宽带波导型电光调制器(EOM)可以施加多个频率射频信号,通过3个频率的合成,在激光载波上调制出3对边带。利用这3对边带某一侧的3个频率信号进行Pound-Drever-Hall(PDH)频率锁定实验,通过调整其中某一个频率信号的相位,可以实现对频率锁...宽带波导型电光调制器(EOM)可以施加多个频率射频信号,通过3个频率的合成,在激光载波上调制出3对边带。利用这3对边带某一侧的3个频率信号进行Pound-Drever-Hall(PDH)频率锁定实验,通过调整其中某一个频率信号的相位,可以实现对频率锁定误差信号基线的调整。频率锁定系统中的剩余幅度调制(RAM)噪声同样造成误差信号基线的漂移,通过主动反馈控制系统调制频率信号的相位,实现了对剩余幅度调制噪声的抑制。实验表明,在主动反馈系统闭环后,对剩余幅度调制噪声的抑制程度达到30 d B以上,并有效地抑制了噪声漂移。展开更多
This paper proposes a novel continuous variable coherent optical communication mode. In this mode, two quadrature Stokes parameters are regarded as observed physical quantity, and single linearly polarized component i...This paper proposes a novel continuous variable coherent optical communication mode. In this mode, two quadrature Stokes parameters are regarded as observed physical quantity, and single linearly polarized component is used as carrier wave. At the sending end, electro-optical amplitude modulator （EOM） of 45° azimuth is used to indirectly complete the linear modulation of S2 component, and S3 component is changed by continuously rotating a half-wave plate （HWP）. The receiving end adopts the mode of Q-Q-H wave plate are rotated to select the component of measured S2 or S3. The circuit of balance homodyne detection is designed, and the detection system is built by combination with LabVIEW to complete signal demodulation. New optical path scheme is verified by both theory and experiment.展开更多
Fabrication and characterization of electro-optic modulators based on the novel organic electro-optic materials composed of self-assembled superlattices (SAS) were presented, both wet-dipping self-assembly and vapor p...Fabrication and characterization of electro-optic modulators based on the novel organic electro-optic materials composed of self-assembled superlattices (SAS) were presented, both wet-dipping self-assembly and vapor phase deposition approaches were discussed. Prototype waveguide electro-optic modulators were fabricated using SAS films integrated with low-loss polymeric materials functioning as partial guiding and cladding layers.Promising electro-optic thin film materials including DTPT and PEPCOOH grown from the vapor phase were used for fabrication and test of electro-optic prototype modulators. Finally,the EO coefficient of tens of pm/V was obtained,which can sufficiently support high-speed and small size EO modulators.展开更多
An epoxy-based precursor polymer was prepared from the diglycidyl ether of Bisphenol A and aniline.The precursor polymer was doped with a certain amount of cross-linking agent M20S to obtain a thermal-curable polymeri...An epoxy-based precursor polymer was prepared from the diglycidyl ether of Bisphenol A and aniline.The precursor polymer was doped with a certain amount of cross-linking agent M20S to obtain a thermal-curable polymeric system BPAN+M20S.The thermal curing behavior of BPAN+M20S was studied by means of in-situ infrared spectroscopy and it was found that BPAN+M20S showed significant thermal-curability and had the similar curing dynamics at both 120℃ and 180℃.The curing degree can reach 70 7% at 120℃ and 81 8% at 180℃ within 20 min,respectively.When a two-layer film was prepared with the cured polymer BPAN+M20S as the bottom cladding and an E.O.polymer BPAN-1A-NT as the upper layer,SEM studies showed a perfect interface between the bottom and the upper layers of the two-layer film and the surface of the upper layer was quite smooth.A polymeric planar prototype waveguide,which was fabricated based on the above two-layer film and covered by another layer of UV photoresist,showed good wave-guide performance.展开更多
文摘宽带波导型电光调制器(EOM)可以施加多个频率射频信号,通过3个频率的合成,在激光载波上调制出3对边带。利用这3对边带某一侧的3个频率信号进行Pound-Drever-Hall(PDH)频率锁定实验,通过调整其中某一个频率信号的相位,可以实现对频率锁定误差信号基线的调整。频率锁定系统中的剩余幅度调制(RAM)噪声同样造成误差信号基线的漂移,通过主动反馈控制系统调制频率信号的相位,实现了对剩余幅度调制噪声的抑制。实验表明,在主动反馈系统闭环后,对剩余幅度调制噪声的抑制程度达到30 d B以上,并有效地抑制了噪声漂移。
基金This work was supported by the National Natural Science Foundation of China （Grant No. 61177072）.
文摘This paper proposes a novel continuous variable coherent optical communication mode. In this mode, two quadrature Stokes parameters are regarded as observed physical quantity, and single linearly polarized component is used as carrier wave. At the sending end, electro-optical amplitude modulator （EOM） of 45° azimuth is used to indirectly complete the linear modulation of S2 component, and S3 component is changed by continuously rotating a half-wave plate （HWP）. The receiving end adopts the mode of Q-Q-H wave plate are rotated to select the component of measured S2 or S3. The circuit of balance homodyne detection is designed, and the detection system is built by combination with LabVIEW to complete signal demodulation. New optical path scheme is verified by both theory and experiment.
文摘Fabrication and characterization of electro-optic modulators based on the novel organic electro-optic materials composed of self-assembled superlattices (SAS) were presented, both wet-dipping self-assembly and vapor phase deposition approaches were discussed. Prototype waveguide electro-optic modulators were fabricated using SAS films integrated with low-loss polymeric materials functioning as partial guiding and cladding layers.Promising electro-optic thin film materials including DTPT and PEPCOOH grown from the vapor phase were used for fabrication and test of electro-optic prototype modulators. Finally,the EO coefficient of tens of pm/V was obtained,which can sufficiently support high-speed and small size EO modulators.
文摘An epoxy-based precursor polymer was prepared from the diglycidyl ether of Bisphenol A and aniline.The precursor polymer was doped with a certain amount of cross-linking agent M20S to obtain a thermal-curable polymeric system BPAN+M20S.The thermal curing behavior of BPAN+M20S was studied by means of in-situ infrared spectroscopy and it was found that BPAN+M20S showed significant thermal-curability and had the similar curing dynamics at both 120℃ and 180℃.The curing degree can reach 70 7% at 120℃ and 81 8% at 180℃ within 20 min,respectively.When a two-layer film was prepared with the cured polymer BPAN+M20S as the bottom cladding and an E.O.polymer BPAN-1A-NT as the upper layer,SEM studies showed a perfect interface between the bottom and the upper layers of the two-layer film and the surface of the upper layer was quite smooth.A polymeric planar prototype waveguide,which was fabricated based on the above two-layer film and covered by another layer of UV photoresist,showed good wave-guide performance.
