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Highly oriented and perovskite structure KTN (potassium tantalate-niobate) thin films were fabricated by pulsed laser deposition technique on Si(100) substrates. The surface of the thin films is homogeneous, crack-free and dense. The ferroelectric measurement was carried out on metal-ferroelectric-metal capacitors and the remanent polarization and the coercive field were 8.66 μC/cm 2 and 7.44 kV/cm, respectively. The effects of the substrate temperature, laser energy density on the target and oxygen pressure during the deposition process on the structure of thin films were discussed.

This paper is an introduction of high speed optical communication systems used in China, especially those deployed by the Ministry of Post and Telecommunication. Practical high speed systems, such as 565 Mb/s system and the optical devices used in these systems manufactured in China are described. Further development of high speed systems and devices such as SDH systems at 622 Mb/s and 2.5 Gb/s, EDFA, MQW laser diodes and a comprehensive test bed are discussed.