Broadband mode converters are essential devices for space-division and wavelength-division multiplexing systems.There are great challenges in the generation of higher-order modes above the third order with low loss an...Broadband mode converters are essential devices for space-division and wavelength-division multiplexing systems.There are great challenges in the generation of higher-order modes above the third order with low loss and high mode purity employing all-fiber devices.In this paper,an all-fiber LP_(41)mode converter is proposed and fabricated by tapering a nine-core single-mode fiber bundle.Experimental results indicate that this all-fiber LP_(41)mode converter is low-loss,high-purity,and ultrabroadband.The insertion loss is less than 0.4 dB.The purity of odd LP_(41)at 1310 nm is 95.09%,and the operating bandwidth exceeds 280 nm.展开更多
基金supported by the National Key Research and Development Program of China(No.2018YFB1801802)the National Natural Science Foundation of China(Nos.61835006 and 62375143)。
文摘Broadband mode converters are essential devices for space-division and wavelength-division multiplexing systems.There are great challenges in the generation of higher-order modes above the third order with low loss and high mode purity employing all-fiber devices.In this paper,an all-fiber LP_(41)mode converter is proposed and fabricated by tapering a nine-core single-mode fiber bundle.Experimental results indicate that this all-fiber LP_(41)mode converter is low-loss,high-purity,and ultrabroadband.The insertion loss is less than 0.4 dB.The purity of odd LP_(41)at 1310 nm is 95.09%,and the operating bandwidth exceeds 280 nm.
