Photonic integrated circuit design for the dual band swept-source OCT

Abstract

Modern optical coherence tomography (OCT) systems are commonly designed for simultaneous operation at one transparency window. The wavelength range defines the kind of tissue being scanned and the pathology type the OCT system can detect. The combination of the two wavelength ranges allows the locating of different anomalies at an early stage. For now, this combination is possible by using two separate OCT systems. That makes this approach expensive and time-consuming as there is a need to rescan tissue by the second OCT system. To overcome this problem, we propose a photonic integrated circuit (PIC) design for simultaneously scanning one tissue point with two different wavelength ranges. The proposed PIC is designed for the swept-source OCT method because it provides maximum scanning speed with high resolution. The PIC contains an interferometer, reference arm, and optical clock for two transparency windows on a single chip. We developed a band-pass filter that distributes wavelengths between two interference schemes to provide simultaneous scanning. Numerical simulations with Ansys Lumerical show that reflected from the tissue sample beams in the first and the second transparency windows do not affect each other’s detection schemes.

Speaker

Ivan Stepanov
Ufa University of Science and Technology
Russia

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