FBT Coupler

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

T&S Communication manufacture and provide a wide breadth of FBT couplers, which includes SM standard coupler, dual-window coupler, three-window coupler, wideband coupler with low insertion loss and high performances. The FBT couplers are available with coupling ration ranging from 1:99 to 50:50. Customized specifications are basically available.

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.

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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