Thermo-Optical Modulation And Application Of Graphene/PDMS Composite Microfiber Ring Resonator

As the demand of the transmission information rate is more and more higher,miniaturized and integrated optical devices are the important development trend in the future.As an important branch of optical communication devices,the Microfiber Ring Resonator(MRR)that made of microfiber has shown the advantages of small size,low transmission loss,easy to make,and good resonance effect,which attracted the attention of many experts and scholars.Light can be propagated through evanescent wave on the surface of micro-ring,thus the micro-ring can be combined with other materials that have excellent properties,which is one of the hot spots in recent years.Both graphene and polydimethylsiloxane(PDMS)have excellent thermal properties.Graphene is two-dimensional layered nanomaterials that have honeycomb structure,which revealed the saturated absorption properties and high stability.PDMS is a flexible film with extremely high thermal light coefficient,whose thermal light coefficient is more than one order of magnitude higher than quartz fiber.The use of graphene and PDMS covering the suface of the micro-ring,which not only enhances the effect of the micro-ring on the transmission light wave,but also adds some excellent performance.In this paper,the characteristics of the thermo-optical modulation of its composite devices were studied.By doing the research on the combination of MRR and graphene,we fabricated a graphene based microfiber ring resonator,and researched its thermal optical modulation characteristics,we employed 1550 nm signal light propagate in the micro rings,when 980 nm pump light with various output power that incident into the external irradiation graphene micro-ring's surface for signal light's modulation.As the pump power increased from 0mW to 700 m W,the resonant wavelength had moved 0.65 nm totally,which was 8.5 times of the single test micro-ring output spectrum to the pump light response.Combining the MRR and PDMS,we produced a PDMS covered micro-ring resonator as a tunable filter,and installed into the resonant cavity of the laser.By changing the temperature of the device,and tuning the polarization controller,the output wavelength of the laser was tuned,and the multiwavelength output are realized,which also characterized of tunable wavelength.The innovation of this experiment is to embed the micro-ring in the resonant cavity of the laser and realized multi-wavelength output and wavelength tunable.The MRR and graphene were combined with PDMS.In the experiment,we produced a micro-ring resonator temperature sensor based on graphene and PDMS.In the temperature range from 30 ? to 60 ?,the change of the transmission power sensitivity in the process of heating and cooling were 0.544 dB / ? and 0.536 dB/ ?.,respectively.During the heating process,the resonant wavelength moving sensitivity was as high as 0.533 nm / ?.The innovation of this experiment is that we propose and make a new type of temperature sensor and researched the change of microring transmission loss with temperature variety.