Abstract
We present an overview of several microwave photonic processing functionalities based on combinations of Mach-Zehnder and ring resonator filters using the high index contrast silicon nitride (TriPleX™) waveguide technology. All functionalities are built using the same basic building blocks, namely straight waveguides, phase tuning elements and directional couplers. We recall previously shown measurements on high spurious free dynamic range microwave photonic (MWP) link, ultra-wideband pulse generation, instantaneous frequency measurements, Hilbert transformers, microwave polarization networks and demonstrate new measurements and functionalities on a 16 channel optical beamforming network and modulation format transformer as well as an outlook on future microwave photonic platform integration, which will lead to a significantly reduced footprint and thereby enables the path to commercially viable MWP systems.
Highlights
Microwave photonic (MWP) signal processing enables RF/microwave processing functionalities unreachable with conventional all-electronic signal processing solutions [1,2]
In this paper we present the key aspects of MWP signal processing in silicon nitride TriPleXTM waveguide platform
The TriPleXTM technology is especially suited for microwave photonics applications mainly due to the combination of low propagation losses in the optical waveguides and high refractive index contrast between core and cladding, allowing for small bend radii
Summary
Microwave photonic (MWP) signal processing enables RF/microwave processing functionalities unreachable with conventional all-electronic signal processing solutions [1,2]. Implementation of MWP circuits in silicon nitride, in particular, has been very prolific in the past eight years, yielding various functions including optical beam forming [4,5,6,7,8], microwave phase shifters [9], microwave filters [10], MWP link [11], ultrawideband signal generation [12], instantaneous frequency measurements [13], microwave polarization networks [14], and fractional Hilbert transformers [15] This breadth of implementations is enabled by a particular silicon nitride platform, known as TriPleXTM waveguide technology, which features a very low propagation loss, compact bend radii, and a mature thermo-optical tuning scheme. We will discuss the prospect of these circuits for future MWP applications
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