| 摘要 |
PROBLEM TO BE SOLVED: To increase light absorption efficiency of an L band while suppressing reduction of an operation speed and deterioration of a signal-to-noise ratio.SOLUTION: A photodetector comprises a first silicon layer 101, an absorption layer 102, a second silicon layer 103, a first electrode 104, a second electrode 105 and a core 106. The first silicon layer 101 extends from a light input terminal 111 in a light guide direction, and light inputted from the light input terminal 111 is guided. The absorption layer 102 is comprised of germanium and formed on the first silicon layer 101 while extending in the light guide direction together with the first silicon layer 101. The absorption layer 102 is formed thinner as it is away from the light input terminal 111.SELECTED DRAWING: Figure 1 |
