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

Nai Zhang; Xin Huo

doi:10.1117/12.806299

9 February 2009 A novel lensed fiber for side-coupling of a single-mode fiber

Nai Zhang, Xin Huo

Proceedings Volume 7158, 2008 International Conference on Optical Instruments and Technology: Microelectronic and Optoelectronic Devices and Integration; 71580E (2009) https://doi.org/10.1117/12.806299
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

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.

Citation Download Citation

Nai Zhang and Xin Huo "A novel lensed fiber for side-coupling of a single-mode fiber", Proc. SPIE 7158, 2008 International Conference on Optical Instruments and Technology: Microelectronic and Optoelectronic Devices and Integration, 71580E (9 February 2009); https://doi.org/10.1117/12.806299

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KEYWORDS

Optical fibers

Surface finishing

Optical simulations

Optical matrix switches

Polishing

Single mode fibers

Reflectivity

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