针对基于波分复用技术的多通道射频光传输模块的通道间隔较小时,因四波混频效应产生的带宽内杂散信号和高低温下波长漂移导致通道增益波动大的问题,基于四波混频原理和光发射机波长调谐原理,设计了多通道射频光传输模块增益波动和带内...针对基于波分复用技术的多通道射频光传输模块的通道间隔较小时,因四波混频效应产生的带宽内杂散信号和高低温下波长漂移导致通道增益波动大的问题,基于四波混频原理和光发射机波长调谐原理,设计了多通道射频光传输模块增益波动和带内杂散解决方案,采用波长组合的优化算法计算出满足要求的一组波长值,通过温度调谐光发射机波长,并使用一种基于调谐波长的调试系统进行了实验验证。实验结果表明:该方案可以将杂散信号调试到工作带宽之外,且同通道、同频点的全温增益变化小于2 d B。展开更多
A 4× 4 multiple-input multiple-output coherent microwave photonic （MWP） link to transmit four wireless signals with an identical microwave center frequency over a single optical wavelength based on optical inde...A 4× 4 multiple-input multiple-output coherent microwave photonic （MWP） link to transmit four wireless signals with an identical microwave center frequency over a single optical wavelength based on optical independent sideband （OISB） modulation and optical orthogonal modulation with an improved spectral efficiency is proposed and experimentally demonstrated. At the transmitter, the OISB modulation and optical orthogonal modulation are implemented to generate an OISB signal using a dual-parallel Mach-Zehnder modulator （DP- MZM） driven by four microwave orthogonal frequency-division multiplexing （OFDM） signals with an identical microwave center frequency. At the receiver, the OISB signal is coherently detected at a coherent receiver where a free-running local oscillator （LO） laser source is employed. Digital signal processing is then used to recover the four OFDM signals, to eliminate the phase noise from the transmitter laser source and the LO laser source, and to cancel the unstable wavelength difference between the wavelengths of the transmitter laser source and the LO laser source. Error-free transmission of three 16 quadrature amplitude modulation （16-QAM） 1 Gbps OFDM signals and one 16-QAM 1.5 Gbps OFDM signal at a microwave center frequency of 2.91 GHz over a 10 km single-mode fiber is experimentally demonstrated.展开更多
To solve the satellite repeater＇s flexible and wideband frequency conversion problem, we propose a novel microwave photonic repeater system, which can convert the upload signal＇s carrier to six different frequencies...To solve the satellite repeater＇s flexible and wideband frequency conversion problem, we propose a novel microwave photonic repeater system, which can convert the upload signal＇s carrier to six different frequencies. The scheme employs one 20 GHz bandwidth dual-drive Mach-Zehnder modulator （MZM） and two 10 GHz bandwidth MZMs. The basic principle of this scheme is filtering out two optical sidebands after the optical carrier suppression （OCS） modulation and combining two sidebands modulated by the input radio frequency （RF） signal. This structure can realize simultaneous multi-band frequency conversion with only one frequency-fixed microwave source and prevent generating harmful interference sidebands by using two corresponding optical filters after optical modulation. In the simulation, one C-band signal of 6 GHz carrier can be successfully converted to 12 GHz （Ku-band）, 28 GHz, 34 GHz, 40 GHz, 46 GHz （Ka-band） and 52 GHz （V-band）, which can be an attractive method to realize multi-band microwave photonic satellite repeater. Alternatively, the scheme can be configured to generate multi-band local oscillators （LOs） for widely satellite onboard clock distribution when the input RF signal is replaced by the internal clock source.展开更多
文摘针对基于波分复用技术的多通道射频光传输模块的通道间隔较小时,因四波混频效应产生的带宽内杂散信号和高低温下波长漂移导致通道增益波动大的问题,基于四波混频原理和光发射机波长调谐原理,设计了多通道射频光传输模块增益波动和带内杂散解决方案,采用波长组合的优化算法计算出满足要求的一组波长值,通过温度调谐光发射机波长,并使用一种基于调谐波长的调试系统进行了实验验证。实验结果表明:该方案可以将杂散信号调试到工作带宽之外,且同通道、同频点的全温增益变化小于2 d B。
基金supported by the Natural Sciences and Engineering Research Council of Canada(NSERC)
文摘A 4× 4 multiple-input multiple-output coherent microwave photonic （MWP） link to transmit four wireless signals with an identical microwave center frequency over a single optical wavelength based on optical independent sideband （OISB） modulation and optical orthogonal modulation with an improved spectral efficiency is proposed and experimentally demonstrated. At the transmitter, the OISB modulation and optical orthogonal modulation are implemented to generate an OISB signal using a dual-parallel Mach-Zehnder modulator （DP- MZM） driven by four microwave orthogonal frequency-division multiplexing （OFDM） signals with an identical microwave center frequency. At the receiver, the OISB signal is coherently detected at a coherent receiver where a free-running local oscillator （LO） laser source is employed. Digital signal processing is then used to recover the four OFDM signals, to eliminate the phase noise from the transmitter laser source and the LO laser source, and to cancel the unstable wavelength difference between the wavelengths of the transmitter laser source and the LO laser source. Error-free transmission of three 16 quadrature amplitude modulation （16-QAM） 1 Gbps OFDM signals and one 16-QAM 1.5 Gbps OFDM signal at a microwave center frequency of 2.91 GHz over a 10 km single-mode fiber is experimentally demonstrated.
基金supported by the National Natural Science Foundation of China (61302060,91438117,91538202)the CAST Fund for Distinguished Young TalentsCASC Scientific and Technological Innovative Research and Design Projects
文摘To solve the satellite repeater＇s flexible and wideband frequency conversion problem, we propose a novel microwave photonic repeater system, which can convert the upload signal＇s carrier to six different frequencies. The scheme employs one 20 GHz bandwidth dual-drive Mach-Zehnder modulator （MZM） and two 10 GHz bandwidth MZMs. The basic principle of this scheme is filtering out two optical sidebands after the optical carrier suppression （OCS） modulation and combining two sidebands modulated by the input radio frequency （RF） signal. This structure can realize simultaneous multi-band frequency conversion with only one frequency-fixed microwave source and prevent generating harmful interference sidebands by using two corresponding optical filters after optical modulation. In the simulation, one C-band signal of 6 GHz carrier can be successfully converted to 12 GHz （Ku-band）, 28 GHz, 34 GHz, 40 GHz, 46 GHz （Ka-band） and 52 GHz （V-band）, which can be an attractive method to realize multi-band microwave photonic satellite repeater. Alternatively, the scheme can be configured to generate multi-band local oscillators （LOs） for widely satellite onboard clock distribution when the input RF signal is replaced by the internal clock source.
