High speed optical modulator based on silicon slotted-rib waveguide

A high-speed electro-optic modulator based on CMOS compatible silicon waveguide is proposed. The optical waveguide in silicon is formed by creating a slot in a rib structure that results in a strong optical confinement with an acceptably low propagation loss. The proposed design of slotted-rib waveg...

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Bibliographic Details
Published in:Optics communications 2019-03, Vol.434, p.49-53
Main Authors: Jain, Sourabh, Rajput, Swati, Kaushik, Vishal, Kumar, Mukesh
Format: Article
Language:English
Subjects:
Optical modulator
Silicon photonics
Slot waveguide
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Summary:A high-speed electro-optic modulator based on CMOS compatible silicon waveguide is proposed. The optical waveguide in silicon is formed by creating a slot in a rib structure that results in a strong optical confinement with an acceptably low propagation loss. The proposed design of slotted-rib waveguide with a traveling-wave electrode facilitates an efficient optical modulation in silicon. Taking the advantage of velocity matched between optical and microwave modes, a high-speed operation up to 70 Gbps with an extinction ratio of ≈ 4.9 dB is reported at a peak to peak voltage of 3 Vpp under a reverse bias of 4 V. An insertion loss of 3.1 dB is obtained for a 4 mm long device.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2018.10.028