Abstract
A theoretical study of temperature dependent tuning of defect mode inside photonic bandgap of one-dimensional photonic crystal with binary defect for optical communication applications based on coarse wavelength division multiplexing (CWDM) is presented. The transmission properties of the proposed structure are investigated through the transfer matrix method (TMM) at normal incidence. The proposed contraption is capable of selecting and switching any one wavelength channel at a time centered at particular wavelength out of 12 CWDM channels as per the international telecommunication union (ITU) grid G.694.2. It is very useful for narrowband wavelength selective switching (NWSS) applications based on CWDM. This study also provides some insight to design new kind of thermally tunable optical filters which can be used effectively in remote sensing and thermal imaging applications.
Highlights
Photonic crystals (PCs) have been the object of intensive studies in the past two and half decades due to their unique electromagnetic properties and potential applications [1,2,3,4,5,6,7,8,9,10]
Analytical and numerical calculations of the defect mode tunneling through 1D defect photonic crystal (DPC) have been carried out by many authors [11,12,13,14,15] but none of them extended their work to study thermally tunable narrowband wavelength selective switching (NWSS) properties of 1D DPC for optical communication applications based on coarse wavelength division multiplexing (CWDM)
The working principle of the proposed structure works on the temperature dependent tuning of the defect mode inside PBG in such a way that any change in temperature of DPC changes the thicknesses of layers A and B according with Eq (10) which in turn influences the range of PBG of PC
Summary
Photonic crystals (PCs) have been the object of intensive studies in the past two and half decades due to their unique electromagnetic properties and potential applications [1,2,3,4,5,6,7,8,9,10]. Introduction of extra element into PC destroys the periodicity and leads to the appearance of the narrow peaks with high transmittance at a frequency inside the PBG, socalled defect modes This property of one-dimensional (1D) defect photonic crystal (DPC) is very useful for designing of tunable optical filters which have potential applications in wavelength division multiplexing (WDM) based optical networks because of their ability to control propagation of light. Though the spectral width of each channel of conventional CWDM channels should be between 13-15 nm, the spectral width of the defect mode of the proposed filter is much smaller of the order 4 nm and makes the structure to be used very effectively for NWSS applications It is capable of becoming a key component of WDM based optical networks for enlarging their capacity and flexibility by overcoming the inherent limitations of a semiconductor optical amplifier (SOA) based wavelength selective switches, such as power consumption, signal to noise ratio, speed, polarization and size etc.
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