Patent ID: 7522798
Filing Date: 2009-04-21
Classification: G02F

Abstract:
1. A nonlinear optical signal-treating apparatus, comprising: (a) a pulse light source for outputting first pulse light into a free space; (b) a first optical fiber having a first end and a second end; (c) a second optical fiber that (d) a light-introducing optical system, comprising a collimating lens and a condensing lens, for inputting the first pulse light into the first end of the first optical fiber; the ratio of the peak power of the first pulse light outputted from the first optical fiber to that of the first pulse light inputted into the first optical fiber being at least 0.5 and at most 1.5 and the ratio of the pulse width of the first pulse light outputted from the first optical fiber to that of the first pulse light inputted into the first optical fiber being at least 0.5 and at most 1.5, wherein the first optical fiber has a mode-field diameter of at least 8 μm at a wavelength of 1.55 μm.