Transient gain cancellation for optical amplifiers
US-9509113-B2 · Nov 29, 2016 · US
Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied
US9007680B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9007680-B2 |
| Application number | US-201314018986-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 5, 2013 |
| Priority date | May 2, 1996 |
| Publication date | Apr 14, 2015 |
| Grant date | Apr 14, 2015 |
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Abstract
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An optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength division multiplexed optical signal; a variable optical attenuator which controls a level of the first optical amplifier amplified wavelength division multiplexed optical signal and outputs the controlled wavelength division multiplexed optical signal; a second optical amplifier which amplifies the controlled wavelength division multiplexed optical signal and outputs the amplified, controlled wavelength division multiplexed optical signal; and a controller which controls the wavelength division multiplexed optical signal to be amplified with a constant gain.
First claim
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The invention claimed is: 1. An apparatus comprising: an optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal, the optical amplifier including: a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength division multiplexed optical signal, a variable optical attenuator which controls a level of the first optical amplifier amplified wavelength division multiplexed optical signal and outputs the controlled wavelength division multiplexed optical signal, a second optical amplifier which amplifies the controlled wavelength division multiplexed optical signal and outputs the amplified, controlled wavelength division multiplexed optical signal, and a controller which controls the wavelength division multiplexed optical signal to be amplified with a constant gain. 2. An apparatus as in claim 1 , wherein the optical amplifier amplifies the wavelength division multiplexed optical signal with a constant gain during variation of the number of channels in the wavelength division multiplexed optical signal. 3. An apparatus as in claim 1 , wherein an attenuation level of the variable optical attenuator is changed to control the level of the amplified wavelength division multiplexed optical signal. 4. An apparatus comprising: an optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified wavelength division multiplexed optical signal, the optical amplifier including: a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength division multiplexed optical signal, a variable optical attenuator which controls a level of the first optical amplifier amplified wavelength division multiplexed optical signal and outputs the controlled wavelength division multiplexed optical signal, a second optical amplifier which amplifies the controlled wavelength division multiplexed optical signal and outputs the amplified, controlled wavelength division multiplexed optical signal, and a controller which controls the wavelength division multiplexed optical signal to be amplified with a constant gain. 5. An apparatus as in claim 4 , wherein the optical amplifier amplifies the wavelength division multiplexed optical signal with a constant gain during variation of the number of channels in the wavelength division multiplexed optical signal. 6. An apparatus as in claim 4 , wherein an attenuation level of the variable optical attenuator is changed to control the level of the amplified wavelength division multiplexed optical signal.
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Classifications
in optical amplifiers · CPC title
by controlling the optical pumping · CPC title
Devices including multiple stages, e.g., multi-stage optical amplifiers or dispersion compensators · CPC title
- H04B10/296Primary
Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input power · CPC title
by monitoring or controlling, e.g. attenuating, the input signal · CPC title
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- What does patent US9007680B2 cover?
- An optical amplifier which amplifies a wavelength division multiplexed optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes a first optical amplifier which amplifies the wavelength division multiplexed optical signal and outputs the first optical amplifier amplified wavelength divis…
- Who is the assignee on this patent?
- Fujitsu Ltd
- What technology area does this patent fall under?
- Primary CPC classification H04B10/296. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 14 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).