Dr. Xin Huo Profile

Dr. Xin Huo

at Dalian Actech Inc

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Proceedings Article | 9 February 2009 Paper

A novel lensed fiber for side-coupling of a single-mode fiber

Nai Zhang, Xin Huo

Proceedings Volume 7158, 71580E (2009) https://doi.org/10.1117/12.806299

KEYWORDS: Optical fibers, Surface finishing, Optical simulations, Optical matrix switches, Polishing, Single mode fibers, Reflectivity, Beam analyzers, Structured optical fibers, Photodetectors

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A novel lensed fiber for side-coupling of a single-mode(SM) optical fiber and the corresponding fabrication method were proposed, which makes the coupling assembly more compact and easy to integrate and package. The novel lensed fiber mainly composes of a portion of SM optical fiber and a portion of coreless optical fiber. The two fibers are jointed by fusing splicing. The end of the coreless fiber is shaped to have a 45 degree angled end face and polished to form a contoured curved surface. Then the contoured surface is coated so it acts as a curved reflective surface. Besides, the cylindrical surface of the coreless fiber acts as a second curved surface. The two curved surfaces compose a pair of equivalent cylindrical lens. After being focused by the equivalent cylindrical lens pair, the output spot size is comparable to the mode field radius of the SM optical fiber. Matrix optics was used to analyze the output beam parameters of the proposed lensed fiber structure. Simulation results showed that the proposed lensed fiber can bend the beam with 90 degree and make a focused spot on its side with a small spot size close to 6µm, which is suitable for fiber to photodetector chip side-coupling applications.

Proceedings Article | 9 February 2009 Paper

A method to fabricate hemispherical micro-lens of optical fiber

Xin Huo, Shi Pan

Proceedings Volume 7158, 715804 (2009) https://doi.org/10.1117/12.807053

KEYWORDS: Etching, Optical fibers, Single mode fibers, Structured optical fibers, Optical fabrication, Fiber optics, Liquids, Cladding, Fiber lasers, Polishing

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According to the preparation of tapered fiber hemispherical micro-lens by hybrid etching and melting, a geometric calculation model for fabricating hemispherical micro-lens at the end of optical fiber by melting tapered flat fiber end into hemispherical fiber end has been developed. If the taper diameter and taper angle are obtainable, the radius of hemispherical micro-lens of the fiber taper after melting can be calculated. Particularly, hemi-spherical micro-lenses of optical fibers with various radii can be fabricated by etching-cleaving-melting method. According to the linear relationship between etching fiber diameter and etching time, as well as the characteristic of fiber volume maintaining constant before and after electric arc melting, the relationship between the radius of fiber hemispherical micro-lens and etching time was deduced in this paper. Through controlling the etching time precisely after calculating the etching rate, which is determined by the sampling and analysis of the etched fiber, the hemi-spherical micro-lenses with different radius at the fiber ends can be produced. The experiments were conduct to test the operability of this method. The results showed that radii of micro-lenses fabricated by the etching-cleaving-melting method made a good coincidence with the designed radius values of 10µm and 20µm.

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