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 the NLML in TDFL: (a) optical spectrum (inset is the comparison of oscilloscope trace between CSML and NLML); (b) the fundamental RF spectrum with the resolution of 1 kHz and the span of 0.8 MHz (inset is the fundamental RF spectrum with the span of 6 MHz); (c) wideband RF spectrum up to 1 GHz.