Light source used in wavelength multiplexing

A light source for outputting a light for wavelength division multiplexing transmission wherein a plurality of lights varied in wavelength are multiplexed, said light source comprising:

• emitter means for emitting a plurality of fundamental-wave lights controlled to be k times longer in wavelength than lights to be multiplexed and to have a wavelength interval between each adjacent fundamental-wave light, wherein k is greater than 1;
• and
• wavelength converter means for receiving said fundamental-wave lights and outputting lights including lights of one-kth a wavelength of each of said fundamental-wave lights;
• wherein
• the lights outputted from the wavelength converter means further include fundamental-wave lights, and
• a wavelength band of each of said fundamental-wave lights is eliminated through a loss at transmission.

A light source for outputting a light for wavelength division multiplexing transmission wherein a plurality of lights varied in wavelength are multiplexed, said light source comprising:

• emitter means for emitting a plurality of fundamental-wave lights controlled to be k times longer in wavelength than lights to be multiplexed and to have a wavelength interval between each adjacent fundamental-wave light, wherein k is greater than 1;
• and
• wavelength converter means for receiving said fundamental-wave lights and outputting lights including lights of one-kth a wavelength of each of said fundamental-wave lights,
• wherein
• said k is 2,
• said wavelength converter means is an optical material crystal having a second-order non-linear optical effect,
• the lights outputted from the wavelength converter means further include fundamental-wave lights, and
• a wavelength band of each of said fundamental-wave lights is eliminated through a loss at transmission.

A light source for outputting a light for wavelength division multiplexing transmission wherein a plurality of lights varied in wavelength are multiplexed, said light source comprising:

• emitter means for emitting a plurality of fundamental-wave lights controlled to be k times longer in wavelength than lights to be multiplexed and to have a wavelength interval between each adjacent fundamental-wave light, wherein k is greater than 1;
• wavelength converter means for receiving said fundamental-wave lights and outputting lights including lights of one-kth a wavelength of each of said fundamental-wave lights;
• and
• a transmission medium for directly receiving the lights outputted from said wavelength converter means and transmitting the lights, wherein said transmission medium is a polymethyl methacrylate plastic optical fiber;
• wherein
• said k is 2,
• said wavelength converter means is an optical material crystal having a second-order non-linear effect, and
• a wavelength band of said fundamental light is 1.3 μm.

A light source for outputting a light for wavelength division multiplexing transmission wherein a plurality of lights varied in wavelength are multiplexed, said light source comprising:

• a plurality of emitters operable to emit a plurality of fundamental-wave lights controlled to be k times longer in wavelength than lights to be multiplexed and to have a wavelength interval between each adjacent fundamental-wave light, wherein k is greater than 1;
• a wavelength converter operable to receive the fundamental-wave lights and output lights including lights of one-kth a wavelength of each of the fundamental-wave lights;
• and
• a multiplexer operable to multiplex the lights outputted from said wavelength converter.

A light source for outputting a light for wavelength division multiplexing transmission wherein a plurality of lights varied in wavelength are multiplexed, said light source comprising:

• a plurality of emitters operable to emit a plurality of fundamental-wave lights controlled to be k times longer in wavelength than lights to be multiplexed and to have a wavelength interval between each adjacent fundamental-wave light, wherein k is greater than 1;
• and
• a wavelength converter operable to receive the fundamental-wave lights and output lights including lights of one-kth a wavelength of each of the fundamental-wave lights;
• wherein
• the lights outputted from the wavelength converter further include fundamental-wave lights, and
• a wavelength band of each of the fundamental-wave lights is eliminated through a loss at transmission.

A light source for outputting a light for wavelength division multiplexing transmission wherein a plurality of lights varied in wavelength are multiplexed, said light source comprising:

• a plurality of emitters operable to emit a plurality of fundamental-wave lights controlled to be k times longer in wavelength than lights to be multiplexed and to have a wavelength interval between each adjacent fundamental-wave light, wherein k is greater than 1;
• and
• a wavelength converter operable to receive the fundamental-wave lights and output lights including lights of one-kth a wavelength of each of the fundamental-wave lights;
• wherein
• k is 2,
• said wavelength converter is an optical material crystal having a second-order non-linear optical effect,
• the lights outputted from the wavelength converter further include fundamental-wave lights, and
• a wavelength band of each of the fundamental-wave lights is eliminated through a loss at transmission.

A light source for outputting a light for wavelength division multiplexing transmission wherein a plurality of lights varied in wavelength are multiplexed, said light source comprising:

• a plurality of emitters operable to emit a plurality of fundamental-wave lights controlled to be k times longer in wavelength than lights to be multiplexed and to have a wavelength interval between each adjacent fundamental-wave light, wherein k is greater than 1;
• and
• a wavelength converter operable to receive the fundamental-wave lights and output lights including lights of one-kth a wavelength of each of the fundamental-wave lights
• a transmission medium positioned to directly receive the lights outputted from said wavelength converter and capable of transmitting the lights;
• wherein
• said transmission medium is a polymethyl methacrylate plastic optical fiber,
• k is 2,
• said wavelength converter is an optical material crystal having a second-order non-linear optical effect, and
• a wavelength band of the fundamental-wave light is 1.3 μm.