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Optics Letters

Optics Letters


  • Vol. 13, Iss. 6 — Jun. 1, 1988
  • pp: 455–457

Modal coupling in tilted-mirror waveguide lasers and amplifiers

Joseph Salzman, Raymond J. Hawkins, and T. P. Lee  »View Author Affiliations

Optics Letters, Vol. 13, Issue 6, pp. 455-457 (1988)

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Tilted-mirror facets have been introduced as a design alternative to antireflection coating for waveguide structures that require low facet reflectivity. We show that tilted-mirror facets with finite reflectivity can induce significant intermode coupling in semiconductor lasers and optical amplifiers. We describe the effect of tilt-induced intermode coupling on the cavity modes using a simple model and discuss the implications of our results on the design of tilted-mirror integrated-optical lasers and amplifiers.

© 1988 Optical Society of America

Original Manuscript: September 22, 1987
Manuscript Accepted: March 3, 1988
Published: June 1, 1988

Joseph Salzman, Raymond J. Hawkins, and T. P. Lee, "Modal coupling in tilted-mirror waveguide lasers and amplifiers," Opt. Lett. 13, 455-457 (1988)

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  15. In writing Eq. (1) it is assumed that the waveguide is sufficiently long that leaky and radiation modes are strongly attenuated and can be ignored. The transverse y dependence of the field can be eliminated by an effective-index approximation.
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  18. The values of Kij depend on the modal profiles. For example, a cosh2(x) distribution may result in smaller values of Kij because their spectra of plane waves are narrower than the ones computed here. However, the ratios |Kij/K00| are expected to increase with tilt parameter in a way similar to that of the ratios computed from Eqs. (7a)–(7c).

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Fig. 1 Fig. 2 Fig. 3

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