Double-clad FBGs are referred to as writing gratings on the passive double-clad fiber. For fiber laser application, the doped double-clad fiber is used as an active medium, and double-clad FBGs on matching passive fiber are used as cavity mirrors, which play an irreplaceable role for fiber laser.
| Parameters | Units | Specifications | Tolerance |
| Center Wavelength Rang | nm | 1030~1080 | ±0.3 |
| Reflectivity | - | 0.5%~99.9% | ±5% |
| FWHM | nm | 0.1~1.5 | ±0.05 |
| SMSR | - | >8dB | |
| Recoating | - | Low Refractive Index Material or Custom | |
| Proof Test | - | >100Kpsi | |
| Fiber Type | - | Custom | |
| Operating Temperature | ℃ | 0~75 | |
| Storage Temperature | ℃ | -20~85 | |
| Termination | - | Bare fiber，FC/PC，FC/APC, etc | |
Fiber laser、Pump lockers、Fiber sensor
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