CN209844967U - Hybrid amplifier - Google Patents
Hybrid amplifier Download PDFInfo
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- CN209844967U CN209844967U CN201921096002.XU CN201921096002U CN209844967U CN 209844967 U CN209844967 U CN 209844967U CN 201921096002 U CN201921096002 U CN 201921096002U CN 209844967 U CN209844967 U CN 209844967U
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Abstract
The utility model provides a hybrid amplifier, which comprises a signal input end, an optical isolator, a first signal pump combiner, an erbium-doped fiber, a fiber circulator, a reverse dispersion fiber, a second signal pump combiner, a signal output end and a pump source; the signal input end is connected with one end of an optical isolator, the other end of the optical isolator is connected with the signal end of a first signal pumping wave combiner, the reflection end of the first signal pumping wave combiner is connected with the reflection end of a second signal pumping wave combiner, the common end of the first signal pumping wave combiner is connected with one end of an erbium-doped fiber, the other end of the erbium-doped fiber is connected with the second end of an optical fiber circulator, the first end of the optical fiber circulator is connected with a pumping source, the third end of the optical fiber circulator is connected with one end of a reverse dispersion optical fiber, the other end of the reverse dispersion optical fiber is connected with the common end of the second signal pumping wave combiner, and the signal end of the second signal pumping wave combiner is connected; the hybrid amplifier has a wide bandwidth spectrum and also has a dispersion compensation effect.
Description
Technical Field
The utility model relates to an optical amplifier, especially a mixed amplifier who uses in being arranged in optical communication and optical transmission system.
Background
In the early 90 s, erbium-doped fiber amplifiers (EDFAs) were successfully developed; the low-noise amplifier has low noise, good gain curve, large amplifier bandwidth, high pumping efficiency, stable working performance and mature technology, is compatible with a wavelength division multiplexing WDM system, and is favored in modern long-distance wavelength division multiplexing optical fiber communication systems; however, the gain spectrum of the EDFA can only cover the C-band 1529-1561nm and the L-band 1570-1610 nm. And the quartz single-mode fiber has a bandwidth of dozens of THz (40 nm) in a low-loss window of a 1.55 mu m wave band, and is far from being fully utilized. The presence of a Raman Fiber Amplifier (RFA) compensates for this drawback, which theoretically can amplify signals of any wavelength, provided that there is a suitable pump light source. However, due to the low stimulated raman scattering efficiency, RFA requires a higher power pump source and therefore is relatively costly, which determines that RFA does not completely replace EDFA at the present stage. The EDFA and the RFA are combined to form the hybrid fiber amplifier, so that the bandwidth of the amplifier can be increased, the signal-to-noise ratio is improved, the unrepeatered distance is prolonged, and the hybrid fiber amplifier is a good solution. However, when a single-mode optical fiber is used as the raman amplifier, the gain factor is small, dispersion accumulation is caused, and the signal pulse is spread and the quality of the transmission signal is deteriorated when the signal is transmitted over a long distance. If the raman amplifier adopts a Dispersion Compensation Fiber (DCF), the loss is large, the nonlinear coefficient is large, the nonlinear distortion of signals is serious, and the long-distance transmission is not facilitated.
Disclosure of Invention
To exist not enough among the prior art, the utility model provides a hybrid amplifier has assembled raman fiber amplifier and erbium-doped fiber amplifier's advantage, has both had wide bandwidth spectrum, has the dispersion compensation effect again, can compensate the chromatic dispersion that causes among the fiber transmission process. The utility model adopts the technical proposal that:
a hybrid amplifier comprises a signal input end, an optical isolator, a first signal pumping wave combiner, an erbium-doped optical fiber, an optical fiber circulator, a reverse dispersion optical fiber, a second signal pumping wave combiner, a signal output end and a pumping source;
the signal input end is connected with one end of an optical isolator, the other end of the optical isolator is connected with the signal end of a first signal pumping wave combiner, the reflection end of the first signal pumping wave combiner is connected with the reflection end of a second signal pumping wave combiner, the common end of the first signal pumping wave combiner is connected with one end of an erbium-doped fiber, the other end of the erbium-doped fiber is connected with the second end of an optical fiber circulator, the first end of the optical fiber circulator is connected with a pumping source, the third end of the optical fiber circulator is connected with one end of a reverse dispersion optical fiber, the other end of the reverse dispersion optical fiber is connected with the common end of the second signal pumping wave combiner, and the signal end of the second signal pumping wave combiner is connected;
the transmission direction of the optical fiber circulator is along the first end- > the second end- > the third end;
the pump source comprises a single pump laser or a plurality of pump lasers with different wavelengths.
Further, the wavelength of a single pump laser in the pump source is 1480nm, or pump lasers with four different wavelengths, which are 1410nm, 1425nm, 1455nm and 1480nm, respectively, are included.
Furthermore, the dispersion compensation coefficient of the inverse dispersion fiber is-40 to-45 ps/nm.km.
Further, the Raman gain coefficient of the reverse dispersion fiber is 1.3W-1/km。
Further, the length of the inverse dispersion fiber is 4-6 km.
Furthermore, the length of the erbium-doped fiber is 5-6 m, and the absorption coefficient at 1530nm is 6.3 dB/m.
The utility model has the advantages that:
1) the hybrid amplifier has a broad bandwidth spectrum.
2) The inverse dispersion fiber applied to the amplification system has a dispersion compensation function and can compensate line dispersion.
3) The amplifier noise figure can be reduced.
Drawings
Fig. 1 is a schematic view of the structure of the present invention.
Detailed Description
The invention is further described with reference to the following specific drawings and examples.
As shown in fig. 1, a hybrid amplifier includes a signal input terminal 1, an optical isolator 2, a first signal pump combiner 3, an erbium-doped fiber 4, a fiber circulator 5, a reverse dispersion fiber 6, a second signal pump combiner 7, a signal output terminal 8, and a pump source 9;
the signal input end 1 is connected with one end of an optical isolator 2, the other end of the optical isolator 2 is connected with a signal end of a first signal pump combiner 3, the reflection end of the first signal pump combiner 3 is connected with the reflection end of a second signal pump combiner 7, the common end of the first signal pump combiner 3 is connected with one end of an erbium-doped fiber 4, the other end of the erbium-doped fiber 4 is connected with the second end of a fiber circulator 5, the first end of the fiber circulator 5 is connected with a pump source 9, the third end of the fiber circulator 5 is connected with one end of a reverse dispersion fiber 6, the other end of the reverse dispersion fiber 6 is connected with the common end of the second signal pump combiner 7, and the signal end of the second signal pump combiner 7 is connected with a signal output end 8;
the transmission direction of the optical fiber circulator 5 is along the first end- > the second end- > the third end;
the pump source 9 comprises a single pump laser or a plurality of pump lasers with different wavelengths; for example, the wavelength of a single pump laser in the pump source 9 is 1480nm, or pump lasers with four different wavelengths, the wavelengths are 1410nm, 1425nm, 1455nm, and 1480 nm;
the hybrid amplifier can form an L-band (1570 nm-1610 nm) amplifier or a C + L-band (1529-1610 nm) amplifier;
the first stage of the hybrid amplifier is an erbium-doped fiber amplifier, signal light enters an erbium-doped fiber 4 through a signal input end 1, an optical isolator 2 and a first signal pumping combiner 3, and pumping light enters the erbium-doped fiber 4 after entering from a first end and outputting from a second end of an optical fiber circulator 5, so that a reverse pumping mode is formed;
the length of the erbium-doped fiber 4 is 5-6 m, and the absorption coefficient at 1530nm is 6.3 dB/m;
the second stage of the hybrid amplifier is a Raman fiber amplifier, and the signal light amplified by the first stage amplifier enters from the second end and the third end of the fiber circulator 5 and enters into the inverse dispersion fiber 6; the residual pumping light in the first stage enters a reverse dispersion optical fiber 6 through the reflection end of a first signal pumping wave combiner 3 and the reflection end of a second signal pumping wave combiner 7 (the reflection ends of the two wave combiners are directly welded together) to form a reverse pumping mode;
the length of the inverse dispersion optical fiber 6 is 4-6 km; for example, 5km, a dispersion compensation coefficient of-40 to-45 ps/nm.km, and an attenuation coefficient of 0.23dB/km at 1550 nm; the effective area is 32 square microns; cut-off wavelength of 1333nm and Raman gain coefficient of 1.3W-1/km；
The inverse dispersion optical fiber 6 can compensate chromatic dispersion caused in the optical fiber transmission process and has a larger Raman gain coefficient than a common single mode optical fiber; the effective area is larger than the effective area (19 square microns) of the dispersion compensation optical fiber, and the nonlinear coefficient is only 3.53W-1The nonlinear effect is reduced, signal distortion is not easy to cause, and long-distance transmission is facilitated.
Compared with the traditional optical fiber amplifier, the inverse dispersion optical fiber has the advantages of small loss in signal transmission wave band, high Raman gain coefficient, large effective area, small nonlinear coefficient and the like. A hybrid amplifier formed by utilizing a reverse dispersion fiber and an erbium-doped fiber belongs to a discrete lumped amplifier, can obtain higher gain and is convenient for realizing centralized amplification and compensation on small signals. The hybrid amplifier combines the advantages of raman amplification and erbium-doped amplifiers.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.
Claims (6)
1. A hybrid amplifier is characterized by comprising a signal input end (1), an optical isolator (2), a first signal pumping wave combiner (3), an erbium-doped optical fiber (4), an optical fiber circulator (5), a reverse dispersion optical fiber (6), a second signal pumping wave combiner (7), a signal output end (8) and a pumping source (9);
the signal input end (1) is connected with one end of the optical isolator (2), the other end of the optical isolator (2) is connected with the signal end of the first signal pump wave combiner (3), the reflection end of the first signal pump wave combiner (3) is connected with the reflection end of the second signal pump wave combiner (7), the common end of the first signal pump wave combiner (3) is connected with one end of the erbium-doped fiber (4), the other end of the erbium-doped fiber (4) is connected with the second end of the fiber circulator (5), the first end of the fiber circulator (5) is connected with the pump source (9), the third end of the fiber circulator (5) is connected with one end of the inverse dispersion fiber (6), the other end of the inverse dispersion fiber (6) is connected with the common end of the second signal pump wave combiner (7), and the signal output end (8) of the second signal pump wave combiner (7);
the transmission direction of the optical fiber circulator (5) is along the first end- > the second end- > the third end;
the pump source (9) comprises a single pump laser or a plurality of pump lasers with different wavelengths.
2. The hybrid amplifier of claim 1,
the wavelength of a single pump laser in the pump source (9) is 1480nm, or the pump laser comprises four different wavelengths, wherein the wavelengths are 1410nm, 1425nm, 1455nm and 1480nm respectively.
3. The hybrid amplifier of claim 1,
the dispersion compensation coefficient of the inverse dispersion fiber (6) is-40 to-45 ps/nm.km.
4. The hybrid amplifier of claim 1,
the Raman gain coefficient of the reverse dispersion optical fiber (6) is 1.3W-1/km。
5. The hybrid amplifier of claim 1,
the length of the inverse dispersion fiber (6) is 4-6 km.
6. The hybrid amplifier of claim 1,
the length of the erbium-doped fiber (4) is 5-6 m, and the absorption coefficient at 1530nm is 6.3 dB/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096002.XU CN209844967U (en) | 2019-07-12 | 2019-07-12 | Hybrid amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921096002.XU CN209844967U (en) | 2019-07-12 | 2019-07-12 | Hybrid amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209844967U true CN209844967U (en) | 2019-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921096002.XU Active CN209844967U (en) | 2019-07-12 | 2019-07-12 | Hybrid amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209844967U (en) |
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2019
- 2019-07-12 CN CN201921096002.XU patent/CN209844967U/en active Active
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