A microwave photonic channelization device with common intermediate frequency

作者：Chong Yu Hua; Yang Chun^*; Li Xiang Hua; Zhu De Zhao; Zhou Zheng Hua

来源：Journal of Optoelectronics - Laser, 2014, 25(12): 2294-2299.

• Coherent optical processing
• Free spectral range
• Frequency differences
• Intermediate frequencies
• Microwave Photonics
• Optical frequency combs
• Optically filtered link
• Photonic downconversion

An RF channelizer based on coherent optical processing is proposed. By employing two optical frequency combs (OFCs) with different free spectral ranges (FSRs) as optical carriers and optical local oscillators respectively, the channelizer can translate all of the frequency channels to a common intermediate frequency (IF). The microwave signal is modulated on every optical carrier, and then all the modulated optical sidebands are filtered by an FP optical filter. Finally, the filtered optical sidebands are coherently detected with the optical local oscillators, and the frequency down-conversion can be achieved. As the FSR of the carrier OFC is a channel bandwidth larger than that of the local OFC, and the FSR of the FP filter is equal to that of the local OFC, the channel of common IF and bandwidth can be realized. Therefore, it is convenient for electronic circuits design. Experiment measurements are demonstrated by translating two adjacent frequency-band ranges over 9.74-9.86 GHz and 9.86-9.98 GHz into a 120 MHz IF bandwidth. The center frequencies of two channels are 900 MHz and 896 MHz, respectively with merely 4 MHz frequency difference. It is indicated that a common IF channel can be accomplished by this method.

• 出版日期2014
• 单位东南大学