Abstract
In this paper, two different Passive Mode-Locked Laser Diodes (PMLLD)
structures, a Fabry–Perot cavity and a ring cavity laser are characterized
and evaluated as monolithic Optical Frequency Comb Generators (OFCG) for CW
sub-THz generation. An extensive characterization of the devices under study
is carried out based on an automated measurement system that systematically
evaluates the dynamic characteristics of the devices, focusing on the figures
of merit that define the optimum performance of a pulsed laser source when
considered as an OFCG. Sub-THz signals generated with both devices at 60 GHz
and 90 GHz are presented and analyzed in terms of electrical linewidth to
compare such components for mm-Wave and sub-THz photonic generation. This
work offers a systematic comparison of PMLLD devices for OFCG operation and
provides reference information of the performance of two different device
topologies that can be used for the implementation of photonic integrated
sub-THz CW generation.
© 2012 IEEE
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