System and method of telecommunication with wavelength division multiplexing comprising a demultiplexer

A system of optical telecommunication, comprising:

• a transmitting station comprising signal sources for generating transmission signals at respective preset wavelengths, and a multiplexer for combining said transmission signals in a single fiber optic line;
• a receiving station for receiving said transmission signals, comprising a selective separator for separating said transmission signals;
• a fiber optic line linking said transmitting and receiving stations;
• and
• wherein said selective separator comprises a plurality of transmissive filters having respective transmission wavelength bands and a plurality of blocking filters having respective blocking wavelength bands, said plurality of transmissive filters and said plurality of blocking filters being connected in series and in an alternated sequence, said transmission wavelength bands being different from said blocking wavelength bands.

A system of optical telecommunication, comprising:

• a transmitting station comprising a plurality of signal sources for generating transmission signals at respective wavelengths, and a multiplexer for combining said transmission signals in a single fiber optic line;
• a station for receiving said transmission signals, comprising a selective separator for separating said transmission signals;
• a fiber optic line linking said transmission and receiving stations;
• wherein said selective separator comprises:
• a signal divider for subdividing said transmission signals over two optical paths;
• a first optical circulator and a second optical circulator, each having a first, a second, and a third port;
• the first port of each optical circulator being linked to a respective one of said optical paths for receiving said transmission signals;
• a first plurality of blocking filters optically coupled to the second port of the first optical circulator and adapted to receive said transmission signals and to reflect a first subset of transmission signals;
• a second plurality of blocking filters optically coupled to the second port of the second optical circulator and adapted to receive said transmission signals and to reflect a second subset of transmission signals;
• and
• a first plurality of transmissive filters optically coupled to the third port of the first optical circulator and adapted to receive the first subset of transmission signals and to transmit the first subset of transmission signals to a first plurality of receivers;
• a second plurality of transmissive filters optically coupled to the third port of the second optical circulator and adapted to receive the second subset of transmission signals and to transmit the second subset of transmission signals to a second plurality of receivers.

A wavelength-selective optical receiving unit, comprising a selective separator for separating wavelength division multiplexed transmission signals, wherein said selective separator comprises:

• a signal divider for subdividing said transmission signals over two optical paths;
• a first optical circulator and a second optical circulator, each having a first, a second, and a third port;
• the first port of each optical circulator being linked to a respective one of said optical paths for receiving said transmission signals;
• a first plurality of blocking filters optically coupled to the second port of the first optical circulator and adapted to receive said transmission signals and to reflect a first subset of transmission signals;
• a second plurality of blocking filters optically coupled to the second port of the second optical circulator and adapted to receive said transmission signals and to reflect a second subset of transmission signals;
• and
• a first plurality of transmissive filters optically coupled to the third port of the first optical circulator and adapted to receive the first subset of transmission signals and to transmit the first subset of transmission signals to a first plurality of receivers;
• a second plurality of transmissive filters optically coupled to the third port of the second optical circulator and adapted to receive the second subset of transmission signals and to transmit the second subset of transmission signals to a second plurality of receivers.