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Optics Letters

Optics Letters


  • Vol. 30, Iss. 2 — Jan. 15, 2005
  • pp: 135–137

Principal modes in multimode waveguides

Shanhui Fan and Joseph M. Kahn  »View Author Affiliations

Optics Letters, Vol. 30, Issue 2, pp. 135-137 (2005)

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We generalize the concept of principal states of polarization and prove the existence of principal modes in multimode waveguides. Principal modes do not suffer from modal dispersion to first order of frequency variation and form orthogonal bases at both the input and the output ends of the waveguide. We show that principal modes are generally different from eigenmodes, even in uniform waveguides, unlike the special case of a single-mode fiber with uniform birefringence. The difference is most pronounced when different eigenmodes possess similar group velocities and when their field patterns vary as a function of frequency. This work may provide a new basis for analysis and control of dispersion in multimode fiber systems.

© 2005 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(230.7370) Optical devices : Waveguides

Shanhui Fan and Joseph M. Kahn, "Principal modes in multimode waveguides," Opt. Lett. 30, 135-137 (2005)

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