Research On Photonic Integrated Devices Based On The Characteristics Of Two-dimensional Photonic Crystals

With the continuous development of technology and the advent of the era of big data,the contradiction between the integration of electronic devices and the transmission speed is getting bigger and bigger,and the development of devices has fallen into a bottleneck period.Nowadays,because photons have better ability to transmit information and anti-interference ability than electrons,replacing electrons with photons,research,development,design and preparation of high-performance,highly integrated photonic devices has become a major issue at present.Research hotspots,and the emergence of photonic crystals,a special material,has laid a ladder for the development of photonic devices in optical communications and optical integrated systems.According to the relevant characteristics and defect structure of the photonic crystal,various photonic crystal devices with small size,simple structure,high working efficiency and high integration can be designed.Based on the related characteristics and defect structure of two-dimensional photonic crystals,this paper proposes a multifunctional filter beam splitter and a compact polarization beam splitter,and discusses its performance.The specific work is as follows:1.Based on the photonic band gap,photonic local characteristics and defect structure of two-dimensional photonic crystals,a two-dimensional photonic crystal multifunctional tunable filter beam splitter is proposed.This device can not only filter the wavelength at1510 nm,but also The wavelength at 1660 nm is transmitted in single,double,and triple waveguides.In the filtering part,at the resonance wavelength of 1510 nm,the coupling efficiency and drop efficiency of the filter are 96%,the bandpass width is 18 nm,and the Q quality factor is 565.5;at the wavelength of 1660 nm,the straight-line efficiency is 98%.In the beam splitting part,the tunable power output at 1660 nm can be achieved by changing the radius of the dielectric column group in the coupling region or replacing the dielectric column material with a thermally active material.The multifunctional device can not only achieve the functional indicators of a single-function device,but also realize the integration of two functions at the same time,which greatly reduces the insertion loss and connection loss caused by the integration of the single-function device;and the size is the same as that of the single-function device,It can also realize the tunability of power splitting.2.Based on the self-collimation effect of the two-dimensional photonic crystal and the photonic band gap characteristics,a new type of compact polarization beam splitter is proposed.The size of the entire device is 9 ?m×9 ?m.The self-collimation structure and the polarization beam splitting structure are respectively designed.The self-collimation effect of the photonic crystal is used to realize the self-collimated propagation of TE polarized light and TM polarized light in the self-collimating structure,and the photonic band gap characteristic is used to realize the orthogonal separation of TE polarization and TM polarization.The polarization beam splitter structure is composed of these two structures.When the number of air holes of the inserted polarization beam splitter structure is 5,the transmittance of TE polarized light at 1550 nm is 95.4%,and the corresponding polarization extinction ratio is 23 dB.The transmittance of TM polarized light is 88.5%,and the corresponding polarization extinction ratio is 37 dB.For TE and TM polarized light covering a 100 nm bandwidth,the TE polarization extinction ratio and TM polarization extinction ratio are higher than 18 dB and 30 dB,respectively.