Abstract

A compact polarization splitter-rotator based on a silicon-on-insulator rib asymmetrical directional coupler with SiO2 top-cladding is proposed. Unlike previously reported PSRs which specifically required the top-cladding material to be different from the bottom cladding in order to break the symmetry of the waveguide cross-section, our proposed PSR has no such limitation on the top-cladding due to the horizontal asymmetry of the rib waveguide. In addition, the device is highly compact and has a total length as short as 24 μm. Numerical simulation shows that a high conversion efficiency of ~97% is obtained at the wavelength of 1550 nm. With the width variation of ± 15 nm and the gap variation of ± 50 nm, the PSR still has high ER of 12 dB at the cross-port, showing large fabrication tolerance. This device can be cascaded to improve the performance at the through port and an example of a two-stage PSR is presented. The mode conversion between the strip waveguide and the rib waveguide is also discussed.

© 2014 Optical Society of America

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References

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2013 (2)

2012 (3)

2011 (2)

2005 (3)

1999 (1)

Baets, R.

Beckx, S.

Bienstman, P.

Bogaerts, W.

Bowers, J. E.

Cao, T.

Cao, Y.

Chen, S.

Dai, D.

Ding, Y.

Dumon, P.

Fan, S.

Fei, Y.

Gan, F.

Haus, H. A.

Hvam, J. M.

Ippen, E. P.

Joannopoulos, J. D.

Johnson, S. G.

Li, H.

Li, L.

Ling, W.

Liu, L.

Luyssaert, B.

Manolatou, C.

Ou, H.

Pang, A.

Peucheret, C.

Qiu, C.

Sheng, Z.

Taillaert, D.

Tang, Y.

Van Campenhout, J.

Van Thourhout, D.

Villeneuve, P. R.

Wang, J.

Wang, X.

Watts, M. R.

Wiaux, V.

Wu, A.

Yvind, K.

Zhang, L.

Zou, S.

Appl. Opt. (1)

J. Lightwave Technol. (3)

Opt. Express (4)

Opt. Lett. (3)

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Figures (6)

Fig. 1
Fig. 1

(a) Schematic of the proposed PSR based on a rib DC. The cross-section of the DC is also presented. (b) Effective indices of the first three modes in a rib waveguide as a function of the waveguide width. Inset: relationship between W1 and W2 when the phase-matching condition is satisfied.

Fig. 2
Fig. 2

Conversion efficiency as a function of (a-b) coupling length (Lc) and (c-d) wavelength. The conversion efficiency below −35 dB is not shown.

Fig. 3
Fig. 3

Mode propagation when the input is (a) the TM0 mode and (b) the TE0 mode. The wavelength is 1550 nm. The PSR has design parameters as follows: W1 = 262 nm, W2 = 500 nm, G = 150 nm, Gout = 1 μm, Lc = 9 μm, Ls = 15μm.

Fig. 4
Fig. 4

Fabrication tolerance analysis for the (a-b) the gap variation ΔG, (c-d) width variation ΔW1 of the narrow waveguide, (e-f) slab height variation and (g-h) variation of the refractive index of the upper-cladding. The conversion efficiency below −35 dB is not shown. The wavelength is 1550 nm.

Fig. 5
Fig. 5

(a) Schematic of the cascaded PSR, which has two DCs with optimal coupling length at 1550 nm and 1600 nm, respectively. (b) The improved conversion efficiency as a function of wavelength. The parameters of this cascaded PSR are shown as follows: W1 = 262 nm, W2 = 500 nm, W3 = 250 nm, G = 150 nm, Gout = 1μm, Lc1 = 11 μm, Lc2 = 7 μm, Ls1 = Ls2 = 15μm.

Fig. 6
Fig. 6

(a) Schematic of the taper between the strip waveguide and the rib waveguide. (b) The transmission as a function of Wside when Ltp = 10 μm. (c) The transmission as a function of wavelength when Wside = 0.3 μm and Ltp = 10 μm.

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