A widely tunable microwave photonic （MWP） notch filter with high linearity based on a dual-parallel Mach- Zehnder modulator （DPMZM） is proposed and experimentally demonstrated. The motivation of this work lies in ...A widely tunable microwave photonic （MWP） notch filter with high linearity based on a dual-parallel Mach- Zehnder modulator （DPMZM） is proposed and experimentally demonstrated. The motivation of this work lies in the fact that the MWP notch filter previously reported has nonlinear distortions generally induced by the nonlinear property of electro-optic devices. In this scheme, even-order modulated sidebands at the DPMZM output are effectively suppressed by properly adjusting bias voltages of the DPMZM, which are the dominant factor to induce the nonlinear distortions into the MWP notch filter. The proposed scheme is theoretically analyzed and experimentally verified.展开更多
We present a new method to achieve an optical vector network analyzer （OVNA） based on a polarization multi- plexing electro-optic modulator （PM-EOM） without an optical bandpass filter. Optical single sideband （O...We present a new method to achieve an optical vector network analyzer （OVNA） based on a polarization multi- plexing electro-optic modulator （PM-EOM） without an optical bandpass filter. Optical single sideband （OSSB） modulated signals with a tunable optical carrier-sideband ratio （OCSR） are obtained at the output of the PM- EOM. The OCSR can be flexibly tuned by controlling bias voltages of the PM-EOM. The dynamic range of the OVNA is expanded by taking the improvement of the OCSR into account. The transmission response of an optical device under test （ODUT） is measured based on one-to-one mapping from optical domain to electrical domain. By optimizing the OCSR of the OSSB modulated signals, the dynamic range of the OVNA can be effectively improved with 3.TdB. An analytical model is derived to describe the transfer function of the ODUT. The magnitude and phase responses of a fiber Bragg grating are characterized with a large dynamic range.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 61335004 and 61275031the High-Tech Research and Development Program of China under Grant No 2013AA014401
文摘A widely tunable microwave photonic （MWP） notch filter with high linearity based on a dual-parallel Mach- Zehnder modulator （DPMZM） is proposed and experimentally demonstrated. The motivation of this work lies in the fact that the MWP notch filter previously reported has nonlinear distortions generally induced by the nonlinear property of electro-optic devices. In this scheme, even-order modulated sidebands at the DPMZM output are effectively suppressed by properly adjusting bias voltages of the DPMZM, which are the dominant factor to induce the nonlinear distortions into the MWP notch filter. The proposed scheme is theoretically analyzed and experimentally verified.
基金Supported by the National Natural Science Foundation of China under Grant Nos 61377070,61090391 and 61675196the National High-Technology Research and Development Program of China under Grant No 2013AA014203
文摘We present a new method to achieve an optical vector network analyzer （OVNA） based on a polarization multi- plexing electro-optic modulator （PM-EOM） without an optical bandpass filter. Optical single sideband （OSSB） modulated signals with a tunable optical carrier-sideband ratio （OCSR） are obtained at the output of the PM- EOM. The OCSR can be flexibly tuned by controlling bias voltages of the PM-EOM. The dynamic range of the OVNA is expanded by taking the improvement of the OCSR into account. The transmission response of an optical device under test （ODUT） is measured based on one-to-one mapping from optical domain to electrical domain. By optimizing the OCSR of the OSSB modulated signals, the dynamic range of the OVNA can be effectively improved with 3.TdB. An analytical model is derived to describe the transfer function of the ODUT. The magnitude and phase responses of a fiber Bragg grating are characterized with a large dynamic range.
