Patent ID: 6888670

Claim:
A hybrid-type low-noise dispersion compensating optical fiber amplifier comprising: a first optical fiber amplifier having a pre-stage optical fiber, and a first coupler for supplying pump light to the pre-stage optical fiber; a dispersion compensating Raman amplifier (DCRA) connected to the first optical fiber amplifier, the DCRA including a dispersion compensating optical fiber (DCF) that compensates for the dispersion accumulated in an optical line and generates a Raman gain, and a second coupler for supplying Raman pump light onto the DCF; and a second optical fiber amplifier connected to the DCRA, and including a post-stage optical fiber and a third coupler for supplying pump light onto the post-stage optical fiber, wherein a gain of the first optical fiber amplifier is adjusted so as not to operate the DCRA in a non-linear region, while the length of the pre-stage optical fiber and the intensity of pump light supplied to the pre-stage optical fiber are adjusted to operate the first optical fiber amplifier in a non-saturation region.