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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 19 — Sep. 18, 2006
  • pp: 8753–8764

Principles and application of reduced beat length in MMI couplers

Lung-Wei Chung, San-Liang Lee, and Yen-Juei Lin  »View Author Affiliations

Optics Express, Vol. 14, Issue 19, pp. 8753-8764 (2006)

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A unified method was proposed to reduce the beat length of a multimode interference (MMI) coupler. By properly adjusting the phase difference of the N-fold images, the mode evolution is changed to generate self-images at a much shorter distance. The effect of adjusting the phase difference can be regarded as dividing the original MMI coupler into multiple sub-MMI couplers. Such an effect can be applied for both symmetric- and paired-interference cases. We applied the principle to design compact optical splitters operating at dual wavelength bands. The simulation shows that excellent performance with reduced coupler length can be obtained for splitters operating at both 1.3 and 1.55 µm bands.

© 2006 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.1360) Optical devices : Beam splitters
(230.7370) Optical devices : Waveguides

ToC Category:
Optical Devices

Original Manuscript: June 22, 2006
Revised Manuscript: September 7, 2006
Manuscript Accepted: September 10, 2006
Published: September 18, 2006

Lung-Wei Chung, San-Liang Lee, and Yen-Juei Lin, "Principles and application of reduced beat length in MMI couplers," Opt. Express 14, 8753-8764 (2006)

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