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Applied Optics

Applied Optics


  • Vol. 10, Iss. 5 — May. 1, 1971
  • pp: 1009–1011

System Combining the Best Features of Heterodyne and Direct Detection Receivers

E. Brookner  »View Author Affiliations

Applied Optics, Vol. 10, Issue 5, pp. 1009-1011 (1971)

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A system is presented and analyzed that combines the best features of heterodyne and direct detection systems. It provides the noise suppression characteristics of a heterodyne system; at the same time, it has the advantages of a direct detection system in being able to process equally efficiently received fields that are spatially incoherent or coherent, and in being able to use wide field-of-view receiver optics. Moreover, in the presence of strong background noise and detector thermal noise its performance can be even better than that of a direct detection system for which the only receiver noise present is the signal shot noise. When receiving a spatially incoherent field, its performance could be better than a heterodyne system having the same collector area but requiring a spatially coherent received field. The system uses a cascade combination of a wide-band and narrow-band quantum amplifier in the receiver. In contrast to a previously presented system of this type, which used amplitude modulation, the system now described and analyzed permits almost any type of modulation.

© 1971 Optical Society of America

Original Manuscript: November 5, 1970
Published: May 1, 1971

E. Brookner, "System Combining the Best Features of Heterodyne and Direct Detection Receivers," Appl. Opt. 10, 1009-1011 (1971)

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  1. J. A. Arnaud, J. Quantum Electron. QE-4, 893 (1968). [CrossRef]
  2. E. Brookner, IEEE Trans. Commun. Technol. COM-18, 396 (1970). [CrossRef]
  3. E. Brookner, M. Kolker, R. M. Wilmotte, IEEE Spectrum 4, 75 (1967). [CrossRef]
  4. E. Brooker, J. Quantum Electron. QE-7, 42 (1971). [CrossRef]

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