| 摘要 |
A distributed feedback semiconductor laser is provided with an optical waveguide having first and second straight-bar portions and a bending portion. The pitch of the grating in the case of light passing through the bending portion is a little longer than that in the case of light passing through the first and second straight-bar portion in order to shift the phase of the light transmitted along the optical waveguide by lambda /4 where lambda is the oscillation wavelength, thereby generating single longitudinal mode laser light.
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