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High reliability, high transmission speed and low power consumption laser diodes are required for optical interconnect. We have developed 1060 nm Vertical Cavity Surface Emitting Lasers (VCSELs) with InGaAs/GaAs strained quantum wells, oxide-confined and double intracavity structures for the requirement. In this paper, an extremely long term aging test close to the actual operating temperature was...
We demonstrate all-optical 2R regeneration with a 90° optical hybrid and integrated MZI-SOA pairs for 10 Gb/s BPSK and 20 Gb/s QPSK with negative power penalty. Power penalty and OSNR improvements of 7 dB and 5 dB are shown with additive ASE noise.
We experimentally demonstrate cascadable regeneration of 10Gb/s DPSK signals by using a two-fold cascade of SOA-based wavelength converters. No additional power penalty and 3dB OSNR improvement are observed between 1 and 2 hops.
The lattice constant of a single-defect photonic crystal vertical-cavity surface-emitting laser (PhC-VCSEL) is numerically optimized to achieve the highest single-mode power in the fundamental mode. The simulated results are compared to measured device characteristics, and the different factors influencing the single-mode behavior are analyzed.
Thermal lens effect on single-transverse-mode stability of proton-implanted photonic-crystal vertical-cavity surface-emitting lasers is studied. Theoretical and experimental demonstration of the trade-off between the single-mode stability and low loss. Single-mode stability with a smaller lattice constant is also discussed.
Photo-induced effects in layered perovskite manganite La 0.5 Sr 1.5 MnO 4 are investigated with time- and polarization-resolved spectroscopy technique. The destruction of charge/orbital ordering, which is observed as the change of the reflectivity and the birefringence, occurs immediately (<1 ps) after the illumination of intense light pulse. The reflectivity change probing...
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