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Tellurite And Fluorotellurite Glasses For Active And Passive

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2. Literature review; MDO 42<br />

Transmission / %<br />

100<br />

90<br />

80<br />

70<br />

60<br />

50<br />

40<br />

30<br />

20<br />

10<br />

0<br />

0 5 10 15 20 25<br />

Loss / dB<br />

Fig. (2.7): Relationship between optical fibre attenuation (in dB) and % transmission.<br />

2.4.3. Non-linear properties<br />

<strong>Glasses</strong> with high non-linearity have received much attention recently for uses as high<br />

speed switches, and Raman amplification. By utilising the third-order non-linearity of the<br />

glass, signal transmission can be improved using solitons, and bandwidth increased using<br />

all-optical processing [45]. Second-order non-linearity, not normally seen in isotropic<br />

materials such as glasses, has been shown by photo-induction, and electric field poling<br />

[45].

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