Description

Features
High thermal stability of parameters
Low insertion loss and polarization loss
High channel isolation

Applications
Telecommunication networks
Bidirectional WDM systems
CATV networks

Technical parameters
EXAMPLES OF TECHNICAL SPECIFICATION FOR TYPICAL FWDM FILTERS
Type Unit 1310/1550 nm 1480/1550 nm 1550/1310 & 1490 nm
Transmission port bandwidth nm 1260-1360 (1520-1600) 1440-1490 (1530-1580) 1550-1600
Reflection port bandwidth nm 1260-1360 (1520-1600) 1530-1580 (1440-1490) 1260-1360 & 1460-1500
Transmission port IL dB ≤0.6 ≤0.6 ≤0.6
Reflection port IL dB ≤0.5 ≤0.5 ≤0.5
Transmission port isol. dB > 30 > 30 > 30
Reflection port isol. dB > 15 > 15 > 20
PDl dB 0.10 0.10 0.15
PMD ps 0.10 0.10 0.10
Directivity dB ≥ 50 ≥ 50 ≥ 50
RL dB ≥ 50 ≥ 50 ≥ 50
Thermal stability dB/ °C 0.005 0.005 0.005
Storage temperature °C -40 do +85 -40 do +85 -40 do +85
Operating temperature °C -20 do +70 -20 do +70 -20 do +70
Fiber type SM 09/125 G.652D SM 09/125 G.652D SM 09/125 G.652D
Max. optical power mW 300 300 300
Casings

250 μm output fibers: Ø34×5.5 mm
Output fibers in 900 μm coating: Ø38×5.5 mm
Output fibers in 0.9/2.0/3.0 mm coating: blackbox 90x20x10 mm

Fibrain family of FWDM solutions (Filter-based WDM) is based on TFF (Thin Film Filter) technology. Products made using this technology have high channel isolation, thermal stability, and low attenuation. Versions with raised isolation in both channels are also available. These devices are designed for separation or addition of optical signals transmitted at different wavelengths.

WDM filters are widely used in passive optical networks due to the possibility of adding and transferring signals at different wavelengths. Nowadays, 1550 nm, 1490 nm, and 1310 nm wavelengths are the most popular in modern FTTH networks.

Besides standard products, we also offer the following filters:

Multimode, 850/1300 nm, 980/1550 nm
Single mode, 1310/1480 nm, 1510/1550 nm
Triplexers, FTTx/OTDR, and FTTx&CATV/OTDR
Other filters for CATV applications
With raised isolation (>45 dB for all ports)