Importance

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Abstract

A fiber collimator includes a holder having a spacer provided therein, an aspherical lens, and a fiber pigtail. The spacer has a design thickness taking a machining tolerance thereof into consideration to be equal to or larger than an effective focal length of the aspherical lens, with a difference thereof no more than 30 .mu.m. The fiber pigtail and the aspherical lens are separately inserted into two ends of the holder to abut against and fix to two end surfaces of the spacer. Since the spacer has a thickness varies with changes in its machining tolerance, a focus-out distance .DELTA.d of the fiber tip always randomly falls in a fixed range, for example, from 30 .mu.m.gtoreq..DELTA.d.gtoreq.0, and the finished fiber collimator always has an optimal working distance within an enlarged range from 0 to 140 mm. A method for manufacturing the fiber collimator is also described.

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First Claim