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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 25 — Sep. 1, 2011
  • pp: E193–E199

Tooth-shaped grating-assisted structure for compact multimode interference coupler

Bidyut Deka and Partha Pratim Sahu  »View Author Affiliations

Applied Optics, Vol. 50, Issue 25, pp. E193-E199 (2011)

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A compact tooth-shaped grating-assisted structure has been proposed for a multimode interference (MMI) coupler and studied theoretically with silica waveguides with silicon oxynitride cores by using a mathematical model based on the sinusoidal mode simple effective index method. The dependence of the access waveguide length and beat length of the grating-assisted MMI (GA-MMI) structure on access waveguide separation (h) is shown. The total length of the GA-MMI coupler is less than that of a grating-assisted two-mode interference (GA-TMI) coupler ( h = 0 ) for an access waveguide S bending loss of 0.2 dB . It is also seen that the effect of fabrication tolerance on power imbalance of a GA-MMI coupler is almost close to that of a GA-TMI coupler.

© 2011 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(230.3120) Optical devices : Integrated optics devices
(230.7390) Optical devices : Waveguides, planar
(250.5300) Optoelectronics : Photonic integrated circuits
(350.2770) Other areas of optics : Gratings

Original Manuscript: April 8, 2011
Revised Manuscript: August 4, 2011
Manuscript Accepted: August 9, 2011
Published: August 23, 2011

Bidyut Deka and Partha Pratim Sahu, "Tooth-shaped grating-assisted structure for compact multimode interference coupler," Appl. Opt. 50, E193-E199 (2011)

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