Journal Pre-proof A novel design for 2-bit optical analog to digital (A/D) converter based on nonlinear ring resonators in the photonic crystal structure Mojtaba Hosseinzadeh Sani, Saeed Khosroabadi, Anis Shokouhmand PII: S0030-4018(19)30928-9 DOI: https://doi.org/10.1016/j.optcom.2019.124760 Reference: OPTICS 124760 To appear in: Optics Communications Received date : 9 July 2019 Revised date : 22 September 2019 Accepted date : 13 October 2019 Please cite this article as: M.H. Sani, S. Khosroabadi and A. Shokouhmand, A novel design for 2-bit optical analog to digital (A/D) converter based on nonlinear ring resonators in the photonic crystal structure, Optics Communications (2019), doi: https://doi.org/10.1016/j.optcom.2019.124760. This is a PDF ﬁle of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the deﬁnitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its ﬁnal form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2019 Published by Elsevier B.V.