Flexible Curled Optical Cord for Bending-Insensitive optical imaging delivery
- Flexible Curled Optical Cord for Bending-Insensitive optical imaging delivery
- 박재석; 정명영; 정창현; 오치환; 강희전; 한영근; 이상배; 김창석
- Biomedical optical imaging; optical coherence tomography (OCT); optical fiber fabrication
- Issue Date
- IEEE journal on selected topics in quantum electronics
- VOL 16, NO 4, 1031-1038
- Abstract—In the application of optical imaging technologies to
the biomedical field, the flexible optical cord is one of the key components
used to deliver the reflected optical signal fromthe internal
biological tissue to the biomedical imaging system. However, the
conventional optical fibers suffer from a critical wiring limitation,
which results in severe power losses under a small bending radius
that is less than a few centimeters. In this paper, we demonstrate
that holey optical fibers with 18 air holes in cladding have negligible
bending loss under a minimum bending radius of 3 mm.
Excellent bending insensitivity of the holey fibers can effectively
reduce the device size and space, which will be highly beneficial
to the flexible endoscopic common-path optical coherence tomography
system. A curled optical cord, similar to a curled telephone
cord, is specially designed and fabricated to accommodate access
of the imaging probe to the biological target at flexible distances.
The curled optical cord displays excellent optical properties of a
much lower bending loss and better optical imaging quality, but
the attenuation and insertion losses are still the same as that of a
conventional single-mode fiber-based optical cord.
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