FWDM Technology

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 because of the possibility to add and transfer 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)

WDM Triplexers for FTTx networks are based on TFF (thin film filters) technology. This technology is very flexible, so implementation of many additional services that increase the functionality of the FTTx network is possible. The most common applications are coupling the CATV signal at 1550 nm and additional OTDR monitoring ports at 1625 nm (or 1650 nm).

 

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

 

Applications
  • Bidirectional WDM systems
  • Telecommunication networks
  • CATV systems
Technical Data
Technical specification of example filters
Type 1310/1550nm 1480/1550nm 1550/1310
&1490 nm
Transmission port bandwidth [nm] 1260-1360 
(1520-1600)
1440-1490 
(1530-1580)
1550-1600
Reflection port bandwidth [nm] 1520-1600
(1260-1360)
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
Refl. port isol. [dB] > 15 > 15 >20
PDL [dB] 0.10 0.15
PMD [ps] 0.10
Directivity [dB] ≥ 50
RL  [dB] ≥ 50
Thermal stability  0.005 dB/0C
Storage temperature -400C to +850C
Operating temperature -200C to +700C
Fiber type SM 09/125 G.652D
Max. power [mW] 300

Notice: Parameters listed in the table refer to components without connector terminations.

Casings
  • 250 μm output fibers: Ø34x5.5 mm
  • Output fibers in 900 μm coating: Ø38x5.5 mm
  • Output fibers in 0.9/2.0/3.0 mm coating: blackbox 90x20x10 mm