Crosstalk Coherence in Optical Switching Chips

Yu TANG; Baojian WU; Wei YAN; Feng WEN; Kun QIU

doi:10.3788/gzxb20235210.1052418

Acta Photonica Sinica, Volume. 52, Issue 10, 1052418(2023)

Crosstalk Coherence in Optical Switching Chips

Yu TANG... Baojian WU*, Wei YAN, Feng WEN and Kun QIU |Show fewer author(s)

Key Laboratory of Optical Fiber Sensing and Communications，Ministry of Education，University of Electronic Science and Technology of China，Chengdu 611731，China

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Abstract Get PDF(in Chinese)

Figures & Tables(8)

Fig. 1. Structural diagram of 2×2 MZI optical switch

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Fig. 2. Dependences of a_iand_{b_i}on the beam splitting errors

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Fig. 3. 4×4 Benes optical switch array

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Fig. 4. Performance simulation of the 4×4 optical switching chip

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Fig. 5. Experimental setup

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Fig. 6. Curves of BER versus crosstalk

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Table 1. Intensity fluctuation of coherent light beams

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Table 1. Intensity fluctuation of coherent light beams

State of m₁₂ and m₂₂	Coherent light beams		Intensity fluctuation
Identical	Main path signal（aaa）	Side path signal（bab）	a⁶±2a⁴b²
Identical	1st-order crosstalk（aab）	1st-order crosstalk（baa）	2a⁴b²±2a⁴b²
Identical	1st-order crosstalk（aba）	3rd-order crosstalk（bbb）	a⁴b²±2a²b⁴
Identical	2nd-order crosstalk（abb）	2nd-order crosstalk（abb）	2a²b⁴±2a²b⁴
Different	Main path signal（aaa）	Side path signal（bbb）	a⁶±2a³b³
Different	1st-order crosstalk（aab）	2nd-order crosstalk（bba）	a⁴b²±2a³b³
Different	1st-order crosstalk（aba）	2nd-order crosstalk（bab）	a⁴b²±2a³b³
Different	1st-order crosstalk（baa）	2nd-order crosstalk（abb）	a⁴b²±2a³b³

Table 2. Crosstalk coherence for different switching requests

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Table 2. Crosstalk coherence for different switching requests

Switching requests	State of m₁₂ and m₂₂
1 234、1 243、2 134、2 143、3 412、3 421、4 312、4 321	Identical（strongly coherent）
1 324、1 342、1 423、1 432、2 314、2 341、2 413、2 431	Different（weakly coherent）
3 124、3 142、3 214、3 241、4 123、4 132、4 213、4 231	Different（weakly coherent）