جستجوی مقالات مرتبط با کلیدواژه « optical filter » در نشریات گروه « فیزیک »

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.

In this paper, an optical filter based on a two dimensional photonic crystal ring resonator (PCRR) with triangular lattice is designed and presented. For this purpose, the effects of positioning, arrangement and the number of the inner rods of he dual-curved PCRR on the performance characteristics of our optical filter such as the transmission coefficient and the quality factor have been fully investigated. Calculation results show that a transmission coefficient of 100% with a quality factor of 2400 at the operating wavelength of nearly 1576 nm can be achieved. The proposed optical filter comparatively performs better than the previously reported ones. In addition, this structure can be used for the design of optical multi-channel demultiplexer. To study the photonic band gap of our structure, the plane wave expansion (PWE) method has been used and the finite-difference time-domain (FDTD) method has also been employed to analyze the optical behavior of the proposed device.