Backward Protection Isolator
Isolator option that handles backward-travelling light away from the input fiber, cutting the temperature rise caused by back-reflection.
Technical overview
Shinkosha presents backward protection as a capability demonstrated by thermal imaging rather than as a separately specified model. In its published test, 3 W of 1064 nm light injected backwards for 5 minutes drove the input fiber to a peak of 112.6 C without backward protection and 48.1 C with it. No wavelength range, power rating, insertion loss, isolation or package dimensions are published for this option, and Shinkosha does not state which isolator configurations can carry it.
Features
- Reduces input-fiber heating caused by backward-propagating light
- Demonstrated by Shinkosha with thermal imaging at 1064 nm, 3 W backward input
Specifications
| Parameter | Value |
|---|---|
| Peak input-fiber temperature WITHOUT backward protection (1064 nm, 3 W backward, 5 min) | 112.6 degC |
| Peak input-fiber temperature WITH backward protection (1064 nm, 3 W backward, 5 min) | 48.1 degC |
| Test condition, backward input | 1064 nm, 3 W, 5 minutes |
Applications
- Fiber lasers exposed to high back-reflection from the workpiece or downstream optics
- Protecting an isolator's input fiber from thermal damage
Blocked on: Jake / manufacturer. This block is intentionally styled to be unmistakable — it is not draft copy, it is absent copy.
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