| 摘要 |
PROBLEM TO BE SOLVED: To improve an optical pulse compressor. SOLUTION: This optical pulse compressor comprises a pulse source 10, a nonlinear optical waveguide part 11 provided with a cyclic structure like Bragg gating and a linear optical waveguide part 13 provided with a negative dispersion part and the nonlinear optical waveguide part 11 supplies positive dispersion. The nonlinear waveguide 11 is to be provided with a secondary refractive index (N2 ) which is at least ten folds of the secondary refractive index (N2 ') of the linear waveguide 13. It is preferable that the nonlinear waveguide 11 is a chalcogenide fiber provided with a Bragg grating inside a core 15. Since the size of dispersion is larger by several orders in the grating compared to a standard optical fiber, the length of the nonlinear waveguide part 11 is reduced to several cm by reducing processes for having adverse effects. By modeling, by the grating of the length of about 20 cm, the compression factor of 5 is achieved by initial 60 ps pulses. |
