SFT 01x02 Singlemode Couplers -

Couplers, Splitters Wavelength division multiplexers (WDM, CWDM, DWDM)

SFT 01x02 Singlemode Couplers

SFT-SWB Wavelength Independent
SFT-S35 Dual Windows Wideband
OPTOKON SFT-SWB wavelength independent couplers/splitters are designed to transmit optical signals within the full CWDM wavelength spectrum. With its innovative Fused Technology Process, the SFT series couplers have proven to provide exceptional characteristics for all applications demanding critical performance. These ultra reliable devices feature low backreflection, low insertion loss, and high port isolation over wide temperature and wavelength ranges. The SFT couplers are designed to divide and/or combine different optical signals in optical fiber systems. Splitting ratios can be customer specified between 1%:99% and 50%:50%. Various types of pigtailing and connector terminations are available to meet your requirements. Available in a wide variety of packaging configurations The OPTOKON SFT-S35 dual windows wideband series are operable in both 1310 nm and 1550 nm wavelength range.

Low insertion loss
High port isolation
Custom defined specifications
Environmentally stable
Wavelength independent - full CWDM spectrum

ITEM	Dual Window Wideband Couplers
Operating Wavelength, nm	S35: 1310 ± 40 and 1550 ± 80 SWB: 1250 – 1650 (CWDM wavelength range)
Typical Excess Loss, dB	0.2
Uniformity, dB (50:50)	≤ 0.8
Thermal Stability, dB (peak-peak)	< 0.2
PDL, dB (50:50 coupling ratio)	< 0.15
Port Configuration	1 x 2 or 2 x 2
Coupling Ratio	1:99 to 50:50, (50:50 standard)
Insertion Loss¹⁾, dB	Refer to the coupling ratio vs. Insertion loss chart
Directivity, dB	> 50
Return Loss, dB	> 50
Operating Temperature²⁾, °C	-40 to +85
Storage Temperature²⁾, °C	-50 to +85
WARNING	This product should never be installed in an optical network handling above Class I emissions

Note: 1) Without connectors
2) Conditioned by the cable type

Block diagram:

Coupling Ratio vs. Insertion Loss:		Coupling Ratio PDL Conversation Chart:
Coupling Ratio (%)	Insertion Loss (dB)	Coupling Ratio (%)	PDL (dB)
50 / 50	3.6	> 40 %	0.15
40 / 60	4.8 / 2.7	30 to 39 %	0.20
33 / 67	5.7 / 2.2	10 to 29 %	0.30
30 / 70	6.2 / 1.9	1 to 9 %	0.35
20 / 80	8.3 / 1.3
10 / 90	11.7 / 0.7
5 / 95	15.2 / 0.4
1 / 99	23.3 / 0.2

Packaging variants:


SFT-SWB-01x02-50-BFS-NC-NC	SFT-S35-01x02-50-LTS-NC-NC	SFT-S35-01x02-50-CM1-NC-NC

SFT-S35-01x02-50-CM3-NC-NC	2x SFT-S35-01x02-50-RM-NE2-NE2	SFT-S35-01X02-WM-NE2-NE2