Products

TFO LightBend? (G.657.A1)

Based on the optimum RIP design, TFO LightBend^? fibre is a full spectrum fibre with zero water peak, low

attenuation and excellent uniformity, low chromatic dispersion and PMD, excellent macrobending loss at

minimum radius 10mm, superior and stable geometrical size control level, this full spectrum fibre is

applicable to transmission system operating over the entire wavelength from 1260nm to 1625nm.

TFO LightBend^? fibre meets or exceeds the ITU-T Recommendation G.657.A1 and IEC 60793-2-50 type 6.a1

Optical Fiber Specification. With the same mode field diameter as standard single mode fibre, this makes

TFO LightBend^? fibre fully compatible with traditional ITU-T G.652.D and IEC 60793-2-50 type B1.3 fibre

and widely used in all types of optical cables.

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Introduction

TFO LightBend^?(G.657.A1)

Characteristics

Conditions

Parameters

Unit

Optical properties

Attenuation Coefficient

1310 nm

≤ 0.34

dB/km

1285-1330 nm

≤ 0.37

dB/km

1383 nm（after hydrogen aging）

≤ 0.31

dB/km

1490 nm

≤ 0.23

dB/km

1550 nm

≤ 0.20

dB/km

1525 - 1575 nm

≤ 0.21

dB/km

1625 nm

≤ 0.22

dB/km

Mode Field Diameter(MFD)

1310 nm

9.0 ± 0.3

?m

1550 nm

10.2 ± 0.4

?m

Cut-Off Wavelength

Cable Cut-Off

≤ 1260

nm

Chromatic Dispersion

Zero Dispersion Wavelength

1300 - 1324

nm

Zero Dispersion Slope

≤ 0.090

ps/nm²/km

Dispersion Coefficient

1285 - 1339 nm

≤ |3|

ps/nm/km

1550 nm

≤ 17

ps/nm/km

1625 nm

≤ 21

ps/nm/km

Polarisation Mode Dispersion

PMD Coefficient

Uncabled fibre

≤ 0.10

ps/√km

PMD link design value

≤ 0.06

ps/√km

Point Discontinuity

1310 nm

≤ 0.05

dB

1550 nm

≤ 0.05

dB

Effective Group Refractive Index

1310 nm

1.4671

1550 nm

1.4675

1625 nm

1.4680

Geometrical Properties

Core Non-circularity

≤ 6

%

Cladding Diameter

125.0 ± 0.5

?m

Core/Cladding Concentricity Error

≤ 0.4

?m

Cladding Non-Circularity

≤ 0.6

%

Coating Diameter

242 ± 5

?m

Coating/Cladding Concentricity Error

≤ 8

?m

Mechanical properties

Proof Test

Fibre strain

≥ 1

%

Fibre load

≥ 9

N

Stress

≥ 100

kpsi

Dynamic Stress Corrosion Susceptibility Factor n_d

Unaged

≥ 20

Aged（30 days @ 85℃, 85% R.H.）

≥ 20

Macro Bending Sensitivity

10 turns of 15 mm radius, 1550nm

≤ 0.25

dB

10 turns of 15 mm radius, 1625 nm

≤ 1.0

dB

1 turns of 10 mm radius, 1550 nm

≤ 0.75

dB

1 turns of 10 mm radius, 1625 nm

≤ 1.5

dB

Coating Strip Force

Peak value

1.3 - 8.9

N

Fibre Curl

≥ 4

m

Environmental Properties

Accelerated Ageing（30days @ 85℃ 85% R.H.）

Induced attenuation（1310 and 1550 nm）

≤ 0.05

dB/km

Dry heat aging（30days @ 85℃）

Induced attenuation（1310 and 1550 nm）

≤ 0.05

dB/km

Temperature Cycling （-60℃- +85℃）

Induced attenuation（1310 and 1550 nm）

≤ 0.05

dB/km

Water Soak（30 days @ 23℃）

Induced attenuation（1310 and 1550 nm）

≤ 0.05

dB/km

TFO LightBend^?(G.657.A1)
Characteristics	Conditions	Parameters	Unit
Optical properties
Attenuation Coefficient	1310 nm	≤ 0.34	dB/km
	1285-1330 nm	≤ 0.37	dB/km
	1383 nm（after hydrogen aging）	≤ 0.31	dB/km
	1490 nm	≤ 0.23	dB/km
	1550 nm	≤ 0.20	dB/km
	1525 - 1575 nm	≤ 0.21	dB/km
	1625 nm	≤ 0.22	dB/km
Mode Field Diameter(MFD)	1310 nm	9.0 ± 0.3	?m
Mode Field Diameter(MFD)	1550 nm	10.2 ± 0.4	?m
Cut-Off Wavelength
Cable Cut-Off		≤ 1260	nm
Chromatic Dispersion
Zero Dispersion Wavelength		1300 - 1324	nm
Zero Dispersion Slope		≤ 0.090	ps/nm²/km
Dispersion Coefficient	1285 - 1339 nm	≤ \|3\|	ps/nm/km
	1550 nm	≤ 17	ps/nm/km
	1625 nm	≤ 21	ps/nm/km
Polarisation Mode Dispersion
PMD Coefficient	Uncabled fibre	≤ 0.10	ps/√km
PMD Coefficient	PMD link design value	≤ 0.06	ps/√km
Point Discontinuity	1310 nm	≤ 0.05	dB
Point Discontinuity	1550 nm	≤ 0.05	dB
Effective Group Refractive Index	1310 nm	1.4671
	1550 nm	1.4675
	1625 nm	1.4680
Geometrical Properties
Core Non-circularity		≤ 6	%
Cladding Diameter		125.0 ± 0.5	?m
Core/Cladding Concentricity Error		≤ 0.4	?m
Cladding Non-Circularity		≤ 0.6	%
Coating Diameter		242 ± 5	?m
Coating/Cladding Concentricity Error		≤ 8	?m
Mechanical properties
Proof Test	Fibre strain	≥ 1	%
	Fibre load	≥ 9	N
	Stress	≥ 100	kpsi
Dynamic Stress Corrosion Susceptibility Factor n_d	Unaged	≥ 20
Dynamic Stress Corrosion Susceptibility Factor n_d	Aged（30 days @ 85℃, 85% R.H.）	≥ 20
Macro Bending Sensitivity	10 turns of 15 mm radius, 1550nm	≤ 0.25	dB
	10 turns of 15 mm radius, 1625 nm	≤ 1.0	dB
	1 turns of 10 mm radius, 1550 nm	≤ 0.75	dB
	1 turns of 10 mm radius, 1625 nm	≤ 1.5	dB
Coating Strip Force	Peak value	1.3 - 8.9	N
Fibre Curl		≥ 4	m
Environmental Properties
Accelerated Ageing（30days @ 85℃ 85% R.H.）	Induced attenuation（1310 and 1550 nm）	≤ 0.05	dB/km
Dry heat aging（30days @ 85℃）	Induced attenuation（1310 and 1550 nm）	≤ 0.05	dB/km
Temperature Cycling （-60℃- +85℃）	Induced attenuation（1310 and 1550 nm）	≤ 0.05	dB/km
Water Soak（30 days @ 23℃）	Induced attenuation（1310 and 1550 nm）	≤ 0.05	dB/km