Fig. 1. (a) Schematic of the signal combiner fabricated by capillary method; (b) cross section of the signal combiner at the splice point.

Fig. 2. Laser field of the combiner at the following: (a) initial location; (b) final end face of the tapered bundle; (c) output laser field of the combiner; (d) far field of the output laser from the combiner.

Fig. 3. Cross sections: (a) original bundle; (b) arbitrary location in the transition region; and (c) final end-face of the tapered bundle.

Fig. 4. Transmission efficiencies of each port of the combiner.

Fig. 5. M2 measurement of the combiner by launching seven fiber lasers at 1064 nm each with 2 W of output power into the seven input ports of the combiner.