Patent ID: 8929732
Filing Date: 2015-01-06
Classification: H04B,H04L

Abstract:
1. A communication system, comprising: an optical distribution device that outputs an input optical signal; and plural optical communication apparatuses, each of which is connected to the optical distribution device, wherein the optical distribution device comprises: plural optically inputting units, into each of which an optical signal is inputted, and each of the plural optically inputting units is connected to each of the plural optical communication apparatuses; and plural optically outputting units, each of which outputs an optical signal and is connected to each of the plural optical communication apparatuses, an optical signal input into an optically inputting unit among the plural inputting units is output from all of the plural outputting units, and each optical communication apparatus comprises: an optically transmitting unit that transmits an optical signal to an optically inputting unit among the plural optically inputting units; an optically receiving unit that receives an optical signal output from an optically outputting unit among the plural optically outputting units; and a collision detecting unit that detects whether a transmission of an optical signal performed by the optically transmitting unit of said each optical communication apparatus collides with a transmission of an optical signal performed by another optically transmitting unit comprised by another optical communication apparatus; wherein the communication system further comprises: another optical distribution device that is configured similarly to the optical distribution device; and another plural optical communication apparatuses that are connected to said another optical distribution device and are configured similarly to the plural optical communication apparatuses; wherein a predetermined optically outputting unit in the optical distribution device is connected through a first filter to said another optical distribution device, a predetermined optically outputting unit in said another optical distribution device is connected through a second filter to the optical distribution device, the first filter attenuates an optical signal whose wavelength is different from a wavelength of an optical signal to be transmitted from the plural optical communication apparatuses, but not an optical signal whose wavelength is not different from the wavelength of the optical signal to be transmitted from the plural optical communication apparatuses, the second filter attenuates an optical signal whose wavelength is different from a wavelength of an optical signal to be transmitted from said another plural optical communication apparatuses, but not an optical signal whose wavelength is not different from the wavelength of the optical signal to be transmitted from said another plural optical communication apparatuses; and the wavelength of the optical signal to be transmitted from the plural optical communication apparatuses is different from the wavelength of the optical signal to be transmitted from said another plural optical communication apparatuses.