Optical Fiber Identification Mark Interval and Coating Modulus
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Solution Overview
Problem
Optical fibers with identification marks experience increased transmission loss due to stress and micro bend loss, especially when the effective area of the optical transmission medium is increased, making it challenging to maintain low transmission loss during processing and long-distance transmission.
Innovation Solution
The optical fiber design includes a primary resin layer with a Young's modulus of 0.9 MPa or less and identification marks on the secondary resin layer at intervals between 100 mm and 500 mm, which reduces micro bend loss and maintains low transmission loss at 1550 nm, while allowing for easy identification during cable work.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If identification marks are provided on the optical fiber surface, then optical fiber identification is enabled, but transmission loss increases due to stress and micro bend loss
Solution Approach 1:
The patent applies local quality by creating identification marks only on the outer surface of the secondary resin layer, while maintaining the optical transmission medium's properties unchanged. The marks are localized to the coating layer, allowing identification without affecting the core optical performance.
Solution Approach 2:
The patent changes the physical parameters of the primary resin layer by controlling its Young's modulus to be 0.9 MPa or less, and sets the identification mark interval to 100-500 mm. These parameter adjustments reduce micro bend loss while maintaining identification capability.
2Reliability
If the effective area of the optical transmission medium is increased, then non-linearization is reduced, but transmission loss increases due to sensitivity to lateral pressure
Solution Approach 1:
The patent changes the mechanical parameter of the primary resin layer by setting its Young's modulus to 0.9 MPa or less. This parameter adjustment allows the fiber to accommodate lateral pressure without increasing transmission loss, enabling use in long-distance applications with larger effective areas.
Solution Approach 2:
The patent uses a composite structure with a primary resin layer (soft resin, low Young's modulus) and a secondary resin layer (hard resin, high Young's modulus). This composite material approach combines the flexibility needed for non-linearization resistance with the structural integrity needed to maintain low transmission loss.
3Ease of operation
If identification marks are provided at smaller intervals, then identification ease is improved, but transmission loss increases due to increased micro bend loss
Solution Approach 1:
The patent optimizes the identification mark interval parameter to fall within 100-500 mm. This parameter setting balances identification ease with transmission loss control, allowing practical identification while maintaining low micro bend loss.
Solution Approach 2:
The patent localizes identification marks to the secondary resin layer surface, concentrating the identification function in a specific location. This allows marks to be placed at optimal intervals without affecting the overall fiber structure or optical performance.
Data Source
AI summary
Provided is an optical fiber having identification mark, which includes an optical transmission medium (exemplified by glass fiber) including a core part and a cladding part, a primary resin layer coating the optical transmission medium, and a secondary resin layer coating the primary resin layer, in which identification marks for optical fiber identification (exemplified by continuous identification mark) are provided on a surface of the secondary resin layer at a predetermined interval along an axial direction of the optical transmission medium. An effective area of the optical transmission medium at a wavelength of 1550 nm is 90 μm2 or more, the predetermined interval is 100 mm or more and 500 mm or less, and a Young's modulus of the primary resin layer is 0.9 MPa or less.