Optical spatial tracking using coherent detection in the pupil plane

Swanson, Eric A.; Carter, Gary M.; Bernays, D. J.; Hodsdon, David M.

doi:10.1364/ao.28.003918

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…The intermediate frequency (IF) signal, in the absence of nutation, at the balanced detector output can be written as _________________ sjp(t) = tJ2PIFrIhet(tI)z, t,1y) SiiL(WIFt + 9) + n(t), (3) where PIF S the ideal IF signal power when i(1i, t) = 1, WIF = w -wL is the IF frequency, and 9 = 9 -9L represents the random modulation and phase. Noise at the balanced detector output, n(t), is modelled as a narrowband Gaussian random process with two sided power spectral density of .…”

Section: Mathematical Modelmentioning

confidence: 99%

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Analysis of a spatial-tracking subsystem for optical communications

Win

Chen

1992

SPIE Proceedings

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Spatial tracking plays a very critical role in designing optical communication systems because of the small angular beamwidth associated with the optical signal. One possible solution for spatial tracking is to use a nutating mirror which dithers the incoming beam at a rate much higher than the mechanical disturbances. A power detector then senses the change in detected power as the signal is reflected off the nutating mirror. This signal is then correlated with the nutator driver signals to obtain estimates of the azimuth and elevation tracking signals to control the fast scanning mirrors. A theoretical analysis is performed for a spatial tracking system using a nutator disturbed by shot noise and mechanical vibrations. Contributions of shot noise and mechanical vibrations to the total tracking error variance are derived. Given the vibration spectrum and the expected signal power, there exists an optimal amplitude for the nutation which optimizes the receiver performance. The expected performance of a nutator based system is estimated based on the choice of nutation amplitude.

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Section: Mathematical Modelmentioning

confidence: 99%

“…Spatial tracking systems have been investigated by several authors. [2][3][4][5][6][7][8]. Most of the studies were carried for either tracking point source using a quadrant type detector or extended source tracking using array detector.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a spatial-tracking subsystem for optical communications

Win

Chen

1992

SPIE Proceedings

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“…Another advantage of an array is that an array of N small telescopes will have volume 14-N the volume of a single large telescope with the same F-number and total aperture size. The array may be constructed with separate telescopes or it may be formed by placing a detector array in the pupil plane of a larger telescope [1]. Previously such an array was constructed using a Bragg cell as a phase shifter for each channel [2].…”

Section: Introductionmentioning

confidence: 99%

Adaptive coherent optical receiver array

Mercer¹

1990

Electron. Lett. (UK)

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Heterodyne optical detection/spatial tracking system using spatial field pattern matching between signal and local lights

Tsukamoto

Morinaga

1994

Electron. Comm. Jpn. Pt. I

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The spatial tracking system controlling the directivity of the optical antenna determines the quality of communication in the ultradistance intersatellite optical communication system. The spatial tracking system using optical heterodyne detection has a high receiver sensitivity, being less susceptible to background light. This is the dominating factor for noise in cosmic space. In recent years, intensive studies have been made on this system hoping for the tracking performance with a higher accuracy than that obtained by the direct detection system. This paper presents a principle of angular error detection which is different from the conventional system and proposes a new optical heterodyne/spatial tracking system based on that principle. The principle on which the proposed system is based is that the incoming angle of the signal light is tracked by utilizing the variation of the spatial matching to the local light due to the variation of the incoming angle of the signal light. Its feature is that the angle error can be detected using a single ordinary optical detector, not the quadrant optical detector.A theoretical analysis of the noise equivalent angle (NEA) is presented. The optimal local light diffraction pattern is shown for the rectangular antenna apenure.The performance of the system is analyzed from the viewpoint of NEA, and the result is compared to the performance of the optical heterodyne detection/spatial tracking system using the quadrant optical detector.

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Optical spatial tracking using coherent detection in the pupil plane

Cited by 6 publications

References 8 publications

Analysis of a spatial-tracking subsystem for optical communications

Analysis of a spatial-tracking subsystem for optical communications

Adaptive coherent optical receiver array

Heterodyne optical detection/spatial tracking system using spatial field pattern matching between signal and local lights

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