Broadcast-Satcom

ViaLite RF over fiber links are commonly used in Broadcast-Satcom for the backhauling of outside broadcast content (such as news, live event and sporting coverage) to the studio.  This content is typically sent from production trucks or from regional news studios via satellite.  It is then received at the main broadcast studio for editing and production before being distributed, by uplink, to the viewers and other stations.

RF over fiber links can be used to connect studios to antennas located in antenna farms or on the roofs of tall broadcast buildings (e.g. in metropolitan areas).  They are also commonly used for remoting to other locations, such as outside of metropolitan areas – for a better satellite view or low-rental roof costs.  Long distance links can be used to connect facilities hundreds of kilometers apart.

ViaLite‘s links can be operated in both the transmit or receive paths, and are typically intermediate frequency (IF) L-Band HTS70-140MHz and 10MHz reference links. We offer 75 and 50 ohm products.  1:1 redundancy is available to ensure links are always available.

The link process converts the RF electrical signal to laser light which then travels down the fiber to the receiver, where it is converted back to an RF electrical signal; connecting the satellite dish to the Master Control Room (MCR).

 

The receive chain (downlink)

This typically has an LNB or an LNA coupled to a down convertor to take the satellite signal from C, Ku or Ka-band down to the IF frequency (either 70/140MHz or L-Band HTS).  The signal can be in DVB-S or DVBS2 (for HD) format as the links are protocol transparent.  It is then transported across the fiber to the control room where it is changed back to RF signal and sent to a traditional RF switch matrix or straight to a demodulator.

 

The uplink chain

Typically the signal comes from the modulator in an IF (L-Band HTS or 70/140MHz) and is then converted to light to go across the site to an Up-convertor or a BUC which takes the L-band signal and converts, or converts and amplifies the signal before transmission to the satellite at C, Ku or Ka-Band.

 

Typical applications

  • Broadcast facilities
  • Mobile SNG and flyaways
  • Television receive-only (TVRO)
  • VSAT hubs (IP gateways)
Broadcast-Satcom

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