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Frontiers of Optoelectronics

Front. Optoelectron.    2019, Vol. 12 Issue (2) : 148-156     https://doi.org/10.1007/s12200-018-0846-5
RESEARCH ARTICLE
On-chip programmable pulse processor employing cascaded MZI-MRR structure
Yuhe ZHAO, Xu WANG, Dingshan GAO, Jianji DONG(), Xinliang ZHANG
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract

Optical pulse processor meets the urgent demand for high-speed, ultra wideband devices, which can avoid electrical confinements in various fields, e.g., all-optical communication, optical computing technology, coherent control and microwave fields. To date, great efforts have been made particularly in on-chip programmable pulse processing. Here, we experimentally demonstrate a programmable pulse processor employing 16-cascaded Mach-Zehnder interferometer coupled microring resonator (MZI-MRR) structure based on silicon-on-insulator wafer. With micro-heaters loaded to the device, both amplitude and frequency tunings can be realized in each MZI-MRR unit. Thanks to its reconfigurability and integration ability, the pulse processor has exhibited versatile functions. First, it can serve as a fractional differentiator whose tuning range is 0.51−2.23 with deviation no more than 7%. Second, the device can be tuned into a programmable optical filter whose bandwidth varies from 0.15 to 0.97 nm. The optical filter is also shape tunable. Especially, 15-channel wavelength selective switches are generated.

Keywords integrated optics devices      optical processing      all-optical devices      pulse shaping     
Corresponding Authors: Jianji DONG   
Just Accepted Date: 14 September 2018   Online First Date: 23 October 2018    Issue Date: 03 July 2019
 Cite this article:   
Yuhe ZHAO,Xu WANG,Dingshan GAO, et al. On-chip programmable pulse processor employing cascaded MZI-MRR structure[J]. Front. Optoelectron., 2019, 12(2): 148-156.
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http://journal.hep.com.cn/foe/EN/10.1007/s12200-018-0846-5
http://journal.hep.com.cn/foe/EN/Y2019/V12/I2/148
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Yuhe ZHAO
Xu WANG
Dingshan GAO
Jianji DONG
Xinliang ZHANG
Fig.1  Schematics of 16-cascaded MZI-MRR optical filter on SOI wafer
Fig.2  (a) Microscopic image of the pulse shaper. Zoomed in microscopic picture of (b) the grating coupler, (c) the waveguide, (d) the MZI-MRR structure
Fig.3  (a) Transmission power of the device when different voltages are applied to arc electrodes and (b) rings electrodes
Fig.4  Experimental setup of the differentiator employing the programmable pulse shaper. TLD: tunable laser diode, PC: polarization controller, MZM: Mach-Zehnder modulator, AWG: arbitrary waveform generator, EDFA: Erbium doped optical fiber amplifier, ATT: attenuator, OSC: oscilloscope
Fig.5  Transfer function of (a) 0.5-th order, (b) first order and (c) second order
Fig.6  Experimental results for the fractional-order differentiator based on an MZI-MRR. (a) Input pulse; (b) results of 0.51-th order; (c) 0.68-th order; (d) 0.79-th order; (e) first order; (f) 1.25-th order; (g) second order; and (h) 2.23-th order differentiator
Fig.7  Averaged error of the measured results against calculated results changing with various differential order
Fig.8  Measured (blue solid line) and simulated (red dashed line) transfer functions in several specific shapes. (a) Isosceles triangle shape; (b) and (c) right angled triangle shape; (d) square shape
Fig.9  Measured (blue solid line) and simulated (red dashed line) results for square shape transfer functions in different bandwidths. (a) 0.15 nm bandwidth; (b) 0.2 nm bandwidth; (c) 0.25 nm bandwidth; (d) 0.61 nm bandwidth; (e) 0.83 nm bandwidth; (f) 0.97 nm bandwidth
Fig.10  Measured (blue solid line) and simulated (red dashed line) transfer functions of (a) wavelength selective switches, (b) wavelength selective switches with channel 2, 6 and 11 shut down, (c) wavelength selective switches with ‘V’ shape envelope; (d)−(f) corresponding drop-port transfer function of (a), (b) and (c)
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