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We proposed a microwave photonic topological insulator in non-bianisostropic photonic metacrystal waveguide with ε/μ-matching meta-atoms. Gapless pseudospin-momentum locked edge states and robust transport were experimentally observed. Dispersion-immune photonic topological insulators were realized by staggered photonic metacrystals.
Advanced modulation formats can enable >40 Gb/s data rates in waveguide-based optical interconnects without the need for high-specification optoelectronic components. Record 56Gb/s PAM-4 data transmission is demonstrated over a 1 m-long multimode polymer waveguide.
We report record error-free data transmission of 40Gb/s over a 1m-long multimode polymer spiral waveguide. The waveguide imposes no significant transmission impairments in the link despite its highly-multimoded nature and long length, demonstrating its potential in high-speed board-level optical interconnections.
We propose low loss silica high-mesa waveguide, of which a certain portion of propagation light profiles out of the waveguide, for infrared absorption. The implemented device showed extremely low loss of 0.02dB/cm
We report studies on bidirectional emission of ring cavity surface emitting quantum cascade lasers. Special attention is put on substrate emission and methods for favoring one single emission direction.
Ultra-high-Q nanocavity resonance tuning by laser-assisted thermal oxidation of silicon is demonstrated by using a 532 nm continuous wave laser. The resonance is blue-shifted by >2nm. The quality factor remains >200,000.
Ridge waveguide type-I quantum-well GaSb-based diode lasers, with active regions utilizing InGaAsSb/AlInGaAsSb quantum wells, have been demonstrated to operate at temperatures as high as 40°C with 1 mW of power at wavelengths above 3.2 μm.
We show that with simple spectral filtering, the Schmidt number for the transmitted photon-pairs (with 90% transmittance) which are produced via type-II parametric down-conversion in a KTP waveguide equals to unity to within 0.2%.
This investigation experimentally demonstrates tunable ultrafast and ultraslow light in an erbium doped waveguide for the first time. Group velocity of about -67.5 m/s (fast light) and 12.4 m/s (slow light) are reported.
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