| 摘要 |
PURPOSE:To decrease the number of parts of a device and to achieve a low power consumption by using a semiconductor laser as a light source for transmitting information and a wavelength selecting type light amplifying element. CONSTITUTION:Switches 18-1 and 18-2 are connected to a1 and a2 sides, information signals 19-1 and 19-2 are sent through a modulating circuit to semiconductor lasers 12-1 and 22-2, converted to the light signal of wavelengths lambda1 and lambda2 and inputted to a 1X2 port type light star coupler 14-1. The output of the coupler 14-1 is transmitted through an optical fiber 15 to a B station side. At the B station, a light signal is supplied through a star coupler 14-2 equal to an A station to semiconductor lasers 12-3 and 12-4. At such a time, respective semiconductor lasers 12-3 and 12-4 are connected to current supplying parts 21-3 and 21-4 and operated as the wavelength selecting type amplifying element of the wavelength lambda1, and the wavelength lambda2. By the reverse connection of the switch of respective stations, the transmission from the B station to the A station is executed. |
