Figure 3
From: Wavelength and pulse duration tunable ultrafast fiber laser mode-locked with carbon nanotubes

Typical transmission spectra of the TBWF. (a) Bandwidth tunable spectra with fixed central wavelength of 1559 nm. FWHMs of the transmission spectra are continuously enlarged from 1 nm to 11 nm. (b) The central wavelength of the transmission spectra is tuned from 1524 nm to 1559 nm as the spectral bandwidth is compressed to ~1.2 nm.