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Mode-locked laser timing jitter limitation in optically enabled, spectrally sliced ADCs

Zazzi, A.; Fang, Dengyang; Müller, J.; Scheytt, J. C.; Gudyriev, S.; Koos, Christian; Marin-Palomo, Pablo; Witzens, J.

Abstract:
Novel analog-to-digital converter (ADC) architectures are motivated by the demand for rising sampling rates and effective number of bits (ENOB). The main limitation on ENOB in purely electrical ADCs lies in the relatively high jitter of oscillators, in the order of a few tens of fs for state-of-the-art components. When compared to the extremely low jitter obtained with best-in-class Ti:sapphire mode-locked lasers (MLL), in the attosecond range, it is apparent that a mixed electrical-optical architecture could significantly improve the converters' ENOB. We model and analyze the ENOB limitations arising from optical sources in optically enabled, spectrally sliced ADCs, after discussing the system architecture and implementation details. The phase noise of the optical carrier, serving for electro-optic signal transduction, is shown not to propagate to the reconstructed digitized signal and therefore not to represent a fundamental limit. The optical phase noise of the MLL used to generate reference tones for individual slices also does not fundamentally impact the converted signal, so long as it remains correlated among all the comb lines. ... mehr



Zugehörige Institution(en) am KIT Institut für Photonik und Quantenelektronik (IPQ)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 04.2020
Sprache Englisch
Identifikator KITopen-ID: 1000130379
Nachgewiesen in arXiv
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