Silicon-Nanowire-Type Polarization-Diversified CWDM Demultiplexer for Low Polarization Crosstalk

Overview

Journal Nanomaterials (Basel)

Date 2023 Aug 26

PMID 37630967

Authors

Seok-Hwan Jeong

Heuk Park

Joon Ki Lee

Affiliations

Soon will be listed here.

Abstract

Coarse wavelength division multiplexing (CWDM)-targeted novel silicon (Si)-nanowire-type polarization-diversified optical demultiplexers were numerically analyzed and experimentally verified. The optical demultiplexer comprised a hybrid mode conversion-type polarization splitter rotator (PSR) and a delayed Mach-Zehnder interferometric demultiplexer. Si-nanowire-based devices were fabricated using a commercially available Si photonics foundry process, exhibiting nearly identical spectral responses regardless of the polarization states of the input signals under the PSR. The experiment demonstrated a low insertion loss of 1.0 dB and a polarization-dependent loss of 1.0 dB, effectively suppressing spectral crosstalk from other channels by less than -15 dB. Furthermore, a TM-mode rejection-filter-integrated optical demultiplexer was designed and experimentally validated to mitigate unwanted TM-mode-related polarization crosstalk that arose from the PSR. It exhibited an improved polarization crosstalk rejection efficiency of -25 dB to -50 dB within the whole CWDM spectral range.

References

Xu H, Liu L, Shi Y . Polarization-insensitive four-channel coarse wavelength-division (de)multiplexer based on Mach-Zehnder interferometers with bent directional couplers and polarization rotators. Opt Lett. 2018; 43(7):1483-1486. DOI: 10.1364/OL.43.001483. View

Gao G, Chen D, Tao S, Zhang Y, Zhu S, Xiao X . Silicon nitride O-band (de)multiplexers with low thermal sensitivity. Opt Express. 2017; 25(11):12260-12267. DOI: 10.1364/OE.25.012260. View

Gifford D, Soller B, Wolfe M, Froggatt M . Optical vector network analyzer for single-scan measurements of loss, group delay, and polarization mode dispersion. Appl Opt. 2005; 44(34):7282-6. DOI: 10.1364/ao.44.007282. View

Xu H, Dai D, Shi Y . Low-crosstalk and fabrication-tolerant four-channel CWDM filter based on dispersion-engineered Mach-Zehnder interferometers. Opt Express. 2021; 29(13):20617-20631. DOI: 10.1364/OE.428352. View

Mikkelsen J, Bois A, Lordello T, Mahgerefteh D, Menezo S, Poon J . Polarization-insensitive silicon nitride Mach-Zehnder lattice wavelength demultiplexers for CWDM in the O-band. Opt Express. 2018; 26(23):30076-30084. DOI: 10.1364/OE.26.030076. View

Sacher W, Barwicz T, Taylor B, Poon J . Polarization rotator-splitters in standard active silicon photonics platforms. Opt Express. 2014; 22(4):3777-86. DOI: 10.1364/OE.22.003777. View

Morichetti F, Milanizadeh M, Petrini M, Zanetto F, Ferrari G, de Aguiar D . Polarization-transparent silicon photonic add-drop multiplexer with wideband hitless tuneability. Nat Commun. 2021; 12(1):4324. PMC: 8282818. DOI: 10.1038/s41467-021-24640-5. View

Jeong S . Theoretical verification of a silicon-wire flat-spectral-band wavelength filter based on multimode interference couplers with symmetric and asymmetric splitting ratios for the broadband operating range. Appl Opt. 2021; 60(30):9411-9418. DOI: 10.1364/AO.437694. View

Gehl M, Trotter D, Starbuck A, Pomerene A, Lentine A, DeRose C . Active phase correction of high resolution silicon photonic arrayed waveguide gratings. Opt Express. 2017; 25(6):6320-6334. DOI: 10.1364/OE.25.006320. View

10.

Jeong S, Tanaka Y . Silicon-wire optical demultiplexers based on multistage delayed Mach-Zehnder interferometers for higher production yield. Appl Opt. 2018; 57(22):6474-6480. DOI: 10.1364/AO.57.006474. View

11.

Kumar R, Tsang H . High-extinction CROW filters for scalable quantum photonics. Opt Lett. 2020; 46(1):134-137. DOI: 10.1364/OL.409784. View

12.

Xu H, Shi Y . Ultra-broadband silicon polarization splitter-rotator based on the multi-mode waveguide. Opt Express. 2017; 25(15):18485-18491. DOI: 10.1364/OE.25.018485. View

13.

Absil P, Verheyen P, Heyn P, Pantouvaki M, Lepage G, De Coster J . Silicon photonics integrated circuits: a manufacturing platform for high density, low power optical I/O's. Opt Express. 2015; 23(7):9369-78. DOI: 10.1364/OE.23.009369. View

14.

Horst F, Green W, Assefa S, Shank S, Vlasov Y, Offrein B . Cascaded Mach-Zehnder wavelength filters in silicon photonics for low loss and flat pass-band WDM (de-)multiplexing. Opt Express. 2013; 21(10):11652-8. DOI: 10.1364/OE.21.011652. View

15.

Maegami Y, Okano M, Cong G, Ohno M, Yamada K . Completely CMOS compatible SiN-waveguide-based fiber coupling structure for Si wire waveguides. Opt Express. 2016; 24(15):16856-65. DOI: 10.1364/OE.24.016856. View

16.

Guerber S, Alonso-Ramos C, Le Roux X, Vulliet N, Cassan E, Marris-Morini D . Polarization independent and temperature tolerant AWG based on a silicon nitride platform. Opt Lett. 2020; 45(23):6559-6562. DOI: 10.1364/OL.411332. View