Frequency synchronization of Fourier domain harmonically mode locked fiber laser by monitoring the supermode noise peaks

Feng Li, Aiqin Zhang, Xinhuan Feng, P. K. A. Wai
2013 Optics Express  
In a harmonically mode locked laser, the supermode noise peaks in the RF spectrum can be observed directly because they are separated from the driving frequency and its harmonics of the active mode locker. Using a simple theoretical model, we showed that the intensities of the supermode noise peaks will decrease if the coherence of the laser output decreases. We harmonically mode locked a Fourier domain mode locked (FDML) fiber laser to the third order. We observed that the supermode noise peak
more » ... upermode noise peak intensities decrease significantly when the detune between the sweeping frequency of the tunable filter and the cavity resonant frequency increases. It is therefore possible to use the supermode noise peaks to monitor the frequency detune of the tunable filter for auto-calibration of FDML fiber lasers.
doi:10.1364/oe.21.030255 pmid:24514604 fatcat:pc27xirbzzennlw3f4hu6on47e