| 摘要 |
PURPOSE:To attain a direct connection between terminals without using a wavelength conversion device by providing light sources having different wavelengths with each other on each of subscriber's terminals and allocating different transmission wavelengths with each other on each of the terminals in the setting of a channel. CONSTITUTION:Each of subscriber's terminals 101-104 has two light sources having the wavelengths of lambda1 and lambda2, enabling a transmission with switching an optical signal of either one wavelength. For example, when a communication is performed between the terminal 101 and 104, the terminal 101 transmits with a wavelength of lambda1 and the terminal 104 with that of lambda2 and also, by forming the channel in the route of a subscriber fiber 341 optical switches 351 and 354 a subscriber fiber 344 by a light exchanger 105, a connection between the terminals 101 and 104 can be obtained. At such a time, so that a wavelength exchanger is not required between the terminals 101 and 104, the communication can be performed with an optical signal of optical signal speed/modulation system. Besides, the communication in such a way that the terminal 101 transmits with the wavelength of lambda2 and the terminal 104 with that of lambda1 causes no trouble. |
