| abstract |
An optical clock signal regeneration device, which includes a mode-locking laser element, a signal light provision component and an optical clock signal formation component, is provided. The signal light provision component includes a birefringent medium, at which a polarization group delay time between orthogonal polarization signals, which is caused by a difference in refractive indices between orthogonal optical axes, is a natural number multiple of a signal time interval of an inputted signal light, and, on the basis of orthogonal polarization signal light obtained by passing input signal light which is inputted from outside through the birefringent medium, provides at least a signal light component with a light polarization direction that matches an oscillation polarization direction of the mode-locking semiconductor laser to the mode-locking laser element. |