Abstract
We provide analytical modeling and the detailed procedure that is used in recently proposed arbitrary waveform generation technique by using MEMS digital micro-mirror arrays. We estimate the achievable temporal resolution, repetition rate, modulation index and the rise/fall times of the final waveform as figure of merit in the proposed systems. We show that reducing the diffraction limit via increasing the ratio of beam size to lens focal length (>0.075) and the spatial modulation down to single mirror pitch size (10.8μm), waveforms up to 18GHz repetition rates with >90% modulation index and <100ps rise times are achievable. Theoretical calculations are compared with experimental generation of 120MHz square waves and 160MHz sawtooth waves and obtained good agreement.
Highlights
Arbitrary waveform generators (AWGs) find many applications in wide range of fields varying from wideband communication and instrument diagnostics to remote sensing and radar systems
We provide analytical modeling and the detailed procedure that is used in recently proposed arbitrary waveform generation technique by using MEMS digital micro-mirror arrays
We show that reducing the diffraction limit via increasing the ratio of beam size to lens focal length (>0.075) and the spatial modulation down to single mirror pitch size (10.8μm), waveforms up to 18GHz repetition rates with >90% modulation index and
Summary
Arbitrary waveform generators (AWGs) find many applications in wide range of fields varying from wideband communication and instrument diagnostics to remote sensing and radar systems. Using arrayed waveguide grating as a wavelength-division-multiplexing (WDM) scheme with a series of optical attenuators and delay lines as well permits to achieve amplitude and phase modulated gigahertz RF waveforms [2]. This technique, requires adapting the wavelength selective delay lines for each specific RF waveform and complicates the reconfigurability. Up to date MEMS micro-mirror arrays have been proposed for such many application as programmable imaging, display technologies, spectroscopy, microscopy, 3D metrology, and maskless lithography [13,14,15] Use of such devices for arbitrary waveform generation has not been utilized.
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