| 摘要 |
A light emitting apparatus has a light generating portion, an output, and an optical isolator. The light generating portion includes a semiconductor optical amplifier and a grating fiber. The semiconductor optical amplifier has a light emitting surface and a light reflecting surface, and the grating fiber has a first end optically coupled to the light emitting surface, and a grating provided in its core part. The output is designed to provide light generated in the light generating portion. An optical isolator is placed between the light generating portion and the output. In the light emitting apparatus, the isolation of the optical isolator is specified to be not less than -52.4-8.7xlog(BER) in dB with respect to a bit error rate BER to be achieved at the transmission rate of 2.5 Gbps in the 1.55-mum band.
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