| 摘要 |
PURPOSE: An amplitude mask and a demultiplexer including a long period fiber grating thereby are provided to stabilize an electrical characteristic of the demultiplexer by forming simultaneously long period gratings of fibers under the same condition. CONSTITUTION: An amplitude mask includes a plurality of slits and a frame. The slits have different widths, respectively. The frame is used for defining shapes of the slits. The frame includes a dividing frame to divide the slits into two parts, respectively. The dividing frame is arrayed on the amplitude mask. A demultiplexer(30) includes a coupler(31) and a fiber(33,35). The coupler is used for receiving the multiplexed optical signals and dividing the intensity of the multiplexed optical signals. The fiber is used for outputting the divided optical signals. The fiber include the slits having different widths and the frame for defining the shapes of the slits.
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