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Modern fiber-optic coherent communications employ advancedspectrally-efficient modulation formats that require sophisticated narrowlinewidth local oscillators (LOs) and complex digital signal processing (DSP).Here, we establish a novel approach to carrier recovery harnessing large-gainstimulated Brillouin scattering (SBS) on a photonic chip for up to 116.82Gbit/sec self-coherent optical signals, eliminating the need for a separate LO.In contrast to SBS processing on-fiber, our solution provides phase andpolarization stability while the narrow SBS linewidth allows for arecord-breaking small guardband of ~265 MHz, resulting in higherspectral-efficiency than benchmark self-coherent schemes. This approach revealscomparable performance to state-of-the-art coherent optical receivers withoutrequiring advanced DSP. Our demonstration develops a low-noise andfrequency-preserving filter that synchronously regenerates a low-powernarrowband optical tone that could relax the requirements on very-high-ordermodulation signaling and be useful in long-baseline interferometry forprecision optical timing or reconstructing a reference tone for quantum-statemeasurements.

Chip-based Brillouin processing for carrier recovery in coherent optical communications