C band DWDM Red/Blue Filter WDM device 3 Port Thin Film Filter FWDM
3 Port C band DWDM Red/Blue Filter WDM device
GEZHI DWDM Red/Blue filter is a thin-film filter device. It is a
three-port device. One port is called the "Common." The other two
ports provide the conduit for the two wavelength "bands."
The two bands are the Red (λ>1547 nm) and the Blue (λ<1543
nm) .
One band goes thru the Reflected leg, and the other band goes thru
the Pass leg.
Typically, however, the device is used as a two-way (i.e.
bidirectional) WDM. One band is sent to the Common leg, while the
other band is delivered from the Common leg. (see example
diagram)In a DWDM module, which uses a Red/Blue filter, a Mux may
be combined with a Demux.
For example, the Mux combines DWDM channels in the Red band, while
the Demux separates DWDM channels in the Blue Band. Using a Red /
Blue fillter, one can combine the Red Transmit channels and the
Blue Receive channels onto a single fiber. | 
Example of a Red/Blue WDM in bi-directional usage. |
Features Application
Ø Low Insertion Loss Ø WDM Network
Ø Wide Pass Band Ø Line Monitoring
Ø High Channel Isolation Ø Telecommunication
Ø High Reliability Ø Testing Instruments
DWDM Red/Blue Band Filter DWDM Red/Blue Band Filter DWDM Red/Blue
Band Filter with
with Stainless steel tube with Plastic ASB box Package 19" 1RU Rack
mount package
Performance Specifications
| Type | FWDM |
| Pass Channel Wavelength | nm | 1547~1561 (Red) | 1530~1543.2 (Blue) |
| Reflection channel Wavelength | nm | 1530~154.2 (Blue) | 1547~1561 (Red) |
| Pass Channel insertion loss | dB | ≤0.60 |
| Reflection Channel insertion loss | dB | ≤0.40 |
| Channel Ripple | dB | ≤0.3 |
| Adjacent channel isolation | dB | ≥30 |
| Express channel isolation | dB | ≥12 |
| PDL | dB | ≤0.1 |
| PMD | Ps/nm | ≤0.1 |
| Directivity | dB | ≥55 |
| Return loss | dB | ≥50 |
| Power Handling | mW | 300 |
| Operating temperature | ℃ | -5~+70 |
| Storage temperature | ℃ | -40~+85 |
| Package Dimensions | mm | φ5.5x34 |
Note: 1. Customization is available.
2. Insertion loss does not include connector, each connector will
add 0.2dB loss.
3. Other wavelength can be made upon customer’s request. For
example, L-Band R/B, C/L Band.
Ordering Information
| Wavelength | Package Spec | Fiber Type | Fiber Diameter | Fiber Length | Connector |
| R/B=Red/Blue Wavelength | 1= Φ5.5mm×34mm 2= 90×20×10 mm 3=100×80×10.5 mm 4= 120×80×18 mm 5=140×115×18 mm 6=19”1U Rackmount X= Others | 9=9/125 X=Others | 25=250um 90=900um 20=2.0mm 30=3.0mm X=Others | 05=0.5m 10=1.0m 15=1.5m X=Others | OO=None FP=FC/PC FA=FC/APC SP=SC/PC SA=SC/APC STP=ST/PC STA=ST/APC LP=LC/PC LA=LC/APC X=Others |
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