Microwave signal transmission over a directly-modulated radio-over-fiber link using cascaded semiconductor optical amplifiers

We demonstrate a record 150km transmission of microwave signals by a directly-modulated radio-over-fiber link with a bit-error-rate of less than 10-12. Cascaded semiconductor optical amplifiers are employed in this link to extend the transmission link length. © 2005 Optical Society of America.

Development of non-weak link bulk YBCO grain boundaries for high magnetic field eegimeering applications

A non-weak link joining technique has been developed for YBCO pseudo-crystals fabricated by seeded peritectic solidification based on the formation of a liquid phase which segregates from the platelet boundaries at temperatures above = 920 °C. Electrical and magnetic measurements on these boundaries suggest that their irreversibility field can be as high as 7 T at 77 K in fully oxygenated pseudo-crystals joined along their crystallographic ab-planes which is comparable to the irreversibility behaviour of the adjacent YBCO grains. © 1999 IEEE.