Many military radar applications call for improved fidelity and shorter timescales in difficult environments
of high background clutter. This paper examines the design of an LO for general radar applications with
very large phase noise and stability improvements over quartz based systems (>50 dB) using fibre-laser
based clockworks and oscillators. The examination is based around a strawman architecture to exploit the
division of very high frequency optical standards (laser lines at 450 or 250 THz) to microwave frequencies
and the consequential high phase noise improvement factors (~100 dB). The design utilises guided systems
(fibre lasers and all other components in fibre) as far as possible to provide an easier to achieve, rugged and
portable system. The design also uses improved non-linear super-continuum generation components, which
require less laser power to drive them (from 100's of mW to 10 mW thus removing the need for optical
power amplification). The use of direct diode pumped fibre-lasers reduces inefficiency as compared with
solid-state free space lasers to make the system low power and air-cooled.
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