Abstract
This paper presents the results from the first monolithically
integrated photonic heterodyne system that allows the two optical
sources to be mutually phase locked by locking to an external
optical reference. High-spectral-purity signals of up to 50 GHz have
been demonstrated from this first fabricated device, where the
tuning range was limited by losses in the input waveguide.
Successful phase locking was accomplished through short signal
propagation delay of less than 2 ns achieved by monolithic
integration and custom-made fast loop electronics. The approach can
be extended to generate signals at >1 THz.
© 2011 IEEE
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