Experimental investigation of supercontinuum generated from microfiber loop wound on Al-coated silica rod

The microfiber loop supported by Al-coated silica rod is assembled. The critical coupling condition with a maximum extinction of 23.26 dB in the loop is achieved by tuning the coupling coefficient. The supercontinuum generation from single-mode fiber, optical microfiber and microfiber loop is investigated experimentally. Compared with single-mode fiber, spectrum broadening of optical fiber microwire is larger. We also demonstrate that the flatness of supercontinuum generated from the microfiber loop can be controlled by shifting the cross angle between two ports of the microfiber loop wrapped around silica rod. The properties of microfiber loop may provide opportunities for new application of supercontinuum.