27 November 2002 Operational performance of the EVLA digital transmission system
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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.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James M. Jackson, James M. Jackson, Steven J. Durand, Steven J. Durand, } "Operational performance of the EVLA digital transmission system", Proc. SPIE 4845, Advanced Global Communications Technologies for Astronomy II, (27 November 2002); doi: 10.1117/12.459497; https://doi.org/10.1117/12.459497
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