Polarization-insensitive 1D unidirectional compact grating coupler for the C-band using a 500 nm SOI

Muhammad Shemyal Nisar; Liangjun Lu; Liangjun Lu

doi:10.1364/AO.467431

Applied Optics
Vol. 61,
Issue 25,
pp. 7373-7379
(2022)
•https://doi.org/10.1364/AO.467431

Polarization-insensitive 1D unidirectional compact grating coupler for the C-band using a 500 nm SOI

Muhammad Shemyal Nisar and Liangjun Lu

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Muhammad Shemyal Nisar and Liangjun Lu, "Polarization-insensitive 1D unidirectional compact grating coupler for the C-band using a 500 nm SOI," Appl. Opt. 61, 7373-7379 (2022)

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Abstract

Grating couplers are an important optical interconnect and have increasingly found their utility in sensing and LIDARs as well. Optical systems in general have been struggling to increase their bandwidths, making polarization insensitivity highly desirable. The standard 220 nm silicon-on-insulator (SOI) platform used for integrated photonics suffers from physical bottlenecks in the form of large modal differences in effective refractive index, propagation loss, and dispersion. In this paper, we present a grating coupler for polarization-insensitive coupling with polarization-dependent loss of less than 0.2 dB for more than 80% of the C-band on an alternative 500 nm SOI platform. We further show that the same design can be extended to polarization inflexible coupling and can reduce the polarization-dependent loss to less than 0.08 dB for the complete C-band. This platform is devoid of shortcomings, making it better suited for polarization-insensitive photonics, and the coupler is able to achieve these results through a simple and compact 1D design.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Refs.	CE (dB)	PDL (dB)	Band	Year	Remarks
[10]	−7	0.5	C	2015	1D non-uniform grating on SOI
[26]	−3.7	0.2	C	2016	2D GC on SOI
[14]	−1.4	1	C	2018	2D GC on SOI with gold reflector
[15]	−3.46	0.2	C	2019	2D GC on SOI
[27]	−2.4	0.8	C	2019	2D GC on 220 nm SOI
[13]	−1.9	0.04	C	2020	4 port 2D apodized GC
[28]	−1.87	0.2	C	2021	2D apodized GC on SOI
[18]	−0.22	0.1	C	2021	Double layered parallel GC
[29]	−4.86	—	C	2021	Polarization flexible 1D GC on 220 nm SOI
[30]	−1.9	0.6	C	2020	Dual-band GC with SWG
This work	−2.2	0.3	C	2022	1D GC on 500 nm SOI
This work	−2.4	0.08	C	2022	Polarization flexible 1D GC on 500 nm SOI
[30]	−4.3	0.2	O	2020	Dual-band GC with SWG
[31]	−4.3	0.2	O	2018	2D with bottom metal mirror
[32]	−3	3	O	2018	2D-GC with cross-shaped scatterers
[33]	−4.7	2.5	O	2022	1D-GC with zero-birefringence corelet waveguide

Refs.	CE (dB)	PDL (dB)	Band	Year	Remarks
[10]	−7	0.5	C	2015	1D non-uniform grating on SOI
[26]	−3.7	0.2	C	2016	2D GC on SOI
[14]	−1.4	1	C	2018	2D GC on SOI with gold reflector
[15]	−3.46	0.2	C	2019	2D GC on SOI
[27]	−2.4	0.8	C	2019	2D GC on 220 nm SOI
[13]	−1.9	0.04	C	2020	4 port 2D apodized GC
[28]	−1.87	0.2	C	2021	2D apodized GC on SOI
[18]	−0.22	0.1	C	2021	Double layered parallel GC
[29]	−4.86	—	C	2021	Polarization flexible 1D GC on 220 nm SOI
[30]	−1.9	0.6	C	2020	Dual-band GC with SWG
This work	−2.2	0.3	C	2022	1D GC on 500 nm SOI
This work	−2.4	0.08	C	2022	Polarization flexible 1D GC on 500 nm SOI
[30]	−4.3	0.2	O	2020	Dual-band GC with SWG
[31]	−4.3	0.2	O	2018	2D with bottom metal mirror
[32]	−3	3	O	2018	2D-GC with cross-shaped scatterers
[33]	−4.7	2.5	O	2022	1D-GC with zero-birefringence corelet waveguide

Abstract

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Applied Optics