研究目的
To propose and demonstrate a novel Mach-Zehnder interferometer using eccentric-core fiber design for optical coherence tomography to enable high-precision adjustment of optical path difference without power supply, simplifying the system structure.
研究成果
The proposed ECF-based MZI for OCT successfully adjusts OPD with high precision using mechanical bending, eliminating the need for power supply. It improves fringe contrast and system simplicity, demonstrating feasibility with experimental measurements on glass slides. Future work could enhance the range by increasing bending length or core offset distance.
研究不足
The sensitivity is limited by unstable phase noise of the custom-made swept source and unbalanced detection. The attainable OPD adjustment range is in the order of tens of micrometers, which may be insufficient for large imaging depth ranges without modifications. The system requires precise mechanical bending, which could introduce alignment errors.
1：Experimental Design and Method Selection:
The study uses an all-fiber Mach-Zehnder interferometer with an eccentric-core fiber (ECF) as one arm to adjust optical path difference (OPD) through mechanical bending. Theoretical models include equations for bending-induced length variation and birefringence calculation.
2：Sample Selection and Data Sources:
Samples include a mirror for analyzing bending responses and four pieces of overlapping glass slides for tomography. Data is acquired from interferometric signals.
3：List of Experimental Equipment and Materials:
Includes a custom-made swept source laser, ECF, SMF, circulators, couplers, photodetector, digitizer, fusion splicer, optical power meter, light source, micrometer screw, fiber holders, metal sheet, and clamps.
4：Experimental Procedures and Operational Workflow:
The ECF is bent using a mechanical setup with a micrometer to apply curvature; interference signals are measured and analyzed. Fusion splicing aligns ECF with SMF. Birefringence is measured using a Sagnac loop.
5：Data Analysis Methods:
Interference spectra are analyzed for fringe contrast; Fourier transform is used for depth profiling; birefringence is derived from wavelength deviations.
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SOA
IPSAD1304
InPhenix, Inc.
Used as gain medium in the swept source laser to generate broadband optical signal.
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FFP-TF filter
FFP-TF
Micron Optics, Inc.
Used for filtering processing in the swept source laser.
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FPGA
XC6SL8
Part of the function signal generator to control the digital synthesizer.
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Digital Synthesizer
AD9834
Produces sinusoidal signal to drive the FFP-TF filter.
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Photodetector
PD-30
Optilab, Inc.
Detects interferometric signal; linear InGaAs PIN type with 30 GHz bandwidth.
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Digitizer
U5303A
Acqiris, Inc.
Digitizes the detected signal with 12-bit resolution.
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Fusion Splicer
FSM-80S
Used to splice ECF to SMF through core alignment.
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