# Fiber Bragg Grating

Pyanodons item · internal name `fbg` · stack size 100 · first craftable in tier 7 (Production science pack, [tier 7](https://factorio.kalzumeus.com/tier/7.md))
HTML page: https://factorio.kalzumeus.com/item/fbg/

## Produced by (1 recipes)

### Fiber Bragg Grating (`fbg`)

- 20 s · tier 7 · productivity modules allowed
- Ingredients: 1 × [Laser module](https://factorio.kalzumeus.com/item/laser-module.md), 1 × [Cladded core](https://factorio.kalzumeus.com/item/cladded-core.md), 1 × [Prepared Glass](https://factorio.kalzumeus.com/item/prepared-glass.md), 4 × [Distributed Bragg Reflectors](https://factorio.kalzumeus.com/item/dbr.md), 2 × [Gallium arsenide](https://factorio.kalzumeus.com/item/gaas.md), 3 × [Acrylic](https://factorio.kalzumeus.com/item/acrylic.md), 500 × [Hydrogen](https://factorio.kalzumeus.com/fluid/hydrogen.md)
- Results: 1 × [Fiber Bragg Grating](https://factorio.kalzumeus.com/item/fbg.md)
- Made in: PCB factory MK 01, PCB factory MK 02, PCB factory MK 03, PCB factory MK 04
- Unlocked by: [Photonics](https://factorio.kalzumeus.com/tech/photonics.md)

## Used in (1 recipes)

- Photonic Chip (`photonic-chip`, tier 7) → [Photonic Chip](https://factorio.kalzumeus.com/item/photonic-chip.md)