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A linear optical modulator with high FM sensitivity.

E A Ohm1

  • 1Crawford Hill Laboratory, Bell Telephone Laboratories, Inc., Holmdel, New Jersey 07733, USA.

Applied Optics
|January 12, 2010
PubMed
Summary
This summary is machine-generated.

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Potassium dihydrogen phosphate (KDP) in a short laser cavity achieved a large linear frequency deviation (+/-44 Mc/s for +/-110 V) with minimal FM distortion, enabling faithful pulse reproduction.

Area of Science:

  • Optics and Photonics
  • Laser Technology
  • Materials Science

Background:

  • Frequency modulation (FM) is crucial for laser applications.
  • Achieving large linear frequency deviation with low distortion is challenging.
  • Piezoelectric resonances can limit performance in modulated laser systems.

Purpose of the Study:

  • To demonstrate a large linear frequency deviation using Potassium Dihydrogen Phosphate (KDP) in a short laser cavity.
  • To minimize piezoelectric resonances affecting FM sensitivity.
  • To evaluate the FM distortion and fidelity of the modulated laser output.

Main Methods:

  • Utilized KDP crystal within a short laser cavity for frequency modulation.
  • Employed a rigid, highly damped mount to suppress KDP piezoelectric resonances.

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  • Conducted noise loading tests simulating 2400 telephone channels.
  • Performed square wave tests to assess output pulse fidelity.

    • Main Results:

    • Achieved a large linear frequency deviation of +/-44 Mc/s with a moderate modulation voltage of +/-110 V.
    • Limited FM sensitivity change at fundamental resonance (83 kc/s) to +/-5% by damping resonances.
    • Demonstrated negligible FM distortion through noise loading tests.
    • Verified small distortion with faithful input pulse reproduction in square wave tests.

    Conclusions:

    • KDP in a short laser cavity offers an effective method for achieving large linear frequency deviation.
    • Damping piezoelectric resonances significantly improves FM stability and accuracy.
    • The developed system exhibits low FM distortion, suitable for high-fidelity signal transmission.