期刊
OPTICS LETTERS
卷 42, 期 16, 页码 3093-3096出版社
Optica Publishing Group
DOI: 10.1364/OL.42.003093
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资金
- Hong Kong Research Grants Council Early Career Scheme [24208915]
- National Natural Science Foundation of China (NSFC)
- Research Grants Council (RGC) of Hong Kong Joint Research Scheme [N_CUHK415/15]
Polarization 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 mu m x 4.2 mu m. 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 similar to 2.5 dB in the measured wavelength range of 1440-1580 nm, where the smallest value reaches similar to 2 dB. The devices can serve as a generic approach and standard module for controlling light polarization in integrated photonic circuitry. (C) 2017 Optical Society of America
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