Theoretical study and demonstration of photonic asynchronous first‐order delta‐sigma modulator for converting analog input to NRZ binary output. Issue 3 (March 2015)

• Record Type: Journal Article
• Authors: Reeves, E.; Costanzo‐Caso, P.; Siahmakoun, A.
• Is Part Of: Microwave and optical technology letters. Volume 57:Issue 3(2015:Mar.)
• Page Start: 574
• Page End: 578
• Publication Date: 2015-03
• Subjects: Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.28907
• Languages: English
• ISSNs: 0895-2477

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>A novel photonic analog‐to‐digital converter based on asynchronous first‐order delta‐sigma modulation (ADSM) has been theoretically investigated and experimentally demonstrated. The architecture uses an optical leaky integrator, an optoelectronic bistable quantizer, and positive corrective feedback for a noninterferometric optical implementation of the ADSM. The principles of the proposed first‐order ADSM are mathematically modeled and simulated. A prototype fiber‐optic system is constructed, producing nonreturn‐to‐zero type binary output for frequencies in the MHz range. For an analog input of 3 MHz and oversampling rate of 13.8 MHz, the system achieves a signal‐to‐noise ratio of about 38 dB, spurious‐free dynamic range of 23 dB, and effective‐number‐of‐bits of 6 within the 7 MHz band of interest. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:574–578, 2015</p> </abstract>