Multi-wavelength optical source based on amplified spontaneous emission of erbium doped fiber

We report on a spatial separated wavelength optical source for high density WDM application. Partially feedback diffracted spontaneous emission, able multiple lasing oscillations in erbium doped fiber medium. Each wavelength is spatially separated, showing narrow linewidth and stable oscillations. Four simultaneously wavelength operation was demonstrated. FWHM laser linewidth was measured to be as narrow as 1 GHz.