Genetic-algorithm-optimized wideband on-chip polarization rotator with an ultrasmall footprint
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AbstractPolarization control of light waves is an important technique in optical communication and signal processing. On-chip polarization rotation from the fundamental transverse-electric (TE00) mode to the fundamental transverse-magnetic (TM00) mode is usually difficult because of their large effective refractive index difference. Here, we demonstrate an on-chip wideband polarization rotator designed with a genetic algorithm to convert the TE00 mode into the TM00 mode within a footprint of 0.96 μm ×4.2  μm. In simulation, the optimized structure achieves polarization rotation with a minimum conversion loss of 0.7 dB and the 1-dB bandwidth of 157 nm. Experimentally, our fabricated devices have demonstrated the expected polarization rotation with a conversion loss of ∼2.5  dB in the measured wavelength range of 1440–1580 nm, where the smallest value reaches ∼2  dB. The devices can serve as a generic approach and standard module for controlling light polarization in integrated photonic circuitry.
All Author(s) ListYu ZJ, Cui HR, Sun XK
Journal nameOptics Letters
Year2017
Month8
Volume Number42
Issue Number16
Pages3093 - 3096
ISSN0146-9592
eISSN1539-4794
LanguagesEnglish-United States

Last updated on 2021-28-02 at 02:09