Fig. 1. Structure of OA-FORJ

Fig. 2. Structure diagram of rotor ring

Fig. 3. Structure of D-Lens collimator

Fig. 4. Comparison of spot

Fig. 5. Three kinds of coupling errors

Fig. 6. Coupling loss curves for different MFDs

Fig. 7. Structure of the OA-FORJ

Fig. 8. Coupling loss measurement curve

Fig. 9. Coupling loss curve of D-Lens collimator

Fig. 10. OA-FORJ time measurement system

Fig. 11. PD output waveforms of TECFs with different MFDs

Fig. 12. Temperature sensing system

Fig. 13. Calibration for temperature sensitivity of FBG sensor

Fig. 14. Curve of temperature change with time