WO1998006191B1 - Automatic feedback gain control in a doped fiber amplifier - Google Patents
Automatic feedback gain control in a doped fiber amplifierInfo
- Publication number
- WO1998006191B1 WO1998006191B1 PCT/US1997/013470 US9713470W WO9806191B1 WO 1998006191 B1 WO1998006191 B1 WO 1998006191B1 US 9713470 W US9713470 W US 9713470W WO 9806191 B1 WO9806191 B1 WO 9806191B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- amplifier
- wavelength
- optical
- doped fiber
- feedback
- Prior art date
Links
- 239000000835 fiber Substances 0.000 title claims abstract 15
- 230000003287 optical effect Effects 0.000 claims abstract 37
- 238000000034 method Methods 0.000 claims abstract 3
- 238000013016 damping Methods 0.000 claims 2
- 239000013307 optical fiber Substances 0.000 claims 2
- 230000010355 oscillation Effects 0.000 claims 2
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract 3
- 230000001419 dependent effect Effects 0.000 abstract 1
Abstract
An apparatus and method for controlling the gain in an erbium-doped fiber amplifier (EDFA) incorporated into a multi-wavelength communication system so as to amplify each of the wavelength signals. The amplifier operates near to saturation so that, if one or more of the multi-wavelength signals is removed from the transmission, the remaining channels are increasingly amplified, leading to problems with other components in the system which depend upon intensity. According to the invention, an optical signal at a wavelength that is not within any of the transmission channels is selectively fed back around the amplifier and caused to lase in a wavelength-filtered ring-laser configuration. The lasing signal governs the saturation of the amplifier such that any gain shed by a disappearing data signal is predominately used by the lasing signal, not by the remaining data signals. Thereby, the data signals do not experience gain variations dependent upon the number of data signals being amplified. In a chain of amplifiers on a long link, the wavelength of the lasing signal is chosen to lie within the gain flat band of the amplifier and is output from the equalized amplifier with the same efficiency as all the transmission signals to be received by the next amplifier. Thereby, only the first amplifier needs to be equalized.
Claims
1. A stabilized optical amplifier, comprising: an optical amplifier receiving an optical data signal of one or more wavelengths on an input side, amplifying said signal, and outputting it on an output side; first and second wavelength-selective optical couplers connected respectively to said input and output sides, respectively to input and output optical channels, and to ends of an optical feedback path included in a feedback loop including said optical amplifier, wherein said wavelength-selective optical couplers block said optical data signal from said feedback loop relative to a feedback signal having a feedback wavelength other than said one or more wavelengths of said optical data signal; and optical attenuation included in said feedback loop and, together with said wavelength-selective couplers, selectively attenuating said feedback signal; and wherein said feedback loop includes a wavelength-selective coupler at said input side of said optical amplifier and a wavelength-insensitive coupler at said output side of said optical amplifier.
2. The amplifier of Claim 1, wherein said optical amplifier is a doped fiber amplifier.
3. The amplifier of Claim 2, wherein said optical attenuation includes a variable attenuator included in said feedback path.
4. The amplifier of Claim 1, wherein said optical data signal comprises a wavelength-division multiplexed signal of multiple channels assigned to a plurality of WDM wavelengths different from said feedback wavelength, whereby said amplifier compensates for a varying number of active ones of said channels.
5. A stabilized optical amplifier in a wavelength-division multiplexed optical network having a variable number of N or less wavelength channels of respective WDM wavelengths conveyed to said amplifier, comprising: a doped fiber amplifier receiving said wavelength channels to be occupied and having a flat gain wavelength band excluding a principal peak of amplifier stimulated emission; and an optical feedback loop including an attenuator connected around and through said optical amplifier selectively passing a feedback signal having a feedback wavelength other than those of said wavelength channels; wherein said WDM wavelengths and said feedback wavelength are located within said flat gain wavelength band of said doped fiber amplifier; and said feedback wavelength has a value intermediate values of said WDM wavelengths.
6. The amplifier of Claim 5, wherein said attenuator is set so that said feedback signal lases when all of said N wavelength channels are being received by said amplifier.
7. The amplifier of Claim 5, wherein said doped fiber amplifier is an erbium- doped fiber amplifier.
8. A wavelength-division multiplexed optical link, comprising a plurality of optical amplifiers serially connected along an optical fiber link, wherein a first of said serially connected amplifiers includes a feedback loop selective to a selected wavelength and capable of lasing a signal of said selected wavelength together with said first amplifier, a portion of said lasing signal being output from said first amplifier toward a second one of said serially connected amplifiers; and wherein at least some amplifier other than said first amplifier does not include such a feedback loop.
9. The optical link of Claim 8, wherein said optical amplifier comprises a doped fiber amplifier.
10. The optical link of Claim 9, wherein said doped fiber amplifier includes a flat gain wavelength band occupied by said selected wavelength and by a plurality of wavelengths assigned to plural channels in a wavelength-division multiplexed optical signal.
11. The optical link of Claim 10, wherein said selected wavelength is disposed between said plurality of wavelengths.
12. The optical link of Claim 8, wherein said optical fiber link carries a plurality of wavelength-division multiplexed signals having respective wavelengths falling within a flat band portion of said first amplifier and wherein said selected wavelength falls within said flat band portion.
13. The optical link of Claim 8, wherein said feedback loop includes wavelength-insensitive couplers at input and output ends of said optical amplifier.
14. The optical link of Claim 13, wherein said feedback loop includes a filter selectively passing said selected wavelength.
15. The optical link of Claim 14, wherein said feedback loop additionally includes a controlled attenuator.
16. The optical link of Claim 8, wherein said feedback loop includes a wavelength-selective coupler at an input end of said optical amplifier and a wavelength-insensitive coupler at an output end of said optical amplifier.
17. A method of stabilizing gain in a doped fiber amplifier, comprising the steps of: a first step of inputting to an amplifier system one or more first signals selected from a plurality of wavelength-division multiplexed signals, said amplifier system including a doped fiber amplifier and a feedback loop for feeding back through said doped fiber amplifier a feedback signal different from said first signals. a second step of inputting to said amplifier system one or more second signals selected from said plurality of wavelength-division multiplexed signals, wherein said first and second signals differ by one or more third signals; and between said first and second inputting steps, varying an optical intensity of said one or more third signals over a time period longer than a characteristic oscillation damping period of said doped fiber amplifier.
18. The method of Claim 17, wherein said doped fiber amplifier is an erbium- doped fiber amplifier and said characteristic oscillation damping period is 20μs.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU54240/98A AU5424098A (en) | 1996-07-30 | 1997-07-24 | Automatic feedback gain control in a doped fiber amplifier |
| JP10508054A JP2000515688A (en) | 1996-07-30 | 1997-07-24 | Automatic feedback gain control of doped fiber amplifiers. |
| EP97948105A EP1008238A2 (en) | 1996-07-30 | 1997-07-24 | Automatic feedback gain control in a doped fiber amplifier |
| CA002261873A CA2261873A1 (en) | 1996-07-30 | 1997-07-24 | Automatic feedback gain control in a doped fiber amplifier |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/688,588 | 1996-07-30 | ||
| US08/688,588 US6175436B1 (en) | 1996-07-30 | 1996-07-30 | Automatic feedback gain control for multiple channels in a doped optical fiber amplifier |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO1998006191A2 WO1998006191A2 (en) | 1998-02-12 |
| WO1998006191A3 WO1998006191A3 (en) | 1998-04-16 |
| WO1998006191B1 true WO1998006191B1 (en) | 1998-06-11 |
Family
ID=24765008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/013470 WO1998006191A2 (en) | 1996-07-30 | 1997-07-24 | Automatic feedback gain control in a doped fiber amplifier |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6175436B1 (en) |
| EP (1) | EP1008238A2 (en) |
| JP (1) | JP2000515688A (en) |
| AU (1) | AU5424098A (en) |
| CA (1) | CA2261873A1 (en) |
| WO (1) | WO1998006191A2 (en) |
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| US9432172B2 (en) | 1997-12-05 | 2016-08-30 | Rembrandt Wireless Technologies, Lp | System and method of communication using at least two modulation methods |
| DE69801663T2 (en) * | 1998-10-13 | 2002-06-20 | Lucent Technologies Inc., Murray Hill | Method and device for the optical power control of an optical transmission signal |
| FR2784825B1 (en) * | 1998-10-15 | 2000-12-15 | Cit Alcatel | POWER EQUALIZATION IN A WAVELENGTH MULTIPLEXING TRANSMISSION SYSTEM HAVING A PLURALITY OF AMPLIFIERS |
| BR9915045A (en) * | 1998-11-02 | 2001-07-17 | Pirelli Cavi E Sistemi Spa | Amplified multi-wavelength telecommunications system with gain compensation |
| US6347008B1 (en) | 1999-06-14 | 2002-02-12 | Tellium, Inc. | Optical amplifier system and optical network having flattened gain and constant per channel output power |
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| US6600593B2 (en) * | 1999-12-21 | 2003-07-29 | Tellabs Denmark A/S | Method and an apparatus for amplitude equalization of a plurality of optical signals |
| GB2363675B (en) * | 2000-01-19 | 2004-05-26 | Advantest Corp | Wideband optical amplifier and wideband variable wavelength optical source |
| AU2001236350A1 (en) * | 2000-01-21 | 2001-07-31 | Corning Incorporated | Hybrid gain control on optical amplifiers |
| FR2805944B1 (en) * | 2000-03-03 | 2002-05-31 | Cit Alcatel | WAVELENGTH MULTIPLEXED TRANSMISSION SYSTEM WITH DISSYMMETRIC FILTERING |
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| WO2017150382A1 (en) * | 2016-02-29 | 2017-09-08 | 国立大学法人東京工業大学 | Surface light emitting laser |
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-
1996
- 1996-07-30 US US08/688,588 patent/US6175436B1/en not_active Expired - Fee Related
-
1997
- 1997-07-24 EP EP97948105A patent/EP1008238A2/en not_active Withdrawn
- 1997-07-24 JP JP10508054A patent/JP2000515688A/en active Pending
- 1997-07-24 WO PCT/US1997/013470 patent/WO1998006191A2/en not_active Application Discontinuation
- 1997-07-24 CA CA002261873A patent/CA2261873A1/en not_active Abandoned
- 1997-07-24 AU AU54240/98A patent/AU5424098A/en not_active Abandoned
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