| 摘要 |
An apparatus and method are disclosed for fabricating an expanded beam cylindrically terminated optical fiber taper (36-38) from a reduced diameter preform rod (15). The present invention comprises mounting the reduced diameter preform rod in a first moving arrangement (11, 13, 16, 18, 19, 23) and a second moving arrangement (12, 14, 17, 25-29) and uniformly heating the circumference of a predetermined portion at an intermediate point of the preform rod with a heating arrangement (81) to a predetermined temperature, and then uniformly pulling the preform rod while continuing to heat additional material of the preform rod to produce a pair of expanded beam cylindrically terminated optical fiber tapers (37) connected by a predetermined length cylindrical central section of standard optical fiber (38) having a uniform diameter less than that of the original preform rod. The cylindrical central section is then severed midway between the two expanded beam optical fiber tapers to form two separate expanded beam cylindrically terminated optical fiber tapers comprised of (1) a predetermined length cylindrical end section of uniform diameter (36) equal to that of the original preform rod; (2) a reduced diameter optical fiber end section (38) suitable for splicing onto an optical fiber of similar dimensions; and (3) a tapered section (37), connecting the cylindrical end section to the optical fiber end section, having a gradually decreasing diameter that will avoid mode conversion of a lightwave signal propagating therethrough. |
