For access to this article, please select a purchase option:
Buy conference paper PDF
Buy Knowledge Pack
IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.
A novel scheme based on optoelectronic down conversion is proposed and demonstrated to obtain an ultrahigh spectral purity and tuneable optical beat note in the GHz and millimetre wave range. The resulting beat note linewidth is measured to be better than 1 Hz over 100 GHz leading to a relative stability lower than 10-11. This approach is scalable to the THz domain. (3 pages)