RF over Fibre

PPM’s range of RF over fibre links are high performance transmission systems designed for test and measurement. Transmission of RF or DC over optical fiber enables immunity to electrical interference. Intensity modulation means the signal is transferred between the optical and electrical domains with no modulation or digitization (AC links only). Therefore the links are agnostic of signal format and can be used for any RF signal. In addition to Point2point links, the Sentinel intelligent system allows multipoint links with added functionality such as remote adjustable gain and system self-calibration. For more information, see individual products below or visit our RF over fibre FAQs page.

How it works

An RF signal applied to the input of the optical transmitter is amplified, conditioned, and converted into an optical signal for transmission over optical fibre.

  • AC links use intensity modulation to convert between the electrical and optical domains and can therefore convey data of almost any format.
  • DC links convert an analogue signal into a 14-bit digital signal before transmission. DC links allow transmission of DC and low frequency signals.

At the receiver, the signal is converted back into an electrical signal and therefore the link is transparent in any system. All modules are available with either single or multi-mode fibre interfaces for integration into existing infrastructure.

Sentinel – Intelligent Systems


S3 GUI screenshot v5


The Sentinel fibre optic link system is a world-class system designed for EMC and EMP testing. The latest platform, Sentinel 3 offers excellent sensitivity as well as time-saving features such as:

  • Remote monitoring and control of transmitter units
  • Variety of connector options for easier instrumentation setup.
  • Highly scalable, with multi-core cross-site cables allowing one single receiver to monitor up to 48 sensors.
  • Power detection
  • System self-calibration


  • EMP test and EMC conformance
  • HIRF aircraft clearance
  • Simulated lightning testing
  • Impulse, time domain and NEMP (“nemp”) testing
  • Low and high level swept frequency coupling measurements

View Sentinel 3 product page

Point2point fibre optic links


P2P transmitter 250px sq


Point2point links are fixed gain links which suit applications where advanced features such as multiple inputs and automatic gain control are not required. AC coupled links are available up to 250MHz, 1.35GHz, 2GHz and 3GHz and DC coupled links available from DC up to 2.5MHz and 40MHz.

View point2point links product page


  • EMC test chambers
  • Electrically noisy environments
  • Power distribution monitoring
  • High voltage monitoring and analysis
  • Monitoring of true DC signals
  • Signals containing very low frequency or DC
  • Long distance transmission.