Picosecond Pulse Expansion Using The Low-Pass Filter in Event Timer-Based PPM Communication System

Solovjova, Tatjana; Semenako, Janis; Prigunovs, Dmitrijs; Ortiz, Dilan; Spolītis, Sandis; Āboltiņš, Artūrs

doi:10.1109/mttw56973.2022.9942566

Cited by 3 publications

(1 citation statement)

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“…Using the software presented in [56], several pulses with different waveforms have been modeled, and numerical calculations have been carried out for different types of filters with various cutoff frequencies and filter orders. Analytical derivations and numerical modeling in [56] have confirmed that, of all the filter types, the Bessel-type filter is the most suitable for pulse expansion, as it has a maximally flat group delay and a maximally linear phase response. Those characteristics ensure negligible ringing in the impulse response [57] and minimize overshoots in the pre-transition and post-transition aberration regions of the expanded PPM pulses.…”

Section: Electrical Pulse Expansionmentioning

confidence: 99%

Passive Electrical and Optical Methods of Ultra-Short Pulse Expansion for Event Timer-Based TDC in PPM Receiver

Aboltins,

Solovjova,

Semenako

et al. 2023

Electronics

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The energy efficiency of a communication system using pulse position modulation (PPM) can be increased by reducing the duration of the pulses transmitted over the communication channel to several tens of picoseconds. The employment of an event timer device as a time-to-digital converter (TDC) for demodulation allows the use of PPM with many pulse positions and achieves competitive data transfer speeds. However, along with several-picosecond accuracy of modern event timers, they require a pulse duration of several hundred picoseconds for precise detection. This research is devoted to developing passive techniques for precise pulse expansion from tens of picoseconds to hundreds of picoseconds. We propose two methods: the electrical method, which employs a microstrip low-pass filter (LPF), and the optical method, which uses fiber Bragg grating (FBG). This research offers a detailed analysis of distortion-free pulse expansion requirements, the design of prototypes meeting these requirements, and experimental design verification. Theoretical background, mathematical models, and results of experimental validation of the proposed pulse expansion methods within the laboratory transmitted reference pulse-position modulation (TR-PPM) communication system are provided.

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Section: Electrical Pulse Expansionmentioning

confidence: 99%