| BMEG400C/591C
Numerical OCT Signal Processing
| BMEG400C/591C
Interference Signal
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| BMEG400C/591C
Interference Signal with DC – Fringe
| BMEG400C/591C
Interference Signal with DC – FFT
| BMEG400C/591C
Interference Signal with DC
| BMEG400C/591C
Gaussian Windowing – Fringe
| BMEG400C/591C
Gaussian Windowing – FFT
| BMEG400C/591C
Gaussian Windowed Interference Signal
| BMEG400C/591C
Spectrum Amplitude & Phase Extraction
| BMEG400C/591C
Spectrum Amplitude & Phase Extraction
| BMEG400C/591C
Optical Path-length Difference (OPD)
| BMEG400C/591C
Optical Path-length Difference (OPD)
| BMEG400C/591C
Optical Path-length Difference (OPD)
| BMEG400C/591C
Dispersion
Material dispersion 𝑘 𝜔 = 𝑛 𝜔 𝜔/𝑐 (𝜔 = 2𝜋𝜈; 𝜈, frequency) can be developed into various dispersion orders ! ! “+ !
𝑘=𝑘$ +𝑑𝑘- 𝑑𝜔 #
Taylor series of phase
𝜔−𝜔$ +1𝑑%𝑘1 𝜔−𝜔$ % +1𝑑&𝑘1 2𝑑𝜔% 6𝑑𝜔&
| BMEG400C/591C
2nd Order Dispersion
| BMEG400C/591C
2nd Order Dispersion – Fringe
| BMEG400C/591C
2nd Order Dispersion – FFT
| BMEG400C/591C
2nd Order Dispersion
| BMEG400C/591C
3rd Order Dispersion
| BMEG400C/591C
3rd Order Dispersion – Fringe
| BMEG400C/591C
3rd Order Dispersion – FFT
| BMEG400C/591C
3rd Order Dispersion
| BMEG400C/591C
Dispersion Effect along OPD
| BMEG400C/591C
Dispersion Summary
𝐼!”# 𝑘 =𝑆 𝑘 + DC+𝐴cos 2𝜋Δ𝑧𝑘 ≈𝑆 𝑘 +𝐴cos 𝜙 𝑘 =𝑆 𝑘 +𝐴cos 𝜙$%&’ 𝑘 +𝜙()*+&,- 𝑘 +𝜙.%*+&,- 𝑘 +⋯
| BMEG400C/591C
k-nonlinear Sampling – Fringe
| BMEG400C/591C
k-nonlinear Sampling – FFT
| BMEG400C/591C
k-nonlinear Sampling Effect
| BMEG400C/591C
k-nonlinear Sampling Effect along OPD
| BMEG400C/591C
Single Detection vs Dual Balanced Detection
Reference arm
Sample arm
Reference arm
Sample arm
Swept Source
+ Balanced Photo-
− Detector
Swept Source
Photo- Detector
Balanced Detection
| BMEG400C/591C
| BMEG400C/591C
Balanced Detection
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