Fig. 1. Experimental setup for optical frequency drift measurement based on delay self-heterodyne interferometer

Fig. 2. The experiment result for optical frequency drift of the frequency stabilized DFB-LD within10 ms based on delay self-heterodyne interferometer. (a) The first group (14.04- −3.33 MHz, 17.37 MHz); (b) The second group (18.24- −6.28 MHz, 24.52 MHz); (c) the third group (3.24- −17.17 MHz, 20.41 MHz)

Fig. 3. Experimental setup for frequency drift measurement of frequency stabilized laser based on fiber femtosecond optical frequency comb

Fig. 4. Experimental result of beat signal between DFB-LD with femtosecond optical frequency comb system

Fig. 5. The experiment result for optical frequency drift of the frequency stabilized DFB-LD within 50 minutes based on the femtosecond optical frequency comb system