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Single-mode fiber optic 4-core model designation

Fiber and communications infrastructure knowledge brief Published 04 Oct 2022

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

The 4-core single-mode fiber optic cable is commonly designated as GYFZY.

Model Designation and Construction

The GYFZ

Y model refers to a 4-core single-mode fiber cable with the following construction features: Loose tube design: Fibers are housed in jelly-filled tubes for protection against moisture and mechanical stress. Central strength member: Non-metallic core provides tensile strength. Water-blocking elements: Includes water-blocking yarns, tape, and mica tape to prevent water ingress.

Outer sheath: LSZH (Low Smoke Zero Halogen) with two red strips for identification. Fiber color coding: Each fiber in the tube is color-coded starting from Blue for easy identification.

Fiber Characteristics

Core type: Single-mode fiber, typically 9 µm core diameter, supporting a single light path for long-distance, high-speed transmission. Attenuation: Minimal loss, with typical values ≤0. 3 dB/km at 1550 nm wavelength.

Strain tolerance: Fiber strain ≤0. 6% without breakage or sheath damage. Loss change: ≤0.

1 dB at 1550 nm under mechanical stress. ApplicationsLong-distance communication: Ideal for telecom backbones, campus networks, and inter-building links. High-speed data transmission: Supports 10 Gbps and higher over distances up to 10 km (OS1) or longer for OS2 fibers.

Indoor and outdoor deployment: Suitable for environments requiring water-blocking and mechanical protection.

Single-

Mode Fiber TypesOS1: Standard single-mode fiber, suitable for indoor applications with moderate distances. OS2: Low-water peak, higher-performance single-mode fiber for long-haul and outdoor applications. In summary, the GYFZY 4-core single-mode fiber cable is a loose-tube, water-blocked, LSZH-sheathed cable designed for high-performance, long-distance optical communication, with each fiber color-coded for easy identification.

Single-mode fiber optic 4-core model designation - ENSAA OPTICAL NETWORKS [PDF]

Single-mode fiber optic 4-core model designation

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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