Analysis of InGaAsP-InP Double Microring Resonator using Signal Flow Graph Method
Subject Areas : Journal of Optoelectronical Nanostructures
1 - Department of Physics, Shiraz University of Technology 31371555, Shiraz,
Fars, Iran.
Keywords: Optical Filter, Double Ring Resonator, Microring Resonator, Signal Flow Graph,
Abstract :
The buried hetero-structure (BH) InGaAsP-InP waveguide is used for a
system of double microring resonators (DMR). The light transmission and location of
resonant peaks are determined for six different sets of ring radii with different order
mode numbers. The effect of changing middle coupling coefficient on the box like
response is studied. It is found that the surge of coupling coefficient to the lower values
makes the through port resonance peaks sharper and for a larger amount of middle
coupling values, the transmission decreases according to the order mode numbers. The
DMR design with a small middle coupling and close values for rings perimeters can
generate practical pass bandwidth of the resonant transmission peak. Moreover, any
modification in resonant mode numbers and middle coupling coefficient can change the
width and height of the box like response. A DMR simulated results with the free
spectral range (FSR) of 10.2 nm is validated by comparing with the experimental data.
Achieved results are practical in the filtering process of optical communication.
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