A method to compensate the tuned nonlinearity of DFB diode laser in the laser self-heterodyne coherent measuring system

An Ying, Du Zhen-Hui, Liu Jing-Wang, Xu Ke-Xin
2012 Wuli xuebao  
The measuring accuracy of self-heterodyne coherent measuring system can be deteriorated by the tuning nonlinearity of the diode laser with injection current. The tuning characteristics of a DFB laser were analyzed, a mathematical model for compensating Mach-Zehnder interferometer based self-heterodyne system was presented. The dynamic frequency modulation coefficient of the model was built by prior beat frequency of foregone optical path difference. The relative error of predicted beat
more » ... is reduced about 3%. This method could simplify the setup of the system, and is especially suited for online tunable laser measurement system.
doi:10.7498/aps.61.034207 fatcat:m7lpq3kuivagvj3xof6bs6cewi