SOI zero-gap directional couplers are studied by using large cross-section single-mode rib waveguide theory and dual-mode interference principle in silicon direct bonding SOI by back-polishing. And they are fabricated...SOI zero-gap directional couplers are studied by using large cross-section single-mode rib waveguide theory and dual-mode interference principle in silicon direct bonding SOI by back-polishing. And they are fabricated by using KOH anistropic etching. The insertion loss is measured to 4.81 dB, and the crosstalk is below —18.6 dB at a wavelength of 1.3μm.展开更多
Optical fiber interferometric sensors based on [3×3] couplers have been used in many fields. A new technique is proposed to demodulate output signals of this kind of sensors. The technique recovers the signal of ...Optical fiber interferometric sensors based on [3×3] couplers have been used in many fields. A new technique is proposed to demodulate output signals of this kind of sensors. The technique recovers the signal of interest by fitting coefficients of elliptic （Lissajous） curves between each fiber pair. Different from other approaches, this technique eliminates the dependence on the idealization of [3×3] coupler, provides enhanced tolerance to the variance of photoelectric converters, and is anti-polarization in a certain extent. The main algorithm has been successfully demonstrated both by numerical simulation and experimental result.展开更多
We propose an ultra-wideband optical diode device based on two-dimensional square-lattice photonic crystals. For the device, the odd mode is completely transmitted in one direction and converted to the fundamental eve...We propose an ultra-wideband optical diode device based on two-dimensional square-lattice photonic crystals. For the device, the odd mode is completely transmitted in one direction and converted to the fundamental even mode, but completely reflected in the other direction. The operation bandwidth of the device is preserved within a rather wide range of frequencies, which is over 6.5% of the central frequency. A directional coupler and 90° bend are utilized as the composite function device with mode filter and mode converter. It is possible that the photonic crystal device can help to construct on-chip optical logical devices and benefit greatly to the optical systems with multiple spatial modes.展开更多
A novel broadband directional coupler based on an asymmetric dual-core photonic crystal fibet(PCF)is proposed.The asymmetry in the fiher is introduced by the enlargement of one air-hole in dual-core PCF.Numerical inve...A novel broadband directional coupler based on an asymmetric dual-core photonic crystal fibet(PCF)is proposed.The asymmetry in the fiher is introduced by the enlargement of one air-hole in dual-core PCF.Numerical investigation demonstrate that broadband directional coupling with spectral width as large as 370 nm and polarization-dependent loss and uniformity lower than 0.2 and 0.5 dB,respectively,can be achieved.In addition,the proposed fiber shows large tolerance to the variation of the fiber parameters.In particular,the fiber length allows at least 10%derivation from the proposed fiber length of 7.7 mm.展开更多
基金the High Technology Research and Development Programme of China
文摘SOI zero-gap directional couplers are studied by using large cross-section single-mode rib waveguide theory and dual-mode interference principle in silicon direct bonding SOI by back-polishing. And they are fabricated by using KOH anistropic etching. The insertion loss is measured to 4.81 dB, and the crosstalk is below —18.6 dB at a wavelength of 1.3μm.
基金This work was supported by the National Natural Science Foundation of China under Grant No.60673152
文摘Optical fiber interferometric sensors based on [3×3] couplers have been used in many fields. A new technique is proposed to demodulate output signals of this kind of sensors. The technique recovers the signal of interest by fitting coefficients of elliptic （Lissajous） curves between each fiber pair. Different from other approaches, this technique eliminates the dependence on the idealization of [3×3] coupler, provides enhanced tolerance to the variance of photoelectric converters, and is anti-polarization in a certain extent. The main algorithm has been successfully demonstrated both by numerical simulation and experimental result.
基金supported in part by the National Natural Science Foundation of China(Nos.60907032,61205121,and 61275124)the China Postdoctoral Science Foundation(No.2013M540361)+1 种基金the Natural Science Foundation of Zhejiang Province(No.LY13F010011)the Zhejiang Youth Science Fund(No.LQ13F050005)
文摘We propose an ultra-wideband optical diode device based on two-dimensional square-lattice photonic crystals. For the device, the odd mode is completely transmitted in one direction and converted to the fundamental even mode, but completely reflected in the other direction. The operation bandwidth of the device is preserved within a rather wide range of frequencies, which is over 6.5% of the central frequency. A directional coupler and 90° bend are utilized as the composite function device with mode filter and mode converter. It is possible that the photonic crystal device can help to construct on-chip optical logical devices and benefit greatly to the optical systems with multiple spatial modes.
基金supported by the Senior Talent Foundation of Jiangsu University(06JDG062)the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(08KJB510001)+2 种基金Qianjiang Talent Project of Zhejiang Province(2007R10015)the Science Foundation of Ningbo(2008A610001)the National Natural Science Foundation of China(10574058 and 50735001)
文摘A novel broadband directional coupler based on an asymmetric dual-core photonic crystal fibet(PCF)is proposed.The asymmetry in the fiher is introduced by the enlargement of one air-hole in dual-core PCF.Numerical investigation demonstrate that broadband directional coupling with spectral width as large as 370 nm and polarization-dependent loss and uniformity lower than 0.2 and 0.5 dB,respectively,can be achieved.In addition,the proposed fiber shows large tolerance to the variation of the fiber parameters.In particular,the fiber length allows at least 10%derivation from the proposed fiber length of 7.7 mm.
基金The National Natural Science Foundation of China(Nos.61107021,61177027,61077041and 61001006)the Ministry of Education of China(Nos.20110061120052and 20120061130008)+2 种基金the China Postdoctoral Science Foundation funded project(Nos.20110491299and 2012T50297)the Science and Technology Department of Jilin Province of China(No.20130522161JH)the Special Funds of Basic Science and Technology of Jilin University(No.201103076)
