PURPOSE: To convert wave length over a broad band of an ultra high speed light pulse signal by generating a white pulse signal according to the signal inputted into a non-linear light wave guiding pathway medium and separating a specified wave length component.
CONSTITUTION: A white pulse signal whose spectrum is continuously broad on both sides of wave length λin is generated when a light pulse signal of wave length λin is inputted into a single mode optical fiber 21 which is one of a non-linear light wave guiding pathway medium. The light pulse signal whose wave length is converted from tin to λout is outputted, by separating a transmitting wave length λout from this white pulse signal by means of a wave length filter 22. And a converted light having an arbitrary central wave length λout in the band range can be obtained when the transmitting wave length λout is made changed in the band of the white pulse signal by using a wave length filter in which the transmitting wave length λout can be varied. Thus, conversion into one or different plural wave lengths can be performed near the wave length of the light pulse signal without using the other light source, by means of this constitution.
MORIOKA TOSHIO
SARUWATARI MASATOSHI
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