| 摘要 |
PURPOSE:To obtain quite a new-type optical repeating device, by performing the transmission and reception of the light through several units of semiconductor lasers arranged in the middle of the optical transmission medium and then providing the feedback preventing means between the semiconductor laser and the optical transmission medium. CONSTITUTION:The optical repeating device consists of the joint laser beam transmitter and receiver 1 and 2, the reflection polarizer 3 provided between the transmitter 1 and the receiver 2 and utilizing the Brewster's angle, and the 1/2-wavelength plate 4 each. The reflection polarizer 3 functions as an eliminating means for the feedback light of the optical repeating device. If a correspondence is secured between the reflection factors of the polarizer 3 and the beams b1 and c2 as R90 (01: incident angle; 02: angle of refraction) and R0 respectively, the signal beam b1 sent from the joint laser 1 reaches the joint laser 2 with no loss. However, the beam from the laser 2 receives the reflection loss due to the polarizer 3 and does not reach the laser 1. |
