High-Speed Multi-Channel Signal Acquisition in Photonic Time Stretch Optical Coherence Tomography Through Frequency Division Multiplexing

Photonic time stretch optical coherence tomography (OCT) has achieved unprecedented A-scan rates of tens of MHz in previous studies. However, the slower lateral scan rate remains a bottleneck for volume imaging speed. In this work, we propose and demonstrate a novel data acquisition method that enables simultaneous ultrafast multi-channel Ascans in photonic time stretch OCT. Utilizing frequency-division multiplexing, our approach maintains the high A-scan rate and the same axial resolution, while significantly improving the overall imaging throughput. This advancement addresses the existing limitations and represents a significant step forward in high-speed and high-throughput OCT imaging.