Optical amplifier for amplifying multi-wavelength light
AssigneeFujitsu Limited
InventorsMiki Onaka, Yasushi Sugaya, Etsuko Hayashi, Norifumi Shukunami, Manabu Watanabe
Life of this patent
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Abstract
Multi-wavelength light is inputted to an erbium-doped fiber as an optical amplification medium. Pump light is supplied to this erbium-doped fiber. When a transition from a state signal light on the short wavelength area in the multi-wavelength is input in the erbium-doped fiber to a state the signal light is not input, the output power of signal light on the long wavelength area in the multi-wavelength light can vary. The wavelength of pump light is selected in such a way that the output power of the signal light on the long wavelength area can not be negative when the power varies.
Claims14
An optical amplifier for amplifying wavelength division multiplexed (WDM) light having first signal light and second signal light, comprising:
- an optical fiber used as an optical amplification medium to amplify the WDM light;
- and
- a pump light source supplying the optical fiber with pump light, wherein
- a minimum distance that the pump light is propagated in the optical fiber is determined based on a power deviation of the second signal light output from the optical fiber not exceeding a predetermined threshold, when a transition occurs from a state in which the first signal light is input into the optical fiber to a state in which the first signal light is not substantially input into the optical fiber.
An optical amplifier for amplifying wavelength division multiplexed (WDM) light having first signal light and second signal light, comprising:
- an optical fiber used as an optical amplification medium to amplify the WDM light;
- and
- a pump light source supplying the optical fiber with pump light, wherein
- a minimum distance that the pump light is propagated in the optical fiber is determined based on a power deviation of the second signal light output from the optical fiber not exceeding a predetermined threshold, when a power of the first signal light in the WDM light is reduced.
An optical amplifier for amplifying wavelength division multiplexed (WDM) light having first signal light and second signal light, comprising:
- an optical fiber used as an optical amplification medium to amplify the WDM light;
- and
- a pump light source supplying the optical fiber with pump light, wherein
- a minimum inversion population ratio at an output end of the optical fiber is determined based on a power deviation of the second signal light output from the optical fiber not exceeding a predetermined threshold, when a transition occurs from a state in which the first signal light is input into the optical fiber to a state in which the first signal light is not substantially input into the optical fiber.
An optical amplifier for amplifying wavelength division multiplexed (WDM) light having first signal light and second signal light, comprising:
- an optical fiber used as an optical amplification medium to amplify the WDM light;
- and
- a pump light source supplying the optical fiber with pump light, wherein
- a minimum inversion population ratio at an output end of the optical fiber is determined based on a power deviation of the second signal light output from the optical fiber not exceeding a predetermined threshold, when a power of the first signal light in the WDM light reduced.
An optical transmission system having a plurality of optical amplifiers to amplify wavelength division multiplexed (WDM) light between a transmitter and a receiver, each of at least one of the plurality of optical amplifiers comprising:
- an optical fiber used as an optical amplification medium to amplify the WDM light;
- and
- a pump light source supplying the optical fiber with pump light, wherein
- a minimum distance that the pump light is propagated in the optical fiber or a minimum inversion population ratio at an output end of the optical fiber is determined based on a power deviation of the second signal light output from the optical fiber not exceeding a predetermined threshold, when a transition occurs from a state in which the first signal light is input into the optical fiber to a state in which the first signal light is not substantially input into the optical fiber.
Dependencies are inferred from the claim text.