An Optical Five Channel Demultiplexer-Based Simple Photonic Crystal Ring Resonator for WDM Applications

We have proposed simple ring resonator 5-channel demultiplexer based on optical channel drop filter analysis that is applicable at third communication window (1550â†nm) range. Our proposed base filter is the important part in designing the demultiplexer, inclusive one ring resonator contains one square dielectric rod at core. Demultiplexer structure introduced by arranging five filter with different ring core refractive index. Insomuch every ring core have individual refractive index, thus each ring have diverse resonant wavelength. Numerical results by the finite difference time domain (FDTD) method show quality factor (Q) and transmission efficiency of fundamental channel drop filter are 1038 and 93â†%, respectively. It is found that transmission efficiency in designed demultiplexer is more than 90â†% for each channel; channel spacing is less than 4.2â†nm. The average crosstalk value, total footprint of demutiplexer is-17.85â†dB, 689.61â†μm2, respectively. Small size with a very simple ring design can be benefit in photonic integrated circuit. © 2020 Walter de Gruyter GmbH, Berlin/Boston 2020.