Optical Add-Drop Multiplexer for Dense Wavelength Division Multiplexing System Based on Photonic Crystals

Fig. 5. Transmission spectra in dropping process. (a) Simulated transmission spectra of ports 1 and 2; (b) comparison of simulated and theoretical transmission spectra of port 2

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Fig. 6. Transmission spectra in adding process. (a) Simulated transmission spectra when input from port 2; (b) simulated transmission spectra when input from port 3; (c) comparison of simulated and theoretical transmission spectra of port 1

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Fig. 7. Distribution of steady-state field with different operation wavelengths during dropping process. (a) Operation wavelength is 1556.2 nm; (b) operation wavelength is 1555.4 nm

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Fig. 8. Distribution of steady-state field with different operation wavelengths during adding process. (a) Operation wavelength is 1556.2 nm; (b) operation wavelength is 1555.4 nm

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Fig. 9. Relationship between insertion loss and the length of tapered structure $L_{1}$

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Fig. 10. Relationship between insertion loss and the radius of photonic crystal $r$

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Fig. 11. Relationship between insertion loss and the radius of air hole $r_{1}$

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Table 1. Structure parameters of OADM for DWDM system based on photonic crystal
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Table 1. Structure parameters of OADM for DWDM system based on photonic crystal
Parameter Value Parameter Value
$a$ /nm 430 $a_{1}$ /nm 382
r /nm 130 $δ$ /nm 191
$r_{1}$ /nm 36 $r_{2}$ /nm 120
$r_{a 1}$ /nm 90 $r_{b 1}$ /nm 87

Table 2. Insertion loss and crosstalk in dropping/adding processes
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Table 2. Insertion loss and crosstalk in dropping/adding processes
Process 1556.2 nm 1555.4 nm
Insertion loss /dB Crosstalk /dB Insertion loss /dB Crosstalk /dB
Dropping 0.46 -49.51 0.41 -49.73
Adding 0.51 -29.54 0.46 -33.57

Table 3. Comparison of performances between the proposed photonic crystal OADM and existing structures

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Table 3. Comparison of performances between the proposed photonic crystal OADM and existing structures

Ref.	Minimum insertion loss /dB	Minimum crosstalk / dB	Footprint /（μm×μm）	Line width /nm	Q factor
［19］	18	-40	$391 \times 3.6$	3.5	445
［20］	1.46	-	-	1	1541
［21］	-	-38	-	2.6	538
This work	0.41	-49.7	$19.35 \times 13.33$	0.2	7781

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Yuchen Hu, Heming Chen. Optical Add-Drop Multiplexer for Dense Wavelength Division Multiplexing System Based on Photonic Crystals[J]. Acta Optica Sinica, 2023, 43(2): 0223002

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