Microstructures in Polymer Fibres for Optical Fibres, THz Waveguides, and Fibre-Based Metamaterials

Table 3

Comparison of mPOF, POF, and silica LPG and FBG responses.

Grating type	Strain response (nm/%)	Temperature response (nm/°C)	Humidity response (nm/10%)
mPOF LPG PMMA; (vis)	−11 [92–94]; −5.4 [95]	0.2 [96]	0.5 [97]
mPOF FBG PMMA; (~1550 nm)	13 [105, 109]	−0.08* [102]; −0.05^# [102]
mPOF FBG PMMA; (~800 nm)	7.1 [103, 109]
mPOF FBG Topas; (~1550 nm)		−0.04 [108]	0.006 [107]
mPOF FBG Topas; (~800 nm)	6.4 [107]	−0.08 [107]	<0.007^∧ [107]
POF FBG PMMA; (~1550 nm)	13 [109]	−0.055 [110]	0.35 [110]
POF FBG PMMA; (~800 nm)	7.1 [109]
Silica FBG; (~1550 nm)	13 [111]	0.014 [110, 111]	0.0028^~ [110]

Data taken or inferred from references as indicated. *For unannealed fibre. ^#For annealed fibre. ^∧Worst case scenario, real value likely to be much lower. ^~Likely due to the polymer coating on the silica fibre, not the silica itself. Note that the response may also depend on the details of the fibre structure.