SINGLE MODE FIBRE SPECIFICATIONS (ITU- T G.652)

S.NO.	CHARACTERSTICS TO BE TESTED/VERIFIED	UNIT	REQUIREMENT
1.        TRANSMISSION
A	Attenuation at
	1310 nm	dB /km	<= 0.34
	1550nm	dB/km	<= 0.21
B	Spectral Attn. At
	1285-1330 nm	dB/km	<= 0.38
	1383 ± 3nm	dB/km	<= 1.0
C	Point Discontinuity	dB/km	<=0.10
D	Cut off wave length	nm	1160 -1320
E	Mode field diameter (SMMC)	µm	9.3 ± 0.5
F	Dispersion at
	1270-1340 nm	ps/nm2.km	<= 5.30
	1285-1330nm	ps/nm2.km	< =3.50
	1550	ps/nm2.km	< =18.0
	Dispersion slope	ps/nm2.km	< =0.092
	Zero dispersion wave length	nm	1300 –1324
G	PMD (1310nm & 1550nm)	ps/sqrt(Km)	<=0.2
2.        FIBRE GEOMETRY
A	Clad dia.	µm	125 ± 1.0
B	Clad non-circularity	%	< =1.0
C	Core / Clad Conc.	µm	<= 0.8
D	Coating  Diameter (UV Acrylate material)	µm	245±10
E	Coating / Clad  Conc.	µm	<= 12
3.         MECHANICAL TESTS
A	Proof test at min. strain level	%	1
B	Fibre Curl	m	>=4
C	Strippablity test  to remove secondary coating of the fibre	N	1.3<=F<=8.9
D	Dynamic Tensile Strength           Unaged                                                                                                Aged		>=550Kpsi (3.8 G.pa) >=440Kpsi   (3.00 G.pa)
E	Static Fatigue		>=20
F	Dynamic Fatigue		>=20
G	Change in Attenuation at 1550nm when fibre is coiled Nim 1 turn on 32.5+/-0.5 mm diameter mandrel (Microbend Test)	dB	<=0.5
H	Change in Attenuation measured at 1550 nm when fibre is coiled with 100 turns on 30±0.5mm radius mandrel (Macrobend Test)	dB	<=0.1
4.         ENVIRONMENT TESTS
	Induced attenuation at 1310nm & 1550 nm
A	Temp/ Cycling (-60 deg C to +85 deg C)	dB/km	<=0.05
B	Temp. Humidity Cycling 30 days ( -10 deg C to +85 deg C upto 95 % RH)	dB/km	<=0.05
C	Heat Ageing test for 30 days (85 deg C)	dB/km	<=0.05
D	Water Immersion test for 30 days (23 ± 5 deg C)	dB/km	<=0.05

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