G 657 A1
G.657.A1 Single-Mode Fiber Bend-insensitive fiber built for tight spaces and dense cabling Bending radius as low as 7.5mm, low attenuation across all bands, and full splice compatibility with existing G.652.D networks - for more stable signal performance in FTTH, equipment rooms and building...
- Product Introduction
Bend-insensitive fiber built for tight spaces and dense cabling
Bending radius as low as 7.5mm, low attenuation across all bands, and full splice compatibility with existing G.652.D networks - for more stable signal performance in FTTH, equipment rooms and building cabling.
Why installers and patch cord makers choose this fiber
Fully in-house from preform to cable, with every spec built around fewer callbacks in the field.
Ultra-low bend loss
Additional attenuation stays under 0.10dB after 10 turns at a 10mm bend radius (1550nm) - built for patch panels and desktop cable managers with tight space constraints.
Fully compatible with G.652.D
Mode field diameter closely matches standard fiber, giving low splice loss and small OTDR events against existing networks, with no need to change splicer settings.
Low attenuation across all bands
Covers the O-E-S-C-L bands, meeting the requirements of FTTX, data center interconnects and future L-band expansion.
Fully in-house production
Preform, drawing and secondary coating are all completed in our own facility, avoiding batch inconsistency from outsourced preforms; each batch ships with a traceable test report.
Flexible customization
Custom length, spool type and coating color-coding are available, with support for both sample-batch runs and large-scale orders on different procurement schedules.
Traceable quality
Compliant with ITU-T G.657.A1 and IEC 60793-2-50; every batch comes with a third-party test report, with RoHS or other compliance documents available on request.
Typical applications
Covers dense cabling needs from the last-mile drop to the equipment room.
FTTH drop cables
Multiple bends in stairwells with less splice loss
Data center cabling
Space-saving routing in high-density patch panels
Building cabling
Backbone and horizontal systems in offices and hotels
Patch cords / pigtails
Bend-insensitive raw fiber for cord manufacturers
Drag the slider to see the bend advantage
A visual comparison of signal strength between G657A1 and standard G652D fiber at the same bending radius.
Our product · G657.A1
Standard · G652.D
Illustrative model showing the relative performance trend between the two fiber types, not a plotted measurement curve. Actual attenuation figures are based on third-party test reports.
Technical specifications
Typical values for the standard model; customizable to your network requirements.
| Standard | ITU-T G.657.A1, IEC 60793-2-50 category B6_a1 |
| Mode field diameter (1310nm) | 8.6–9.5 μm |
| Mode field diameter (1550nm) | 9.6–10.6 μm |
| Attenuation (1310nm) | ≤ 0.35 dB/km |
| Attenuation (1550nm) | ≤ 0.21 dB/km |
| Operating wavelength range | 1260–1625 nm (O-E-S-C-L bands) |
| Cladding diameter | 125.0 ± 0.7 μm |
| Coating diameter | 242 ± 5 μm |
| Proof test level | ≥ 100 kpsi |
| Bend performance (10mm radius, 10 turns, 1550nm) | Additional loss ≤ 0.10 dB |
| Bend performance (7.5mm radius, 1 turn, 1550nm) | Additional loss ≤ 0.5 dB |
| Operating temperature | -40°C to +70°C (depends on cable construction) |
| Spooling | Plastic spool / wooden reel / carton, customizable |
| Standard length | 1km / 2km / custom length |
| Standard lead time | 7–15 working days |
| Compliance documents | Factory test report; RoHS and others available on request |
Frequently asked questions
Yes. The two fiber types have similar mode field diameters, so field splicing does not require changing splicer parameters, and splice loss is comparable to a standard G652D-to-G652D splice.
G657A2 supports a smaller bending radius and stronger bend resistance, but has slightly higher splice loss with G652D. G657A1 typically supports a 7.5-10mm bending radius, which covers most FTTH and building cabling needs while remaining more compatible with existing G652D networks. If your installation rarely requires a radius below 7.5mm, G657A1 offers the better balance of cost and compatibility.
We support both small-batch samples and large-volume production orders. Standard specifications typically ship within 7-15 working days, depending on order quantity and customization requirements.
Each production batch is shipped with a factory test report. The product complies with ITU-T G.657.A1 and IEC 60793-2-50, and RoHS or other compliance documentation is available on request.
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