In the present paper, a new 2-bit analog-to-digital converter (ADC) was
designed and simulated by using 2D photonic crystal (PC) structures to
create a relatively faster and smaller structure. For this purpose, a
PC structure with a square lattice and silicon rods in the air bed was
used. In the proposed structure, a combination of an optical filter
with a linear waveguide, optical nanoresonators, and interference
effects was used to create a 2-bit ADC. To create a structure in
optimal conditions with maximum output optical power, the size of
nanoresonators was scanned to reach the best size. The proposed
structure operated at the operating wavelength of 1550 nm with a
response time of about 1.63 ps, a sampling rate of about 613 GS/s, and
a resolution sampling rate product (RSRP) value of about 2453 ks.
Additionally, the size of the structure was about
194
µ
m
2
, which is small compared with other
structures proposed in this field; it also enjoys high simplicity and
flexibility like structures with other functions, including 4-bit
converters. The amount of power used to create different logic states
was at the rate of
m
W
/
µ
m
2
, which is much lower than the amount
used in similar structures and is achieved using nonlinear effects and
materials. Therefore, due to the excellent results obtained, this
structure is recommended to be used in optical integrated circuits.
The plane wave expansion method was used to extract the photonic
bandgap, and the finite-difference time-domain method was used to
obtain the results related to the output spectrum of the designed
structures.
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