Abstract
A high conversion efficiency microwave photonic frequency downconverter
based on an integrated dual-parallel Mach Zehnder modulator (DPMZM) and optical
phase shifter configuration, is presented. This structure features the advantages
of high conversion efficiency, robust operation, and ability to function over
a very wide frequency range. The introduction of a novel phase shifter that
is incorporated within the structure enables a high rejection of over 45 dB
of the local oscillator (LO) to be achieved. The integrated DPMZM based photonic
mixer also has a lower noise figure and a higher spurious free dynamic range
compared to the conventional dual-series modulator based photonic mixer. Experimental
results demonstrate a significant improvement of 23.7 dB in the conversion
efficiency compared to the conventional dual-series modulator based photonic
mixer for the same optical power into the photodetector.
© 2012 IEEE
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