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An integrated 2-bit all optical analog to digital converter based on photonic crystal semiconductor optical amplifier

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Abstract

In this paper, by integrating InP/InGaAsP/InP Photonic crystal semiconductor optical amplifier (PhC-SOA) with photonic crystal channel drop filters (PhC-CDF), we present a novel fully integrated ultra-small low-power all-optical analog to digital converter (AO-ADC). The self-phase modulation in the PhC-SOA can shift the frequency of the Gaussian input pulse. The two output PhC-CDFs are designed in a way that appropriately codes the frequency-shifted pulse by the PhC-SOA, which consequently converts them to four desired digital output levels. The numerical results indicated that the center wavelength of an amplitude modulated Gaussian pulse with a center wavelength of 1551.228 nm, temporal pulse-width of 10.6 ps, and energy of 74.4 fJ can be shifted by 1.652 nm. This shift is accommodated by utilizing a PhC-SOA with a length of 9 µm and an injection current of 6.5 mA. The shifted pulse is then quantized and coded to the four digital levels of (00, 01, 10, 11) by two point-defect PhC-CDFs. The PhC-CDFs minimize the AO-ADC integral and differential nonlinearity (INL/DNL) errors by compensating for the effect of the nonlinear frequency shift induced by PhC-SOA. The proposed design offers a footprint of 142 µm2 AO-ADC working at 10 Gs/s.

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Authors and Affiliations

  1. Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, 1477893855, Tehran, Iran

    Sajjad Moshfe

  2. Faculty of Electrical Engineering, Shahid Beheshti University, Tehran, Iran

    Kambiz Abedi

  3. Nano Plasmo-Photonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, P. O. Box 14115-194, 1411713116, Tehran, Iran

    Mohammad Kazem Moravvej-Farshi

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  1. Sajjad Moshfe
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  2. Kambiz Abedi
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  3. Mohammad Kazem Moravvej-Farshi
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Correspondence to Mohammad Kazem Moravvej-Farshi.

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Moshfe, S., Abedi, K. & Moravvej-Farshi, M.K. An integrated 2-bit all optical analog to digital converter based on photonic crystal semiconductor optical amplifier. Opt Quant Electron 53, 212 (2021). https://doi.org/10.1007/s11082-021-02858-3

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