We describe a hybrid laser structure which consists of an amplifying III-V waveguide proximity-coupled to a passive Si waveguide. By operating near the synchronism point (where the phase velocities of the individual waveguides are equal), we can cause the optical power to be confined to any of the two waveguides. This is accomplished by control of waveguides’ geometry. In the portion of the supermode resonator where amplification takes place, the mode is confined nearly completely to III-V guide thus realizing a near maximal gain. Near the output facet, the mode power is confined to the Si waveguide thus optimizing the output coupling. This is to be contrasted with approaches which depend on evanescent field penetration into the III-V medium to obtain gain.

© 2007 Optical Society of America

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  1. O. Boyraz and B. Jalali, "Demonstration of a silicon Raman laser," Opt. Express 12, 5269-5273 (2004).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]

2006 (1)

2004 (1)

1984 (1)

Bowers, J. E.

Boyraz, O.

Cohen, O.

Fang, A. W.

Jalali, B.

Jones, R.

Kapon, E.

Katz, J.

Paniccia, M. J.

Park, H.

Yariv, A.

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Figures (3)

Fig. 1.
Fig. 1.

A schematic representation of the two supermodes E o and E e for three values of the mismatch parameter δ.

Fig. 2.
Fig. 2.

A schematic representation of the laser structure with one tapered adiabatic transition. See Fig. 3(a) for definition of the directions x, y, z with relation to waveguide geometry.

Fig. 3.
Fig. 3.

(a). A cross-section of the Si (bottom) – AlGaInAs (top) structure. The top III-V waveguide mesa width=3.34 µm. Si waveguide height H=0.80 µm. (b), (c) and (d) are the optical field profiles (color coded) for the cases δ>0 (W=0.84 µm), δ=0 (W=0.99 µm), and δ<0 (W=1.20 µm), respectively. The fraction of the energy in each waveguide is given at the bottom of each colorgram.

Equations (7)

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E ( x , y , z ) = [ au 1 ( x , y ) + bu 2 ( x , y ) ] e i β z .
E o ( z ) = b a o e i β o z = * δ + S 1 e i ( β ¯ S ) z
E e ( z ) = b a e e i β e z = * δ S 1 e i ( β ¯ + S ) z
2 β ¯ = β 1 + β 2 , 2 δ = β 2 β 1 , S = δ 2 + κ 2 ,
b a o 1 ε , b a e ε 1
b a o 1 1 , b a e 1 1
b a o ε 1 , b a e 1 ε