A broadband light source includes: at least two semiconductor optical active devices for generating TE polarized lights of different wavelength bands; an optical coupler for dividing each of the TE polarized lights input from each of the semiconductor optical active devices into two TE polarized lights, and outputting the two TE polarized lights, the two TE polarized lights including a first TE polarized light and a second TE polarized light; a first optical line for transmitting the first TE polarized light, while maintaining a polarization mode of the first TE polarized light; a second optical line for converting the second TE polarized light into a TM polarized light; a polarization beam combiner for combining the first TE polarized light and the TM polarized light to generate a polarization-independent light; and a band separator for separating and outputting the polarization-independent light according to wavelength bands.