New method of producing a uniformly over-filling launch distribution for multimode bandwidth measurements

Walter M. Burchanowski

doi:10.1117/12.135398

1 February 1992 New method of producing a uniformly over-filling launch distribution for multimode bandwidth measurements

Walter M. Burchanowski

Author Affiliations +

Proceedings Volume 1580, Fiber Optic Components and Reliability; (1992) https://doi.org/10.1117/12.135398
Event: OE Fiber, 1991, Boston, MA, United States

Abstract

A new method of pigtailing lasers produces an over-filled launch for bandwidth measurements without the use of a conventional mode-scrambler. Improvements are made over a conventional mode-scrambler system in both power coupled to the launch and improved reliability of the launched distribution. This technique utilizes a large-core/high-numerical aperture step-index multimode fiber to act on the high divergence angle of a laser diode. Within a few meters of the laser, mode power is uniformly distributed over more than 95% of the core diameter and fills 90% of the numerical aperture. This distribution then is transported, unchanged, to the fiber under test at the bandwidth launch. The fiber can be selected such that it efficiently over-fills the fiber under test, while not wasting power by launching into the cladding.

Citation Download Citation

Walter M. Burchanowski "New method of producing a uniformly over-filling launch distribution for multimode bandwidth measurements", Proc. SPIE 1580, Fiber Optic Components and Reliability, (1 February 1992); https://doi.org/10.1117/12.135398

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