FBT Couplers & Splitters

1×3 / 1×4 FBT Coupler

Fused biconical taper couplers in 1×3, 3×3 and 1×4 dual-window and single-window configurations.

Types	1×3 dual-window, 3×3 single-window, 1×4 dual-window
Operating Wavelength	1310/1550 nm; 1310 or 1550 nm
Operating Bandwidth	1310/1550 ±40 nm; ±20 nm
Insertion Loss	≤5.8 dB (1×3); ≤6.0 dB (3×3); ≤7.3 dB (1×4)
Polarization Dependent Loss	≤0.25 dB (1×3 and 1×4); ≤0.3 dB (3×3)
Uniformity	≤1.0 dB (1×3); ≤1.2 dB (3×3); ≤1.5 dB (1×4)
Temperature Dependent Loss	≤0.25 dB
Return Loss	≥55 dB
Operating Temperature	-40 to +85 °C
Storage Temperature	-40 to +85 °C
Fiber Type	SMF-28e; SMF-28e/BI 1015-A/RC-80 (3×3)
Package Dimensions	3 × 60 mm, 3 × 54 mm, 3 × 40 mm

FBT Fiber Coupler

1×2 fused fiber coupler in Premium and A grades with insertion loss from 0.3 dB, for telecom and CATV networks.

Port Configuration	1 × 2
Operating Wavelength	1310/1550 ±15 nm
Maximum Insertion Loss	≤0.3 dB (Premium); ≤0.5 dB (A Grade)
Isolation (typical)	>17 dB (Premium); >16 dB (A Grade)
Return Loss	>55 dB
Directivity	>55 dB
Polarization Dependent Loss	<0.1 dB
Storage Temperature	-40 to 85 °C
Fiber Type	SMF-28
Package Dimensions	Package A, B, C and S
Grades	P-grade (Premium) and A-grade

1×2 980/1550 WDM

Pump/signal combiner WDM for 980 nm pump and 1527–1566 nm signal, GR-1209 and GR-1221 compliant.

Signal Working Wavelength Range	1527–1566 nm
Pump Working Wavelength Range	960–990 nm
Insertion Loss (signal to common)	0.20 dB max
Insertion Loss (pump to common)	0.15 dB max
Isolation (signal to common at pump)	20 dB min
Isolation (pump to common at signal)	18 dB min
Wavelength Dependent Loss at signal	0.10 dB max
Temperature Dependent Loss	0.1 dB max
Polarization Dependent Loss	0.05 dB max
Directivity	55 dB min
Operating Temperature	-5 to 75 °C
Storage Temperature	-40 to 85 °C
Maximum Optical Power	1 W
Operating Humidity	5% to 95%
Reliability	Compliant with GR-1209-CORE and GR-1221-CORE

Special WDM & Raman Pump Combiner

Special wavelength WDMs at 980/1064, 1064/1550 and 1550/1625 nm, plus Raman pump combiners.

Operating Wavelengths	980/1064 nm, 1064/1550 nm, 1550/1625 nm
Operating Bandwidth	±5 nm (980/1064 and 1550/1625); ±15 nm (1064/1550)
Insertion Loss	≤0.3 dB (P grade); ≤0.4 dB (A grade)
Isolation (980/1064)	≥14 dB (P); ≥13 dB (A)
Isolation (1064/1550)	≥18 dB (P); ≥17 dB (A)
Isolation (1550/1625)	≥14 dB (P); ≥13 dB (A)
Polarization Dependent Loss	≤0.10 dB (P); ≤0.15 dB (A)
Directivity	≥55 dB
Operating Temperature	-40 to +85 °C
Raman Combiner Insertion Loss (15–20 nm)	≤0.5 dB (P); ≤0.6 dB (A)
Raman Combiner Insertion Loss (>20 nm)	≤0.4 dB (P); ≤0.5 dB (A)
Raman Combiner Centre Isolation	≥14 dB
Raman Combiner Directivity	≥55 dB