Abstract

In this paper, we present the design of a SiON-based grating-assisted codirectional coupler for dissimilar waveguides, based on an accurate numerical method. All the design parameters, including coupling length and coupling efficiency, have been calculated at the free-space optical wavelength of λ =1.54 μm for both TE and TM polarisations as a function of grating height, thickness of the coupled slabs, gap thickness between the two coupled planar waveguides. It is shown that efficient (up to 70%) and polarisation independent vertical couplers can be realised.

© 2006 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

Electron. Lett. (1)

L. L. Buhl, R. C. Alferness, U. Koren, B. I. Miller, M. G. Young, T. L. Koch, C. A. Burrus, and G. Raybon, “Grating assisted vertical coupler/filter for extended tuning range,” Electron. Lett. 29, 81 (1993).
[CrossRef]

IBM J. Res. Dev. (1)

G. L. Bona, R. Germann, and B. J. Offrein, “SiON high-refractive-index waveguide and planar lightwave circuits,” IBM J. Res. Dev. 47, 239 (2003).
[CrossRef]

J. Lightwave Technol. (2)

V. M. N. Passaro, “Optimal design of grating-assisted directional couplers,” J. Lightwave Technol. 18, 973 (2000).
[CrossRef]

W. Huang and J. Hong, “Transfer matrix approach based on local normal modes for coupled waveguides with periodic perturbations,” J. Lightwave Technol. 10, 1367 (1992).
[CrossRef]

Opt. Express (1)

Opt. Lett. (1)

Proc. SPIE (1)

G. Z. Masanovic, G. T. Reed, V. M. N. Passaro, W. Headley, M. R. Josey, G. J. Ensell, R. M. H. Atta, and A. G. R. Evans, “A grating based coupler for fibre to silicon waveguide excitation,” in Integrated Optics and Photonic Integrated Circuits, G. C. Righini and S. Honkanen, eds., Proc. SPIE 5451, 381 (2004).
[CrossRef]

Sens. Actuators A (1)

K. Worhoff, A. Driessen, P. V. Lambeck, L. T. H. Hilderink, P. W. C. Linders, and Th. J. A. Popma, “Plasma enhanced chemical vapor deposition silicon oxynitride optimized for application in integrated optics,” Sens. Actuators A 74, 9 (1999).
[CrossRef]

Other (1)

G. T. Reed and A. P. Knights, Silicon photonics: an introduction (Wiley, Chichester, 2004).
[CrossRef]

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Figures (10)

Fig. 1.
Fig. 1.

GADC used for fibre-photodetector coupling in an integrated optical architecture.

Fig. 2.
Fig. 2.

Main parameters of SiON-based GADC.

Fig. 3.
Fig. 3.

Coupling efficiency versus gap thickness for d1= 3μm.

Fig. 4.
Fig. 4.

Coupling length versus gap thickness.

Fig. 5.
Fig. 5.

Grating period versus gap thickness for various grating depths.

Fig. 6.
Fig. 6.

Coupling efficiency/length ratio versus gap thickness.

Fig. 7.
Fig. 7.

Coupling efficiency versus slab 1 thickness.

Fig. 8.
Fig. 8.

Coupling length versus slab 1 thickness.

Fig. 9.
Fig. 9.

Resonance grating period versus slab 1 thickness.

Fig. 10.
Fig. 10.

Coupling efficiency/length ratio versus slab 1 thickness.

Tables (2)

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Table 1. Fabrication tolerances for slab 1 index.

Tables Icon

Table 2. Fabrication tolerances for slab 2 index

Equations (3)

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Λ = 2 π min β A β B 2 π Λ
Λ = λ [ n eff ( even ) n eff ( odd ) ]
Δ λ λ o = 0.8 Λ L [ 1 Λ Δ N ( λ ) λ λ = λ o ]

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