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Frontiers of Optoelectronics

Front. Optoelectron.    2016, Vol. 9 Issue (3) : 483-488     DOI: 10.1007/s12200-016-0559-6
Application of SOI microring coupling modulation in microwave photonic phase shifters
Rui YANG,Linjie ZHOU(),Minjuan WANG,Haike ZHU,Jianping CHEN
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Phase shifter is one of the key devices in microwave photonics. We report a silicon microring resonator with coupling modulation to realize microwave phase shift. With coupling tuning of the Mach-Zehnder interferometer (MZI) coupler to change the resonator from under-coupling to over-coupling, the device can realize a p phase shift on the incoming microwave signal with a frequency up to 25 GHz. The device can also realize 2.5p continuous phase tuning by manipulating the three DC bias voltages applied on the MZI coupler.

Keywords ring resonator      phase shifter      microwave photonics     
Corresponding Authors: Linjie ZHOU   
Just Accepted Date: 18 January 2016   Online First Date: 18 February 2016    Issue Date: 28 September 2016
 Cite this article:   
Rui YANG,Linjie ZHOU,Minjuan WANG, et al. Application of SOI microring coupling modulation in microwave photonic phase shifters[J]. Front. Optoelectron., 2016, 9(3): 483-488.
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Linjie ZHOU
Minjuan WANG
Haike ZHU
Jianping CHEN
Fig.1   Schematic of a microring resonator with coupling enabled by an asymmetric MZI coupler. The blue regions outside the MZI arms are the p-doped regions, and the yellow region in between the MZI arms is the n-doped region. Inset: cross-sectional view of the MZI modulation arms
Fig.2   Optical output power and phase difference responses of the device working at over-coupling and under-coupling
Fig.3   Simulated device performances for (a) optical power and (b) optical phase responses upon bias tuning. The bias voltages in each tuning zone are labeled on the graphs
Fig.4   Simulated optical power (left column) and phase (right column) transmission spectra of all tuning zones. The red dashed line denotes the operation wavelength. The black arrow indicates the spectrum evolution direction
Fig.5  Optical microscope image of the fabricated device. The total length of the device is 1.35 mm. G: ground; S: signal; DC: direct current
Fig.6   Experimental setup to measure the phase shift of a RF signal induced by the device
Fig.7  Measured p phase shift for a RF signal at various frequencies
Fig.8   Measured optical power and phase change upon bias tuning
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