Wavelength conversion devices for photonic switching and optical computing has been expected for the long time. Tunable wavelength conversion is successfully demonstrated using a multi-electrode DFB LD with a saturable absorber. The laser emits coherent light that can be tuned over more than 2. 2 Angstrom by changing its current distribution, when laser light is injected into a saturable absorbing region. This device operated for both TE and TM polarized input. Therefore, the system will be simple to construct because polarization matching is not necessary.