Abstract
The authors present a review on the recent approaches proposed to implement transversal RF filters. Different tunable transversal filters consisting of wavelength tunable optical taps and those employing the tunability of dispersive devices are presented showing their high-performance characteristics. A comprehensive review of the fundamentals and a discussion on the main limitation of these structures are also included.
Highlights
We have presented the last advances in the implementation of photonic tunable transversal filters for RF signal processing
Following a distinction between filters based on wavelength tunable optical taps and others based on the tunability of the dispersive elements that provide the time delay between samples, last approaches have been discussed
On one hand, interesting results related to the large degree of flexibility shown by the tunable laser array and chirped grating-based structure have been shown together with other cheaper alternatives based on the slicing of broadband optical sources either by using tunable fiber Bragg gratings or by using arrayed waveguide gratings
Summary
Over the last 25 years microwave photonics has been a discipline under constant active research because of the unique properties that photonic devices and systems bring to the generation, transport, processing, and detection of microwave and millimeter wave signals [1]. In moving target identification (MTI) radar systems [11] the filtering of clutter and noise (the unwanted signals) is performed using a digital notch filter placed after frequency downconversion to baseband and analog-to-digital (ADC) conversion. Research contributions within this area extend over the last 25 years starting with the seminal paper of Wilner and Van den Heuvel [3] who noted that the low-loss and highmodulation bandwidth of optical fibers made an ideal candidate as a broadband delay line.
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