Fully Automatic In-Situ Reconfiguration of Optical Filters in a CMOS-Compatible Silicon Photonic Process

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Author(s)Shawon, Md Jubayer
Author(s)Saxena, Vishal
Date Accessioned2023-04-06T20:10:42Z
Date Available2023-04-06T20:10:42Z
Publication Date2023-03-01
Description© 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. This article was originally published in Journal of Lightwave Technology. The version of record is available at: https://doi.org/10.1109/JLT.2022.3222131
AbstractAutomatic reconfiguration of optical filters is the key to novel flexible RF photonic receivers and Software Defined Radios (SDRs). Although silicon photonics (SiP) is a promising technology platform to realize such receivers, process variations and lack of in-situ tuning capability limit the adoption of SiP filters in widely-tunable RF photonic receivers. To address this issue, this work presents a first ‘in-situ’ automatic reconfiguration algorithm and demonstrates a software configurable integrated optical filter that can be reconfigured on-the-fly based on user specifications. The presented reconfiguration scheme avoids the use of expensive and bulky equipment such as an Optical Vector Network Analyzer (OVNA), does not use simulation data for reconfiguration, reduces the total number of thermo-optic tuning elements required, and eliminates several time-consuming configuration steps as in the prior art. This makes this filter ideal in a real-world scenario where the user specifies the filter center frequency, bandwidth, required rejection, and filter type (Butterworth, Chebyshev, etc.), and the filter is automatically configured regardless of process, voltage, and temperature (PVT) variations. We fabricated our design in AIM Photonics' Active SiP process and have demonstrated our reconfiguration algorithm for a second-order filter with a 3 dB bandwidth of 3 GHz, 2.2 dB insertion loss, and > 30 dB out-of-band rejection using only two reference laser wavelength settings. Since the filter photonic integrated circuit (PIC) is fabricated using a CMOS-compatible SiP foundry, the design is manufacturable with repeatable and scalable performance suited for its integration with electronics to realize complex chip-scale RF photonic systems.
SponsorThe authors gratefully acknowledge the generous funding support from the Air Force Office of Sponsored Research (AFOSR) YIP Award FA9550-17-1-0076, DARPA YFA Award HR00112110001, and the National Science Foundation (NSF) CAREER Award EECS-2014109. The authors also thank AIM Photonics and gratefully acknowledge APSUNY PDK Component Library.
CitationM. J. Shawon and V. Saxena, "Fully Automatic In-Situ Reconfiguration of Optical Filters in a CMOS-Compatible Silicon Photonic Process," in Journal of Lightwave Technology, vol. 41, no. 5, pp. 1286-1297, 1 March, 2023, doi: 10.1109/JLT.2022.3222131.
ISSN1558-2213
URLhttps://udspace.udel.edu/handle/19716/32635
Languageen_US
PublisherJournal of Lightwave Technology
KeywordsSilicon photonics
Keywordsoptical filter
Keywordsautomatic tuning
Keywordsintegrated optics
Keywordsthermal crosstalk
Keywordsprogrammable photonics
Keywordsreconfigurable optics
Keywordscalibration
Keywordstuning algorithm
Keywordsfeedback control
TitleFully Automatic In-Situ Reconfiguration of Optical Filters in a CMOS-Compatible Silicon Photonic Process
TypeArticle
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