Lasing wavelength can be larger or less than Bragg reflection wavelength.
激射波长可大于或小于布拉格反射波长。
The fiber Bragg grating used for simultaneous measurement of strain and temperature was written on the joint of two different fibers, and has two reflection peaks at different wavelength.
用于同时传感温度与应变的光纤光栅写于两种不同光纤的连接处，本身具有两个反射峰。
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