125 micrometer diameter, how many micrometer tolerance is allowed?
In the fields of telecommunications and fiber optic sensing engineering, for standard single-mode fibers with a nominal cladding diameter of 125\ \mu\text{m} (such as those conforming to ITU-T G.652, ITU-T G.657, or IEC 60793-2-50 specifications), precise technical specifications are required for their Geometric Tolerances:
1. Cladding Diameter Tolerance
- Nominal Value: 125.0\ \mu\text{m}
- Permissible Tolerance (Error Range): In standard grade single-mode fiber specifications, the cladding diameter tolerance is typically controlled within \pm 0.7\ \mu\text{m} (meaning the actual measured value is between 124.3\ \mu\text{m} and 125.7\ \mu\text{m}). In some general industrial specifications, the maximum deviation limit is no more than \pm 1.0\ \mu\text{m}.
2. Other Related Geometric Tolerance Indicators
Fiber geometric tolerances not only include outer diameter variations but also directly affect fiber splicing loss and alignment accuracy:
- Core/Cladding Concentricity Error: Usually required to be \le 0.5\ \mu\text{m}. Core offset can lead to mode field misalignment during splicing or connection, increasing insertion loss.
- Cladding Non-Circularity: Typically required to be \le 0.7\% (or not exceeding 1.0\%).
- Coating Diameter Tolerance: Depends on the coating material. For instance, with conventional acrylate coatings (nominal 255\ \mu\text{m}) or high-temperature polyimide coatings (nominal 155\ \mu\text{m}), the diameter tolerance is usually within the range of \pm 5\ \mu\text{m} to \pm 10\ \mu\text{m}.
Related Official Products and Geometric Parameters
In Beijing Dacheng Yongsheng Technology Co., Ltd.'s (OFSCN®) official product line, products based on the 125\ \mu\text{m} standard cladding diameter include:
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OFSCN® G.652D Optical Fiber: Standard single-mode fiber, core diameter 9\ \mu\text{m}, cladding diameter 125\ \mu\text{m}, coating diameter 255\ \mu\text{m}.
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OFSCN® G.657 Optical Fiber: Bend-insensitive single-mode fiber, core diameter 9\ \mu\text{m}, cladding diameter 125\ \mu\text{m}, coating diameter 255\ \mu\text{m}.
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OFSCN® 300℃ SM Polyimide Optical Fiber: High-temperature resistant polyimide single-mode fiber, produced based on standard G.652D optical preforms, core diameter 9\ \mu\text{m}, cladding diameter 125\ \mu\text{m}, coating diameter 155\ \mu\text{m}.
