NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Optical phase-locked loop (OPLL) for free-space laser communications with heterodyne detectionSeveral 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.
Document ID
19930034931
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Win, Moe Z.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chen, Chien-Chung
(JPL Pasadena, CA, United States)
Scholtz, Robert A.
(Southern California Univ. Los Angeles, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Free-space laser communication technologies III; Proceedings of the Meeting, Los Angeles, CA, Jan. 21, 22, 1991 (A93-18923 05-74)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Optics
Accession Number
93A18928
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available