Operational performance of the EVLA optical systems LO and IF

Steven J. Durand; Roshene McCool

doi:10.1117/12.551974

15 September 2004 Operational performance of the EVLA optical systems LO and IF

Steven J. Durand, Roshene McCool

Proceedings Volume 5496, Advanced Software, Control, and Communication Systems for Astronomy; (2004) https://doi.org/10.1117/12.551974
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The Expanded Very Large Array (EVLA) uses fiber optic technologies for intermediate frequency (IF) digital data transmission, and local oscillator and reference distribution (LO). These signals are sent on separate fibers to each of the 27 EVLA antennas. The data transmission system transmits 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 achieved. Each IF signal uses a set of three channels, twelve channels in total, and is wavelength division multiplexed onto a single fiber. The IF system configuration includes an EML CW laser, an erbium doped fiber amplifier (EDFA), passive optical multiplexers, up to 22 km of standard single mode fiber, and an APD optical receiver. The LO system uses two fibers to provide a round trip phase measurement at 1310 nm. The phase requirement for the LO system requires that a phase stability of less than 2.8 picoseconds per hour at 40 GHz be maintained across the entire array. To accomplish this, a near real-time continuous measurement is made of the phase delay of the amplitude modulated 512 MHz signals that are distributed to each antenna. This information is used by the correlator to set the delay on each of the baselines in the array. This paper presents a complete description of the two EVLA fiber systems, LO and IF, including specific component specifications.

Citation Download Citation

Steven J. Durand and Roshene McCool "Operational performance of the EVLA optical systems LO and IF", Proc. SPIE 5496, Advanced Software, Control, and Communication Systems for Astronomy, (15 September 2004); https://doi.org/10.1117/12.551974

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Antennas

Receivers

Single mode fibers

Signal attenuation

Electronics

Optical amplifiers

Data transmission

Show All Keywords

Keywords/Phrases

Search In:

Publication Years