Broadband three-mode converter and multiplexer based on cascaded symmetric Y-junctions and subwavelength engineered MMI and phase shifters

González-Andrade, David; Olivares, Irene; Cabo, Raque Fernández de; Vilas, Jaime; Dias, António; Velasco, Aitor V.

doi:10.1016/j.optlastec.2023.109513

Cited by 5 publications

(1 citation statement)

References 46 publications

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“…Active PSs mainly use the thermo-optical effect of silicon photonic waveguides to modify the effective refractive index of the waveguide by means of on-chip metal microheaters to achieve a corresponding phase shift [9,10]. In contrast, passive PSs have no requirement for control elements or driving power, eliminating the constraint of power consumption and enabling applications in novel optical 90 • hybrids [11], arbitrary ratio power splitters [12,13], and mode-division multiplexing (MDM) systems [14,15].…”

Section: Introductionmentioning

confidence: 99%

Inverse Design of Ultra-Compact and Low-Loss Optical Phase Shifters

Liao,

Tian,

Kang

et al. 2023

Photonics

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In previous works, inverse design methods have primarily focused on manipulating the optical power to achieve specific design targets. In this paper, we use the inverse design method to enable the precise engineering of the optical phase. As a proof of concept, we present a series of phase shifters (PSs) with varying phase shifts, which are inversely designed and theoretically validated on the silicon-on-insulator (SOI) platform. The designed PSs exhibit remarkable accuracy, with deviations of below 1°. These proposed PSs feature an ultra-compact footprint of 3 µm in length and offer superior fabrication tolerances compared to conventional structures. Over the 1535–1565 nm bandwidth, the discrepancy between the actual and target phase shifts remains below ±1° for all phase shifters, while the insertion loss is consistently below 0.035 dB. Moreover, the feasibility of the designed five PSs is verified using 2 × 2 multimode interference couplers (MMI).

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