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Variable chirp optical modulator using single modulation source

  • US 5,835,212 A
  • Filed: 10/18/1996
  • Issued: 11/10/1998
  • Est. Priority Date: 10/18/1996
  • Status: Expired due to Fees
First Claim
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1. An electro-optic device for providing a modulated output optical signal, said device comprising:

  • a first directional coupler means for receiving an optical signal having an intensity and generating therefrom first and second major optical signals each having a value of power selected in response to received command signals;

    a first interferometer receiving said first major optical signal, and includinga first interferometer input optical coupler for providing first interferometer reference and modulation optical signals;

    first and second optical waveguides for respectively guiding said received first interferometer reference and modulation optical signals; and

    a first interferometer output optical coupler for combining said first interferometer reference and modulation optical signals;

    a second interferometer receiving said second major optical signal, and includinga second interferometer input optical coupler for providing second interferometer reference and modulation optical signals;

    third and fourth optical waveguides for respectively guiding said received second interferometer reference and modulation optical signals; and

    a second interferometer output optical coupler for combining said second interferometer reference and modulation optical signals;

    a modulation means for providing, in response to received modulation control signals, a single modulation signal to optical signals propagating in modulation legs of said first and second interferometers, said single modulation signal having asymmetric phase modulation magnitudes in said first and second interferometer modulation legs; and

    a second directional coupler means for receiving modulated optical signals from said interferometers, and generating therefrom a combined modulated optical signal having a power from each of said modulated optical signals selected in response to received command signals.

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