→ ↑ Document 目 10% 11:45 AM DFB laser as compared to a conventional laser (Fabry-Perot) has larger spectral width smaller spectral width equal spectral width if the energy level of an LED were E1=0.6 eV, E2= 1.6 eV, then the emitted photons :wavelength will be 1.24 um 1.56 um 0.83 um