Fabrication of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si9.gif" display="inline" id="mml9" overflow="scroll"><mml:mi mathvariant="normal">π</mml:mi></mml:math>phase-shifted fiber Bragg grating and its application in narrow linewidth 1.5<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si10.gif" display="inline" id="mml10" overflow="scroll"><mml:mi mathvariant="normal">μ</mml:mi></mml:math>m Er-doped fiber lasersJunjie Sun, Jinbao Chen, Meng Wang et al.|Optics Communications|2017Cited by 5