Patent ID: 6335821
Filing Date: 2002-01-01
Classification: H01S

Abstract:
An optical fiber amplifier comprising:an erbium-doped optical fiber to which a multiplexed optical signal into which a plurality of optical signals in a long-wavelength band are multiplexed is supplied and which is operable to perform amplification in the long-wavelength band; a forward-pumping light source operable to supply forward-pumping light to said erbium-doped optical fiber; a backward-pumping light source operable to supply backward-pumping light to said erbium-doped optical fiber, said backward-pumping light source having an output power which is variable based on a control signal; an input-power detector operable to detect an input power of the multiplexed optical signal input to said erbium-doped optical fiber; a temperature detector operable to detect a temperature of said erbium-doped optical fiber; and a control circuit operable to output the control signal based on the input power detected by said input-power detector and the temperature detected by said temperature detector, the control signal changing the output power of said backward-pumping light source to cancel deviation of the amplification of the multiplexed optical signal.