Standard Singlemode Couplers (SSC) are passive optical devi-
ces which allow the distribution and combination of optical
signals of wavelength 1310nm, 1550nm or 1625 nm.
The couplers are manufactured on the basis of an advanced
Fused Biconcal Taper (FBT) technology to provide optimum
performance and longtime stability.
Features
■ Low insertion loss and extremely low excess loss.
■ Free choice of coupling ratio, e.g. as tap coupler with a coup-
ling ratio of 1% or as symmetrical coupler with coupling
ratio of 50%.
■ High return loss, i.e. no reflections interfering with the
transmitter in analogue systems.
■ High thermal, mechanical and enviromental stability to
meet the requirements of Telcordia GR-1209 / GR-1221.
■ Option of manufacture to customer specifications.
Applications
■ Public and private fibre-optic networks.
■ Measurement systems and test equipment.
■ Optical transmission and monitoring systems.
Models
■ Supplied in various housing sizes with bare fibre pigtails,
loose buffered tube pigtails or reinforced cable pigtails.
■ Couplers with more than two outlets are available as truely
fused components with up to four fibres or as coupler
modules.
■ All connector standard types are available.
For a list of all models including dimensional specifications
see the data sheets Coupler Models; Overview of Short and
Standard Versions.
For check lists and additional ordering information for our pro-
ducts visit our website or see separate data sheets.
For a
complete overview of components visit our website at www.foc-fo.com.
Components ►Couplers► Singlemode Couplers ►
SM Power Splitters ►
Standard- Singlemode Coupler (SSC)
For the wavelength range 1310nm, 1550nm or 1625nm
Wavelength dependence of Coupling Ratio of symmetrical
SSCs at 1310nm, 1550 nm and 1625 nm
1200 1300 1400 1500 1600 1700nm
% 100
90
80
70
60
50
40
30
20
10
0
FOC – fibre optical components GmbH
Barbara-McClintock-Str. 5 I 12489 Berlin, Germany
p +49 30 565507-0 I f +49 30 565507-19
w www.foc-fo.com I e info@foc-fo.de
Release 22.04.2020
Subject to modifications
DBE-COM-0046V004
Page 1 of 2
FOC Standard-Singlemode Couplers (SSC)
Wavelength [nm] 1310 ± 5, 1550 ± 5 or 1625 ± 5
Output port
O
1
O
2
Max. Insertion Loss [dB] with Coupling Ratio 50/50 % 3,4 3,4
60/40 % 2,5 4,3
67/33 % 2,0 5,2
70/30 % 1,8 5,6
80/20 % 1,1 7,4
90/10 % 0,6 10,6
95/05 % 0,4 13,8
99/01 % 0,2 22,9
Min. Directivity [dB] 55 for 1x 2, 60 for 2x 2
Min. Return Loss [dB] 55 for 1x 2, 60 for 2x 2
Polarisation Dependent Loss
(1,2)
[dB] typical 0,05
(1)
maximum 0.1 dB for port
O
1; maximum 0.2 dB for port
O
2, for symmetrical coupler
(2)
measured at central wavelength of wavelength range
Optical parameter for 1x 2 and 2 x 2 configurations
Wavelength [nm] 1310 ± 5, 1550 ± 5 or 1625 ± 5
Output port
O
1
O
2
O
3
Max. Insertion Loss [dB] with power splitting 90/05/05 % 0,8 17,2 17,2
80/10/10 % 1,5 12,8 12,8
70/15/15 % 2,1 10,0 10,0
60/20/20 % 2,8 8,3 8,3
50/25/25 % 3,7 7,1 7,1
40/30/30 % 4,7 6,2 6,2
33/33/33 % 5,6 5,6 5,6
30/35/35 % 6,2 5,4 5,4
20/40/40 % 8,3 4,7 4,7
10/45/45 % 12,8 4,2 4,2
Min. Directivity [dB] 55
Min. Return Loss [dB] 55
Polarisation Dependent Loss
(1,2)
[dB] typical 0,05
(1)
maximum 0.1 dB for port
O
1; maximum 0.2 dB for ports
O
2 and
O
3, for symmetrical couplers
(2)
measured at central wavelength of wavelength range
Wavelength [nm] 1310 ± 5, 1550 ± 5 or 1625 ± 5
Output port
O
1
O
2
O
3
O
4
Max. Insertion Loss [dB] with equal power splitting 7,1 7,1 7,1 7,1
Min. Directivity [dB] 55
Min. Return Loss [dB]] 55
Polarisation Dependent Loss
(1,2)
[dB] typical 0,25
(1)
maximum 0.5 dB
(2)
measured at central wavelength of wavelength range
Optical parameter for 1x 3 configurations
Optical parameter for 1x 4 configurations