Side-polished Optical Fiber And Microfiber With Coated Titanium Dioxide And Its Light Control Characteristics

Optical fiber sensing is an important branch of optical fiber applications,which has been developing rapidly since the beginning of 1977.It is one of the emerging high-tech applications in recent years,and has been widely used in various fields.Nowadays,there is an upsurge in the research of all-optical fiber devices fabricated from all kinds of optical fiber and nanomaterial.And these devices are of great significance to achieve all-optical system in the future.The combination of TiO2 and various optical fibers has become research hotspots in recent years.In experiments,we firstly deposited TiO2 nanoparticles on the side polished fiber(SPF)and microfiber(MF),and then investigated the light-controllable characteristics of these devices.The contents of the paper mainly includes the light-controllable characteristics of the SPF or the MF deposited with TiO2 in broadband operation,when the violet light(?=405nm)is employed as external pump light to illuminate TiO2,and the light-controllable characteristics of the SPF deposited with TiO2 in broadband operation when the wavelength of the internal pump light of 980 nm.The changeable transmittance of the signal light in broadband ranging from 1520 nm to 1620 nm in the optical fiber was measured by using violet light(?=405nm)as external pump light,and which irradiates the polished region of SPF deposited with TiO2 by the method of natural evaporation deposition.The experimental results demonstrate the change of the transmitted optical power of the SPF without TiO2 is ~0.05 dB in broadband ranging from 1520 nm to 1620 nm when the violet power increases from 0mW to 1.17 mW.The transmitted optical power of the SPF with TiO2 has a maximum relative variation of ~0.17 dB with respect to the increase of adjustable violet power from 0mW to 1.17 mW.The transmitted optical power increases with the increasing violet power,and it has a great linear correlation coefficient at different wavelengths.The device has linear correlation coefficients of better than 96% and a sensitivity of 0.12 dB/m W.The changeable transmittance of the signal light in broadband ranging from 1520 nm to 1620 nm in the optical fiber was measured by using violet light(different from the above source,?=405nm)as pump light,which irradiates the tapered region of MF deposited with TiO2 by the method of natural evaporation deposition.The experimental results demonstrate the change of the transmitted optical power of the MF without TiO2 is ~0.2dB in broadband ranging from 1520 nm to 1620 nm when the violet power increases from 0mW to 11 mW.The optical transmitted power of the MF with TiO2 has a maximum relative variation of ~3.3dB with respect to the increase of adjustable violet power from 0mW to 11 mW.The optical transmitted power increases with the increasing violet power,and it has a great linear correlation coefficient at different wavelengths.The device has linear correlation coefficients of better than 95% and a sensitivity of 0.3 dB/mW.The changeable transmittance of the signal light in broadband ranging from 1520 nm to 1620 nm in the optical fiber was measured by using WDM couple with 980 nm laser,and signal light through SPF deposited with TiO2 by the method of natural evaporation deposition.The experimental results demonstrate the change of the optical transmitted power of the SPF without TiO2 is ~0.07 dB in broadband ranging from 1520 nm to 1620 nm when 980 nm laser power increases from 0mW to 150 mW.The transmitted optical power of the SPF with TiO2 has a maximum relative variation of ~0.65 dB with respect to the increase of adjustable 980 nm laser power from 0mW to 150 mW.The optical transmitted power increases with the increasing 980 nm laser power,and it has a great linear correlation coefficient at different wavelengths.The device has linear correlation coefficients of better than 99% and a sensitivity of 0.004 dB/mW.The innovations of this paper are as follows:1.We proposes a photonic device that can realize light-dependent control combined SPF or MF with TiO2.2.We verifies the light-controlled characteristics of the SPF device with deposited TiO2(based on external pump light(?=405nm)or internal pump light(?=980nm))and the MF device with deposited TiO2(based on external pump light(?=405nm)),and the two devices have a good linear response to pump light.