Ultrahigh Suppression Broadband Polarization Splitter Based on an Asymmetrical Directional Coupler

Polarization-beam-splitters with both broadband operation window and high extinction ratio are highly desirable in optical communication systems. In this paper, a compact noncascaded-directional-couplers PBS with an ultrahigh extinction ratio and low excess loss is proposed. The PBS utilizes an asymmetrical directional coupling structure consisted of a TE-pass-polarizer waveguide and a TE- and TM-pass waveguide. The simulation results show that the extinction ratio is up to 35.41 dB and the excess loss is only 0.11 dB around the central wavelength 1550 nm for both polarizations (TE and TM). Meanwhile, when the extinction ratio is 30, 25, and 20 dB, the corresponding bandwidth is 72, 145, and 188 nm, respectively. Also, the EL is 1 and 0.5 dB in a bandwidth of ∼73 and ∼48 nm, respectively. A fabrication tolerance of ±10 nm for the waveguide width is also achieved.

[1]  Xingjun Wang,et al.  CMOS-compatible and fabrication-tolerant MMI-based polarization beam splitter , 2015 .

[2]  Detailed investigation of self-imaging in multimode photonic crystal waveguides for applications in power and polarization beam splitters , 2012 .

[3]  Nicolas A. F. Jaeger,et al.  Wideband silicon photonic polarization beamsplitter based on point-symmetric cascaded broadband couplers. , 2015, Optics express.

[4]  John E Bowers,et al.  Ultrashort broadband polarization beam splitter based on an asymmetrical directional coupler. , 2011, Optics letters.

[5]  R. Hanfoug,et al.  A Compact Integrated Polarization Splitter/Converter in InGaAsP–InP , 2007, IEEE Photonics Technology Letters.

[6]  Sang-Yung Shin,et al.  Ultrashort Polarization Splitter Using Two-Mode Interference in Silicon Photonic Wires , 2009, IEEE Photonics Technology Letters.

[7]  Qian Wang,et al.  Ultracompact TM-Pass Silicon Nanophotonic Waveguide Polarizer and Design , 2010, IEEE Photonics Journal.

[8]  J. Bowers,et al.  Passive technologies for future large-scale photonic integrated circuits on silicon: polarization handling, light non-reciprocity and loss reduction , 2012, Light: Science & Applications.

[9]  Daoxin Dai,et al.  Low-loss ultracompact transverse-magnetic-pass polarizer with a silicon subwavelength grating waveguide. , 2014, Optics letters.

[10]  Suntak Park,et al.  Vertical polarization beam splitter using a hybrid long-range surface plasmon polariton waveguide , 2014 .

[11]  Yikai Su,et al.  High-extinction-ratio silicon polarization beam splitter with tolerance to waveguide width and coupling length variations. , 2016, Optics express.

[12]  Daoxin Dai,et al.  Ultra-broadband high-performance polarizing beam splitter on silicon. , 2017, Optics express.

[13]  Ting Hu,et al.  Compact polarization splitter based on silicon grating-assisted couplers. , 2015, Optics letters.

[14]  Robert G. Hunsperger,et al.  Integrated optics, theory and technology , 1982 .

[15]  Zhiping Zhou,et al.  Polarization beam splitter using a binary blazed grating coupler. , 2007, Optics letters.

[16]  Mohamed Farhat O. Hameed,et al.  Proposal of an Ultracompact CMOS-Compatible TE-/TM-Pass Polarizer Based on SoI Platform , 2014, IEEE Photonics Technology Letters.

[17]  J. Bowers,et al.  Novel ultra-short and ultra-broadband polarization beam splitter based on a bent directional coupler. , 2011, Optics express.

[18]  D. Trotter,et al.  An adiabatic/diabatic polarization beam splitter , 2016, 2016 IEEE Optical Interconnects Conference (OI).

[19]  Henry I. Smith,et al.  Polarization-transparent microphotonic devices in the strong confinement limit , 2007 .