40 mW over DFB laser module with integrated wavelength monitor for 50 GHz channel spacing DWDM application

We fabricated an over 40 mW DFB laser module with integrated wavelength monitor employing an etalon filter. An evaluation of this module with a simple feedback circuit, showed that the effect of wavelength drift factors, such as the injection current and case temperature, are small enough for 50 GHz channel spacing DWDM applications.