Optical amplification module, optical amplifier, optical communication system, and white light source

An optical amplification module having an amplification band within a range of 1490 nm to 1520 nm, comprising:

• an Er-doped optical waveguide having an optical waveguide region doped with Er;
• and
• a temperature adjustor for maintaining temperature of said Er-doped optical waveguide at room temperature or more.

An optical amplification module having an amplification band within a range of 1490 nm to 1520 nm, said optical amplification module including an Er-doped optical waveguide having an optical waveguide regoin co-doped with Al2O3 and P2O5 together with Er.

An optical amplifier having an amplification band within a range of 1490 nm to 1520 nm, comprising:

• an Er-doped optical waveguide having an optical waveguide region doped with Er;
• and
• a pumping light supply system for supplying pumping light of a 0.98 μm band not greater than the wavelength of 976 nm, into said Er-doped optical waveguide.