| 摘要 |
A distributed feedback laser comprising a guide layer is disclosed and includes a plurality of waveguides connected in a stepped multi-branch structure, the guide layer serving as a transmission medium for light having a predetermined wavelength, and an active layer, formed on the guide layer, for oscillating light, wherein light is branched according to a predetermined ratio while proceeding from a higher waveguide to a lower waveguide within the guide layer.
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