G657A2

G.657.A2 fiber is a subclass of bending-insensitive single-mode fiber defined by the International Telecommunication Union ITU-T. It belongs to the G.657 A category and was added in the G.657 standard revision in 2009. Its model naming follows the combination rule of "G.657" standard code, "A" category (compatible with G.652 fiber) and "2" bending grade (minimum bending radius of 7.5 mm) [20]. Its minimum bending radius can reach 7.5 mm and is backward compatible with G.652.D fiber. It is suitable for transmission in the 1260-1625 nanometer band. Between 2025 and 2026, under the influence of the demand for AI data centers and military drones, its global market demand has increased, and both price and production and sales have increased. Some companies' orders have been scheduled to be produced until the first quarter of the following year.

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Description

Technical Parameters

fiber G6657A2

Features

Good bending loss characteristics, less bending loss.
Smaller fiber sizes of 200 μm are available, and the design cross-sectional area of the cable is reduced by more than 30%.

Application Scenarios

• High density metropolitan area network and narrow space access network
• Blowing tiny cables
• FTTx

G.657.A2 fiber is a type of bend-insensitive single-mode fiber defined by the International Telecommunication Union (ITU-T) G.657 standard. It belongs to the G.657 A category and is compatible with G.652 fiber. This standard was first published in 2006, and in its 2009 revision, based on compatibility with G.652 fiber and the principle of minimum bending radius, G.657 fiber was subdivided into several subcategories. G.657.A2 is one of the newly added subcategories. This revision was officially adopted by the ITU-T in December 2009. The new standard introduced three bending grades (1, 2, and 3) based on the minimum bending radius. G.657.A2 belongs to bending grade 2, corresponding to a minimum bending radius of 7.5 mm. The most significant feature of G.657.A2 optical fiber is its excellent bending resistance.

This optical fiber is mainly used in scenarios requiring high bending adaptability, such as fiber-to-the-home, indoor cabling, and data center rack patching. It is particularly suitable for miniaturized optical cable designs such as butterfly drop cables. With the construction of AI data centers and the development of the low-altitude economy, its application has expanded to emerging fields such as data center interconnect (DCI) and UAV fiber guidance. The ITU-T first released the G.657 optical fiber standard in 2006, aiming to solve the bending loss problem in access networks.

Technical Specifications and Performance Characteristics

Bending performance

Minimum bending radius of 7.5 mm; additional attenuation when wound once at a 7.5 mm radius is ≤0.5 dB at 1550 nm and ≤1.0 dB at 1625 nm.

Attenuation coefficient

≤0.35 dB/km at 1310 nm.
≤0.21 dB/km at 1550 nm.
≤0.23 dB/km at 1625 nm.

Geometric dimensions

Cladding diameter of 125.0 ± 0.7 μm; core-cladding concentricity error ≤0.5 μm; coating diameter of 243–245 μm

Compatibility

Fully compatible with G.652.D optical fiber; allows for direct fusion splicing into existing networks; operating wavelength covers the full 1260–1625 nm range (O, E, S, C, and L bands).

We do not manufacture optical fibers.

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We focus exclusively on the production of optical cables.

standardized production

The optical fibers are all externally procured from well-known brands,ZTT,YOFC,HTGD

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Technical Characteristics

Parameter	Conditions	Units	Value
Optical
Attenuation	1310nm	dB/km	≤ 0.350
	1383nm	dB/km	≤ 0.350
	1550nm	dB/km	≤ 0.210
	1625nm	dB/km	≤ 0.230
Attenuation vs. Wavelength	1310nm VS. 1285- 1330nm	dB/km	≤ 0.05
Attenuation vs. Wavelength	1550nm VS. 1525- 1575nm	dB/km	≤ 0.04
Zero Dispersion Wavelength	-	nm	1300 - 1324
Zero Dispersion Slope	-	ps/(nm2·km)	≤ 0.092
Dispersion	1550nm	ps/(nm·km)	13.3 - 18.6
Dispersion	1625nm	ps/(nm·km)	17.2 - 23.7
Polarization Mode Dispersion	-	ps/√km	≤ 0.2
Cut-off Wavelength λcc-Cable	-	nm	≤ 1260
Mode Field Diameter (MFD)	1310nm	μm	8.6±0.4
Mode Field Diameter (MFD)	1550nm	μm	9.6±0.5

Attenuation Discontinuity	1310nm	dB	≤ 0.03
	1550nm	dB	≤ 0.05
Geometrical
Cladding Diameter		μm	125±0.7
Cladding Non-Circularity		%	≤ 0.8
Core/Cladding Concentricity Error		μm	≤ 0.5
Coating Diameter (Uncolored)		μm	235-255	190-210
Coating/Cladding Concentricity Error		μm	≤ 12.5	≤ 10
Curl		m	≥ 4
Environmental (1550nm, 1625nm)
Temperature Cycling	-60℃ to +85℃	dB/km	≤ 0.05
High Temperature & High Humidity	85℃, 85% RH, 30days	dB/km	≤ 0.05
Water Immersion	23℃, 30days	dB/km	≤ 0.05
High Temperature Aging	85℃, 30days	dB/km	≤ 0.05
Mechanical
Proof Stress	-	GPa	0.69
		kpsi	100
Coating Strip Force *	Peak	N	1.3 - 8.9
	Average	N	1.0 - 5.0
Tensile Strength	Fk=50%	GPa	≥ 4.00
	Fk= 15%	GPa	≥ 3.20
Dynamic Fatigue (Nd)	-	-	≥ 20
Macrobending Loss
Ø30 mm×10 t	1550nm	dB	≤ 0.03
	1625nm	dB	≤ 0. 1
Ø20 mm×1 t	1550nm	dB	≤ 0. 1
	1625nm	dB	≤ 0.2
Ø15 mm×1 t	1550nm	dB	≤ 0.4
	1625nm	dB	≤ 0.8
* When the coating diameter is 200±10, the peak peeling force of the coating is 0.6-8.9N, and the average is 0.6-5.0N.