Ultra-Low Attenuation Large Effective Area Fiber: Maximize OSNR for Long-Haul DWDM

For long-haul and high-speed optical networks, two parameters dominate system performance: attenuation coefficient and effective area (Aeff). The Ultra-Low Attenuation Large Effective Area Fiber (Yangtze Optical Fibre and Cable’s UltraBend® series) optimizes both, delivering superior Figure of Merit (FOM) for next-generation transmission systems.

What Is Large Effective Area Fiber?

Large effective area fiber reduces non-linear effects by increasing the core area where light travels. This allows higher signal power without distortion. When combined with ultra-low attenuation, the fiber enables longer repeater spans, fewer amplifiers, and lower CAPEX/OPEX.

This fiber complies with or exceeds industry standards for G.654 compatible categories, balancing large Aeff with macrobending resistance and hydrogen resistance.

Key Product Advantages

• Larger effective area – Reduces non-linear effects, supports higher signal power
• Longer distance, multi-wavelength, high-speed transmission – Ideal for submarine, backbone, and metro-core
• Lower attenuation loss – Meets long-haul transmission requirements
• Fewer repeaters – Minimizes CAPEX and OPEX
• Lower bending induced loss – Suitable for complex cable routing and all cable structures
• Excellent hydrogen resistance & high nd value – Ensures long-term system reliability
• Compatible with current systems – Future-proof for evolving technologies

How to Evaluate the Contribution of Aeff and Attenuation to Transmission?

According to the OSNR (Optical Signal-to-Noise Ratio) formula:

OSNR = 58 + Pout - NF - 10×log(N) - Att - 10×log(Aeff)

Lower attenuation coefficient and larger effective area directly improve OSNR. The industry uses Figure of Merit (FOM) to quantify this contribution:

FOM = (Aeff) / (attenuation coefficient)

A higher FOM means better system performance. As shown in the comparison below, the Ultra-Strength Fiber (UltraBend®) outperforms both standard ultra-low attenuation fiber and low-attenuation large-effective-area fiber.

FOM Comparison Table

Why Choose This Fiber for DWDM and Long-Haul Networks?

Modern systems require higher launch power to extend distances. However, non-linear penalties increase with power. By increasing effective area, this fiber delays non-linear onset. By lowering attenuation, it maximizes the signal reaching the receiver. The combination yields the best system reach per amplifier span.

FAQ

What is FOM in optical fiber?

FOM (Figure of Merit) = Effective Area (Aeff) / Attenuation Coefficient (α). Higher is better for long-haul systems.

Is this fiber compatible with existing G.652 fibers?

Yes, it is designed for hybrid networks and splices compatibly with standard single-mode fibers while offering superior performance in long spans.

Can this fiber reduce total system cost?

Yes. Fewer amplifiers and repeaters directly reduce both CAPEX (equipment) and OPEX (power, maintenance).

Conclusion: The Ultra-Low Attenuation Large Effective Area Fiber delivers industry-leading FOM, enabling longer spans, higher power, and lower total cost of ownership for backbone, submarine, and high-speed metro networks.