Analysis of response characteristics for polymer directional coupler electro-optic switches

Zheng, Chuantao; Ma, Chunsheng; Yan, Xin; Wang, Xian-Yin; Zhang, Daming

doi:10.1016/j.optcom.2008.09.021

Cited by 32 publications

(16 citation statements)

References 13 publications

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“…The two individual driving signals applied on two upper operation electrodes are +U and −U , respectively. This electrode configuration, which has been already used in our previous reported EO switches (Zheng et al 2008(Zheng et al , 2010, produces much larger electric field along the y direction compared to the electrode configuration with identical applied voltage on two operation electrodes. So the driving voltage of the switch can be decreased.…”

Section: Response Formulation Of MMImentioning

confidence: 99%

“…So the driving voltage of the switch can be decreased. The detailed explanation for the enhancement of electric field can be seen in Zheng et al (2008).…”

Section: Response Formulation Of MMImentioning

confidence: 99%

“…is more than 42 dB, the switching time is about t s = 36.0 ps, and the rise time and fall time are about t rise = t fall = 1.9 ps. Therefore, under operation of the step-change square-wave voltage, we estimate that the cutoff switching frequency is (Zheng et al 2008)…”

Section: Microwave Parametersmentioning

confidence: 99%

“…Electro-optic (EO) switches based on EO effect are one kind of key components in local and trunk optical networks, which should be fabricated with short device length, low switching voltage, low crosstalk, low insertion loss, fast switching speed and large fabrication error tolerance (Sluijter et al 2009;Enami et al 2009;Yan et al 2009). For adapting to this trend, different waveguide structures including the standard directional coupler (DC) (Zheng et al 2008), Y-fed DC (Zheng et al 2009a, b) and Mach-Zehnder interferometer (MZI) (Zheng et al 2009a, b) and different electrode structures involving four-section micro-strip electrodes (Zheng et al 2008), shielded push-pull electrodes (Zheng et al 2010) and revered electrodes (Zheng et al 2009a, b) were adopted in our previous reported EO switches.…”

mentioning

confidence: 99%

“…However, the first issue that should be addressed for our reported DC switch (Zheng et al 2008) is that the match of impedance will decrease the modulation efficiency, while the increase of modulation efficiency will cause the mismatch of impedance. To overcome this problem, in Zheng et al (2010), besides the operation electrodes and grounded electrode, a cover shield was used, and the realization of impedance match and high modulation efficiency was achieved simultaneously by optimizing different parameters.…”

mentioning

confidence: 99%

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Investigation on push-pull polymer Mach-Zehnder interferometer electro-optic switches using improved 3-D mode propagation analysis method

Zheng

Cui

et al. 2011

Opt Quant Electron

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By introducing normalized mode excitation coefficient and total mode excitation coefficient, we improve the 3-D mode propagation analysis (MPA) method for convenient design and analysis of multimode interference (MMI) coupler. With the improved 3-D MPA method and point-matching method, we present a novel formulation technique to analyze the low-and high-frequency characteristics for the impedance-matched polymer Mach-Zehnder interferometer electro-optic (EO) switch based on MMI couplers. As an application, under 1550 nm, optimization and simulation performed for the designed device reveal low driving voltage of 1.375 V with short EO region length of 5 mm. The insertion loss and extinction ratio are less than 3.75 dB and more than 42 dB, respectively. The microwave characteristic impedance is about 49.6 , and due to the less mismatch between lightwave velocity and microwave velocity, the estimated cutoff switching frequency is up to 263 GHz with the 10-90% rise time and fall time about 1.90 ps under the operation of step-style square-wave switching signal. This theoretical cutoff switching frequency is almost 1.53 times of that of our previous reported shielded EO switch with similar design technique.

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Section: Response Formulation Of MMImentioning

confidence: 99%

“…So the driving voltage of the switch can be decreased. The detailed explanation for the enhancement of electric field can be seen in Zheng et al (2008).…”

Section: Response Formulation Of MMImentioning

confidence: 99%

Section: Microwave Parametersmentioning

confidence: 99%