| 摘要 |
With a first set of filters serving as the start points of two tree-type transmission lines, a second set of filters is disposed at the transmission side of the first set of filters, respectively, and a third set of filters is disposed at the reflection side thereof, respectively. A first light-emitting device and a first light-receiving device are disposed at the transmission side of the first set of filters, respectively, and a second light-emitting device and a second light-receiving device are disposed at the reflection side thereof, respectively. A fourth light-emitting device and a fourth light-receiving device are disposed at the transmission side of the third set of filters, respectively, and a third light-emitting device and a third light-receiving device are disposed at the reflection side thereof, respectively. The first set of filters reflect optical signals having wavelengths in the vicinity of a second wavelength and transmit optical signals having the other wavelengths. The second set of filters reflect optical signals having wavelengths in the vicinities of third and fourth wavelengths and transmit optical signals having the other wavelengths. The third set of filters reflect optical signals having wavelengths in the vicinity of the third wavelength and transmit optical signals having the other wavelengths. <IMAGE> |
