Abstract
In this paper we present a fully tunable and reconfigurable single-laser multi-tap microwave photonic FIR filter that utilizes a special SM-to-MM combiner to sum the taps. The filter requires only a single laser source for all the taps and a passive component, a SM-to-MM combiner, for incoherent summing of signal. The SM-to-MM combiner does not produce optical interference during signal merging and is phase-insensitive. We experimentally demonstrate an eight-tap filter with both positive and negative programmable coefficients with excellent correspondence between predicted and measured values. The magnitude response shows a clean and accurate function across the entire bandwidth, and proves successful operation of the FIR filter using a SM-to-MM combiner.
Highlights
The application of optical fiber as photonic signal processors to process high-speed RF data is becoming more important as bandwidth and reconfigurability demands increase [1]
microwave photonic filters (MPFs) can be grouped into two broad categories, single-source MPFs (SSMPFs) and multi-source MPFs (MSMPFs) [2]
MSMPFs operate in the regime of incoherence, defined by systems in which the coherence time of the multiple optical sources is much less than the time delays of the filter
Summary
The application of optical fiber as photonic signal processors to process high-speed RF data is becoming more important as bandwidth and reconfigurability demands increase [1]. Microwave photonic filters (MPFs) have the advantage of having wide bandwidth operation, low loss across the entire bandwidth, and immunity to electromagnetic interference (EMI) [2]. MSMPFs operate in the regime of incoherence, defined by systems in which the coherence time of the multiple optical sources is much less than the time delays of the filter. Tunable and programmable weighting using free space methods such as spatial light modulators [3] and multi-port programmable wavelength processors [4] have been demonstrated. A simple technique using a 1X2 dual output Mach-Zehnder modulator (MZM) to achieve negative weighting by using phased-inversed dual outputs is shown in [5]
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