Patent ID: 7460744
Filing Date: 2008-12-02
Classification: H04J

Abstract:
1. An optical device which is capable of constructing a ring type optical transmission system by connecting to other optical devices which are each set with a different allocated wavelength, and which has a set allocated wavelength, said optical device comprising: an optical transmitting section configured to output light of which wavelength is identical to said allocated wavelength; and an insertion section which has; a first state in which light of said allocated wavelength in the input light is blocked, while light of said allocated wavelength input from said optical transmitting section, and light in the input light which is not of said allocated wavelength is output, and a second state in which the input light is output, while light of said allocated wavelength input from said optical transmitting section is blocked; wherein the insertion section comprises: an optical filter including at least four ports; an optical switch including two input ports and an output port; wherein: said optical filter includes a first port that receives the input light, a second port that outputs light component of said allocated wavelength out of the input light, a third port that receives an output light from the output port of said optical switch, and a fourth port that outputs a multiplexed light that is obtained by multiplexing light component of wavelength other than said allocated wavelength out of the input light with light inputted to the third port, and said optical switch includes a first input port that receives the output light from the second port of said optical filter, a second input port that receives the light outputted by said optical transmitting section, and the output port that is switchably connected to one of the first and second input ports.