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Radio-over-fibre transmission in communications networks

  • US 10,009,138 B2
  • Filed: 04/10/2014
  • Issued: 06/26/2018
  • Est. Priority Date: 04/10/2014
  • Status: Active Grant
First Claim
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1. A radio-over-fibre transmitter comprising:

  • an optical splitter arranged to receive an optical carrier signal having a carrier optical frequency and arranged to split the optical carrier signal into a plurality of optical carrier signal portions;

    a plurality of electro-optic modulation apparatus each arranged to receive a respective optical carrier signal portion of the optical carrier signal portions and a respective modulated radio frequency subcarrier signal of a plurality of modulated radio frequency subcarrier signals, and each of the plurality of electro-optic modulation apparatus arranged to modulate the respective optical carrier signal portions with the respective modulated radio frequency subcarrier signal and arranged to suppress onward transmission of the respective optical carrier signal portions, to form a respective carrier suppressed optical subcarrier signal at a respective optical frequency, different from the carrier optical frequency;

    an optical combiner arranged to receive the carrier suppressed optical subcarrier signals and an optical carrier signal portion which is not suppressed for onward transmission and arranged to combine said carrier suppressed optical subcarrier signals and the optical carrier signal portion which is not suppressed for onward transmission to form a subcarrier multiplexed optical signal; and

    polarization apparatus arranged to ensure that the carrier suppressed optical subcarrier signals and the optical carrier signal portion which is not suppressed for onward transmission each have a same polarization state at the optical combiner.

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