| 20100238539 | OPTICAL SIGNAL AMPLIFYING APPARATUS - An optical signal amplifying apparatus feeding back surrounding light to perform negative feedback optical amplification of a semiconductor optical amplifier is provided that enables a coupling structure to be simplified and miniaturized between the semiconductor optical amplifier and an optical fiber transmitting the output light from the semiconductor optical amplifier by using a fiber grating device. Since a first optical fiber grating device FGD | 09-23-2010 |
