| 主权项 |
1. A system, comprising:
(a) a double-clad (DC) multicore (MC) Erbium-doped fiber (EDF), comprising:
(a1) cores arranged in a hexagonal configuration, the hexagonal configuration having a core pitch, each core comprising Erbium dopant, each core further comprising Aluminum dopant, each core having a core diameter, the core diameter being between about 10 microns and about 15 microns, each core comprising a gain-dopant, each core having a first numerical aperture:(a2) an inner cladding surrounding the cores, the inner cladding having an inner-cladding diameter, the inner-cladding diameter being between about 80 microns and about 110 microns, the inner cladding having a second numerical aperture, the first numerical aperture being between about 0.08 and about 0.17 relative to the inner cladding; and(a3) an outer cladding surrounding the inner cladding, the outer cladding comprising a soft polymer, the outer cladding having an outer-cladding diameter that is greater than the inner-cladding diameter, the second numerical aperture being between about 0.22 and about 0.65 relative to the outer cladding; (b) a MC tapered signal-pump fiber combiner (TFC) optically coupled to the DC-MC-EDF, the MC-TFC comprising:
(b1) a multicore fiber (MCF) extending from an un-tapered end of the MC- TFC, the MCF comprising pedestal fibers; and(b2) a MC tapered end that is core-match-spliced to the DC-MC-EDF;(b3) multimode fibers (MMF) surrounding the MCF, the MCF and MMF being bounded together and fused and tapered down; and (c) a pump optically coupled to the MC-TFC. |
