Light source with WDM function, and optical amplifier and two-way optical transmission apparatus applied therewith

A two-way optical transmission apparatus, comprising:

• a first light source device;
• and
• a second light source device,
• wherein said first light source device comprises:
• a first light source for outputting a light having a first wavelength;
• a first lens for converting the light having the first wavelength into a collimated beam;
• a first optical input/output terminal for receiving the light having the first wavelength and outputting a light having a second wavelength;
• a second lens for converting the light having the second wavelength into a collimated beam;
• a first optical filter, provided between said first lens and said second lens, for passing the light having the first wavelength, and reflecting the light having the second wavelength;
• and
• a first optical input terminal for receiving the light having the second wavelength,
• wherein said second light source device comprises:
• a second light source for outputting a light having a second wavelength;
• a third lens for converting the light having the second wavelength into a collimated beam;
• a second optical input/output terminal for receiving the light having the second wavelength and outputting a light having the first wavelength;
• a fourth lens for converting the light having the first wavelength into a collimated beam;
• a second optical filter, provided between said third lens and said fourth lens, for passing the light having the second wavelength, and reflecting the light having the first wavelength, and
• a second optical input terminal for receiving the light having the first wavelength;
• and
• said two-way optical transmission apparatus further comprises:
• a first receiving optics, connected to said first optical input terminal of said first light source device, for receiving and converting the light having the second wavelength into an electrical signal;
• a second receiving optics, connected to said second optical input terminal of said second light source device, for receiving and converting the light having the first wavelength into an electrical signal;
• and
• a transmission line optical fiber for connecting said first optical input/output terminal of said first optical transmission/reception device to said second optical input/output terminal of said second optical transmission/reception device,
• wherein said transmission line optical fiber comprises a rare earth doped optical fiber, and
• wherein said first optical input terminal couples said light having the first wavelength collected by said second lens with said light having the second wavelength on a surface of said rare earth doped optical fiber.