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Photonic asynchronous delta‐sigma modulator system for analog‐to‐digital conversion
Author(s) -
Siahmakoun Azad,
ConstanzoCaso Pablo,
Reeves Erin
Publication year - 2012
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.26760
Subject(s) - integrator , bistability , delta sigma modulation , photonics , asynchronous communication , physics , microwave , electronic engineering , optics , computer science , engineering , optoelectronics , telecommunications , cmos , bandwidth (computing) , quantum mechanics
A novel photonic asynchronous delta‐sigma modulator (ADSM) has been investigated and demonstrated for the first time in this article. An inverted bistable quantizer is required due to use of a positive feedback in this noninterferometric optical implementation. The principles of the proposed optical first‐order and second‐order ADSM are modeled and analyzed. Two main components of the novel optical ADSM; the leaky integrator and the inverted bistable quantizer have been mathematically analyzed, simulated, and characterized. Finally, a prototype fiber‐optic ADSM is constructed. The prototype operates at MHz frequencies producing four effective‐number‐of‐bits resolution. The reported fiber‐optic ADSM is a very promising for future integration of this system on a photonic chip thus increasing the operation frequency range up to tens of GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1287–1292, 2012