All-fiber spot-size transformer for efficient free-space optical interconnecting devices

Kim, Kyung Rok; Oh, Kyunghwan

doi:10.1364/ao.42.006261

Cited by 8 publications

(1 citation statement)

References 15 publications

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“…The abrupt change of the fiber core could be softened in those ways. A similar effect can be obtained by using a tapered fiber or thermally expanded core fiber [5,7]. Using a BF is attractive in terms of fabrication ease.…”

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confidence: 90%

Lens-free endoscopy probe for optical coherence tomography

et al. 2013

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We present an ultrathin fiber-optic endoscopy probe for optical coherence tomography (OCT), which is made of a series of fused optical fibers instead of the conventional scheme based on an objective lens. The large-core fiber with a core diameter of 20 µm was utilized for the probe, while a single-mode fiber of core diameter 8.2 µm mainly delivered the OCT light. Those fibers were spliced with a bridge fiber of an intermediate core size. The guided light was stepwise converted to a beam of a large mode-field diameter to be radiated with a larger depth of focus. We obtained a 125 µm thick all-fiber endoscopy probe with a side-viewing capability implemented by an angled fiber end. Successful OCT imaging was demonstrated with a swept-source OCT system and showed the practical applicability of our lens-free endoscopy probe.

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confidence: 90%

Lens-free endoscopy probe for optical coherence tomography

et al. 2013

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Analysis of fiber lens with gradient index based on thin lens equivalence

Zhang

2006

Optoelectr. Lett.

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Theoretical analysis of the fiber-lens TEC (Thermally Expended Core) /Coreless/GRIN (Graded-Index) based on thin lens equivalence is presented in this paper. On condition that the TEC part adjusts the waist radius of an incident Gaussian beam,that the coreless part controlls the space between the beam waist and the thin lens,and that the GRIN part acts as the thin lens with its focal length determined by fiber index distribution parameter g, the analytic expressions of the waist spot size and the working distance of the output Gaussian beam are derived,and the influence of the coreless fiber and the length of the GRIN fiber upon the fiber-lens parameter is discussed based on the numerical simulation results. It is concluded that, if a GRIN style fiber-lens is used as a collimator,the maximum of the spot waist can be up to 80 pm and the divergence angle of single-mode optical fiber can be reduced by 8 times. If it is applied to a MEMS device, the maximum working distance can be up to 3 mm.

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