Abstract
A stopband and passband switchable microwave photonic filter based on the integrated tunable dual ring coupled Mach–Zehnder interferometer has been demonstrated. By using the optical single sideband modulation, the switchable stopband and passband optical responses of the optical filter are one-to-one mapping to the RF spectra. The center frequency and bandwidth of the switchable microwave photonic filter are both reconfigurable. A frequency tuning range of 4–25 GHz is obtained, and the bandwidth tuning ranges of the passband and stopband MPFs are 4.54–9.72 GHz and 3.65–6.35 GHz, respectively. In addition, a RF rejection ratio about 20 dB is achieved. Compared with the switchable MPFs implemented by nonintegrated devices, the proposed switchable MPF provides a simple and low cost method to process radiofrequency signals.
Highlights
Microwave photonic (MWP) technology can achieve the purpose of processing radiofrequency (RF) signals in optical domain with its intrinsic advantages of low loss, large bandwidth, reconfigurability and immunity to electromagnetic interferences [1], [2]
A stopband and passband switchable microwave photonic filter based on the integrated tunable dual ring coupled Mach–Zehnder interferometer has been demonstrated
In order to achieve an integrated bandpass and bandstop switchable microwave photonic filters (MPFs) with reconfigurable frequency and bandwidth, here we propose a MPF by using phase modulation (PM) and integrated dual-ring coupled Mach-Zehnder interferometer (DR-MZI)
Summary
Microwave photonic (MWP) technology can achieve the purpose of processing radiofrequency (RF) signals in optical domain with its intrinsic advantages of low loss, large bandwidth, reconfigurability and immunity to electromagnetic interferences [1], [2]. In Ref [16], a bandpass MPF was achieved by using phase modulation (PM) and an optical notch filter, whose frequency can be tuned from 2 to 18.4 GHz, the obtained bandwidth and out of band RF rejection are 170 MHz and 26.5 dB, respectively. A bandpass MPF was achieved by using intensity modulation (IM) and an optical bandpass filter [18], the filter’s frequency and bandwidth tuning range are 18∼40 GHz and 5∼15 GHz, respectively. In order to achieve an integrated bandpass and bandstop switchable MPF with reconfigurable frequency and bandwidth, here we propose a MPF by using PM and integrated dual-ring coupled Mach-Zehnder interferometer (DR-MZI). The RF rejection ratio about 20 dB is achieved
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