Short Waveguide Polarization Converter Operating Over a Wide Wavelength Range

Autor:	Hisamatsu Nakano, Junji Yamauchi, T. Hashimoto, Yuu Wakabayashi
Rok vydání:	2013
Předmět:	Physics Wavelength Optics Extinction ratio business.industry Finite-difference time-domain method Insertion loss Wideband Polarization (waves) business Waveguide (optics) Refractive index Atomic and Molecular Physics and Optics
Zdroj:	Journal of Lightwave Technology. 31:1544-1550
ISSN:	1558-2213 0733-8724
DOI:	10.1109/jlt.2013.2253445
Popis:	A simple polarization converter using an L-figured waveguide is analyzed by the imaginary-distance beam-propagation method based on Yee's mesh and the finite-difference time-domain method. It is revealed at a wavelength of 1.55 μm that the polarization conversion length is 3.24 μm with an insertion loss of 0.46 dB. To achieve a wideband operation, we determine a device length by the effective index difference between the two eigenmodes generated in the L-figured waveguide. As a result, an extinction ratio of more than 20 dB is obtained over a wide wavelength range of 1.3 to 1.6 μ m. Finally, to reduce the insertion loss, we propose a modified structure, in which two corners in a diagonal position are cut with an angle of 90°.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dce2d59f4ef16f4344b67b9cac1e97b4 https://doi.org/10.1109/jlt.2013.2253445 Zobrazit plný text záznamu