Polarization maintaining multiple-depth en face optical coherence tomography system using active re-circulation loops...

Area of Science:

• Biomedical Optics
• Optical Imaging
• Medical Technology

Background:

• Multi-path optical coherence tomography (OCT) enables simultaneous imaging at multiple depths and channels using re-circulating loops.
• Existing OCT configurations suffer from significant signal attenuation between successive channels, limiting imaging depth and quality.
• Reported signal decay in previous systems was typically 4 dB per channel.

Purpose of the Study:

• To develop and present an improved technique for multi-path OCT to minimize signal loss.
• To enhance the signal strength and consistency across multiple imaging channels.
• To overcome the limitations of previous OCT configurations regarding signal decay.

Main Methods:

• Implementation of polarization-maintaining fiber in the OCT system.
• Modulation of the drive current for semiconductor optical amplifiers in each arm.
• Utilizing re-circulating loops for multi-depth and multi-channel image acquisition.

Main Results:

• Achieved a significant reduction in signal decay between channels.
• Signal decay was reduced to less than 20 dB from the 1st to the 10th channel.
• Demonstrated improved signal integrity for deeper imaging applications.

Conclusions:

• The presented technique effectively mitigates signal attenuation in multi-path OCT.
• This advancement allows for more robust and deeper imaging with improved signal quality.
• The optimized OCT system offers enhanced capabilities for various biomedical imaging applications.