  The laser spectroscopy is a fundamental approach for the realisation of
traceable optical frequency standards. In the $1.55\,\mu$m wavelength band,
widely used in telecommunications, the acetylene is the typical and the most
widespread absorption media. We present our investigation of using the hydrogen
cyanide (HCN) as a cost-efficient and readily available alternative, that also
provides a wider frequency span (from $1527\,$nm to $1563\,$nm). We have
compared the practical aspects of using new absorption media in comparison to
existing experience with the acetylene with an outlook to carry out an
independent measurement of the entire spectra. The results should contribute to
the future inclusion of the HCN spectroscopic data into the Mise en pratique,
thus allowing for the use of HCN as a reference for the realisation of
traceable laser standards.
