| 摘要 |
The light-emitting module 1a comprises a semiconductor light-emitting device 16, a first optical detector 20a for monitoring magnitude of light emitted from the semiconductor device, a second optical detector 20b for monitoring a oscillation wavelength of the semiconductor device, and an Ethalon. The first detector 20a locates in the position where the wavelength variation of the transmitted light from the Ethalon is relatively small, while the second detector locates in the position where the wavelength variation of the transmitted light is relatively large. The geometrical size of the second detector along the first direction is wider than that along the second direction normal to the first direction, thus enhances the efficiency of the sensitivity for the wavelength.
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