ROADM & Optical Channel Monitoring

By: Optelian  09-12-2011

Reconfigurable Optical Add/Drop Multiplexers (ROADMs) and Optical Channel Monitors (OCMs) are key building blocks for agile optical networks.

  • Edge and multi-degree ROADM applications
  • 100% unrestricted add/drop capability
  • Automatic power balancing
  • Remote optical power monitoring
  • 40 or 80 DWDM channels
  • Mature WSS technology
  • No calibration needed over product life

Optelian’s RDM-series ROADM modules allow network operators, working remotely, to quickly reconfigure circuits in DWDM networks. RDMs also attenuate optical power levels to ensure that they remain balanced across all DWDM wavelengths.

OCM-series optical channel monitors continuously monitor the optical power level across wavelengths in a DWDM system, eliminating the need for an Optical Spectrum Analyzer on site. Readings are reported remotely through the LightGAINONM-200 network manager.

OCM Readout
With readings from an OCM, an RDM performs automatic, per-channel optical power balancing in real time.

RDM and OCM Models

Both 2-degree and 4-degree RDM modules are available. The 4-degree RDM can be used for 2-degree applications to start with and upgraded in-service to add additional degrees. 4-degree RDMs can be configured for ROADM applications up to 16 degrees.

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Other products and services from Optelian


Amplification and Dispersion Compensation

Optical FiberAmplifiers provide the reach needed for long-haul DWDM, ROADM, and higher-loss metro OADM applications. Chromatic dispersion is predictable and stable and can be compensated for using dispersion compensation modules. Amplified DWDM systems experience accumulated delay induced by chromatic dispersion on long fiber spans. Optelian’s OFAs are gain-flattened, low-noise, C-Band Erbium-doped fiber amplifiers.


Multiplexers, Splitters and Circulators

As shown in the diagram to the right, for xWDM applications, signals from SONET/SDH, Ethernet, or other transmission equipment are converted to the required wavelengths through muxponders, transponders or SFP/XFPs used in the transmission equipment before being combined by the multiplexer.


LightGAIN Systems

An Optical Service Channel is available to pass management reports and commands through a geographically distributed network. Optical network functions and system intelligence are packaged in standard plug and play modules. Aggregate multiple low-speed signals to one high speed signal to add capacity to optical systems. Network designs are quickly and easily configured for any application.


SFPs and XFPs

A wide variety of SFPs and XFPs are available to support all kinds of applications including reach extension, wavelength conversion for CWDM and DWDM systems and for multi-mode to single-mode conversion. OEM units are available for installation in non-Optelian transmission equipment.



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Any system can be extended for an unlimited distance by adding regenerators mid-span, as the 3R function of the regenerator effectively cleans up the signal from chromatic and polarization mode dispersion. Regenerators can be used with amplifiers; amplifiers giving hundreds of kilometers of reach and regenerators placed when necessary to clean up the signal.