4 × 4 nonblocking optical switch fabric based on cascaded multimode interferometers

Zuxiang Li; Linjie Zhou; Liangjun Lu; Shuoyi Zhao; Dong Li; Jianping Chen

doi:10.1364/prj.4.000021

Photonics Research, Volume. 4, Issue 1, 0021(2016)

4 × 4 nonblocking optical switch fabric based on cascaded multimode interferometers

Zuxiang Li, Linjie Zhou^*, Liangjun Lu, Shuoyi Zhao, Dong Li, and Jianping Chen

State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of ElectronicEngineering, Shanghai Jiao Tong University, Shanghai 200240, China

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Fig. 1. (a) Structure of the 4×4 switch based on cascaded GMZIs. (b) All switching states of single 4×4, 3×3, and 2×2 GMZIs. (c) Cross-sectional schematic of the TO phase shifter.

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Fig. 2. (a) Optical microscope image of the fabricated 4×4 switch. (b) Zoom-in view of the GMZI switch element. (c) Home-packaged switch chip.

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Fig. 3. Measured transmission spectra for state ID=3.

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Fig. 4. Measured transmission spectra for state ID=22.

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Fig. 5. Histogram of on-chip insertion loss of all 24 states.

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Fig. 6. Histogram of cross talk of all 24 states.

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Fig. 7. Experimental setup for optical data transmission measurement.

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Fig. 8. Measured eye diagrams of a 25 Gb/s OOK signal before and after the switch chip. (a) BtB transmission, (b) switching state ID=3, and (c) switching state ID=22.

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Fig. 9. Tolerance analysis of power imbalance of the 4×4 and 3×3 MMIs on the cross talk of the device. The triangle represents the simulation of our fabricated device.

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Table 1. All Switching States and Corresponding Power Consumption^a

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Table 1. All Switching States and Corresponding Power Consumption^a

State ID	GM4	GM3	GM2	$O_{1}$	$O_{2}$	$O_{3}$	$O_{4}$	TO Power
1	3	1	0	$I_{3}$	$I_{4}$	$I_{2}$	$I_{1}$	102.31
2	3	1	1	$I_{4}$	$I_{3}$	$I_{2}$	$I_{1}$	124.69
3	3	2	0	$I_{4}$	$I_{2}$	$I_{3}$	$I_{1}$	107.64
4	3	2	1	$I_{2}$	$I_{4}$	$I_{3}$	$I_{1}$	126.96
5	3	3	0	$I_{2}$	$I_{3}$	$I_{4}$	$I_{1}$	107.64
6	3	3	1	$I_{3}$	$I_{2}$	$I_{4}$	$I_{1}$	124.26
7	4	1	0	$I_{1}$	$I_{3}$	$I_{4}$	$I_{2}$	78.73
8	4	1	1	$I_{3}$	$I_{1}$	$I_{4}$	$I_{2}$	101.11
9	4	2	0	$I_{3}$	$I_{4}$	$I_{1}$	$I_{2}$	84.06
10	4	2	1	$I_{4}$	$I_{3}$	$I_{1}$	$I_{2}$	103.38
11	4	3	0	$I_{4}$	$I_{1}$	$I_{3}$	$I_{2}$	81.36
12	4	3	1	$I_{1}$	$I_{4}$	$I_{3}$	$I_{2}$	96.34
13	1	1	0	$I_{4}$	$I_{2}$	$I_{1}$	$I_{3}$	72.16
14	1	1	1	$I_{2}$	$I_{4}$	$I_{1}$	$I_{3}$	94.67
15	1	2	0	$I_{2}$	$I_{1}$	$I_{4}$	$I_{3}$	62.23
16	1	2	1	$I_{1}$	$I_{2}$	$I_{4}$	$I_{3}$	77.21
17	1	3	0	$I_{1}$	$I_{4}$	$I_{2}$	$I_{3}$	62.29
18	1	3	1	$I_{4}$	$I_{1}$	$I_{2}$	$I_{3}$	77.27
19	2	1	0	$I_{2}$	$I_{1}$	$I_{3}$	$I_{4}$	123.53
20	2	1	1	$I_{1}$	$I_{2}$	$I_{3}$	$I_{4}$	145.91
21	2	2	0	$I_{1}$	$I_{3}$	$I_{2}$	$I_{4}$	122.75
22	2	2	1	$I_{3}$	$I_{1}$	$I_{2}$	$I_{4}$	142.07
23	2	3	0	$I_{3}$	$I_{2}$	$I_{1}$	$I_{4}$	126.16
24	2	3	1	$I_{2}$	$I_{3}$	$I_{1}$	$I_{4}$	141.14

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Zuxiang Li, Linjie Zhou, Liangjun Lu, Shuoyi Zhao, Dong Li, Jianping Chen. 4 × 4 nonblocking optical switch fabric based on cascaded multimode interferometers[J]. Photonics Research, 2016, 4(1): 0021

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