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Lensed fibers are used to couple light between optical fibers and lasers, semiconductor optical amplifiers, waveguides, and other devices. Lensing technology enables highly effective coupling within a small space; an advantage not offered by bulk optic alternatives. In recent years, substantial changes have occurred in lensed fiber technology to increase flexibility and extend optical performance. Two significant developments–the advancement of fiber polishing technologies and the development of novel lens designs–stand out.
Advances in polishing …
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 conical/wedge shaped fiber endface. These 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. Using this new method, the coupling efficiency exceeds 80%.