M. Uebernickel, B. Eppich, K. Paschke, G. Erbert, and G. Tränkle

Published in:

IEEE Photonics Technol. Lett., vol. 24, no. 14, pp. 1248-1250 (2012).

Abstract:

In this letter, we demonstrate how the coupling efficiency of a tapered diode laser (TPL) into a single-mode fiber under specified conditions can be predicted from measured Wigner distribution functions (WDFs). The WDFs were measured with a simple setup similar to the method of measuring the beam propagation ratio M² as specified in the ISO standard 11146. We used the measured WDFs to predict the coupling efficiencies of the beam into a single-mode fiber by using a predefined and well-known optical system. We then realized the fiber coupling and compared the measured coupling efficiencies to the predicted values. For this comparison we used the beam of a distributed Bragg reflector TPL which emits a fairly complex and structured beam. The predictions fitted the experimental result with relative deviations below 10%.

Index Terms:

Fiber coupling, tapered diode laser (TPL), Wigner distribution function (WDF).

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