CN2766265Y - Raman fibre amplifier capable of protecting optical fibre end face - Google Patents
Raman fibre amplifier capable of protecting optical fibre end face Download PDFInfo
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- CN2766265Y CN2766265Y CNU2004200766370U CN200420076637U CN2766265Y CN 2766265 Y CN2766265 Y CN 2766265Y CN U2004200766370 U CNU2004200766370 U CN U2004200766370U CN 200420076637 U CN200420076637 U CN 200420076637U CN 2766265 Y CN2766265 Y CN 2766265Y
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Abstract
The utility model relates to a raman optical fiber amplifier capable of protecting the end surface of an optical fiber. The utility model is provided with a pumping laser, a wave combining device, a connecting optical fiber and an optical fiber splice. The utility model is characterized in that an optical path between the pump laser and the wave combining device is connected with a detecting and controlling device for pumping output light and back light at the end face of the optical fiber splice in series; the detecting and controlling device comprises a light path splitter, an output power detector which is connected with the output from end of the light path splitter, a reflecting power detector which is connected with the reflecting end, and a controlling unit, wherein one end of the controlling unit is connected with the parallel ends of the output power detector and an input power detector; the other end of the controlling unit is connected with the controlling end of the pumping laser. The utility model uses that the end surface of the optical fiber with different clean-up degree has different reflectivity for output light to judge the quality of the end surface of the optical fiber; meanwhile, the controlling unit of the amplifier causes a laser to be in a low-power operating mode or a normal operating mode according to obtained the reflectivity data of the end surface of the optical fiber, effectively protecting the end surface of the optical fiber of the output optical fiber of the amplifier and the end surface of the optical fiber connected with the output optical fiber from being burned.
Description
Technical field
The present invention relates to the optical communication Raman fiber amplifier, relate to the light channel structure design of Raman fiber amplifier and the software control of amplifier specifically.
Background technology
If a weak signal and a heavy pumping light wave transmit in optical fiber simultaneously, and the weak signal wavelength is placed in the Raman gain bandwidth of pump light, weak signal light can obtain amplifying, and this image intensifer based on stimulated Raman scattering mechanism promptly is called Raman fiber amplifier.For the distributed Raman fiber amplifier, will obtain 10dB gain in common G.652 optical fiber, need the above pump power of 550mW, so high pump power is in being input to Transmission Fibers the time, if fiber end face is unclean, in engineering construction, be easy to just fiber end face be burnt.Though the engineering construction personnel have also cleaned fiber end face in the course of the work, in the cleaning of fiber end face many times is not very clean; Perhaps fiber end face was clean originally, but incorrect cleaning mode makes fiber end face dirty; Sometimes fiber end face is clean, but when two connectors are connect, again fiber end face has been made dirty, particularly last a kind of situation, even optical fiber end face detector is arranged, can not guarantee that two fiber end faces that couple together at last clean, if the fiber end face of two connections has slight pollutant, under high power shines for a long time, fiber end face also can be burnt, all these all can just bring very big difficulty to construction, thereby have influenced Raman fiber amplifier greatly in application in engineering.
Summary of the invention
Purpose of the present invention is exactly to overcome the problem and shortage that prior art exists, and a kind of Raman fiber amplifier that can protect fiber end face is provided.Specifically; be exactly that we add pumping output light and return photodetection and control device in light path; judge the reflectivity situation of fiber end face according to the size of reflectivity; the control module of amplifier sends corresponding order according to the decision threshold of fiber end face reflectivity in the Control Software simultaneously; if the reflectivity of the fiber end face that detector detects departs from the certain scope of threshold value; control module will make pump laser automatically shut down or work under low-level power, thereby the protection fiber end face is not burnt.
The present invention is achieved in that the Raman fiber amplifier that can protect fiber end face, it has pump laser, wave multiplexer, connection optical fiber and fibre-optical splice, it is characterized in that among the light path between pump laser and the wave multiplexer, be connected in series a pumping output light and return photodetection of optical-fiber-connector end and control device; This detection and control device comprise a light path splitter, with the output power detector that the output of light path splitter is connected from end, the reflective power detector that is connected with reflection end, and control module; This control module one end is connected with output, power input detector parallel connected end, and the other end is connected with pump laser.
Aforesaid Raman fiber amplifier is characterized in that it also has a winding mold rod that is wrapped on the Transmission Fibers.
Aforesaid Raman fiber amplifier, the diameter that it is characterized in that the winding mold rod is 0.5-1cm, the number of turns that Transmission Fibers is twined is 5～6 circles.
For fiber connector, no matter be that it is placed on separately in the air or with other fiber connector and links to each other by connector, always some light returns along end face, and the clean-up performance difference of end face (passing the light zone), the size of back light are also just different.In light path, we place pumping output light and return photodetection of joint end face and control device, and it is exactly the reflectivity of this end that detected Output optical power (dBm) deducts detected catoptrical power (dBm).Fiber end face is cleaning more, and reflectivity is just big more, if fiber end face (passing the light zone) is unclean, the reflectivity that control module obtains will be less than normal value; If the connector of the output optical fibre of raman pumping module or the connector that is attached thereto have breakage, the reflectivity that control module obtains also can be less than normal value; In a word,, will send alarm command, make pump laser automatically shut down or under low-level power, work, thereby the end face that has guaranteed the amplifier output optical fibre is not damaged if the reflectivity that control module obtains is undesired.
Add the winding mold rod, can guarantee that the fiber end face that links to each other with the end face of amplifier output optical fibre is not damaged.The present invention has the following advantages and good effect:
1) present, the reason that the distributed Raman fiber amplifier is not fully used is exactly because its pumping output power is bigger, the damage of the fiber end face that in work progress, often causes its fiber end face and be attached thereto, bring great inconvenience for construction and maintenance, the present invention can conveniently solve this difficulty, thereby can promote the distributed Raman fiber amplifier energetically in actual application in engineering.
2) light channel structure is simple, is easy to realize, when enhancing product performance, can effectively reduce maintenance cost.
Description of drawings:
Fig. 1 is embodiments of the invention 1 structural representation.Wherein, 1 pump laser group, 2 light path splitters, 2.1 input ends, the main end of 2.2 outputs, 2.3 reflection ends, 2.4 outputs are from end, 3 reflective power detectors, 4 output power detectors, 5 wave multiplexers, 6 connectors, 9 control modules, A sensing point.
Fig. 2 is embodiments of the invention 2 structural representations.Wherein, 12 winding mold rods.
Fig. 3 is the application light channel structure figure of Raman fiber amplifier of the present invention in Transmission Fibers.Wherein, 7 connectors, 8 Transmission Fibers.
Fig. 4 is the fiber end face structural drawing.Wherein, 10 fibre cores, 11 coverings.
Fig. 5 is the pump laser working state schematic representation.Wherein, 1.1 low-level power duties, 1.2 high-level power duties.
Embodiment
Embodiments of the invention 1 as shown in Figure 1.It has pump laser 1, wave multiplexer 5, connects optical fiber and fibre-optical splice 6, among the light path between pump laser 1 and the wave multiplexer 5, is connected in series a pumping output light and return photodetection of fibre-optical splice 6 end faces and control device; This detection and control device comprise one 2 * 2 14xxnm light path splitter 2, export from holding the 2.4 output power detectors 4 that are connected, reflective power detector 3 that is connected with reflection end 2.3 and control module 9 with light path splitter 2; Control module 9 one ends are connected with power input detector 3 parallel connected end with output power detector 4, and the other end is connected with pump laser 1.The scaling point of the output power that the A point among the figure is the reflective power surveyed of detector 3, detector 4 is surveyed.
By power meter, the luminous power that detector 4 is detected is shown as the power that A is ordered, and is designated as P1, the dBm of unit; Common sphere or plane connector, aerial reflectivity is 14.7dB, the power that detector 3 is detected is shown as the luminous power that A point place returns, be designated as P2=P1-14.7, the dBm of unit when the reflection calibration, is closing under the pumping situation, the light source that can utilize 14xxnm is by the input of A point, and the power that detector 3 is detected is shown as the luminous power size of this 14xxnm.The aerial reflectivity of this end face is P2-P1, the dB of unit.
If connector 6 cleans among Fig. 1, the power that detects according to detector 3 and detector 4 is determined the reflectivity of connector 6, is designated as R
0, the dB of unit, and with this as the whether normal standard of this point reflection rate.If fiber end face A is unclean or breakage arranged; the reflectivity that amplifier control unit 9 obtains will be greater than normal value; if fiber end face A cleaning; in order to protect operating personnel's safety; control module 9 will make the 1 time-delay several seconds of pump laser be in normal mode of operation again, can guarantee that by the method the end face A of amplifier output optical fibre is not burnt.
Embodiments of the invention 2 as shown in Figure 2.When Raman fiber amplifier of the present invention is connected with Transmission Fibers 8, need the end face of the fiber connector 7 of probe transmission optical fiber 8 whether to clean or breakage is arranged, perhaps whether clean therebetween after connector 6,7 butt joint or breakage arranged, undertaken by the scheme of embodiments of the invention 2 so, promptly outside the structure of embodiment 1, add winding mold rod 12.
1) as Fig. 2, by power meter, the luminous power that detector 4 is detected is shown as the power that A is ordered, and is designated as P1, the dBm of unit; Common sphere or plane connector, aerial reflectivity is 14.7dB, the power that detector 3 is detected is shown as the luminous power that A point place returns, be designated as P2=P1-14.7, the dBm of unit when the reflection calibration, is closing under the pumping situation, the light source that can utilize 14xxm is by the input of A point, and the power that detector 3 is detected is shown as the luminous power size of this 14xxnm.The aerial reflectivity of this end face is P2-P1, the dB of unit.
2) in Fig. 2, the power that detector 3 and detector 4 are detected connects light path according to Fig. 2 after reserving and being marked with.At connector 6 and connector 7 places, because the Rayleigh scattering luminous power of returning in the Transmission Fibers 8 is than high two orders of magnitude of end face reflection luminous power, when fiber end face has the light contamination thing, at this moment the return loss of end will increase several dB, but owing to proportion shared in the reflected optical power that detects is too little, therefore the reflected optical power that detects will change very little, this can influence the judgement to the end face reflectivity, therefore in detection process in order to eliminate in the Transmission Fibers Rayleigh scattering to the influence of connector 6 with connector 7 places return loss, carry out winding mold to optical fiber at the one segment distance place, back of connector 7 handles, optical fiber will be wrapped on the winding mold rod during winding mold, the diameter of winding mold rod is 1cm, the number of turns of twining just can greater than 3, but be advisable (as shown in Figure 2) with 5～6 circles, for the consideration of secure context, pump laser is initial works under lower power levels simultaneously.If connector 6, connector 7 all clean among Fig. 2, the power that detects according to detector 3 and detector 4 is determined the reflectivity at connector 6 and connector 7 places, is designated as R
0, the dB of unit, and with this as the whether normal standard of this point reflection rate.If fiber end face is unclean or breakage arranged; the reflectivity that amplifier control unit obtains will be greater than normal value; if fiber end face cleaning; in order to protect operating personnel's safety; control module will make the pump laser time-delay several seconds be in normal mode of operation again, can guarantee the end face of amplifier output optical fibre and the fiber end face that is attached thereto is not burnt by the method.
3) Raman fiber amplifier user mode of the present invention as shown in Figure 3.Connector 6 and connector 7 removes winding mold rod 12 after normally docking, and Raman fiber amplifier of the present invention enters user mode.
Claims (3)
1, can protect the Raman fiber amplifier of fiber end face, it has pump laser, wave multiplexer, connection optical fiber and fibre-optical splice, it is characterized in that among the light path between pump laser and the wave multiplexer, be connected in series a pumping output light and return photodetection of optical-fiber-connector end and control device; This detection and control device comprise a light path splitter, with the output power detector that the output of light path splitter is connected from end, the reflective power detector that is connected with reflection end, and control module; This control module one end is connected with output, power input detector parallel connected end, and the other end is connected with pump laser.
2, Raman fiber amplifier as claimed in claim 1 is characterized in that it also has a winding mold rod that is wrapped on the Transmission Fibers.
3, Raman fiber amplifier as claimed in claim 1 or 2, the diameter that it is characterized in that the winding mold rod is 0.5-1cm, the number of turns that Transmission Fibers is twined is 5～6 circles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200766370U CN2766265Y (en) | 2004-09-17 | 2004-09-17 | Raman fibre amplifier capable of protecting optical fibre end face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2004200766370U CN2766265Y (en) | 2004-09-17 | 2004-09-17 | Raman fibre amplifier capable of protecting optical fibre end face |
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| Publication Number | Publication Date |
|---|---|
| CN2766265Y true CN2766265Y (en) | 2006-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2004200766370U Expired - Fee Related CN2766265Y (en) | 2004-09-17 | 2004-09-17 | Raman fibre amplifier capable of protecting optical fibre end face |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585966C (en) * | 2008-06-04 | 2010-01-27 | 中国科学院上海光学精密机械研究所 | Laser device of optical fiber with automatic protection of semiconductor pumping sources |
-
2004
- 2004-09-17 CN CNU2004200766370U patent/CN2766265Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585966C (en) * | 2008-06-04 | 2010-01-27 | 中国科学院上海光学精密机械研究所 | Laser device of optical fiber with automatic protection of semiconductor pumping sources |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: WUHAN GUANGXUN TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: WUHAN GUANGXUN SCIENCE AND TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: YouKeYuan road in Hubei Province, Wuhan city Hongshan District No. 88 Accelink Polytron Technologies Inc Patentee after: Guangxun Science-Technology Co., Ltd., Wuhan Address before: YouKeYuan road in Hubei Province, Wuhan city Hongshan District No. 88 Guangxuan Science & Technology Co Ltd Patentee before: Wuhan Guangxun Science and Technology Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060322 Termination date: 20130917 |