Fig. 1. Transmission loss of PMMA polymer optical fiber^[53]

Fig. 2. Transmission loss of PC polymer optical fiber^[62]

Fig. 3. Transmission loss of Zeonex polymer fiber and TOPAS polymer fiber^[67]

Fig. 4. Transmission loss of CYTOP polymer optical fiber^[36]

Fig. 5. SPR transmission spectra of polymer fiber tilted Bragg grating. (a) Small angle tilted^[100]; (b) tilt angle of 6°^[101]

Fig. 6. Reflected spectral power of a chirped POFBG fabricated by different techniques. (a) Chirped phase mask^[103]; (b) femtosecond directly writing^[104]; (c) under 1.6% strain with tapering method^[105]; (d) thermal annealing^[106]

Fig. 7. PS-FBG fabrication by 248 nm irradiation. (a) Moiré overlapping^[107]; (b) narrow blocking in the center^[108]

Fig. 8. Respiratory heart rate monitoring based on Zeonex polymer fiber Bragg grating^[92]

Fig. 9. Medical monitoring system based on CYTOP polymer fiber Bragg grating array^[110]. (a) (b) Position of armrest and fiber; (c) reflection spectrum of grating array

Fig. 10. Chirped POFBG for quasi distributed temperature measurement^[111]. (a) System diagram; (b) chirped POFBG to measure Gaussian temperature gradient

Fig. 11. Schematic diagram of the graphene based POFBG probe^[20]

Fig. 12. Schematic diagram of small all-polymer fiber Bragg grating pH sensor^[115]

Fig. 13. Tunable chirped POFBG^[116]. (a) Relationship between the reflected spectral power and the strain; (b) relationship between the group delay and the strain

Fig. 14. Novel all optical modulator of polymer nano Bragg grating based on femtosecond laser two-photon polymerization printing. (a) Static optical pumping test system; (b) change of transmission spectrum; (c) relationship between Bragg resonance wavelength and pump power^[96]