Abstract

Detection of weak signals in an optical spectrum analyzer is impaired by sidelobes from nearby large signal components in the output spectrum. Strong sidelobes about the zero frequency component particularly inhibit detection of low frequency signals. Sidelobe response can be attenuated by suitable illumination tapering over the input data aperture. Changes of first and second sidelobe levels and main lobe width have been investigated for gaussian, lorentzian, and exponential tapers. Improved capability to distinguish weak low frequency signals in the presence of distortions introduced by component flaws is demonstrated for the exponential form.

© 1970 Optical Society of America

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References

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  1. J. E. Rhodes, Amer. J. Phys. 21, 337 (1953).
    [CrossRef]
  2. L. J. Cutrona, E. N. Leith, E. J. Palermo, L. J. Porcello, Inst. Radio Eng. Trans. IT-6, 386 (1960).
  3. M. Arm, L. Lambert, I. Weissman, Proc. IEEE 52, 842 (1964).
    [CrossRef]
  4. P. Jacquinot, B. Roizen-Dossier, Progress in Optics, E. Wolf, Ed. (North-Holland Publ. Co., Amsterdam, 1964), Vol. 3, pp. 31–184.
    [CrossRef]
  5. J. F. Ramsay, Marconi Rev. 9, 139 (1946).
  6. H. Jasik, Antenna Engineering Handbook (McGraw-Hill Book Co., 1961); see Chap. 2, “Fundamentals of Antennas.”
  7. L. B. Lambert, M. Arm, A. Aimette, in Optical and Electro-Optical Information Processing, J. T. Tippett et al., Eds. (The Massachusetts Institute of Technology Press, Cambridge, 1965), pp. 744–747.
  8. I. Tannhauser, Appl. Opt. 4, 731 (1965).
    [CrossRef]
  9. A. Boivin, Appl. Opt. 6, 1626 (1967).
    [CrossRef]

1967

A. Boivin, Appl. Opt. 6, 1626 (1967).
[CrossRef]

1965

1964

M. Arm, L. Lambert, I. Weissman, Proc. IEEE 52, 842 (1964).
[CrossRef]

1960

L. J. Cutrona, E. N. Leith, E. J. Palermo, L. J. Porcello, Inst. Radio Eng. Trans. IT-6, 386 (1960).

1953

J. E. Rhodes, Amer. J. Phys. 21, 337 (1953).
[CrossRef]

1946

J. F. Ramsay, Marconi Rev. 9, 139 (1946).

Aimette, A.

L. B. Lambert, M. Arm, A. Aimette, in Optical and Electro-Optical Information Processing, J. T. Tippett et al., Eds. (The Massachusetts Institute of Technology Press, Cambridge, 1965), pp. 744–747.

Arm, M.

M. Arm, L. Lambert, I. Weissman, Proc. IEEE 52, 842 (1964).
[CrossRef]

L. B. Lambert, M. Arm, A. Aimette, in Optical and Electro-Optical Information Processing, J. T. Tippett et al., Eds. (The Massachusetts Institute of Technology Press, Cambridge, 1965), pp. 744–747.

Boivin, A.

A. Boivin, Appl. Opt. 6, 1626 (1967).
[CrossRef]

Cutrona, L. J.

L. J. Cutrona, E. N. Leith, E. J. Palermo, L. J. Porcello, Inst. Radio Eng. Trans. IT-6, 386 (1960).

Jacquinot, P.

P. Jacquinot, B. Roizen-Dossier, Progress in Optics, E. Wolf, Ed. (North-Holland Publ. Co., Amsterdam, 1964), Vol. 3, pp. 31–184.
[CrossRef]

Jasik, H.

H. Jasik, Antenna Engineering Handbook (McGraw-Hill Book Co., 1961); see Chap. 2, “Fundamentals of Antennas.”

Lambert, L.

M. Arm, L. Lambert, I. Weissman, Proc. IEEE 52, 842 (1964).
[CrossRef]

Lambert, L. B.

L. B. Lambert, M. Arm, A. Aimette, in Optical and Electro-Optical Information Processing, J. T. Tippett et al., Eds. (The Massachusetts Institute of Technology Press, Cambridge, 1965), pp. 744–747.

Leith, E. N.

L. J. Cutrona, E. N. Leith, E. J. Palermo, L. J. Porcello, Inst. Radio Eng. Trans. IT-6, 386 (1960).

Palermo, E. J.

L. J. Cutrona, E. N. Leith, E. J. Palermo, L. J. Porcello, Inst. Radio Eng. Trans. IT-6, 386 (1960).

Porcello, L. J.

L. J. Cutrona, E. N. Leith, E. J. Palermo, L. J. Porcello, Inst. Radio Eng. Trans. IT-6, 386 (1960).

Ramsay, J. F.

J. F. Ramsay, Marconi Rev. 9, 139 (1946).

Rhodes, J. E.

J. E. Rhodes, Amer. J. Phys. 21, 337 (1953).
[CrossRef]

Roizen-Dossier, B.

P. Jacquinot, B. Roizen-Dossier, Progress in Optics, E. Wolf, Ed. (North-Holland Publ. Co., Amsterdam, 1964), Vol. 3, pp. 31–184.
[CrossRef]

Tannhauser, I.

Weissman, I.

M. Arm, L. Lambert, I. Weissman, Proc. IEEE 52, 842 (1964).
[CrossRef]

Amer. J. Phys.

J. E. Rhodes, Amer. J. Phys. 21, 337 (1953).
[CrossRef]

Appl. Opt.

Inst. Radio Eng. Trans.

L. J. Cutrona, E. N. Leith, E. J. Palermo, L. J. Porcello, Inst. Radio Eng. Trans. IT-6, 386 (1960).

Marconi Rev.

J. F. Ramsay, Marconi Rev. 9, 139 (1946).

Proc. IEEE

M. Arm, L. Lambert, I. Weissman, Proc. IEEE 52, 842 (1964).
[CrossRef]

Other

P. Jacquinot, B. Roizen-Dossier, Progress in Optics, E. Wolf, Ed. (North-Holland Publ. Co., Amsterdam, 1964), Vol. 3, pp. 31–184.
[CrossRef]

H. Jasik, Antenna Engineering Handbook (McGraw-Hill Book Co., 1961); see Chap. 2, “Fundamentals of Antennas.”

L. B. Lambert, M. Arm, A. Aimette, in Optical and Electro-Optical Information Processing, J. T. Tippett et al., Eds. (The Massachusetts Institute of Technology Press, Cambridge, 1965), pp. 744–747.

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Figures (5)

Fig. 1
Fig. 1

Optical spectrum analyzer with taper function.

Fig. 2
Fig. 2

Spectral half-width at half-power points vs transmittance at aperture edge.

Fig. 3
Fig. 3

First sidelobe peak intensity vs cutoff transmittance.

Fig. 4
Fig. 4

Second sidelobe peak intensity vs cutoff transmittance.

Fig. 5
Fig. 5

Spectral profile of a sinusoidal signal with: (a) uniform illumination; (b) exponential taper.

Equations (2)

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b b f T ( x ) f s ( x ) exp ( i p x ) d x ,
A F ( p ) + B 2 i F ( p ω 0 ) B 2 i F ( p + ω 0 ) ,

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