Fused Biconic Taper (FBT) coupler, also be called FBT splitter, based on the traditional technology, it is to bundle to- gether two or more optical fibers, and then pull the cone machine melt stretching, and real-time monitoring the change of the ratio, spectral ratio requirements after melt stretching, one side retain a single fiber (the rest of the cut) as input, the other end is a multi-channel output.
As one of the key components for GPON FTTx networks, optical splitters can be placed in the Central Office or in one of the distribution points (outdoor or indoor) because the FBT coupler are highly stable for multiport optical signal splitting with low insertion loss. FBT couplers are designed for power splitting and tapping in telecommunication equipment, CATV network, and test equipment
Features:
Low insertion loss
Low polarization dependent loss
High Return Loss Optional
Split Ratio 20/80, 40/60. (50/50 as default.)
Compact for small application areas like in closure or splice trays
Wide Operating Temperature and Wavelength
Excellent Environmental & Mechanical Stability
Application:
FTTX (FTTP, FTTH, FTTN, FTTC)
Passive Optical Networks (PON)
Local Area Networks (LAN)
CATV Systems Amplifying,
Monitoring System
Specification:
Single Standard Couplers | ||
Grade | P Grade | A Grade |
Coupling Ratio（%） | 50/50 | 50/50 |
Excess Loss (Typical)（dB） | 0.07 | 0.1 |
Maximum insertion loss（dB） | 3.4 | 3.5 |
Polarization Sensitivity (dB) | 0.15 | 0.2 |
Operating Wavelength（nm） | 1310,1480,1550 or custom wavelength | |
Single Wideband Couplers | ||
Grade | P Grade | A Grade |
Coupling Ratio（%） | 50/50 | 50/50 |
Excess Loss (Typical)（dB） | 0.07 | 0.1 |
Maximum lnsertion loss（dB） | 3.4 | 3.6 |
Polarization Sensitivity (dB) | 0.15 | 0.2 |
Operating Wavelength（nm） | 1310±40,1550±40,or custom wavelength | |
Coupling Ratio（%） | 1~50 | |
Directivity (dB) | ≥55 | |
Operating Temperature(℃) | -20~+80 | |
Storage Temperature(℃) | -40~+85 | |
Fiber Type | SMF-28 | |
Fiber Pigtail Length（m） | 1 | |
Port Configuration | 1×2 or 2×2 | |
Dimensions (mm) | Package D,E,F,G | |
Coupling Ratio/insertion Loss Conversion Chart
Coupling Ratio | Insertion Loss | |
Quality Level | P Grade | A Grade |
40/60 | 4.4/2.5 | 4.6/2.8 |
30/70 | 5.6/1.8 | 6.0/2.0 |
20/80 | 7.4/1.1 | 7.7/1.3 |
10/90 | 10.8/0.6 | 11.6/0.8 |
5/95 | 14.2/0.4 | 14.6/0.5 |
2/98 | 18.5/0.2 | 19.0/0.3 |
1/99 | 21.0/0.2 | 21.5/0.3 |
*Measured under the stable mode condition with LED light source.
Package Dimensions & Pigtail Style
Package Dimensions: | |
Package D： | 3mm x 45mm stainless steel tube |
Package E： | 3mm x 54mm stainless steel tube |
Package F： | 3mm x 60mm stainless steel tube |
Package G： | 10mm x 20mm x 90mm ABS cassette |
Package H： | 10mm x 80mm x 100mm ABS cassette |
Package I： | 18mm x 80mm x 120mm ABS cassette |
Package J： | 18mm x 115mm x 140mm ABS cassette |
Pigtail Style: | |
Package D,E： | 250um bare fiber |
Package F | 250um bare fiber or 900um loose tube |
Package G,H,I,J： | 2mm,3mm cable or 900um loose tube |
The relation picture of Insertion Loss & Wavelength、Temperature
