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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 8 — Apr. 21, 2014
  • pp: 9245–9253

Unconstrained splitting ratios in compact double-MMI couplers

Matteo Cherchi, Sami Ylinen, Mikko Harjanne, Markku Kapulainen, Tapani Vehmas, and Timo Aalto  »View Author Affiliations


Optics Express, Vol. 22, Issue 8, pp. 9245-9253 (2014)
http://dx.doi.org/10.1364/OE.22.009245


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Abstract

A novel guided-wave optical power coupler is presented, based on two 2x2 50/50 multimode interference splitters connected with tapered waveguides that play the role of a phase shifter. By simply changing the length of this phase shifter, these double-MMI couplers can be easily designed to get any desired splitting ratio. Results of simulations are discussed and compared with the characterizations of devices fabricated on micron-scale SOI wafers, to highlight pros and cons of the proposed solution. The fabricated splitters have been found to have average losses about 0.4 ± 0.5 dB and splitting ratios ranging from 56/44 to 96/4.

© 2014 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides
(250.5300) Optoelectronics : Photonic integrated circuits

ToC Category:
Integrated Optics

History
Original Manuscript: December 10, 2013
Revised Manuscript: March 21, 2014
Manuscript Accepted: March 28, 2014
Published: April 9, 2014

Citation
Matteo Cherchi, Sami Ylinen, Mikko Harjanne, Markku Kapulainen, Tapani Vehmas, and Timo Aalto, "Unconstrained splitting ratios in compact double-MMI couplers," Opt. Express 22, 9245-9253 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-8-9245


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References

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