Reconfigurable silicon bandpass filters based on cascaded Sagnac loop mirrors

Renyou Ge; Yannong Luo; Shengqian Gao; Ya Han; Ya Han; Lifeng Chen; Xinlun Cai

doi:10.1364/OL.410477

Optics Letters
Vol. 46,
Issue 3,
pp. 580-583
(2021)
•https://doi.org/10.1364/OL.410477

Reconfigurable silicon bandpass filters based on cascaded Sagnac loop mirrors

Renyou Ge, Yannong Luo, Shengqian Gao, Ya Han, Lifeng Chen, and Xinlun Cai

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Renyou Ge, Yannong Luo, Shengqian Gao, Ya Han, Lifeng Chen, and Xinlun Cai, "Reconfigurable silicon bandpass filters based on cascaded Sagnac loop mirrors," Opt. Lett. 46, 580-583 (2021)

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Abstract

We demonstrate a high-performance reconfigurable bandpass filter implemented by cascaded Sagnac loop mirror (SLM)-based coupled resonator optical waveguides (CROWs) on the silicon-on-insulator platform. By dynamic thermal tuning of the reflectivity in each SLM, the proposed filter can achieve simultaneous 3 dB bandwidth tuning from 8.50 to 20.25 GHz and a central wavelength tuning range of 216.25 GHz. A box-like filtering response with an ultra-high extinction ratio up to 70 dB and an ultra-sharp roll-off of 0.61 are observed in a 6th-order SLM-coupled resonator optical waveguide (SLM-CROW). The proposed reconfigurable SLM-CROW filter can satisfy the demand for next-generation flexible-grid WDM networks.

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Device	IL (Theoretical)	ER	Roll-Off
3rd-order	3.1 dB (2.3 dB)	$\sim 40 d B$	0.29
4th-order	5.0 dB (3.0 dB)	$\sim 60 d B$	0.43
5th-order	3.3 dB (3.0 dB)	$\sim 70 d B$	0.50
6th-order	3.5 dB (3.7 dB)	$\sim 70 d B$	0.61

Reference	IL (dB)	FSR (nm)	BW (GHz)	CW (nm)	ER (dB)
[4]	2.8	7.3	11.6–125	0.4	100
[5]	3–4	2.336	14.1–4.1	0.088	30–17.1
[6]	15	9.37	57.5–110	4	30 max
[7]	6	0.273	4.37–27.6	0.285	15.2–3.5
[14]	3.5	2.1	23.5–33.3	0.75	30–24
4th-order	5.0	1.3	8.50–20.25	1.73	55–40
6th-order	3.5	1.3	No demonstration		70

Device	IL (Theoretical)	ER	Roll-Off
3rd-order	3.1 dB (2.3 dB)	$\sim 40 d B$	0.29
4th-order	5.0 dB (3.0 dB)	$\sim 60 d B$	0.43
5th-order	3.3 dB (3.0 dB)	$\sim 70 d B$	0.50
6th-order	3.5 dB (3.7 dB)	$\sim 70 d B$	0.61

Reference	IL (dB)	FSR (nm)	BW (GHz)	CW (nm)	ER (dB)
[4]	2.8	7.3	11.6–125	0.4	100
[5]	3–4	2.336	14.1–4.1	0.088	30–17.1
[6]	15	9.37	57.5–110	4	30 max
[7]	6	0.273	4.37–27.6	0.285	15.2–3.5
[14]	3.5	2.1	23.5–33.3	0.75	30–24
4th-order	5.0	1.3	8.50–20.25	1.73	55–40
6th-order	3.5	1.3	No demonstration		70

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Equations (6)

Optics Letters