Wideband spectrum-sliced ASE source operating at 2 micron region based on double clad ytterbium-sensitized thulium-doped fiber

In this paper, we report a wideband spectrum sliced ytterbium sensitized thulium doped fiber at 2 micron wavelength region. This result was achieved using a simple fiber loop mirror formed by a 2.6 m PMF fiber and a directional coupler. The wide-band spectrum sliced ASE is demonstrated using a 915nm multimode pump ytterbium sensitized thulium doped fiber at a room temperature. Result shows that the spectrum threshold was 786mW and the output spectrum will be increased as the pump power was increase up to 1W. The channel spacing of 3.3nm and extinction ratio of 6 dB was achieved within the wavelength region of 200nm when the output power is 1W. The comb spectrum centred at 1888 nm with peak power of around -55 dBm.