Cross connecting device and optical communication system

A cross connecting device in an optical communication system employing a wavelength multiplex transmission method of transmitting an optical signal with wavelengths multiplexed, comprising:

• a first optical demultiplexer for demultiplexing said wavelength multiplexed signal to a wavelength band composed of a plurality of wavelengths,
• a first matrix switch for receiving input of said wavelength band demultiplexed by said first optical demultiplexer to conduct path switching,
• a first optical multiplexer for multiplexing outputs of said first matrix switch and outputting the multiplexed signal,
• a second optical demultiplexer for receiving said wavelength band of an arbitrary band zone branched from at least one of branch ports of said first matrix switch and demultiplexing the band to a signal of each wavelength,
• a second matrix switch for receiving input of said signal of each wavelength demultiplexed by said second optical demultiplexer to conduct path switching, and
• a second optical multiplexer for multiplexing outputs of said second matrix switch and sending out the multiplexed signal to at least one of insertion ports of said first matrix switch.

An optical communication system, wherein

• a cross connecting device is applied to a node device,
• said cross connecting device comprising:
• a first matrix switch for conducting path change of an applied wavelength multiplexed signal on the basis of a plurality of wavelength bands,
• a second matrix switch for switching a path of a part of switch outputs from the first matrix switch on a wavelength basis, and
• an optical demultiplexer provided on a link connecting said first and second matrix switches and capable of demultiplexing an arbitrary wavelength band.

An optical communication system, wherein

• a cross connecting device in the optical communication system employing a wavelength multiplex transmission method of transmitting an optical signal with wavelengths multiplexed is applied to a node device,
• said cross connecting device comprising:
• a first optical demultiplexer for demultiplexing said wavelength multiplexed signal to a wavelength band composed of a plurality of wavelengths,
• a first matrix switch for receiving input of said wavelength band demultiplexed by said first optical demultiplexer to conduct path switching,
• a first optical multiplexer for multiplexing outputs of said first matrix switch and outputting the multiplexed signal,
• a second optical demultiplexer for receiving said wavelength band of an arbitrary band zone branched from at least one of branch ports of said first matrix switch and demultiplexing the band to a signal of each wavelength,
• a second matrix switch for receiving input of said signal of each wavelength demultiplexed by said second optical demultiplexer to conduct path switching, and
• a second optical multiplexer for multiplexing outputs of said second matrix switch and sending out the multiplexed signal to at least one of insertion ports of said first matrix switch.