| 摘要 |
Tunable light source (10) with a tunable resonator (20) which comprises: a multiple resonator (20) constituted by at least three resonant elements (21,22,23) that oscillates with a wavelength where frequencies of three or more resonant elements (21,22,23) with shifted free spectral ranges intersect; and a tunable device (6,16,17) for controlling the resonant wavelength of the multiple resonator (20) by simultaneously changing the respective optical path lengths of a plurality of the resonant elements (22,23). The multiple resonator has a structure in which three resonant elements (21,22,23) are connected in series; and provided that the optical path lengths of the resonant elements are L 0 , L 1 , L 2 , Vernier orders are M 1 >1, M 2 > 1, the optical path lengths are defined as L 1 = M 1 M 1 - 1 L 0 , L 2 = M 2 M 2 - 1 L 0 , phase amount "Phase" is the changed optical path length standardized by one-wavelength of the optical path length, and the respective phase amount "Phase" of the two ring resonant elements (22,23) whose optical path lengths are to be changed are defined as "Phase M1 " and "Phase M2 ", the tunable device controls the increase/decrease amount of the phase amount "Phase M1 " and "Phase M2 " based on a linear function with a slope of M 2 - 1 M 1 - 1 . |
