Optical Fused Coupler

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Pictures and Schematic Diagram

The optical fused coupler goes by names. Fused fiber coupler and FBT splitter are just a couple. The word fused indicates that the coupler is made by fusing two adjacent fibers together to form a fused biconical taper coupler.

Applications of Optical Fused Coupler
FTTH
Telecommunication Networks System
Passive telecommunication networks (PON)
CATV
fiber optic test equipment
Fiber optic sensor
LAN

Features of FBT Coupler
Low insertion loss
Low polarization loss
High directivity
High stability and reliability

Technical Specifications of Optical Fused Coupler

Parameters	Unit	Specifications
Channel Number	---	4	8	16	32
Operation Wavelength	nm	1550/1310, or on request
Coupling Ratio	---	50/50
Max. Excess Loss	dB	0.25£	0.4£	0.55£	0.7£
Insertion Loss	dB	7.1£	10.7£	13.0£	16.5£
Uniformity	Db	2.1£	8.1£	4.2£	3£
Polarization Sensitivity Loss	dB	0.2£	0.3£	0.4£	0.5£
Directivity	dB	50³
Fiber Pigtail Length (m)	m	1 m or custom length
Fiber Type	---	SMF-28e 250um fiber with 900um loose tube
H´W´Package Dimension(L	mm	10´ 80 ´100		120´80´18
Operating Temperature	℃	-20 to 70
Storage Temperature	℃	-40 to 85

Note: All insertion loss doesn’t include connector loss. For fiber optic components with connectors, the insertion loss will be 0.3 dB higher.