NDLI: Double-structure, bidirectional and polarization-independent subwavelength grating beam splitter

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Double-structure, bidirectional and polarization-independent subwavelength grating beam splitter

Content Provider	Semantic Scholar
Author	Yang, Junbo Zhou, Zhiping
Copyright Year	2012
Abstract	Abstract A novel broadband beam splitter (BS) at a wavelength of 1.55 μm is proposed and demonstrated, which is based on the form birefringence of subwavelength binary blazed grating and effective-medium theory. Rigorous coupled-wave analysis (RCWA) is used to optimize the design of this beam splitter. In order to achieve high coupling efficiency and equal power separation, the grating depth, period and wavelength are optimized, and the double-structure design which consists of symmetrical subwavelength gratings is adopted. Finally, the additional reflectors are also discussed and analyzed. Simulation results for TE polarized wave and TM polarized wave are presented. Using three reflectors, the BS for TE light are designed to split incident light beam into two beams of nearly equal power (41% and 43%), and the power difference of two output ports is less than 3% over a 20 nm wavelength bandwidth range. Simultaneously, the coupling efficiency of TM model for the right and the left branches of waveguide are 33% and 40%, respectively. The power differences of two ports of waveguide are lower than 10% with 80 nm wavelength bandwidth. Both theoretical analysis and simulation results show that the beam splitter designed here has advantages of high coupling efficiency, compact structure and polarization independence.
Starting Page	1494
Ending Page	1500
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1016/j.optcom.2011.10.036
Alternate Webpage(s)	http://spm.pku.edu.cn/upload/fckeditor/2012-03/08095203.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.optcom.2011.10.036
Volume Number	285
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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