Optical amplifying device and semiconductor optical amplifier
专利汇可以提供Optical amplifying device and semiconductor optical amplifier专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain a constant gain even if ambient temperature varies and to constitute the optical amplifying device by a simple optical system by controlling a current applied to the semiconductor optical amplifier so that the photodetection level of a photodetector reaches a reference value.
CONSTITUTION: The semiconductor optical amplifier 100 has a nearly proportional relation between the gain and naturally emitted light intensity and when the amplifier is driven with, for example, a constant current, the naturally emitted light intensity decreases if the gain decreases although the ambient temperature rises. For the purpose, this naturally emitted light intensity is monitored and a controller 300 varies the driving current of the semiconductor optical amplifier 100 so that the monitored value reach the reference value, the gain can be held nearly constant. Naturally emitted light is emitted from an active layer 130 in all directions, so the photodetector can photodetect the light even if arranged shifting from the optical axis. Consequently, even if the ambient temperature varies, the nearly constant gain is obtained and the constitution of the device which controls the gain by monitoring the naturally emitted light of the semiconductor optical amplifier is simplified.
COPYRIGHT: (C)1990,JPO&Japio，下面是Optical amplifying device and semiconductor optical amplifier专利的具体信息内容。
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