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Use of higher order modulation techniques to transmit large aggregate data rates on an optical link with relatively low speed electronics

  • US 6,522,697 B1
  • Filed: 02/11/1999
  • Issued: 02/18/2003
  • Est. Priority Date: 02/11/1999
  • Status: Expired due to Term
First Claim
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1. A method for increasing the information carrying capacity of an optical communication link, comprising the steps of:

  • encoding data streams for transmission onto multiple copies of a carrier to produce multiple signals having an original carrier frequency;

    converting the carriers to appropriate frequencies to provide frequency converted modulated carriers that are spaced so that associated data spectral lobes of the carriers are separated;

    combining the frequency converted modulated carriers to provide a composite signal;

    transmitting the composite signal over the optical communication link;

    receiving the composite signal at a receiving end of the optical communication link;

    separating out the individual data streams from the composite signal;

    converting the individual data streams back to the original carrier frequency; and

    demodulating the data streams to generate the originally transmitted data.

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