Name: FBT Coupler
Brand: T&S Communication Co, Ltd.

FBT Coupler is a type of splitter which is based on fused biconical taper technology. The technology is widely accepted and adopted in the PON solution. FBT or fused biconical taper is a traditional technology that two fibers are twisted and fused together under high temperature while the device is being elongated and tapered. As a professional coupler factory, T&S provides various kinds of high-quality FBT couplers.

T&S FBT coupler offers low insertion loss, low polarization dependence and excellent environmental stability. Accurate coupling ratio from 50/50 to 1/99 and fiber type 250μm bare fiber, 3mm and 900μm loose tube fiber are available with very tight uniformity. Singlemode standard coupler and wideband coupler components find extensive application to perform power splitting and monitoring functions in all kinds of optical communication systems.

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FBT Coupler Specification Download

Features of FBT Coupler

Passed Telcordia GR-1221-CORE, and 85℃, 85％RH test up to 1500 hours
Low extra loss

Specifications of FBT Coupler

1×2 Single Mode Coupler(SMC)

1×2 Tap Coupler(WTC)

Three-Windows Couple(TWC)

1×N Monolithic Single Mode Couple(MSC)

Wavelength	nm		1310,1550,1310&1550
Bandwidth	nm		±20，±40
Coupling Ratio			50/50		40/60		20/80		10/90
Grade			P	S	P	S	P	S	P	S
Insertion Loss	dB	Max	3.4	3.6	4.4/2.6	4.6/2.8	7.5/1.2	8.0/1.3	11.0/0.65	12.0/0.8
Uniformity	dB	Max	0.5	0.7	/	/	/	/	/	/
PDL	dB	Max	0.15	0.2	0.2	0.25	0.2	0.25	0.2	0.3
Return Loss	dB		≥50
Operating Temperature	℃		-20～75

Wavelength	nm		1550 or on Request
Bandwidth	nm		±20
Coupling Ratio			1/99		2/98		5/95
Grade			P	S	P	S	P	S
Insertion Loss	dB	Max	21.5/0.22	22.0/0.3	18.5/0.25	19.5/0.35	14.0/0.4	14.8/0.5
PDL	dB	Max	0.25/0.10	0.30/0.15	0.25/0.10	0.30/0.15	0.25/0.10	0.30/0.15
Return Loss	dB		≥50
Operating Temperature	℃		-20～75

Wavelength	nm		1310&1490&1550
Bandwidth	nm		1310±40,1490±10,1550±40
Coupling Ratio			50/50		40/60		20/80		10/90
Grade			P	S	P	S	P	S	P	S
Insertion Loss	dB	Max	3.7	4	4.7/2.7	5.0/3.0	7.8/1.4	8.1/1.7	11.2/0.9	11.6/1.2
Uniformity	dB	Max	0.5	0.7	/	/	/	/	/	/
PDL	dB	Max	0.2	0.25	0.2	0.25	0.2	0.25	0.2	0.3
Return Loss	dB		≥50
Operating Temperature	℃		-20～75

Wavelength		nm		1310,1550 or on Request
Bandwidth		nm		±20
Coupling Ratio				1×3		1×4
Grade				P	S	P	S
Insertion Loss		dB	Max	5.4	5.7	7	7.4
Uniformity	Max	dB	Max	0.8	1.2	1.2	1.5
PDL	Max	dB	Max	0.2	0.3	0.2	0.3
Return Loss		dB		≥50
Operating Temperature		℃		-20～75