Patent ID: 6504637
Filing Date: 2003-01-07
Classification: H04B

Abstract:
An optical regeneration circuit comprising:optical wavelength selecting means for passing therethrough, from an incident signal light which includes a noise light, only a component at a wavelength of the signal light; a light source for outputting a continuous light at a certain constant wavelength; a saturable absorption type optical element having a saturable absorption region, for adding a light intensity of the continuous light received from said light source at one terminal and a light intensity of the signal light received at another terminal, for absorbing almost all the continuous light and the signal light when the added value is lower than a threshold value of the saturable absorption region, and for passing therethrough transmit the continuous light to output the passed light as a regenerated signal light at the other terminal when the added value is equal to or greater than said threshold value; and optical dividing means including a first terminal connected to said optical wavelength selecting means, a second terminal connected to said saturable absorption type optical element and an output terminal through which the regenerated signal light is outputted to the outside, for outputting the signal light received from said optical wavelength selecting means at the first terminal to said saturable absorption type optical element at the second terminal, and for outputting to the output terminal the regenerated signal light received from said saturable absorption type optical element at the second terminal.