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G.657A1

G.657 A1 is an optical fiber optimized from the G.652.D standard single-mode fiber. Its most significant improvement is its extremely strong bending resistance. It is fully compatible with the most commonly used G.652.D fiber and solves the problem of excessive signal loss caused by tight bending in FTTH and other scenarios.

Specification

Resources

Product Description

Bending insensitive single-mode optical fiber (G.657.A1) bears the entire characteristics of dispersion unshifted single-mode optical fiber and superior bending performance especially. It is applicable to transmission over entire wavelength from 1260nm to 1625nm. Under the condition of long wave band, the bending radius could be as little as 10mm.

Product Standard

ITU-T recommendation G.652.D/G.657.A1

IEC 60793-2-50 B1.3/B6.a1 optical fiber specifications.

Product Characteristics

It completely overcomes the attenuation of water peak at 1383nm and could operate over the entire wavelength from 1260nm to 1625nm.Good bending loss, applicable to occasion with special requirement of bending radius. Completely compatible with existing G.652.D. Accurate geometrical parameters ensure low splicing loss and high splicing efficiency. Excellent PMD performance supports high-speed and long repeater spacing transmission system.

Optical Characteristics

Characteristics		Units	Value
Attenuation	1310nm 1383nm 1550nm 1625nm	dB/km dB/km dB/km dB/km	≤0.35 ≤0.35 ≤0.21 ≤0.24
Attenuation vs. Wavelength	1285-1330nm vs.1310nm 1525-1575nm vs 1550nm	dB/km	≤0.04 ≤0.03
Attenuation Discontinuity	1310nm dB ≤0.05 1550nm	dB	≤0.05 ≤0.05
Attenuation Nonuniformity	1310nm dB ≤0.05 1550nm	dB/km	≤0.05 ≤0.05
Attenuation of bidirectional differential	1310nm dB ≤0.05 1550nm	dB/km	≤0.05 ≤0.05
Zero Dispersion Wavelength		nm	1300-1324
Zero Dispersion Slope		ps/(nm2.km)	≤0.092
Maximum PMD of Individual Fiber		ps/(km^1/2)	≤0.2
Cable Cutoff Wavelength λcc		nm	≤1260
Effective Group Refraction Index	1310nm 1550nm		1.467 1.468
Mode Field Diameter	1310nm	μm	8.6±0.4

Geometrical Characteristics

Characteristics		Units	Value
Cladding Diameter		um	125±0.7
Core-Cladding Concentricity Error		um	≤0.5
Cladding Non-Circularity		%	≤1.0
Coating Diameter		um	245±10
Coating Non-Circularity		%	≤4
Coating/cladding concentricity deviation		um	≤12.5
Warpage		m	≥4
Environmental Characteristics（1310nm、1550nm、1625nm）
Characteristics		Units	Value
Temperature cycling additional decay	－60℃～+85℃	dB/km	≤0.05
Additional Attenuation due to damp heat aging	85℃，RH85%，30 days	dB/km	≤0.05
Additional Attenuation due to water immersion aging	23℃，30 days	dB/km	≤0.05
Additional Attenuation due to dry heat aging	85℃，30 days	dB/km	≤0.05

Mechanical Characteristics

Characteristics		Units	Value
Tensile Proof Test		N % Kpsi	≥9.0 ≥1.0 ≥100
Coating mechanical peel force	Peak Force Typical Value	N	1.0-8.9 1.0-5.0
Tensile Strength	Weibull Distribution 50% Weibull Distribution 15%	Gpa	≥4.00 ≥3.20
Dynamic Fatigue Parameter			≥20
Macro bending additional loss
15mm radius, 10 turns	1550nm 1625nm	dB	≤0.25 ≤1.0
10mm radius, 1 turn	1550nm 1625nm	dB	≤0.75 ≤1.50

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Resources

G.657A1