The calculation based on the new model to simulate the cooling of films which deposit at high temperature reveal the relations between the averaged refractive index of the films after cooling with some technical and material parameters.

The index modulation function of edge fiber Bragg grating (EFBG) is acquired using genetic algorithms synthesizing, and a method for fabricating tunable EFBG by changing the diameter of the fiber along its axis and applying tension to the fiber grating is proposed and testified.

We research the various index modulation methods and design the scanning device to realize the apodized exposure.

Influence of refractive index modulation on fiber Bragg grating characteristics

With the eigen matrix method,it simulates properties of defect modes in 1D-PC containing zero average refractivity materials and discoveres dual defect modes in the first band gap.

when the defect layer materials satisfied the condition:n_+d_+ +n_d_=0,we named it zero average refractivity materials,and viewed the defect layer as a whole;When the condition was not satisfied,the defect layer was considered from two materials.

The method for observing the refractive index moudulation of light-induced planar photonic lattices by emplo- ying build both Mach-Zehnder interferomenter and LBA-PC make up of the observation system is investigated.