Optical phase-locked loop for free-space laser communications with heterodyne detection

Moe Zaw Win; Chien-Chung Chen; Robert A. Scholtz

doi:10.1117/12.43741

1 June 1991 Optical phase-locked loop for free-space laser communications with heterodyne detection

Moe Zaw Win, Chien-Chung Chen, Robert A. Scholtz

Proceedings Volume 1417, Free-Space Laser Communication Technologies III; (1991) https://doi.org/10.1117/12.43741
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Several advantages of coherent free-space optical communications are outlined. Theoretical analysis is formulated for an OPLL disturbed by shot noise, modulation noise, and frequency noise consisting of a white component, a 1/f component, and a 1/f-squared component. Each of the noise components is characterized by its associated power spectral density. It is shown that the effect of modulation depends only on the ratio of loop bandwidth and data rate, and is negligible for an OPLL with loop bandwidth smaller than one fourth the data rate. Total phase error variance as a function of loop bandwidth is displayed for several values of carrier signal to noise ratio. Optimal loop bandwidth is also calculated as a function of carrier signal to noise ratio. An OPLL experiment is performed, where it is shown that the measured phase error variance closely matches the theoretical predictions.

Citation Download Citation

Moe Zaw Win, Chien-Chung Chen, and Robert A. Scholtz "Optical phase-locked loop for free-space laser communications with heterodyne detection", Proc. SPIE 1417, Free-Space Laser Communication Technologies III, (1 June 1991); https://doi.org/10.1117/12.43741

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