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Proceedings Paper

Operational performance of the EVLA digital transmission system
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Paper Abstract

The Expanded Very Large Array (ELVA) uses fiber optic technologies for the Digital Data Transmission, the Local Oscillator and Reference distribution, and all Monitor/Control functions. These signals are sent on separate fibers to each of the twenty-seven EVLA antennas. The Data Transmission System (DTS) is used to transmit the four digitized IF signals from the antennas to the Central Electronics Building. A sustained data rate of 10.24 Gbits/s per channel and 122.88 Gbits formatted per antenna is supported. Each IF signal uses a parallel interface of three synchronized single bit high-speed serial optical fiber transmission channels. Each set of three channels, twelve channels in total, is wavelength division multiplexed onto a single fiber. The formatted data are received and de-formatted before the data are sent to the correlator. The system configuration includes a CW laser, an Erbium Doped Fiber Amplifier, passive optical multiplexers, up to 22 km of standard single mode fiber and an APD optical receiver. This paper presents a complete description of the EVLA fiber system including specific component specifications. The calculated performance of the IF system is compared to the actual performance and resulting "Lesson Learned" are presented.

Paper Details

Date Published: 27 November 2002
PDF: 12 pages
Proc. SPIE 4845, Advanced Global Communications Technologies for Astronomy II, (27 November 2002); doi: 10.1117/12.459497
Show Author Affiliations
James M. Jackson, National Radio Astronomy Observatory (United States)
Steven J. Durand, National Radio Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 4845:
Advanced Global Communications Technologies for Astronomy II
Robert I. Kibrick, Editor(s)

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