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 With the selection of the least polarization sensitive photodetector, the gain changes were reduced to less than the measurement limit of 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.
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August 2000
Research Article|
August 01 2000
Implementation of a photonic automatic gain control system for correcting gain variations in the Green Bank Telescope fiber optic system
Steven D. White
Steven D. White
National Radio Astronomy Observatory, Green Bank, West Virginia 24944
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Rev. Sci. Instrum. 71, 3196–3199 (2000)
Article history
Received:
February 15 2000
Accepted:
March 27 2000
Citation
Steven D. White; Implementation of a photonic automatic gain control system for correcting gain variations in the Green Bank Telescope fiber optic system. Rev. Sci. Instrum. 1 August 2000; 71 (8): 3196–3199. https://doi.org/10.1063/1.1305818
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