WDM optical transmission system

A point-to-point type wavelength division multiplexing optical transmission system, comprising:

• a wavelength-demultiplexing means for receiving a wavelength-multiplexed signal that a monitor-signal wavelength component is multiplexed to a plurality of main-signal wavelength components and demultiplexing said wavelength-multiplexed signal into wavelength components;
• an optical switch for switching a wavelength component to need the regenerative repeating of said main-signal wavelength components demultiplexed by said wavelength-demultiplexing means into the side of a bit-rate-selective type regenerator as well as conducting the insertion of a signal from said bit-rate-selective type regenerator;
• said bit-rate-selective type regenerator for conducting the regenerative repeating to a signal from said optical switch according to the bit rate;
• a monitor signal receiver for receiving and terminating said monitor-signal wavelength component demultiplexed by said wavelength-demultiplexing means;
• a controller for detecting the bit rate and pass-through node number of each of said main-signal wavelength components by receiving a signal from said monitor signal receiver, generating a control signal to control the switching of said optical switch into the side of said bit-rate-selective type regenerator for said wavelength component signal from said wavelength-demultiplexing means to need the regenerative repeating, and rewriting information to show the bit rate, pass-through node number and execution/non-execution of regenerative repeating of each of said main-signal wavelength components to be output to the next-stage node;
• a monitor signal transmitter for generating a monitor-signal wavelength component according to a signal from said controller;
• and
• a wavelength-multiplexing means for multiplexing said main-signal wavelength components output from said optical switch and said monitor-signal wavelength component output from said monitor signal transmitter.

An optical insertion/separation ADM ring type wavelength division multiplexing optical transmission system, comprising:

• a wavelength-demultiplexing means for receiving a wavelength-multiplexed signal that a monitor-signal wavelength component is multiplexed to a plurality of main-signal wavelength components and demultiplexing said wavelength-multiplexed signal into wavelength components;
• an optical switch for switching a wavelength component to need the regenerative repeating of said main-signal wavelength components demultiplexed by said wavelength-demultiplexing means into the side of a bit-rate-selective type regenerator as well as conducting the insertion of a signal from said bit-rate-selective type regenerator;
• said bit-rate-selective type regenerator for conducting the regenerative repeating to a signal from said optical switch according to the bit rate;
• a monitor signal receiver for receiving and terminating said monitor-signal wavelength component demultiplexed by said wavelength-demultiplexing means;
• a controller for detecting the bit rate and pass-through node number of each of said main-signal wavelength components by receiving a signal from said monitor signal receiver, generating a control signal to control the switching of said optical switch into the side of said bit-rate-selective type regenerator for said wavelength component signal from said wavelength-demultiplexing means to need the regenerative repeating, and rewriting information to show the bit rate, pass-through node number and execution/non-execution of regenerative repeating of each of said main-signal wavelength components to be output to the next-stage node;
• a monitor signal transmitter for generating a monitor-signal wavelength component according to a signal from said controller;
• a second optical switch for conducting the separation/insertion of an arbitrary wavelength component from said main-signal wavelength components output from said optical signal;
• and
• a wavelength-multiplexing means for multiplexing said main-signal wavelength components output from said optical switch and said monitor-signal wavelength component output from said monitor signal transmitter.

A wavelength division multiplexing optical transmission system, comprising:

• a wavelength-demultiplexing means for receiving a wavelength-multiplexed signal and demultiplexing said wavelength-multiplexed signal into wavelength components;
• an optical switch for switching a wavelength component to need the regenerative repeating of said main-signal wavelength components demultiplexed by said wavelength-demultiplexing means into the side of a bit-rate-selective type regenerator as well as conducting the insertion of a signal from said bit-rate-selective type regenerator;
• said bit-rate-selective type regenerator for conducting the regenerative repeating to a signal from said optical switch according to the bit rate;
• a S/N monitor circuit for receiving said wavelength-multiplexed signal divided by an optical divider, conducting in the lump the S/N measurement of said wavelength components, and detecting a wavelength component with a S/N ratio less than a threshold value;
• a controller for generating a control signal to control the switching of said optical switch into the side of said bit-rate-selective type regenerator for said wavelength component signal from said wavelength-demultiplexing means to need the regenerative repeating according to information from said S/N monitor circuit;
• and
• a wavelength-multiplexing means for multiplexing said main-signal wavelength components output from said optical switch.

A wavelength division multiplexing optical transmission system, comprising:

• a wavelength-demultiplexing means for receiving a wavelength-multiplexed signal and demultiplexing said wavelength-multiplexed signal into wavelength components;
• an optical switch for switching a wavelength component to need the regenerative repeating of said main-signal wavelength components demultiplexed by said wavelength-demultiplexing means into the side of a bit-rate-selective type regenerator as well as conducting the insertion of a signal from said bit-rate-selective type regenerator;
• said bit-rate-selective type regenerator for conducting the regenerative repeating to a signal from said optical switch according to the bit rate;
• a S/N monitor circuit for receiving said wavelength-multiplexed signal divided by an optical divider, conducting separately the S/N measurement of said wavelength components, and detecting a wavelength component with a S/N ratio less than a threshold value;
• a controller for generating a control signal to control the switching of said optical switch into the side of said bit-rate-selective type regenerator for said wavelength component signal from said wavelength-demultiplexing means to need the regenerative repeating according to information from said S/N monitor circuit;
• and
• a wavelength-multiplexing means for multiplexing said main-signal wavelength components output from said optical switch.