Production manner of the duplex core optical fiber and the duplex core optical fiber, the duplex core fiber laser and the duplex core fiber amplifier

摘要

(57) Abstract This invention canning the laser core (24) and the pump core (22) which are laid out on the center of the pump core (22) and the pump core (22) regards the duplex core optical fiber which possesses with clad (26). The pump core (22) which almost possesses the orbicular cross section has one grinding part (28) at least outside. The grinding part (28) extends to the light ray propagation direction of the duplex core optical fiber, (20) at the same time occupies 1 - 49% tonnage of diameter of the pump core (22). Furthermore, this invention regards with the production manner of the duplex core optical fiber and the duplex core fiber laser and the duplex core fiber amplifier which possesses the duplex core optical fiber of this invention. The pump core (22) which almost possesses the orbicular possesses the laser core (24) on the center cross section makes with simple join and the simple incidence of the pumping light ray for the other fiber optical part possible.