Research Papers

Fabricating Lensed Fiber Using a Novel Polishing Method

[+] Author and Article Information
Yih-Tun Tseng

Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, 70 Lianhai Road, Kaohsiung, Taiwan 80424, R.O.C.tsengyt@mail.nsysu.edu.tw

Jhong-Bin Huang, Wei-Jyun Su

Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, 70 Lianhai Road, Kaohsiung, Taiwan 80424, R.O.C.

J. Manuf. Sci. Eng 131(4), 041016 (Jul 15, 2009) (6 pages) doi:10.1115/1.3168441 History: Received April 08, 2007; Revised August 06, 2008; Published July 15, 2009

In optical communication systems, 980 nm high-power laser modules are applied for long-distance communication amplifiers. Since the mode field of the 980 nm laser diodes is different from single-mode fibers, coupling losses may occur. In order to improve this problem, lensed fibers have been used widely recently, such as lensed fiber employing quadrangular-pyramid-shaped fiber endface (QPSFE). The QPSFE can easily yield any elliptical microlens aspect ratio to match the far field of the high-power laser diode but the fiber endface must be polished and then spliced during present manufacturing process. It is a time-consuming task and the melting depth of the fiber endface is controlled with difficulty. This study develops a novel fiber endface polishing method for manufacturing the lensed fiber employing QPSFE. Using this new method, the coupling efficiency exceeds 70%.

Copyright © 2009 by American Society of Mechanical Engineers
Topics: Fibers , Polishing
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Figure 8

The simulations for shape of fiber tip

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Figure 9

The data of curvature in fixed 2 min

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Figure 10

The structure of polishing system

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Figure 11

The curvature for (a) point 1, (b) point 2, (c) point 3, (d) point 4, (e) point 5, (f) point 6, (g) point 7, (h) point 8, (i) point 9, (j) point 10, (k) point 11, and (l) point 12

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Figure 12

The polishing results for (a) points 1–6 and (b) points 7–12 at 2 min

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Figure 13

The polishing results for (a) point 6 and (b) point 7

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Figure 1

QPSFE manufacturing process

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Figure 2

The scheme of Simple Winkler elastic foundation

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Figure 3

The scheme of advanced polishing

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Figure 4

The results of the fiber is (a) not polished vertically and (b) polished vertically

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Figure 5

The lateral view of fiber

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Figure 6

Coupling efficiency as a function of R1x for 5.7-μm SMFs

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Figure 7

Coupling efficiency as a function of R1y for 5.7-μm SMFs




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