Table 1.
Comparisons of different OFSs for TSP sensing and measurement.
| Type | Structure | ST (nm/°C) |
SS (nm/‰) |
SP (nm/MPa) |
Fabrication Difficulty | Sea Trial |
|---|---|---|---|---|---|---|
| FBG | 0.0094 [76]–1.054 [111] | 0.00358 [78]–0.0708 [120] | 0.5 [120]–24.95 [75] | Medium | √ | |
| SPR | 1.802 [121]–7.609 [79] | 0.00558 [85]–1.402 [79] | 1.42 [119]–2.838 [121] | Difficulty | √ | |
| Interferometric OFS | FPI | 0.249 [114]–6.85 [92] | 50 [92] | 1.13 [114] | Medium | - |
| MZI | 0.05 [48]–6 [49] | 0.0194 [66]–3.42 [68] | - | Easy | - | |
| SI | 0.0149 [69]–1.73 [53] | 0.75 [70] | - | Easy | - | |
| Hybrid OFS | FBG MZI | 0.0107 [118]–38.38 [63] | - | - | Medium | - |
| FPI MZI | 0.4 [108]–2.767 [110] | 0.244 [110]–2.7 [108] | - | Medium | - | |
| FPI FBG | 306.2 [117] | - | 5.014 × 105 [117] | Medium | √ | |
| Microfiber | MKR | 0.02281 [73]–8.48 [61] | 0.02118 [58] | - | Medium | - |
| OMC | 1.0074 [100]–2.326 [122] | 0.3037 [101]–1.596 [122] | 0.169 [122]–3.416 [115] | Difficulty | - | |
| MMZI | 0.14 [102]–7.41 [116] | 0.064 [102] | 13.31 [116] | Easy | √ | |
√ Means that sea trials of these sensors have been reported.