Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· References in the article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Implementation of a photonic automatic gain control system for correcting gain variations in the Green Bank Telescope fiber optic system
Authors:
White, Steven D.
Affiliation:
AA(National Radio Astronomy Observatory, Green Bank, West Virginia 24944)
Publication:
Review of Scientific Instruments, Volume 71, Issue 8, pp. 3196-3199 (2000). (RScI Homepage)
Publication Date:
08/2000
Origin:
AIP
PACS Keywords:
Radio telescopes and instrumentation; heterodyne receivers, Birefringence, polarization
DOI:
10.1063/1.1305818
Bibliographic Code:
2000RScI...71.3196W

Abstract

The application of a photonic automatic gain control system, over a 3 km loop of single-mode fiber for the 100 m Green Bank Telescope in order to correct the effects of polarization state changes, is described. Commercially available photodetector conversion gains are polarization mode dependent, which produce microwave gain changes on the order of 10-2. With the selection of the least polarization sensitive photodetector, the gain changes were reduced to less than the measurement limit of 10-4. The implementation of the control loop with a digital feedback loop is detailed, along with measured results and correction limit explanations. Effects of temperature on the quadrature point and corrections for small temperature deviations with a direct current bias circuit is also described.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints