We demonstrate a novel high-accuracy post-fabrication trimming technique to fine-tune the phase of integrated Mach–Zehnder interferometers, enabling permanent correction of typical fabrication-based phase errors. The...We demonstrate a novel high-accuracy post-fabrication trimming technique to fine-tune the phase of integrated Mach–Zehnder interferometers, enabling permanent correction of typical fabrication-based phase errors. The effective index change of the optical mode is 0.19 in our measurement, which is approximately an order of magnitude improvement compared to previous work with similar excess optical loss. Our measurement results suggest that a phase accuracy of 0.078 rad was achievable with active feedback control.展开更多
Broadband mid-infrared light sources are highly desired for wide-ranging applications that span free-space communications to spectroscopy.In recent years,silicon has attracted great interest as a platform for nonlinea...Broadband mid-infrared light sources are highly desired for wide-ranging applications that span free-space communications to spectroscopy.In recent years,silicon has attracted great interest as a platform for nonlinear optical wavelength conversion in this region,owing to its low losses(linear and nonlinear)and high stability.However,most research in this area has made use of small core waveguides fabricated from silicon-on-insulator platforms,which suffer from high absorption losses of the use of silica cladding,limiting their ability to generate light beyond 3μm.Here,we design and demonstrate a compact silicon core,silica-clad waveguide platform that has low losses across the entire silicon transparency window.The waveguides are fabricated from a silicon core fibre that is tapered to engineer mode properties to ensure efficient nonlinear propagation in the core with minimal interaction of the mid-infrared light with the cladding.These waveguides exhibit many of the benefits of fibre platforms,such as a high coupling efficiency and power handling capability,allowing for the generation of mid-infrared supercontinuum spectra with high brightness and coherence spanning almost two octaves(1.6-5.3μm).展开更多
基金Engineering and Physical Sciences Research Council(EPSRC)(EP/L00044X/1,EP/M022757/1)Wolfson FoundationRoyal Society
文摘We demonstrate a novel high-accuracy post-fabrication trimming technique to fine-tune the phase of integrated Mach–Zehnder interferometers, enabling permanent correction of typical fabrication-based phase errors. The effective index change of the optical mode is 0.19 in our measurement, which is approximately an order of magnitude improvement compared to previous work with similar excess optical loss. Our measurement results suggest that a phase accuracy of 0.078 rad was achievable with active feedback control.
基金supported by the following research funds:the Engineering and Physical Sciences Research Council(EPSRC)(EP/P000940/1)the National Natural Science Foundation of China(NSFC)(61705072)+1 种基金the Norwegian Research Council(262232)the J.E.Sirrine Foundation.
文摘Broadband mid-infrared light sources are highly desired for wide-ranging applications that span free-space communications to spectroscopy.In recent years,silicon has attracted great interest as a platform for nonlinear optical wavelength conversion in this region,owing to its low losses(linear and nonlinear)and high stability.However,most research in this area has made use of small core waveguides fabricated from silicon-on-insulator platforms,which suffer from high absorption losses of the use of silica cladding,limiting their ability to generate light beyond 3μm.Here,we design and demonstrate a compact silicon core,silica-clad waveguide platform that has low losses across the entire silicon transparency window.The waveguides are fabricated from a silicon core fibre that is tapered to engineer mode properties to ensure efficient nonlinear propagation in the core with minimal interaction of the mid-infrared light with the cladding.These waveguides exhibit many of the benefits of fibre platforms,such as a high coupling efficiency and power handling capability,allowing for the generation of mid-infrared supercontinuum spectra with high brightness and coherence spanning almost two octaves(1.6-5.3μm).
