The design of wavelength tuning and stability control of tunable lasers is introduced and its feasibility verified by tests.The design scheme consists of temperature control

bias current control and wavelength locker circuits.The temperature control circuit is used for cursory tuning

the bias current circuit for fine tuning and the wavelength locker circuit for feedback of external temperature variations.It is applicable to the design of the driver circuit of the temperature control-based tunable DFB laser.