Lu Peng

Radiation effects on opto-electronic devices for fiber-optic gyroscopes

The radiation effects of opto-electronic devices used in fiber-optic gyroscope are introduced in this paper. The radiation characteristics of opto-electronic devices are studied by performing total dose radiation experiment, and the influences of anti-radiation capability of opto-electronic devices on the performance of fiber-optic gyroscope are analyzed. The research results show that SLD (superluminescent diode) source, PIN detector, Y wave-guide and fiber optic coupler are not sensitive to the radiation of γ rays, while the polarization maintaining optical fiber is comparatively sensitive to radiation. It is found that C polarization maintaining optical fiber has the strongest anti-radiation capability to satisfy the space application demand of fiber-optic gyroscope.

Strain-Engineered Low-Density InAs Bilayer Quantum Dots for Single Photon Emission

We investigate the growth of strain-engineered low-density InAs bilayer quantum dots (BQDs) on GaAs by molecular beam epitaxy. Owing to increasing dot size and In composition of the upper QDs, low-density BQDs in a GaAs matrix with an emission wavelength up to 1.4 μm at room temperature are achieved. Such a wavelength is larger than that of conventional QDs in a GaAs matrix (generally of about 1.3 μm). The optical properties of the BQDs are sensitive to annealing temperature used after spacer layer growth. Significant decrease of integrated PL intensity is observed as the annealing temperature increases. At 10K, single photon emission from the BQDs with wavelength around 1.3 μm is observed.