Single Mode Optical Fiber G652.D

G652.D Low Water Peak Non-Dispersion Shifted Single Mode Optical Fiber

Description of Single Mode Fiber G652.D:

G652D is a core specification of ITU-T Recommendation G.652 (the most widely used single-mode optical fiber standard globally). It is an optimized variant of the G652 series, designed to address transmission limitations of earlier versions (e.g., G652A/B/C) and adapt to the high-bandwidth, long-distance demands of modern optical communication networks (such as 5G backhaul, data center interconnection (DCI), and long-haul backbone networks). Below is a comprehensive breakdown of its definition, technical characteristics, performance advantages, applications, and standards.

1. Core Definition & Classification Background

• Standard Source: Defined by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) in Recommendation G.652: Single-mode optical fibers and cables for use in telecommunication networks.

• Series Classification: The G652 series includes four main variants (A/B/C/D), with G652D being the latest and most versatile version. It inherits the basic structure of G652 fibers (step-index single-mode design) while eliminating key limitations of earlier versions (e.g., narrow usable wavelength range, high water peak loss).

• Core Function: As a single-mode fiber (SMF), it transmits only one transverse mode of light (the fundamental mode) at the working wavelength, minimizing modal dispersion—this is the core reason it supports long-distance (tens to hundreds of kilometers) and high-speed (10Gbps/100Gbps/400Gbps) transmission.

2. Key Structural & Material Characteristics

The physical structure and material selection of G652D determine its basic performance. Its cross-section follows a three-layer design, as shown below:

Note: The total diameter of G652D (including coating) is usually 250 μm, which is compatible with standard optical fiber connectors (e.g., SC, LC) and cabling systems.

Features:

(1) Superior to the ITU-T G.652D recommendation and IEC 60793-2-50 B1.3 specification.

(2) Designed for operation over 1260nm to 1625nm wavelength spectrum.

(3) Outstanding optical performance supporting high-speed transmission requirement of DWDM and CWDM.

(4) Excellent PMD performance, supporting high-speed and long repeater spacing transmission system.

(5) Compatible with existing 1310nm equipment.

Typical Application Scenarios:

(1) 5G Mobile Communication Networks

• Fronthaul/Backhaul: Transmits 5G base station signals (e.g., CPRI protocol) between base stations and core networks. The O-band (1260–1360 nm) is used for short-distance fronthaul (≤10km), while the C-band (1530–1565 nm) supports 100Gbps+ backhaul (50–100km).

(2) Data Center Interconnection (DCI)

• Connects geographically distributed data centers (e.g., between two data centers 50–200km apart). Supports 400Gbps/800Gbps DWDM systems via C/L-bands, meeting the demand for large-scale data replication and low-latency transmission.

(3) Metro & Long-Haul Backbone Networks

• Metro Networks: Carries multi-service traffic (e.g., video, voice, data) in cities. The wide wavelength window allows flexible allocation of wavelengths for different services.

• Long-Haul Networks: Combined with erbium-doped fiber amplifiers (EDFAs) and dispersion compensation, G652D supports 100Gbps+ transmission over 800–1000km (e.g., inter-provincial or inter-city backbone links).

(4) Fiber-to-the-X (FTTx)

• Used in FTTB (Fiber-to-the-Building) and FTTH (Fiber-to-the-Home) systems. Its low loss ensures that signals can reach end-users without amplification (typical FTTx distances are ≤20km).

Changrong's Fiber Workshop View:

• 9 Fiber Drawing Towers ( 2 lines/Tower, totally 18 Production Lines)

• Annual Output 15,000,000 kilometers

• Full Sets of Cutting-edge Testing Equipment

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