Nonblocking 3 &#xD7; 3 polymer thermo-optic switch array based on total-internal-reflection effect

Lucheng Qv; Jingwen Sun; Hongjun Gu; Jian Sun; Xibin Wang; Yunji Yi; Xiaoqiang Sun; Eric Cassan; Fei Wang; Daming Zhang

doi:10.1364/AO.54.008344

Applied Optics
Vol. 54,
Issue 28,
pp. 8344-8349
(2015)
•https://doi.org/10.1364/AO.54.008344

Nonblocking 3 × 3 polymer thermo-optic switch array based on total-internal-reflection effect

Lucheng Qv, Jingwen Sun, Hongjun Gu, Jian Sun, Xibin Wang, Yunji Yi, Xiaoqiang Sun, Eric Cassan, Fei Wang, and Daming Zhang

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Lucheng Qv, Jingwen Sun, Hongjun Gu, Jian Sun, Xibin Wang, Yunji Yi, Xiaoqiang Sun, Eric Cassan, Fei Wang, and Daming Zhang, "Nonblocking 3 × 3 polymer thermo-optic switch array based on total-internal-reflection effect," Appl. Opt. 54, 8344-8349 (2015)

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Abstract

A nonblocking $3 \times 3$ polymer thermo-optic (TO) switch array based on the total-internal-reflection (TIR) effect is demonstrated. The switch array consists of three $2 \times 2$ TIR TO switch elements with a total device length of 15.5 mm, and achieves nine switching states with no more than one switch element working. The fabricated $3 \times 3$ TO switch array shows excellent switching performance with low crosstalk for all switching states of less than $- 20 dB$ . The power consumption of each switch element is below 53 mW, and the switching rise time and fall time are $\sim 450$ and 550 μs at 1550 nm wavelength, respectively.

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Material	Refractive Index	Density ( $kg / m^{3}$ )	Specific Heat Capacity $C_{p} (J / kg • K)$	Thermal Conductivity (W/mK)
SU-8	1.573	1190	1200	0.20
PMMA	1.483	1190	1420	0.19
Silicon	3.45	2330	703	163
Al	—	2703	903	237

Structural Parameters	Value (μm)	Structural Parameters	Value
Waveguide width	3.0	Center waveguide width	40.0 μm
Rib height	1.0	Bending radius	10.0 mm
Slab thickness	2.0	Waveguide gap	250 μm
Upper cladding thickness	2.0	Half-branch angle	3.25°
Under cladding thickness	2.0	Electrode width	12.0 μm

State	Input	Output	$S_{1}$	$S_{2}$	$S_{3}$
1	$I_{1}$	$O_{1}$	OFF	OFF	ON
2		$O_{2}$	ON	OFF	OFF
3		$O_{3}$	OFF	OFF	OFF
4	$I_{2}$	$O_{1}$	OFF	ON	OFF
5		$O_{2}$	OFF	OFF	OFF
6		$O_{3}$	ON	OFF	OFF
7	$I_{3}$	$O_{1}$	OFF	OFF	OFF
8		$O_{2}$	OFF	ON	OFF
9		$O_{3}$	OFF	OFF	ON

Input	Output Power (dBm)			Power Consumption
Input	$O_{1}$	$O_{2}$	$O_{3}$	Power Consumption
$I_{1}$	−17.5	−37.6	−41.6	$P_{3} = 51.5 mW$
	−39.5	−16.3	−43.2	$P_{1} = 52.9 mW$
	−42.8	−37.8	−15.0	0
$I_{2}$	−15.0	−40.6	−43.6	$P_{2} = 51.6 mW$
	−35.8	−14.5	−43.7	0
	−49.0	−37.6	−17.1	$P_{1} = 52.9 mW$
$I_{3}$	−15.5	−43.5	−38.2	0
	−40.8	−16.2	−38.2	$P_{2} = 51.6 mW$
	−43.3	−48.2	−14.9	$P_{3} = 51.5 mW$

Material	Refractive Index	Density ( $kg / m^{3}$ )	Specific Heat Capacity $C_{p} (J / kg • K)$	Thermal Conductivity (W/mK)
SU-8	1.573	1190	1200	0.20
PMMA	1.483	1190	1420	0.19
Silicon	3.45	2330	703	163
Al	—	2703	903	237

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Applied Optics