Generation and evolution of multiple operation states in passively mode-locked thulium-doped fiber laser by using a graphene-covered-microfiber<xref rid="cpb_27_8_084215_fn1" ref-type="fn">*</xref><fn id="cpb_27_8_084215_fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11304409 and 61705028), the Natural Science Foundation of Chongqing City, China (Grant Nos. csct2013jcyjA4004 and cstc2017jcyjA0893), the Scientific and Technological Research Program of Chongqing Municipal Education Commission, China (Grant No. KJ1500422), and the Postgraduate Research Innovation Foundation of Chongqing City, China (Grant No. CYS17240).</p></fn>

Generation and evolution of multiple operation states in passively mode-locked thulium-doped fiber laser by using a graphene-covered-microfiber**

Project supported by the National Natural Science Foundation of China (Grant Nos. 11304409 and 61705028), the Natural Science Foundation of Chongqing City, China (Grant Nos. csct2013jcyjA4004 and cstc2017jcyjA0893), the Scientific and Technological Research Program of Chongqing Municipal Education Commission, China (Grant No. KJ1500422), and the Postgraduate Research Innovation Foundation of Chongqing City, China (Grant No. CYS17240).

Wang Xiao-Fa^†, Zhang Jun-Hong, Peng Xiao-Ling, Mao Xue-Feng

(color online) The characteristics of mode-locked TDFL: (a)–(e) pulse sequences under different conditions of the pump power (left) and the corresponding optical spectrum (right).