optical communication
Kramers-Kronig (KK) receivers
Stimulated Brillouin scattering (SBS)
Self-coherent receivers
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