Silicon Photonics Mode-Selective Phase Shifter
Seyed Mohammad Reza Safaee, Kaveh (Hassan) Rahbardar Mojaver, Guowu, Zhang, and Odile Liboiron-Ladouceur

TL;DR
This paper introduces a mode-selective thermo-optic phase shifter using subwavelength grating structures on silicon photonics chips, enabling independent phase control of TE modes for advanced optical processing.
Contribution
It presents the first experimental demonstration of a mode-selective phase shifter with high selectivity and low loss, utilizing SWG structures for mode-specific phase manipulation.
Findings
Mode selectivity of 1.44 demonstrated experimentally.
TE0 thermo-optic coefficient is 44% larger than TE1.
Insertion loss is at most 2.5 dB with -13.1 dB crosstalk.
Abstract
A novel mode-selective thermo-optic phase shifter (MS-TOPS) enabled by subwavelength grating (SWG) structures is proposed and experimentally demonstrated on a 220 nm waveguide thick silicon photonics chip for the first two quasi-transverse electric modes (TE0, TE1). Mode-selective relative phase manipulation of modes unlocks several processing tasks in mode division multiplexing systems. This integrated solution provides a direct phase manipulation of modes without converting them to their fundamental modes. A Mach-Zehnder interferometer is deployed as a test structure incorporating the proposed MS-TOPS in one arm and a mode-insensitive thermo-optic phase shifter (MI-TOPS) in another. The effect of the SWG duty cycle ratio is investigated by both numerical simulations and experimental measurements. A mode-selectivity of 1.44 is experimentally demonstrated. In other words, the…
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Taxonomy
TopicsPhotonic and Optical Devices · Optical Network Technologies · Advanced Fiber Laser Technologies
