Unconstrained splitting ratios in compact double-MMI couplers | Zendy

Matteo Cherchi | Zendy; Sami Ylinen | Zendy; Mikko Harjanne | Zendy; Markku Kapulainen | Zendy; Tapani Vehmas | Zendy; Timo Aalto | Zendy

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Unconstrained splitting ratios in compact double-MMI couplers

Author(s) -

Matteo Cherchi,

Sami Ylinen,

Mikko Harjanne,

Markku Kapulainen,

Tapani Vehmas,

Timo Aalto

Publication year - 2014

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.009245

Subject(s) - optics , phase shift module , ranging , materials science , silicon on insulator , wafer , beam splitter , power dividers and directional couplers , phase (matter) , interference (communication) , splitter , optoelectronics , physics , insertion loss , laser , telecommunications , computer science , silicon , channel (broadcasting) , quantum mechanics

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.

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