CWDM filters and modules in Pipe / ABS housing

Fibrain family of CWDM solutions (Coarse Wavelength Division Multiplexing), based on TFF (Thin Film Filter) technology, incudes OADM devices and MUX/DMUX modules. The series of CWMD devices has a high interchannel isolation, low attenuation, and a flat passband profile. They are available in an outdoor version designed to withstand temperatures in the -40/+85 °C range, also in hermetic housings. These devices are designed for multiplexing of existing fiber optic paths.

OADM devices (Optical Add/Drop Multiplexers) are used for separating (DROP) and adding (ADD) chosen channels without terminating the other, transit channels in the link. By using OADMs, it is possible to connect CWDM systems into a point-to-multipoint or ring topology. Unlike the classical MUX/DMUX module, the OADM has two linear interfaces (marked as east and west) and from two to eight local interfaces, which allows for building more complicated topologies.

MUX/DMUX modules built into terminals are used for multiplexing existing fiber optic links. They decrease the number of components in a link since they eliminate the need to install new fiber optic cables. They are most often used in 4-, 8-, and 16-channel versions with the possibilities of upgrading with additional functions.

CCWDM devices (Compact CWDM) are appliances that have smaller dimensions and ultra-low insertion losses comparing to traditional CWDM filters. They are recommended mostly for applications with extremely tight power budget.

CWDM transmission is often used in metro networks, where the signal quality is extremely important and the operators cannot be at risk at lowering it. This is why all Fibrain CWDM components are measured in all spectral range and delivered with reports that show the whole spectral profile, so the values of attenuation and isolation given in the report are always “worst case.”

Features

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

Applications

  • ADD/DROP solutions
  • CWDM systems
  • Optical amplifiers
  • Telecommunication networks
  • CATV networks

Technical parameters

Technical data of CWDM filters ADD or DROP

Type1271,1291,..1451nm or 1270, 1290,..1450
Interchannel space [nm]20
Channel width [nm]c+/-6.5
Reflection bandwidth [nm]1260-1610
Pass bandwidth @ -0.5dB14
Pass Channel flatness [dB]0.3
Pass insertion loss [dB]0.8
Reflection insertion loss [dB]0.6
Adjacent channel isolation [dB]30
Non-adjacent channel isolation [dB]40
Reflection Channel Isolation [dB]15
Directivity [dB]55
Return loss [dB]50
PDL [dB]0.1
Bandwidth temerature stability0.003 nm/ °C
Attenuation temperature stability0.005 dB/ °C
Power handling [mW]500
Operating temperature-5 °C to +70° C
Storage temerature-40 °C to +85 °C
Type4 channels8 channels16 channels
Attenuation [dB]2.03.54.5
Wavelength [nm]1270, 1290,1310,..1610 or 1271, 1291, 1311..16111270, 1290,1310,..1610 or 1271, 1291, 1311..16111270, 1290,1310,..1610 or 1271, 1291, 1311..1611
Interchannel space [nm]202020
Channel width [nm]c+/-6.5c+/-6.5c+/-6.5
Channel flatness [dB]0.40.40.4
Channel uniformity [dB]1.01.01.0
Adjacent channel isolation [dB]303030
Non-adjacent ch. isolation [dB]404040
Directivity [dB]555555
Return loss [dB]505050
PDL [dB]0.150.150.2
PMD [ps]0.10.10.15
Bandwidth temperature stability0.003 nm/ °C0.003 nm/ °C0.003 nm/ °C
Attenuation temp. stability0.005 dB/ °C0.005 dB/ °C0.005 dB/ °C
Power handling [mW]500500500
Operating temperature-5 °C to +70 °C-5 °C to +70 °C-5 °C to +70 °C
Storage temperature-40 °C to +85 °C-40 °C to +85 °C-40 °C to +85 °C
Type4 channels8 channels18 channels
Attenuation [dB]1.61.81.8 type (2.5 max)
Wavelength [nm]1270, 1290,1310,..1610 or 1271, 1291, 1311..1611 1270, 1290,1310,..1610 or 1271, 1291, 1311..1611 1270, 1290,1310,..1610 or 1271, 1291, 1311..1611
Interchannel space [nm]202020
Channel width [nm]c+/-6.5c+/-6.5c+/-6.5
Test port1310 m +/-50 nm1310 m +/-50 nm
Monitor port1/99%1/99%
Channel flatness [dB]0.40.4
Upgrade port1260–1457 nm or 1460–1610 nm IL 1.2 dB 1260–1457 nm or 1460–1610 nm IL 1.2 dB
Isolation MUX Adjacent Channel [dB]303030
Isolatio MUX Non-adjacent Channel [dB]404040
Isolation DMUX Adjacent Channel [dB]303030
Isolation DMUX Non-adjacent Channel [dB]404040
Isolatio Upgrade port [dB]151515
Ripple in Passband [dB]0.30.30.5
Directivity [dB]555555
Return loss [dB]454545
PDL [dB]0.150.150.2
PMD [ps]0.10.10.1
Bandwidth temperature stability0.003 nm/ °C0.003 nm/ °C0.003 nm/ °C
Attenuation temperature stability0.005 dB/ °C0.005 dB/ °C0.005 dB/ °C
Power handling [mW]500500300
Operating temperature-10 °C to +70 °C-10 °C to +70 °C0 °C to +70 °C
Storage temerature-40 °C to +85 °C-40 °C to +85 °C-40 °C to +85 °C
Fiber type250 um or 900 um SM G.652D250 um or 900 um SM G.652D250 um or 900 um SM G.652D

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