We propose a nanotube-based erbium-doped fiber laser that can deliver conventional\nsoliton (CS) and stretched pulse (SP) based on D-shaped fiber saturable\nabsorber (DF-SA) where evanescent-field interaction works. The novel\nNanotube-based Fiber Laser can generate SP or CS by tuning pump power\nand polarization controller (PC) properly. The net cavity dispersion of laser is\nslightly negative. In our experiment, by optimizing the PC in the cavity, CS\nand SP can be obtained at the central wavelengths of 1530.6 nm and 1530.3\nnm due to on carbon nanotubes and the spectral filtering effect induced by\nnonlinear polarization rotation. Although the acquired CS and SP nearly have\nthe same central wavelengths, they show distinct optical spectra, 3-dB bandwidths.\nThe proposed fiber laser with switchable CS and SP is attractive for\nultrashort pulse generation and fast measurements in practical applications.
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