Fig. 1. System structure diagram of laser frequency tuning ratio testing equipment based on PCFR

Fig. 2. Simulated resonance signal of PCFR

Fig. 3. Processing flow of laser frequency tuning ratio testing signal

Fig. 4. Prototype of laser frequency tuning ratio testing equipment and photo of PCFR. (a) Testing equipment; (b) photo of PCFR

Fig. 5. Measured resonance curves by frequency sweep of narrow line-width fiber laser

Fig. 6. Measured frequency tuning ratio of narrow line-width fiber laser

Fig. 7. Measured resonance curves using frequency sweep of narrow line-width semiconductor laser

Fig. 8. Measured frequency tuning ratio of narrow line-width semiconductor laser

Fig. 9. Measured frequency tuning ratio of PMF and PCF resonator at variable temperatures