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Large-range tunable fractional-order differentiator based on cascaded microring resonators |
Ting YANG,Shasha LIAO,Li LIU,Jianji DONG( ) |
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract In this paper, we experimentally demonstrate an all-optical continuously tunable fractional-order differentiator using on-chip cascaded electrically tuned microring resonators (MRRs). By changing the voltage applied on a MRR, the phase shift at the resonance frequency of the MRR varies, which can be used to implement tunable fractional-order differentiator. Hence fractional-order differentiator with a larger tunable range can be obtained by cascading more MRR units on a single chip. In the experiment, we applied two direct current voltage sources on two cascaded MRRs respectively, and a tunable order range of 0.57 to 2 have been demonstrated with Gaussian pulse injection, which is the largest tuning range to our knowledge.
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Keywords
all-optical devices
optical differentiator
optical signal processing
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Corresponding Author(s):
Jianji DONG
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Just Accepted Date: 03 August 2016
Online First Date: 06 September 2016
Issue Date: 28 September 2016
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