Abstract
We present a high link-performance multi-band microwave photonic filter based on stimulated Brillouin scattering (SBS) loss responses. The bandpass filter response is formed by suppressing the out-of-band signal using multiple broadened SBS loss responses, which avoids introducing additional noise in the passband. The low-noise SBS bandpass filter is implemented in an optimized high-performance MWP link, which enabled the demonstration of filter functionalities with a low noise figure, reconfigurability, and high resolution. A noise figure of 18.9 dB is achieved in the passband with a filter bandwidth of 0.3 GHz at a central frequency of 14 GHz, with a link gain of −13.9 dB and a spurious free dynamic range of 106 dB.Hz2/3. Bandwidth reconfiguration from 0.1 GHz to 1 GHz and multi-bandpass responses are also demonstrated.
Highlights
Microwave photonic (MWP) systems have attracted considerable interest in the past decade for radio frequency (RF) applications such as broadband wireless access networks, satellite, and modern radar systems enabling low loss, immunity to electromagnetic interference (EMI), broad bandwidth, reconfigurability and tunability [1,2]
One of the important building blocks in MWP systems is the bandpass MWP filter that can perform the equivalent task of an ordinary electrical microwave filter within a radio frequency (RF) system or link [3,4], exhibiting the advantages of broad processing bandwidth and wide-range tunability offered by photonics
The RF input is generated by vector network analyzer (Agilent VNA) with amplification provided by a low noise amplifier (LNA Mini-Circuits ZVA-213 + 800 MHz to 21 GHz with a typical noise figure of 3 dB and output third order intercept point of + 33 dBm). 1% of the output light from the intensity modulator is tapped for power monitoring while 99% passes through a circulator (C1)
Summary
Microwave photonic (MWP) systems have attracted considerable interest in the past decade for RF applications such as broadband wireless access networks, satellite, and modern radar systems enabling low loss, immunity to electromagnetic interference (EMI), broad bandwidth, reconfigurability and tunability [1,2]. There have been recent efforts to mitigate the additional SBS noise in the passband of an optical filter, using broadband SBS loss to suppress out-of-band signals, which enables the creation of a bandpass response, while avoiding added SBS amplification noise in the passband [19,20,21]. This approach offers a potentially noise-free passband solution for tunable microwave filter technology but needs to be implemented in a high-performance microwave photonic link and to provide desired programmable multi-bandpass MWP filter functionality. Considering the high-resolution RF signal processing that SBS enables, there is a need to merge the high link-performance, highresolution processing and response programmability for SBS-based RF photonic filters that can meet the requirements of practical microwave applications
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