A wavelength locking scheme for semiconductor laser systems based on an interpolation algorithm

An interpolation algorithm technique to automatically lock the wavelength of semiconductor laser systems by balancing the temperature and bias current of the laser is demonstrated. The wavelength accuracy is +20 pm in the bias current range of 30-120 mA for typical distributed feedback lasers and electroabsorption modulated lasers. This method is software based and does not require any optical or electrical wavelength locking circuitry.