Fast All-Optical 4×2 Encoder with High Contrast Based on Two-Dimensional Photonic Crystal

Chang Cai; Zongdan Jiang; Peili Li

doi:10.3788/LOP202259.0114004

Laser & Optoelectronics Progress, Volume. 59, Issue 1, 0114004(2022)

Fast All-Optical 4×2 Encoder with High Contrast Based on Two-Dimensional Photonic Crystal

Chang Cai, Zongdan Jiang, and Peili Li^*

College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts & Telecommunications, Nanjing , Jiangsu 210023, China

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Fig. 1. Structure of Y-type 1×2 beam splitter of two-dimensional photonic crystal. (a) Without microcavity; (b) with microcavity

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Fig. 2. TE mode and TM mode band diagram of complete　photonic crystal

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Fig. 3. Encoding performance of Y-type 1×2 beam splitter without microcavity. (a) Steady-state field intensity distribution; (b) time-domain steady-state response

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Fig. 4. Encoding performance of Y type 1×2 beam splitter with microcavity. (a) Steady-state field intensity distribution; (b) time-domain steady-state response

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Fig. 5. Structure of two-dimensional photonic crystal all-optical 4×2 encoder

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Fig. 6. Encoding performance when 1 is input for I0 and 0 is input for I0, I1, and I3. (a) Steady-state field intensity distribution; (b) time-domain steady-state response

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Fig. 7. Encoding performance when 1 is input for I1 and 0 is input for I0, I2, and I3. (a) Steady-state field intensity distribution; (b) time-domain steady-state response

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Fig. 8. Encoding performance when 1 is input for I2 and 0 is input for I0, I1, and I3. (a) Steady-state field intensity distribution; (b) time-domain steady-state response

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Fig. 9. Encoding performance when 1 is input for I3 and 0 is input for I0, I1, and I2. (a) Steady-state field intensity distribution; (b) time-domain steady-state response

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Table 1. Truth table data and performance parameters of all-optical 4×2 encoder
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Table 1. Truth table data and performance parameters of all-optical 4×2 encoder
I0 I1 I2 I3 Transmittance /% Response time /ps Contrast ratio /dB
V O1 O2
1 0 0 0 97.71 0.02 0.14 0.16 24.55
0 1 0 0 0.01 66.24 0.17 0.14
0 0 1 0 0.02 0.16 64.64 0.14
0 0 0 1 0.08 48.89 48.44 1.11

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Chang Cai, Zongdan Jiang, Peili Li. Fast All-Optical 4×2 Encoder with High Contrast Based on Two-Dimensional Photonic Crystal[J]. Laser & Optoelectronics Progress, 2022, 59(1): 0114004

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