Fast Mode-Switching (60ns) by Using A 2 × 2 Silicon Optical Mode Switch

Haisong JIANG  Ryan IMANSYAH  Luke HIMBELE  Shota OE  Kiichi HAMAMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.10   pp.782-788
Publication Date: 2017/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.782
Type of Manuscript: Special Section PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
optical mode switch,  phase shifter,  mode crosstalk,  mode filter,  multimode,  silicon photonics,  

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We present dynamic mode switching characteristic by using a 2 × 2 optical mode switch based on silicon waveguide. The configuration of optical mode switch is similar to MZI where the width of input and output ports are designed to permit the combining of the fundamental mode and the first order mode. We designed the symmetrical arms with phase shifter based on p-i-n structure in one arm to generate a π-phase difference between each arm. As a result, mode switching with the injection current of 60mA (5.7V) was successfully achieved with the mode crosstalk of -10dB at λ=1550nm. A minimum of less than 60ns and 40ns mode switching time for the fundamental mode to first order mode and first order mode to fundamental mode, was achieved respectively in this time.