Abstract

We report what is to our knowledge the first optimization of a spot size transformer by use of a periodically segmented waveguide for photonic integrated circuits based on InP. It is shown that a nonlinear variation of the segmentation ratio along the propagation direction allows one to make an adiabatic transition of a short length. A simple method based on the study of a beveled edge transition is presented for the optimization of such a device. Internal losses in the transition region as low as 1.2 dB are obtained between a coupling waveguide and a simple heterostructure waveguide, with a very high transition spot size expansion factor.

© 1995 Optical Society of America

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References

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  1. R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
    [CrossRef]
  2. G. Müller, B. Stegmüller, H. Westermeier, G. Wenger, Electron. Lett. 27, 1836 (1991).
    [CrossRef]
  3. Z. Weissman, A. Hardy, Electron. Lett. 28, 1514 (1992).
    [CrossRef]
  4. L. Li, J. J. Burke, Opt. Lett. 17, 1195 (1992).
    [CrossRef] [PubMed]
  5. Z. Weissman, A. Hardy, J. Lightwave Technol. 11, 1831 (1993).
    [CrossRef]
  6. K. Thyagarajan, C. W. Chien, R. V. Ramaswany, H. S. Kim, H. C. Cheng, Opt. Lett. 19, 880 (1994).
    [CrossRef] [PubMed]
  7. B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).
  8. BPM-CNET (ALCOR) software developed and distributed by France Telecom/CNET, Bagneux Cedex, France.
  9. F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
    [CrossRef]

1994 (3)

K. Thyagarajan, C. W. Chien, R. V. Ramaswany, H. S. Kim, H. C. Cheng, Opt. Lett. 19, 880 (1994).
[CrossRef] [PubMed]

B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).

F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
[CrossRef]

1993 (1)

Z. Weissman, A. Hardy, J. Lightwave Technol. 11, 1831 (1993).
[CrossRef]

1992 (2)

Z. Weissman, A. Hardy, Electron. Lett. 28, 1514 (1992).
[CrossRef]

L. Li, J. J. Burke, Opt. Lett. 17, 1195 (1992).
[CrossRef] [PubMed]

1991 (1)

G. Müller, B. Stegmüller, H. Westermeier, G. Wenger, Electron. Lett. 27, 1836 (1991).
[CrossRef]

1989 (1)

R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
[CrossRef]

Brandon, J.

F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
[CrossRef]

B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).

Burke, J. J.

Carenco, A.

F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
[CrossRef]

B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).

Cheng, H. C.

Chien, C. W.

Deri, R. J.

R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
[CrossRef]

Ghirardi, F.

F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
[CrossRef]

B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).

Hardy, A.

Z. Weissman, A. Hardy, J. Lightwave Technol. 11, 1831 (1993).
[CrossRef]

Z. Weissman, A. Hardy, Electron. Lett. 28, 1514 (1992).
[CrossRef]

Hervé-Gruyer, G.

B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).

F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
[CrossRef]

Kim, H. S.

Kuramata, A.

R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
[CrossRef]

Li, L.

Makiuchi, M.

R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
[CrossRef]

Mersali, B.

F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
[CrossRef]

B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).

Müller, G.

G. Müller, B. Stegmüller, H. Westermeier, G. Wenger, Electron. Lett. 27, 1836 (1991).
[CrossRef]

Ramaswany, R. V.

Stegmüller, B.

G. Müller, B. Stegmüller, H. Westermeier, G. Wenger, Electron. Lett. 27, 1836 (1991).
[CrossRef]

Thyagarajan, K.

Wada, O.

R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
[CrossRef]

Weissman, Z.

Z. Weissman, A. Hardy, J. Lightwave Technol. 11, 1831 (1993).
[CrossRef]

Z. Weissman, A. Hardy, Electron. Lett. 28, 1514 (1992).
[CrossRef]

Wenger, G.

G. Müller, B. Stegmüller, H. Westermeier, G. Wenger, Electron. Lett. 27, 1836 (1991).
[CrossRef]

Westermeier, H.

G. Müller, B. Stegmüller, H. Westermeier, G. Wenger, Electron. Lett. 27, 1836 (1991).
[CrossRef]

Yasuka, N.

R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
[CrossRef]

Appl. Phys. Lett. (1)

R. J. Deri, N. Yasuka, M. Makiuchi, A. Kuramata, O. Wada, Appl. Phys. Lett. 55, 1495 (1989).
[CrossRef]

Electron. Lett. (2)

G. Müller, B. Stegmüller, H. Westermeier, G. Wenger, Electron. Lett. 27, 1836 (1991).
[CrossRef]

Z. Weissman, A. Hardy, Electron. Lett. 28, 1514 (1992).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

F. Ghirardi, B. Mersali, J. Brandon, G. Hervé-Gruyer, A. Carenco, IEEE Photon. Technol. Lett. 6, 522 (1994).
[CrossRef]

J. Lightwave Technol. (1)

Z. Weissman, A. Hardy, J. Lightwave Technol. 11, 1831 (1993).
[CrossRef]

Opt. Lett. (2)

Proc. Inst. Electr. Eng. Part J (1)

B. Mersali, F. Ghirardi, J. Brandon, G. Hervé-Gruyer, A. Carenco, Proc. Inst. Electr. Eng. Part J 5, 286 (1994).

Other (1)

BPM-CNET (ALCOR) software developed and distributed by France Telecom/CNET, Bagneux Cedex, France.

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Figures (5)

Fig. 1
Fig. 1

Adiabatic transition made from a periodically segmented SH waveguide in which the segmented ratio Γ/Λ is variable between a coupling waveguide using diluted quantum wells7 and a SH waveguide.

Fig. 2
Fig. 2

Optical field overlap figures between the SH waveguide of dSH = 0.65 μm and a SH waveguide of dQ varying from dSH to 0-μm thickness.

Fig. 3
Fig. 3

Curve a: Profile of the vertical tapered transition for which the transformation of the guiding mode along the propagation axis z is linear. Curve b: Function Γ/Λ = f(z), which conserves the linear transformation of the mode in the propagation direction z given by curve a.

Fig. 4
Fig. 4

Internal losses versus the transition length in the case of the computed nonlinear tapering function. For length values >150 μm, the transition features adiabatic behavior.

Fig. 5
Fig. 5

Internal losses versus the transition length in the case of a linear tapering function.

Equations (2)

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V = 2 π λ S d SH n GSP 2 n InP 2 = 2 π λ S d Q n Q 2 n InP 2 ,
n GSP = n Q ( 1 Γ Λ ) + n InP Γ Λ ,

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