| 摘要 |
PROBLEM TO BE SOLVED: To control an optical signal level with high accuracy by using a semiconductor optical amplifier without performing constant temperature control.SOLUTION: An optical amplifying device comprises a semiconductor optical amplifier, a first detector for detecting input optical power of the semiconductor optical amplifier, a second detector for detecting output optical power of thee semiconductor optical amplifier and a controller for controlling a driving current of the semiconductor optical amplifier. The controller supplies a predetermined driving current to the semiconductor optical amplifier when an optical signal is not input to the semiconductor optical amplifier. The second detector detects light power of ASE (Amplified Spontaneous Emission) output from the semiconductor optical amplifier when a predetermined driving current is supplied to the semiconductor optical amplifier. The driving current of the semiconductor optical amplifier is controlled based on input light power of the semiconductor optical amplifier and light power of ASE which are detected by the first detector.SELECTED DRAWING: Figure 7 |
