For glass fibers, there are two "optical windows" where the fiber is most transparent and efficient. The centers of these windows are 1300 nm and 1550 nm, providing approximately 18,000 GHz and ...

Borosilicate 3.3 (PZ33) is the alternative for borofloat 33(BF33).The content of borosilicate : boron: 12.5 ～ 13.5%, silicon: 78 ～ 80%. Therefore, this kind of glass is called high borosilicate glass.