| 摘要 |
The device concerns measuring the propagation and bending losses that take place in the individual mode of the multi-mode waveguide. The method applied is a new one comprising butt-couple and prism-couple together with phase-modulation method. Electrodes are made on the waveguide, and applied with voltage. The electro-optical effect is used to modulate the effective length of the waveguide in forming a Fabry-Perot etalon. From here, the contrast of the butt-couple's output and the loss can be measured. At the same time, as the prism-couple is able to separate the multiple modes individually, and measure the contrast and loss of each mode through every output mode which are then compared with the butt-couple, each mode's propagation and bending losses values of the multi-mode waveguide can be derived.
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