1. G.657A1 Technical Characteristics
Bending Performance: The macro-bending performance is better than traditional G.652D, but weaker than G.657A2/B3, supporting a minimum bending radius of 10mm (loss ≤ 0.75dB@1550nm for one loop macro-bend Ф20mm).
Optical Parameters: In the O S C L wavelength band (1260~1625nm), the attenuation coefficient is ≤0.36dB/km@1310nm, ≤0.22dB/km@1550nm, with zero dispersion wavelength between 1300~1324nm.
Compatibility: The mode field diameter (MFD) is 8.6±0.4μm@1310nm, which is close to G.652D (9.2±0.4μm), ensuring low splice loss.
Application Scenarios
Mainly used for short-distance wiring in FTTX (Fiber To The Home) and special cable structures, such as semi-tight buffered tube connector assemblies.Divided into A type and H type, with H type having a longer delivery length (2.1~75.6km), suitable for different construction needs.

2. G.657A2 Technical Characteristics
Bend Performance: The bending radius can be as low as 7.5mm (with a loss of ≤0.15dB@1550nm when coiled into a circle of Ф10mm), with bend performance significantly better than G.657A1610.
Optical Parameters: Attenuation coefficient ≤0.35dB/km@1310nm, ≤0.21dB/km@1550nm, supports full-band transmission, and zero dispersion slope ≤0.1ps/(nm²·km).
Compatibility: MFD is 8.6±0.4μm@1310nm, compatible with G.652D, suitable for mixed use with existing equipment.
Application Scenarios
Mainly used in high-density wiring scenarios, such as data center patch cords (e.g., LC/UPC patch cords) and invisible cables, due to the transparent sheath design that can blend into indoor environments.Suitable for FTTH terminal installations that require frequent bending.

3. G.652D Technical Characteristics
Full-band support: Covers 1260~1625nm (including E-band), eliminates the 1383nm water peak, increases spectral bandwidth by 50%, and supports CWDM/DWDM system upgrades.
Optical parameters: Attenuation coefficient ≤0.34dB/km@1310nm, ≤0.20dB/km@1550nm, PMD ≤0.15ps/√km, suitable for high-speed long-distance transmission.
Bending performance: Relatively weak bending resistance, macro bend testing requires a radius of Ф32mm (1 turn loss ≤0.05dB@1550nm).
Application scenarios:
Traditional backbone networks, metropolitan networks, and upgrading scenarios compatible with old systems, such as voice, data, and video transmission.Compatible with G.657 series, used in the backbone part of mixed fiber links.

4. G.657B3 Technical Characteristics
Ultimate bending performance: The bending radius is only 5mm (1 loop loss ≤ 0.10dB @ 1550nm), with the strongest anti-bend performance among the four types, and it has no bending memory residual.
Optical parameters: Attenuation coefficient ≤ 0.35dB/km @ 1310nm, ≤ 0.21dB/km @ 1550nm, MFD is 8.6±0.4μm @ 1310nm, compatible with G.652D.
Mechanical performance: Dynamic fatigue parameter ≥ 20, screening tension ≥ 9.0N, ensuring construction strength.
Application Scenarios
Specifically designed for high-end FTTH, such as invisible wiring in villa areas and apartments; 900μm skin fiber cables can fully integrate into the decoration environment.Suitable for terminal installations in extremely curved environments (such as corners and narrow ducts).

Summary

l  G.652D: Suitable for long-distance, high-speed transmission, compatible with traditional equipment, but with weaker bending performance.

l  G.657A1/A2: Gradually enhanced bending performance, suitable for FTTH and dense cabling scenarios, A2 is superior.

l  G.657B3: Specifically designed for extreme bending, making it an ideal choice for concealed wiring and complex environments.