Analysis of the Reasons for Color Differentiation of Fiber Sheath

　　The differences in fiber sheath colors (e.g. black, white) are mainly due to the requirements of industry standards, application scenarios, and technical specifications. The following are the specific reasons:

　　1. Industry standards and labels

　　Organizations such as the International TelecoMMunication Union (ITU-T) have standardized labeling requirements for fiber types (e.g. single-mode, multimode) and tranSMission wavelengths (e.g. 1310nm, 1550nm).

　　Color coding example:

　　Black: Common in single-mode fibers (for long-distance transmission), or fibers with specific wavelengths (e.g. 1550nm).

　　White: May be used for multimode fiber (short-distance transmission), or for bend-insensitive fiber (e.g., G.657 class, suitable for dense wiring).

　　2. Application scenario adaptation

　　Outdoor environment: Black sheath is more resistant to dirt and suitable for overhead or pipe wiring.

　　Indoor environment: White sheathing is easier to recognize in computer rooms, offices, and other scenarios, making it easier to maintain and manage.

　　3. Vendor-defined standards

　　Some manufacturers define colors based on fiber type, sheath material, or performance class.

　　Low smoke halogen-free sheath: May be white to distinguish flame retardant properties.

　　Anti-UV sheath: Black is often used in outdoor optical fibers to enhance anti-aging capabilities.

　　4. User requests and compatibility

　　Network segmentation: Different colors can distinguish different networks (e.g. telecommunications networks, local area networks).

　　Fusion matching: The same color may represent the same fiber type to avoid welding errors.

　　Precautions

　　Color is not an absolute standard: different manufacturers may use different codes, which need to be confirmed in combination with specific model parameters.

　　Key parameters are preferred: When selecting an optical fiber, the transmission mode, wavelength, and attenuation index should be the core, and the color should only be used as an auxiliary identification.

　　Summary: The differences between black and white fibers are mainly due to industry norms, environmental suitability, and manufacturer definitions. Users need to choose according to specific scenarios and technical requirements, and refer to the manufacturer's documentation to confirm the corresponding relationship between color and performance.