Introduction: GM8020C/L/CL multi-ouput tunable laser source is developed from an advanced semi-conductor laser technology. GM8011XXX produces high power, high precision tunable laser output through multiple control loops and internal isolation. Wavelength tuning precision of 10pm (3 pm typical) can be achieved with 20mW output. GM8020C/L/CL can be integrated with VOAs and optical power meters according to customer’s need to form an optical measurement system with the synchronized automatic wavelength sweep function. GM8020C/L/CL are specially design for high volume, low cost production line.