Ring type optical transmission system and optical apparatus connected to same

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 comprises;
• a branching device which branches the input light into light of said allocated wavelength and light of wavelength except for said allocated wavelength, an optical switch configured to have a first input port which receives the light of said allocated wavelength branched by said branching device, a second input port which recieves and the light from said optical transmission section, and an output port which alternatively outputs, by switching, either the input light to the first input port or the input light to the second input port, and a multiplexer device which multiplexes the light of wavelength except for said allocated wavelength as branched by said branching device, and the output light from the output port of said optical switch.

A ring type optical transmission system comprising:

• a plurality of optical devices, each set with a different allocated wavelength, and comprising;
• an optical transmitting section which outputs light of 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;
• a central device which is capable of blocking light of a specific wavelength in the input light, while outputting light of said specific wavelength, where said specific wavelength corresponds to at least one of the allocated wavelengths in said plurality of optical devices;
• and
• a ring transmission path to which said plurality of optical devices and at least one of said central device are connected;
• wherein the insertion section comprises:
• an optical filter including at least four ports;
• and
• 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 which 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.

A ring type optical transmission system comprising:

• a plurality of first ring optical devices connected to a first ring transmission path, and each set with a different allocated wavelength, and comprising;
• an optical transmitting section which outputs light of 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;
• a plurality of second ring optical devices connected to a second ring transmission path, and each set with a different allocated wavelength, and comprising;
• an optical transmitting section which outputs light of 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;
• a switching device connected to said first and second ring transmission paths, and which is capable of switching between a first state in which said first and second ring transmission paths are connected to each other, and a second state in which said first and second ring transmission paths are closed and independent;
• wherein the insertion section comprises:
• an optical filter including at least four ports;
• and
• 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 which 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.