Abstract

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

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References

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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]

1971 (1)

E. Brooker, J. Quantum Electron. QE-7, 42 (1971).
[Crossref]

1970 (1)

E. Brookner, IEEE Trans. Commun. Technol. COM-18, 396 (1970).
[Crossref]

1968 (1)

J. A. Arnaud, J. Quantum Electron. QE-4, 893 (1968).
[Crossref]

1967 (1)

E. Brookner, M. Kolker, R. M. Wilmotte, IEEE Spectrum 4, 75 (1967).
[Crossref]

Arnaud, J. A.

J. A. Arnaud, J. Quantum Electron. QE-4, 893 (1968).
[Crossref]

Brooker, E.

E. Brooker, J. Quantum Electron. QE-7, 42 (1971).
[Crossref]

Brookner, E.

E. Brookner, IEEE Trans. Commun. Technol. COM-18, 396 (1970).
[Crossref]

E. Brookner, M. Kolker, R. M. Wilmotte, IEEE Spectrum 4, 75 (1967).
[Crossref]

Kolker, M.

E. Brookner, M. Kolker, R. M. Wilmotte, IEEE Spectrum 4, 75 (1967).
[Crossref]

Wilmotte, R. M.

E. Brookner, M. Kolker, R. M. Wilmotte, IEEE Spectrum 4, 75 (1967).
[Crossref]

IEEE Spectrum (1)

E. Brookner, M. Kolker, R. M. Wilmotte, IEEE Spectrum 4, 75 (1967).
[Crossref]

IEEE Trans. Commun. Technol. (1)

E. Brookner, IEEE Trans. Commun. Technol. COM-18, 396 (1970).
[Crossref]

J. Quantum Electron. (2)

J. A. Arnaud, J. Quantum Electron. QE-4, 893 (1968).
[Crossref]

E. Brooker, J. Quantum Electron. QE-7, 42 (1971).
[Crossref]

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Figures (1)

Fig. 1
Fig. 1

Block diagram of QTRS: (a) transmitter, (b) receiver consisting of cascade of wide-band and narrow-band quantum amplifiers.

Equations (22)

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B N 2 B G ,
B G B S ,             and
B S B W .
S = 2 ( η e ) 2 N r N s G 2 G ,
N 2 = 2 ( η e ) 2 N r B W G ( G - 1 ) G 2 ( η e ) 2 N r B W G 2 G ,             for G 1.
N 1 / N 2 = 1 / [ η ( G - 1 ) ] 1 / ( η G ) ,             for G 1.
N 3 N 2 = n B W ( G - 1 ) 2 N r G G n B W 2 N r G ,             for G 1.
N 4 N 2 = n B N ( G - 1 ) N r G n B N N r ,             for G 1.
N 5 / N 2 = ( N s B N ) / ( N r B W ) .
N 6 / N 2 = N s / ( N r G ) .
N 7 N 2 N b η N r G 2 G             for G 1 , B 0 B W .
N T N 2 4 π k T B W C ( η e ) 2 N r G 2 G ,             for G 1.
G 1 / η ,
G ( n B W ) / ( 2 N r ) ,
B N N r / n ,
B N ( N r B W ) / N s ,
G N s / N r ,
G 2 G N b / ( η N r ) ,
G 2 G ( 4 π K T B W C ) / ( η e ) 2 N r ,
SNR S / N 2 N s / B s = ( S / N ) QTRS , opt .
( S / N ) D . D . , opt = ( η N s ) / 2 B s = ( η / 2 ) ( S / N ) QTRS , opt .
( S / N ) Het . , opt = ( η N s ) / B s = η ( S / N ) QTRS , opt .

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