Optical Signal Distribution Schemes for Millimeter Phased Array Radar

Abstract

The goal is the modulation of lasers above the -3dB modulation bandwidth. The approach is to coat one laser facet with an anti-reflection coating and form an external cavity. The external cavity laser was built and characterized theoretically. An impedance-matching microstrip was designed and measured. An 8 GHz oscillator was built using a 0.3 micron MESFET. It was found that the optical feedback increases the light modulation depth by 25 dB on the first harmonic and 34dB on the second harmonic in external cavity laser diodes. The model, which has proven accurate thus far, indicates that diode parasitics make it preferable to use the second harmonic generated by a 30 GHz cavity, rather than the first harmonic from a 60 GHz cavity. Phased Arrays.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1992
Accession Number
ADA256262

Entities

People

  • Ali Ghiasi
  • Anand Gopinath

Organizations

  • University of Minnesota

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • 5G Wireless Networks
  • Amplitude Modulation
  • Analyzers
  • Bandwidth
  • Communication Systems
  • Distributed Feedback Lasers
  • Electromagnetic Fields
  • Electronics Industry
  • Electronics Laboratories
  • Laser Diodes
  • Metal-Semiconductor-Metal Photodetectors
  • Modulation
  • Power Electronics
  • Quantum Cascade Lasers
  • Quantum Efficiency
  • Semiconductor Lasers
  • Semiconductors

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Microwave Engineering.
  • Semiconductor Device Technology

Technology Areas

  • Directed Energy
  • Microelectronics