Abstract
Due to the limitation of analog-to-digital/digital-to-analog converters, photonics-assisted channelized receivers are thought to be a promising approach to receiving wideband microwave signals. Herein, based on the spectrum analysis and the coherent channelization, we develop a photonics-assisted channelized receiver for multi-band microwave signals. In the proposed channelized receiver, the instantaneous spectral analysis is introduced to determine the frequencies and bandwidth of a dynamic wideband signal. The dynamic wideband signal is then received by a multi-band coherent channelizer. By exploiting transparency of the optoelectronic devices, we equivalently build a multiband coherent channelizer that can work for dynamic microwave signals, where a few optoelectronic devices are required. Compared with the existing coherent channelizers, the operative bandwidth of the proposed multi-band coherent channelizer is much larger (up to 28 GHz). The proposed photonics-assisted channelized receiver doesn't need tunable optical comb generators and RF sources, and it also doesn't require knowing the spectrum information in advance. Moreover, the designed example of the proposed photonics-assisted channelized receiver for a 4 GHz original signal in 2~30 GHz microwave bands is given and discussed. The spectrum information of the dynamic original signals is obtained by monitoring the optical power in each sub-channel. We verify the feasibility of the multi-band coherent channelizer by channelizing two 4 GHz linearly-chirped signals with center frequencies of 4 GHz and 28 GHz into four 1 GHz sub-channels, respectively.
Highlights
Microwave signal receivers with larger bandwidth and higher frequency are a pressing need in both commercial and defense applications such as modern radars, communication satellites, radio over fiber systems, and the 5th generation mobile network [1,2,3,4,5]
Introducing two ultra-flat optical comb generators (U-FOCGs), the original signals are received by the multi-band coherent channelizer, which is illustrated in the lower part of Figure 1
To verify the feasibility of the proposed photonics-assisted multiband microwave receiver, a proof-of-concept system based on the statements in “Photonics-Assisted Multi-Band Receiver for Dynamic Signals in 2–30 GHz Bands” section has been implemented by OptiSystem and VPItransmissionMaker
Summary
Microwave signal receivers with larger bandwidth and higher frequency are a pressing need in both commercial and defense applications such as modern radars, communication satellites, radio over fiber systems, and the 5th generation mobile network [1,2,3,4,5]. A photonics-assisted channelized receiver based on the spectrum analysis and the coherent channelization is proposed for multi-band microwave signals. Introducing two ultra-flat optical comb generators (U-FOCGs), the original signals are received by the multi-band coherent channelizer, which is illustrated in the lower part of Figure 1. After obtaining the spectrum information, the 4 GHz dynamic signal was received by the proposed multi-band coherent channelizer. U-FOCG 1 in Figure 1 was used to provide 7 OCs, where the RF signal source had a frequency of 31 GHz. The CF of every generated OC satisfies (5), where f1oc 192.914 THz and δs 1 GHz. Secondly, 14 v-copies were generated after DSB modulation. By selecting the corresponding v-copies and LOs according to the spectrum information, the 4 GHz dynamic signal was channelized into four 1 GHz sub-signals and received
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