For fabricating semiconductor optical amplifier of polarization insensitive, a structure of the active layer was designed that is strain compensation with alternate 4 compressive and 3 tensile strain quantum wells and lattice-matched barrier layer.

Large band width and polarization insensitivity characteristics for such active structure are analyzed from the point of its gain spectra and energy band diagram.

The 3dB optical bandwidth of more than 70nm is obtained ranging the driving current from 100 to 250mA,moreover,the SOA has less than 1dB polarization sensitivity over the 0～250mA injection current and 3dB optical bandwidth.

For TM mode the gain is enhanced by tensile strained quantum wells, the SOA performs with low polarization sensitivity.

The simulation study shows that linear polarization sensitivity of silvered orthogonal twin mirrors is better than that of aluminum or aurum mirrors at the range of 0.

The polarization sensitivity testing equipment, included in this thesis,can test the linear polarization sensitivity of the spaceflight equipments,and offers experimental data for remote sensing information correcting.

The paper presented the theory and method for the ultrasonic lapping of spiral-bevel and hypoid gears and analyzed its insensitive vibration cutting mechanism.