Patent ID: 8249405
Filing Date: 2012-08-21
Classification: G02B,G02F,H01S

Abstract:
1. A variable wavelength light source, comprising: a multiple resonator including a plurality of ring resonators having throughports, which have different circumference lengths from each other and are coupled mutually; a plurality of photodetectors which detect light powers outputted via the respective throughports of the plurality of ring resonators; a plurality of variable light units for changing transmittance of the multiple resonator by individually working on the plurality of resonators; a light input/output unit which supplies light to the multiple resonator and emits light returned from the multiple resonator towards outside; a control unit which controls the plurality of variable light units based on the light powers detected by the photodetectors; and light attenuators provided between the throughports and the photodetectors for attenuating the light emitted from the throughports before making incident on the photodetectors.