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IF Fiber Optics and Digital Correlating Spectrometer on the JCMT-CSO Interferometer

Published online by Cambridge University Press:  12 April 2016

O.P. Lay ,
R.E. Hills  and
J. Carlstrom
O.P. Lay
Affiliation:
Milliard Radio Astronomy Observatory, Cambridge, England
R.E. Hills
Affiliation:
Milliard Radio Astronomy Observatory, Cambridge, England
J. Carlstrom
Affiliation:
Astronomy Department, California Institute of Technology, Pasadena, California

Extract

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This paper describes the delay lines designed and built for the JCMT-CSO submillimeter interferometer located on the summit of Mauna Kea, Hawaii and described in the paper by Carlstrom et al. in these proceedings.

One of the major features of the project is the use of fiber optics instead of coaxial cable to bring the IF signals (l-2GHz) from the receivers to the spectral line correlator via a set of fiber optic delay lines. Optical fiber now has many advantages over coax including very large bandwidth, low loss, economical cost and size and immunity to electrical interference.

Soares et al. (these proceedings) describe a delay line system that can be used with a broadband continuum correlator requiring very fine delay steps The JCMT-CSO interferometer was intended to be used primarily with a digital correlating spectrometer that has a range of built-in delays, greatly easing the demand on delay line resolution.

Type
2. Technical Innovations
Information
International Astronomical Union Colloquium , Volume 140: Astronomy with Millimeter and Submillimeter Wave Interferometry , 1994 , pp. 117 - 118
Copyright
Copyright © Astronomical Society of the Pacific 1994