Abstract

A novel polarization beam splitter using a two-layer grating coupler is proposed and demonstrated. It can directly couple the normally incident light from fiber into two separate waveguides according to their polarization states while splitting them. It realizes high coupling efficiency and a good extinction ratio by using binary blazed grating couplers. The coupling length is less than 14μm. The extinction ratio is better than 20dB for both polarizations over a 40nm wavelength range, and the coupling efficiencies for the two layers are 58% and 50%.

© 2007 Optical Society of America

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2003 (2)

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[CrossRef]

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[CrossRef]

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[CrossRef] [PubMed]

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Xu, F.

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Zhou, L.

Appl. Opt. (2)

IEEE Photon. Technol. Lett. (4)

C. F. R. Mateus, M. C. Y. Huang, L. Chen, C. J. Chang-Hasnain, and Y. Suzuki, IEEE Photon. Technol. Lett. 16, 1676 (2004).
[CrossRef]

I. Kiyat, A. Aydinli, and N. Dagli, IEEE Photon. Technol. Lett. 17, 100 (2005).
[CrossRef]

P.-K. Wei and W.-S. Wang, IEEE Photon. Technol. Lett. 6, 245 (1994).
[CrossRef]

D. Taillaert, H. Chong, P. I. Borel, L. H. Frandsen, R. M. De La Rue, and R. Beats, IEEE Photon. Technol. Lett. 15, 1249 (2003).
[CrossRef]

J. Opt. Soc. Am. A (3)

Opt. Lett. (6)

Proc. SPIE (2)

S. Kitagawa, K. Yamamoto, and M. Okada, Proc. SPIE 5720, 269 (2005).
[CrossRef]

S. Eckhardt, C. Bruzzone, D. Aastuen, and J. Ma, Proc. SPIE 5002, 106 (2003).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Schematic of a two-layer grating coupler as a PBS: (a) upper grating coupler for the TE mode, (b) spacer between two couplers, (c) lower grating coupler for the TM mode, (d) SiO 2 spacer, (e) Si substrate.

Fig. 2
Fig. 2

Effective refractive index of the TE mode (solid curve) and TM mode (dashed curve) as a function of fill factor under the condition n 1 = 1 , n g = 3.5 .

Fig. 3
Fig. 3

Calculated values of coupled (dashed curve) and transmitted (solid curve) efficiencies of upper layer grating coupler for the TE polarization and TM polarization as a function of angle of incidence.

Fig. 4
Fig. 4

Extinction ratio for each layer as a function of wavelength.

Fig. 5
Fig. 5

Simulation results of (a) TE input and (b) TM input.

Equations (2)

Equations on this page are rendered with MathJax. Learn more.

T g N ± T g n sin θ = λ ,
n e f f T E = [ f n g 2 + ( 1 f ) n 1 2 ] 1 2 , 1 n e f f T M = [ f n g 2 + 1 f n 1 2 ] 1 2

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