1-channel add&drop C/DWDM multiplexer

1-channel add drop C DWDM multiplexer

The SPEED-AD-xWDM is a compact cost-effective optimised add&drop multiplexer for CWDM and DWDM applications. A dedicated wavelength can be dropped out of a fibre optic link that parallel transmits multiple C/DWDM wavelengths by using an add&drop multiplexer. All incoming wavelengths are received at one of the both line ports in such a daisy-chain structure. The required wavelength/application are dropped by the so-called “drop”-client port. This in the further course unused wavelength can be connected with a new application by the so called “add”-port. The new application and the remaining, non-dropped wavelengths are conjoined transmitted to the next site by using the second line port.

Multiple use of C/DWDM wavelengths

1-channel add drop C DWDM multiplexer diagram 1

Add&drop C/DWDM in a ring: DSLAM backhauling and shift-in

Add/drop multiplexers are often used in ring structures requiring longer distances as significantly improved attenuation values can be achieved compared to standard CWDM and DWDM multiplexers. A ring structure enables to realize a backup scenario in addition to an actual transmission. This backup scenario assures the data transmission – even after a fibre break between two sites.

1-channel add drop C DWDM multiplexer diagram 2


  • Ideal for C/DWDM ring structures or daisy chains
  • Compact 1-slot module for integration in a stand-alone or 19" SPEED-CARRIER housing
  • Customized number of channels and wavelengths available
  • Optimized-to-attenuation and costs



  • Attenuation: Depending on the number of channels Using a 3-channel put-through and a 1-channel add&drop: Approx. 1dB (without connector)
  • Passive mux/demux modules without requiring power supply
    • Humidity: 0 to 95% (non-condensing)
    • Dimensions: (H x B x T): 21 x 131 x 219 mm

Line port

  • Line type: single-mode
  • Connector: LC
  • Distance: Depending on power budget of user equipment

Client port

  • 2 x single-mode
  • Wavelengths: C/DWDM on request
  • Connector: LC/PC


  • CDWM/DWDM ring structure or daisy chain
  • High-speed: ATM, SONET/SDH, Ethernet/Fast Ethernet, Gigabit Ethernet, 10 Gigabit Ethernet, Fibre Channel, FICON, ESCON etc.
  • Low-speed: n x 64 kbit/s application, Leased Lines, E1, ISDN etc.

Live Demo of FRM220 Chassis

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