Measurements of differential chromatic dispersion and contrasts in a hectometric silica fiber interferometer in the frame of the 'OHANA Project

Sebastien Vergnole; Laurent Delage; Francois Reynaud

doi:10.1117/12.549757

20 October 2004 Measurements of differential chromatic dispersion and contrasts in a hectometric silica fiber interferometer in the frame of the 'OHANA Project

Sebastien Vergnole, Laurent Delage, Francois Reynaud

Author Affiliations +

Proceedings Volume 5491, New Frontiers in Stellar Interferometry; (2004) https://doi.org/10.1117/12.549757
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

In the frame of 'OHANA project (phase II), IRCOM institute is in charge of the 300-meters-long silica fibres devoted to link the Canada France Hawaii Telescope and the GEMINI telescope over J and H-band. In this paper, we report a method to compensate the differential chromatic dispersion between two 300m-long silica polarization maintaining fibres. It consists in adding short fibre length (from 0 to 3 m) on the less dispersive arm. We experimentally demonstrate that the chromatic differential dispersion is different for the two neutral axis of the polarization-maintaining fibre and that a tradeoff between order 2 and 3 of the chromatic dispersion is necessary to reach the best results. Moreover, thanks to a channeled spectrum analysis and using a Taylor series expansion, the spectral phase is analyzed around a mean frequency. Using these data, it is possible to foresee the evolution of the fringes contrast as a function of the additional fibre length. These simulations fit properly the measurements of the fringes contrasts demonstrating the good modeling. At least, we simulate the variation of the contrast as a function of wavelength and spectral resolution over a given spectral window. Consequently, we are able to adjust the fibre lengths in order to perform a coherent linkage maximizing the contrast over J and H-band. The work reported in this paper is part of a global work on fibers in the 'OHANA project. In another paper, Kotani et al. describe the results achieved on fluoride glass fibers devoted the astronomical K-band.

Citation Download Citation

Sebastien Vergnole, Laurent Delage, and Francois Reynaud "Measurements of differential chromatic dispersion and contrasts in a hectometric silica fiber interferometer in the frame of the 'OHANA Project", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); https://doi.org/10.1117/12.549757

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