OPTICAL-FIBER-BUNDLE STRUCTURE, RARE-EARTH-DOPED MULTI-CORE FIBER, CONNECTION STRUCTURE THEREFOR, METHOD FOR EXCITING RARE-EARTH-DOPED MULTI-CORE FIBERS, AND MULTI-CORE-OPTICAL-FIBER AMPLIFIER

摘要

A bundle structure is obtained by arranging optical fibers having equal diameters in a close-packed arrangement around the outer circumference of a center optical fiber. The optical fibers are signal light optical fibers that transmit signal lights. The optical fiber is a pump light optical fiber that transmits pump light. The number of optical fibers is equal to the number of cores in the multi-core fiber. The bundle structure and the multi-core fiber are connected to one another by adhering or fusing. The cores and the cores are optically connected, and the core and the cladding are optically connected. When connecting, the mode field diameter of the cores and the cores are substantially equivalent. In addition, the outer diameter (diameter of circumscribed circle including optical fibers) of the bundle structure is set so as not to be greater than the outer diameter of the multi-core fiber.

主权项

1. An optical-fiber-bundle structure that can introduce pump light into a rare-earth-doped multi-core fiber, comprising
a pump light optical fiber that transmits pump light, which is arranged at the center on the cross section thereof; and signal light optical fibers that transmit signal lights, which are arranged close-packed on the outer circumference of the pump light optical fiber that transmits pump light, wherein the diameter of the pump light optical fiber is greater than the diameter of the signal light optical fiber t.