Ultra-fast 1-bit comparator using nonlinear photonic crystalbased ring resonators

Document Type : Articles


Department of Electrical Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran


In this paper, a photonic crystal structure for comparing two bits has been
proposed. This structure includes four resonant rings and some nonlinear rods. The
nonlinear rods used inside the resonant rings were made of a doped glass whose linear
and nonlinear refractive indices are 1.4 and 10-14 m2/W, respectively. Using Kerr effect,
optical waves are guided toward the correct output ports. In this study, plane wave
expansion and finite difference time domain methods were used for calculation of
photonic bandgap and simulation of optical wave propagation, respectively. The size of
the proposed structure is 1585 μm2 which is more compact than the previous works.
Furthermore, the obtained maximum delay time is about 2 ps that is proper to highspeed
processing. The normalized output power margins for logic 0 and 1 are calculated
as 25% and 71%, respectively. According to the obtained results, this structure can be
used for optical integrated circuits.


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