Abstract
Conventional interferometers split and recombine an optical
signal after some limited optical processing in one or more of their interference
paths. We study an interferometer structure that converts the signal to a
different wavelength range for processing and converts it back to the original
wavelength for interference. In particular, we consider intradyne conversion
of the optical signal in one interferometer arm to digital electronic baseband,
followed by digital electronic signal processing and subsequent electro-optic
conversion, using the same laser for local oscillator and retransmitted signal.
This allows for arbitrary time/frequency manipulations of an optical signal
within the system's bandwidth capabilities while letting the other frequency
portions of the signal pass through the system unchanged. We quantify the
performance of such an opto-electronic interferometer as a subcarrier add/drop
node in a digital optical communication system and study its tolerance to
important practical hardware limitations.
© 2013 IEEE
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