G657 A1 Single Mode Optical Fiber
G.657.A1 · SINGLE-MODE OPTICAL FIBER G.657.A1 Single Mode Optical Fiber China Super Tech Co., Ltd. supplies G.657.A1 single mode optical fiber with a bend-optimized design for optical cable and access-network applications. It is designed according to the ITU-T G.657.A1 recommendation...
- Product Introduction
G.657.A1 Single Mode Optical Fiber
China Super Tech Co., Ltd. supplies G.657.A1 single mode optical fiber with a bend-optimized design for optical cable and access-network applications. It is designed according to the ITU-T G.657.A1 recommendation while maintaining compatibility with conventional G.652.D single-mode transmission systems.
Its controlled bending performance makes it suitable for installation environments where routing space is limited, including FTTH, indoor access networks, building cabling and compact fiber distribution systems.
Product Introduction
G.657.A1 Single Mode Optical Fiber from China Super Tech Co., Ltd. uses a bend-optimized optical design to provide controlled bending performance while maintaining the transmission characteristics expected from G.652.D-compatible single-mode fiber.
The fiber is suitable for routing environments where smaller bend radii may be required, including residential access networks, indoor building cabling and other space-constrained optical installations.
For projects comparing different bend-performance grades, see our Bend Insensitive Single Mode Fiber range.
Product Features
Enhanced Bend Performance
The fiber uses a bend-optimized refractive-index structure. A low-refractive-index trench-assisted region around the core helps improve light confinement when the fiber is bent.
Compared with conventional G.652 single-mode fiber, the design allows a smaller routing radius. Under a 10 mm bend radius and one-turn test condition, the additional loss at 1550 nm can be controlled within the specified product limit.
Stable Transmission Performance
Although G.657.A1 focuses on bend performance, the fiber maintains optical parameters compatible with conventional G.652.D single-mode systems.
This means the fiber can be integrated into straight-route transmission sections without changing the basic single-mode transmission architecture. Mode field characteristics and other optical parameters are controlled to support stable system integration.
Reliable Long-Term Handling
The fiber uses a dual-layer acrylate coating structure. The inner and outer coating layers provide mechanical protection and help buffer stress generated during handling, bending and installation.
This coating configuration is intended to reduce the risk associated with repeated mechanical stress and support stable fiber handling during cable production and installation.
Good Splicing Compatibility
Because the fiber is designed to remain compatible with mainstream G.652.D single-mode systems, its optical characteristics are suitable for integration with commonly used single-mode fibers and optical components.
This can help reduce additional adjustment requirements during field splicing and cable assembly when the selected specifications are compatible with the existing system.
Product Applications
G.657.A1 is particularly useful when optical fiber must be routed through compact spaces while maintaining conventional single-mode transmission characteristics.
FTTH Fiber Installation
In residential FTTH installations, optical fiber may need to follow wall corners, door frames, narrow conduits and compact terminal boxes. The bend-optimized structure helps reduce additional loss caused by bending under specified conditions.
For related procurement considerations, see our G.657 Fiber for FTTH: What Should Buyers Check Before Ordering?
Building Structured Cabling
Office buildings, residential buildings and commercial facilities often require fiber to pass through distribution racks, cable trays and compact routing areas. G.657.A1 can help reduce the additional optical loss associated with specified bending conditions.
Data Center Rack Cabling
Compact rack environments can require optical fibers to follow short routing paths around equipment, patch panels and fiber management areas. The smaller design radius of G.657.A1 provides additional routing flexibility where installation space is restricted.
Existing Building Network Upgrades
Existing buildings may have limited conduit space or difficult cable-routing conditions. A bend-optimized fiber can provide additional routing flexibility while reducing the need to modify existing pathways.
Choosing the Right Bend-Performance Grade
G.657.A1 is designed for applications that require improved bend performance while maintaining compatibility with conventional single-mode network systems.
If your installation requires a smaller reference bend radius, you can also review our G.657.A2 Fiber .
For a broader product selection, visit our Bend Insensitive Fiber G.657 page.
Customization Services
Different coating colors can be supplied according to customer identification and cable-production requirements. Fiber delivery length can also be coordinated with the actual production quantity to reduce unnecessary cutting and material waste during downstream processing.
For different environmental or cable-construction requirements, coating configurations can be discussed according to the intended application. The objective is to maintain suitable mechanical handling and environmental performance within the specified operating conditions.
Fiber can be supplied on optical fiber spools or in other agreed packaging formats. Packaging protection can be coordinated with the transportation method and delivery distance to reduce the risk of damage during long-distance shipment.
For projects with specific transmission distance, attenuation or bend-loss requirements, our technical team can review the application conditions and help confirm an appropriate fiber configuration rather than simply applying a standard specification.
Technical Specifications
The following specifications are based on the supplied product configuration. Final technical values should be confirmed against the agreed purchase specification and applicable inspection documentation.
| Applicable Standard | ITU-T G.657.A1 / G.652.D |
|---|---|
| Operating Wavelength | 1310 nm / 1550 nm |
| Mode Field Diameter @ 1310 nm | 8.6–9.5 μm |
| Cladding Diameter | 125.0 ± 0.7 μm |
| Coating Diameter | 245 ± 10 μm |
| Attenuation @ 1310 nm | ≤ 0.36 dB/km |
| Attenuation @ 1550 nm | ≤ 0.22 dB/km |
| Chromatic Dispersion @ 1550 nm | ≤ 18 ps/(nm·km) |
| Bend Loss, 10 mm Radius, 1 Turn | ≤ 0.75 dB @ 1550 nm |
| Cutoff Wavelength | ≤ 1260 nm |
| Proof Test | ≥ 0.69 GPa (100 kpsi) |
| Operating Temperature Range | −40°C to +70°C |
What Information Should You Provide for a Quote?
For an initial product evaluation, buyers normally only need to provide the basic application conditions rather than a complete technical specification.
Please provide the intended application, indoor or outdoor installation environment, approximate fiber length or project quantity, operating wavelength and any specific bend-radius requirement if available.
Based on these details, we can review the required fiber configuration, customization options and packaging requirements.
Frequently Asked Questions
The main difference is bending performance. G.657.A1 is designed to reduce additional optical loss under smaller bend-radius conditions while maintaining compatibility with conventional G.652.D single-mode transmission systems.
This allows G.657.A1 to be considered for compact FTTH, indoor cabling and other applications where routing space is limited.
Under the supplied specification, the additional loss at a 10 mm bend radius and one turn is limited to ≤0.75 dB at 1550 nm.
The actual installation should still follow the specified bend radius and the complete cable construction requirements. Bend-insensitive does not mean that the fiber can be bent without limitation.
Yes. G.657.A1 is designed to maintain compatibility with conventional G.652.D single-mode systems. Its optical characteristics are intended to support integration and splicing with mainstream single-mode fiber systems when the relevant specifications are matched.
The dual-layer acrylate coating structure is designed to provide mechanical protection and buffer stress during handling and bending.
Long-term performance still depends on maintaining the specified minimum bend radius and avoiding excessive mechanical stress during cable production and installation.
Yes. Color, delivery length, coating configuration and packaging can be discussed according to project requirements. For projects with specific optical requirements, the target attenuation, mode field characteristics or bend-loss requirements can also be reviewed before production.
For an initial evaluation, buyers can provide the intended application, indoor or outdoor environment, approximate installation distance, operating wavelength and any special bend-radius requirement.
We can then help confirm whether G.657.A1 is suitable and whether any customized specification is required.
Need G.657.A1 Fiber for Your Project?
Send us your required fiber grade, wavelength, fiber length, bend-radius requirement and packaging specifications. China Super Tech can help confirm the appropriate G.657.A1 configuration for your application.
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