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Optical to microwave converter using direct modulation phase shift keying

  • US 6,741,139 B2
  • Filed: 01/16/2002
  • Issued: 05/25/2004
  • Est. Priority Date: 05/22/2001
  • Status: Expired due to Term
First Claim
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1. A transport to microwave radio frequency adapter that accepts an input telecommunications transport signal on an input port and converts information in such signal to a desired microwave Radio Frequency (RF) carrier, the input transport signal carrying information at an input bit rate, the apparatus comprising:

  • a phase encoder, coupled to receive the transport signal, the phase encoder implementing a Phase Shift Keyed (PSK) encoding such that at least first phase is selected to indicate a first logical value for an input data bit in the transport signal and a second phase is selected to indicate a second logical value for an input data bit in the transport signal, the deviation between the two phases selected to be equal to a predetermined value;

    a local reference oscillator, connected to provide a first microwave carrier;

    a frequency multiplier, connected to receive the output of the local reference oscillator and to multiply the output thereof to a desired microwave RF carrier frequency; and

    a phase modulator, connected to impart a direct phase modulation to the microwave RF carrier.

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