Fig. 1. Schematic of optical frequency synthesis. (a) Diagram of optical frequency synthesizer; (b) diagram of optical frequency divider

Fig. 2. Experimental setup diagram

Fig. 3. Program flow chart of automation control

Fig. 4. Processing block diagram for control signal for output laser frequency

Fig. 5. Performance evaluation of optical frequency synthesizer. (a) Variations of wavelength of output laser and fb2-m during frequency setting process [(I) represents laser frequency coarse tuning, (II) represents laser frequency tuning according to wavemeter, and III represents fine according to fb2]; (b) frequency instability of beating signal between optical frequency synthesizer and the second harmonic of cavity-stabilized 1557 nm laser; (c) scanning test of output frequency of optical frequency s