Abstract
Reliable, rugged and optically efficient fiber combiners are required for monolithic single frequency amplifier systems [1]. The most common fiber combiner type, a tapered fused fiber bundle (TFB), combines highly efficiently pump light up to several hundred watts, but with the drawback of an interrupted signal core, since this approach is based on the fiber end face pumping scheme [2]. Hence, the beam quality and the signal transmission can be influenced using the counter-propagation pumping (CPP) scheme. We developed an all-fiber side-pumping approach based on a coreless tapered intermediate fiber (see. Fig. 1) [3]. The signal feedthrough of this combiner offers the possibility to pass a high power signal in forward and, particularly, in reverse direction. Moreover, several pump feeding fibers can be laterally fused around a passive or active double-clad fiber (target fiber) with pump combining efficiencies of about 90 %. We will present details and further progress of the optical fiber combiner design with the focus on the impact of the fiber combiner on the single-frequency amplifier performance in the case of CPP.
© 2013 IEEE
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