Date

5-1-2018

Document Type

Thesis

Degree

Master of Science

Department

Electrical and Computer Engineering

First Adviser

Zhou, Chao

Abstract

OCT has been taking an important role in medical imaging. Firstly used as a time domain model, it’s somewhat limited by its speed. However, speed is significantly improved after the introduction of Fourier Domain OCT. Since this imaging method is commonly used in ophthalmology, it requires higher speed to reduce motion artifacts. It’s also known that higher sensitivity is a favorable factor in OCT too. Resolution also takes an unnegligible role here. With better resolution we can delve into tissues with more clear images, which leaves us more information available for analysis. With all that being said, it’s not hard to imagine how many efforts have been put into it to achieve higher speed, sensitivity and resolution. We, as a part of this field, are also striving to achieve this goal. By using integrated photonic chip which has a three layer cascade of 1X2 splitters to split incident light into 8 beams we can not only reduce the complexity of the structure of fiber optics in its prototype but also lower the cost. From [5,6] we know that the speed is proportional to the number of beams, and an imaging speed of 800, 000 A-scans/s was achieved with a sensitivity of 91 dB. In this paper an improved version of Space Division Multiplexing OCT system based on the previous systems was demonstrated with an increase of sensitivity by 6dB, from 91 dB to 97dB.

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