Independently Tunable Multichannel Fractional-Order Temporal Differentiator Based on a Silicon-Photonic Symmetric Mach–Zehnder Interferometer Incorporating Cascaded Microring Resonators

Autor:	Weilin Liu, Jianping Yao, Wangzhe Li, Weifeng Zhang, Hiva Shahoei
Rok vydání:	2015
Předmět:	Physics Silicon photonics business.industry Physics::Optics Optical polarization Mach–Zehnder interferometer Atomic and Molecular Physics and Optics Optical pumping Resonator Differentiator Interferometry Optics Channel spacing Optoelectronics business
Zdroj:	Journal of Lightwave Technology. 33:361-367
ISSN:	1558-2213 0733-8724
DOI:	10.1109/jlt.2014.2377657
Popis:	A multichannel fractional-order temporal differentiator with independently tunable differentiation order based on an integrated silicon-photonic symmetric Mach–Zehnder interferometer consisting of cascaded microring resonators (MRRs) is designed, fabricated, and experimentally demonstrated. By controlling the radii of the MRRs, a multichannel spectral response with uniform channel spacing is obtained, which is used to function as a multichannel temporal differentiator with multiple subdifferentiators. The differentiation order of each subdifferentiator is independently tunable by optically pumping the corresponding MRR, which leads to the phase change in the spectral response due to the two-photon absorption induced nonlinear effect. A five-channel temporal differentiator with a channel spacing of 0.49 nm is fabricated on a silicon-on-insulator chip using a CMOS-compatible process with 193-nm-deep ultraviolet lithography. Independent tuning of the differentiation orders of the subdifferentiators is experimentally demonstrated.
Databáze:	OpenAIRE
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