Fiber-optic analog-to-NRZ binary conversion

A. Siahmakoun; E. Reeves

doi:10.1117/12.2080074

16 March 2015 Fiber-optic analog-to-NRZ binary conversion

A. Siahmakoun, E. Reeves

Proceedings Volume 9357, Physics and Simulation of Optoelectronic Devices XXIII; 935717 (2015) https://doi.org/10.1117/12.2080074
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

A novel photonic analog-to-binary converter based on the first-order asynchronous delta-sigma modulation (ADSM) has been theoretically investigated and experimentally demonstrated. A fiber-optic prototype ADSM system is constructed and characterized. Delta-sigma modulation is a straightforward approach to A/D conversion because in this case an external clocking is not required and demodulation can be simply performed via a low-pass filtering process. To improve signal-to-noise ratio and thus system ENOB, a non-interferometric optical implementation has been constructed. The ADSM is comprised of three photonic devices: an inverted output photonic leaky integrator, bistable quantizer, and positive corrective feedback. The photonic integrator which is a recirculating loop performs the oversampling of an analog input using the cross-gain modulation in an SOA. We will show that the photonic ADSM produces an inverted non-return-to-zero (NRZ) pulse-density modulated output describing an input analog signal. This fiber-optic ADSM converts up to 7.6 MHz analog input at about 30 MS/s and effective ENOB of 6.

Citation Download Citation

A. Siahmakoun and E. Reeves "Fiber-optic analog-to-NRZ binary conversion", Proc. SPIE 9357, Physics and Simulation of Optoelectronic Devices XXIII, 935717 (16 March 2015); https://doi.org/10.1117/12.2080074

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