How Optical Circuit Switching Transforms Lawful Intercept and Network Monitoring

Dave McKibben, VP Sales Industry for POLATIS® Worldwide.

Ever-increasing data rates and traffic volumes are pushing lawful intercept and intelligence monitoring systems to their limits. The challenge is no longer whether traffic can be accessed, but how to monitor it cost‑effectively - especially as monitoring points span submarine cable landing stations, carrier facilities, internet exchanges and data centers, sometimes in remote or unmanned locations.

In many deployments, hundreds or thousands of fibers may need monitoring, with each fiber carrying vast amounts of traffic and a mix of formats, wavelengths, protocols and encryption. While advanced analysis and collection tools can extract signals of interest at line rate, applying them to every line is often cost prohibitive, particularly at 100 Gbps and higher.

The architecture shift: preselect, then analyze

A more efficient approach is to use a lower-cost front end to preselect which fibers are forwarded to expensive tools. This is where optical circuit switching plays a central role.

An optical circuit switch (OCS) can sit between network taps and monitoring tools, dynamically routing fibers on an as-needed basis. Because it is signal agnostic (independent of wavelength, protocol, or data rate), it provides a future‑proof front end even as underlying transport evolves. MS mirrors, liquid crystal or silicon photonics to steer light paths in a non-blocking, scalable manner.

Reducing cost at higher speeds: linking Packet Brokers and OCS

Packet brokers are often used to groom traffic for analysis tools, but their cost per port rises dramatically as data rates move to 100G, 400G and beyond. Placing an optical circuit switch between line taps and a reduced set of packet broker ports can reduce overall system cost while balancing visibility.

Why POLATIS is highlighted for mission‑critical monitoring

As the preselect element, the optical circuit switch becomes a mission‑critical component. Key benefits of HUBER+SUHNER POLATIS switches include:

Low insertion loss (typical 0.6 dB up to 96x96) to preserve weak tapped signals
Non‑blocking architectures and large scale (matrix sizes from 8x8 up to 384x384, plus asymmetric options)
Fast switching (25–75 ms, matrix‑size dependent) for rapid cycling through feeds
True dark fiber switching (no light required to make/hold connections)
Optional integrated Optical Power Monitors to measure the signal’s optical power
Optional Variable Optical Attenuation (VOA) for managing power levels in order to protect sensitive receivers
Broad management interfaces including TL1, SCPI, SNMP, NETCONF and RESTCONF
Resilience features such as dual redundant, hot‑swappable network interface cards and power supplies
Manufactured and supplied from a friendly country sourced 100% from within Europe
Over 25 years' experience of supplying to government agencies around the globe

Conclusion

Optical circuit switching enables a pragmatic monitoring model: survey broadly, switch intelligently, and reserve expensive line‑rate tools for the fibers that matter most -delivering scalable visibility without linear cost growth as data rates and traffic volumes increase.