We report development of 85µm core Yb-doped and Ge-doped chirally-coupled-core (CCC) fibers, and their integration via fusion-splicing into an all-fiber optical amplifier system. This system, consisting of a CCC fiber amplifier and a 6+1 fusion-spliced signal-pump-combiner with a passive CCC fiber feed-through produces robust single mode output (diffraction-limited) in a counter-pumped configuration with passive-fiber leads as short as ~30cm. The Yb-doped 85µm core CCC fiber amplifiers had produced ~10mJ energy pulses at close to ~100W of average power. This achieved performance and monolithic all-fiber integration are required for compact and robust coherently-combined laser array drivers of laser plasma accelerators.
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