Ultra-Broadband Tunable Filter Based on Cascaded Chirped Subwavelength Grating Assisted Contra-Directional Coupler

Shasha Liao; Hang Bao; Yuting Feng; Cong Huang; Wuhao Zhang; Shuai Zhao; Zhenwei Liu

doi:10.3788/AOS202242.1405003

Acta Optica Sinica, Volume. 42, Issue 14, 1405003(2022)

Ultra-Broadband Tunable Filter Based on Cascaded Chirped Subwavelength Grating Assisted Contra-Directional Coupler

Shasha Liao^1,2、*, Hang Bao¹, Yuting Feng¹, Cong Huang¹, Wuhao Zhang¹, Shuai Zhao¹, and Zhenwei Liu¹

¹School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

²State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China

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Figures & Tables(11)

Fig. 1. Structural diagram of grating-assisted contra-directional coupler

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Fig. 2. Transmission spectra of grating-assisted contra-directional coupler

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Fig. 3. Structural diagrams of devices. (a) WG and SWG; (b) SWG-assisted contra-directional coupler

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$Comparison of WG and SWG. (a) Effective refractive index; (b) distribution of electric field intensity$

Fig. 4. Comparison of WG and SWG. (a) Effective refractive index; (b) distribution of electric field intensity

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Fig. 5. Transmission spectra of SWG-CDC

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Fig. 6. Transmission spectra of chirped SWG-CDC. (a) Spectrum of drop port varying with C; (b) transmission spectra of filter when C is 5.88×10^-3 nm

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Fig. 7. Structural diagram of tunable filter

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Fig. 8. Transmission spectra of waveguide crossing

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Fig. 9. Transmission spectra of tunable filter. (a) Spectra of unheated chirped SWG-CDCs; (b) spectra of chirped SWG-CDCs when temperature increases 50 ℃

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Table 1. Performance comparison of different broadband filter schemes
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Table 1. Performance comparison of different broadband filter schemes
Scheme Length /µm Maximum bandwidth /nm Insertion loss /dB Sidelobe suppression ratio /dB
Ref.［15］ ~422 32.60 0.26 19.0
Ref.［16］ ~4700 88.10 1.77 9.7
Ref.［20］ ~800 16.00 0.60
Proposed ~400 64.07 0.60 10.5

Table 2. Performance comparison of different tunable filter schemes

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Table 2. Performance comparison of different tunable filter schemes

Scheme	Length /µm	Width /µm	Maximum bandwidth /nm	Insertion loss /dB	Sidelobe suppression ratio /dB	Bandwidth tunability /nm
Ref.［8］	~30	40	6.30	1.41	92.35	2.70-6.30
Ref.［11］			1.44	0.60	15.00	0.16-1.44
Ref.［13］	~800		13.00	2.00	30.00	1.00-13.00
Ref.［14］	~730		11.70	2.60	31.00	1.10-11.70
Proposed	~400	48	48.92	1.00	6.80	44.30-48.92

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Shasha Liao, Hang Bao, Yuting Feng, Cong Huang, Wuhao Zhang, Shuai Zhao, Zhenwei Liu. Ultra-Broadband Tunable Filter Based on Cascaded Chirped Subwavelength Grating Assisted Contra-Directional Coupler[J]. Acta Optica Sinica, 2022, 42(14): 1405003

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