Broadband RF and Satellite Link Transport

There are many broadband RF applications for fiber.  One important application is satellite uplinks and down links.  Commercial satellites, for long wavelgths applications, typically use an Intermediate Frequency or IF signal as a means on communication. The IF signals is typically 70 or 140 MHz.  The signal has a limited transport distance over copper coax.  The noise level and sensitivity of a satellite system will suffer with the use of copper coax.  The relatively high bandwidth and noise sensitivity issues make IF signal transport ideal for fiber.  As pictured below in figure 32, fiber transport solutions are available for IF satellite applications.

Consumer and residential satellite is findings it way into more and more commercial, corporate and military applications.  Consumer satellite equipment is used in many applications as a source of information and news.  A large corporation may use consumer satellite instead of cable for news and informational content.  In a corporate building or military bunker, the satellite dish may be on the roof many floors above the control or conference room.  The L-Band signal has a bandwidth from 950 to 2150 MHz.  A coax run will not transport the L-band satellite signal very far.  A consumer satellite dish is small due to a shorter wavelength.  It typically has a device called a Linear Noise Block or LNB.  The LNB is an active device that receives the satellite signal and amplifies to be sent down the coax to the receiver.  The LNB requires a DC voltage which is typically generated by the receiver and sent up the coax.  If we use a fiber link, the DC voltage needs to be generated on the dish side of the fiber link.  When designing an L-Band fiber link, the system needs to provide the appropriate LNB DC power.

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