Photonic RF Filtering

 
RF filtering is a basic function that is used on-board in all satellites. In the course of the ESA ARTES-1 activity "Next Generation Telecom Payloads based on Photonic Technologies" several photonic building blocks for future telecom payloads have been investigated. Among those the photonic filtering of RF signals has been assessed as having a low maturity level and in need of further investigation through a proof-of-concept demonstration. "Photonic RF filtering" could be considered for such  payloads if it proves that it can offer "central frequency tuneability and passband BW adjustability" . Today commercial tuneable filters as such do not exist though it would be of tremendous interest for future flexible telecom payloads. The present ITT addresses this recommendation.

Objective(s)
The objective of this activity is to assess the practical feasibility of flexible photonic RF filtering and its suitability for future telecom payloads by designing, manufacturing and testing a proof-of-concept (TRL3) demonstrator.

Achievements and status
The activity demonstrated a Photonic RF Filter arrangement that was capable of tuning the central frequency by 2 GHz and adapting the passband from 36MHz to 54 MHz to 72 MHz to 170 MHz. The arrangement fulfilled or was very close to the technical specifications of the filter as outlined the SoW providing confidence that further development can lead to full compliance.

Benefits
The main benefit of this technology is in providing flexibility in allocation of spectra resources in Telecom Payloads by adjusting the pass-band and tuning the central frequency. Such flexibility is not provided by current filter technology.

Next steps
The work on the Photonic RF Filter will continue with further development continue under the ARTES SCYLIGHT/C&G co-funded and industry initiated program targeting TRL-8 by 2020.