CN2901349Y - Optical fiber polarized super-fluorescent light source - Google Patents
Optical fiber polarized super-fluorescent light source Download PDFInfo
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- CN2901349Y CN2901349Y CN 200620042597 CN200620042597U CN2901349Y CN 2901349 Y CN2901349 Y CN 2901349Y CN 200620042597 CN200620042597 CN 200620042597 CN 200620042597 U CN200620042597 U CN 200620042597U CN 2901349 Y CN2901349 Y CN 2901349Y
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 23
- 230000010287 polarization Effects 0.000 claims abstract description 55
- 230000003287 optical effect Effects 0.000 claims abstract description 47
- 239000000835 fiber Substances 0.000 claims abstract description 36
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 abstract description 5
- 230000009466 transformation Effects 0.000 description 5
- 230000002269 spontaneous effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000011514 reflex Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
A fiber polarized superfluorescent light source comprising: a first broadband reflector, a first doped optical fiber, a first dichroic filter, an optical isolator, a first polarization beam splitter, a Faraday rotator, a second polarization beam splitter, a second dichroic filter, a second doped optical fiber, an 1/4 wave plate and a second broadband reflector are sequentially arranged on the same optical axis, the included angle between the first dichroic filter and the optical axis and the included angle between the second dichroic filter and the optical axis are 45 degrees, a first pumping light source is arranged at the intersection point of the first dichroic filter and the optical axis and is vertical to the direction of the optical axis, a second pumping light source is arranged at the intersection point of the second dichroic filter and the optical axis and is vertical to the direction of the optical axis, a third broadband reflector is arranged at the intersection point of the second polarization beam splitter and the optical axis and is vertical to the direction of the optical axis, the direction of the intersection point of the first polarization beam splitter and the optical axis and perpendicular to the optical axis is the output direction of the polarized fluorescence.
Description
Technical field
The utility model belongs to optical fiber source,, particularly a kind of optical fiber polarized super fluorescent light source.
Background technology
Superfluorescence is a kind of transition state between laser and fluorescence, is amplified spont-aneous emission (amplified spontaneous emission).Doped fiber super-fluorescence light source (superfluorescent fiber source) is owing to have the superior performances such as high stability of wide bandwidth, output power height and mean wavelength, obtained using widely in a lot of fields such as optical fibre gyro, Fibre Optical Sensor, spectrum test, commercial at present wideband light source mostly is superluminescent diode (being designated hereinafter simply as SLD), but the life-span of SLD is short, wavelength stability is poor, output power is low, also be restricted with the coupling of single-mode fiber, so the doped fiber super-fluorescence light source has very big potentiality as the substitute products of SLD.
In order to obtain the superfluorescence of different-waveband, can select different doped fibers for use: as mix Er
3+, Nd
3+, Yb
3+Optical fiber or the like.The erbium-doped super-fluorescent light source can obtain the superfluorescence of C-band (1520nm-1560nm), even can obtain the superfluorescence of C+L wide bandwidth 80nm by certain methods.
Usually, the basic structure of optical fiber super-fluorescence light source can be divided into: one way forward direction (SPF), after the one way to (SPB), round trip forward direction (DPF), after the round trip to (DPB) super-fluorescence light source.The one way structure has only been utilized the amplified spont-aneous emission of a direction, and the round trip structure adds catoptron by export a reciprocal end at superfluorescence, has utilized the superfluorescence of both direction.If superfluorescent output is consistent with the pumping direction of pump light, be referred to as the forward direction superfluorescence, the superfluorescence opposite with pump direction then is called reverse superfluorescence.The major advantage of the super-fluorescence light source of one way structure is to be not easy to cause laser generation, the shortcoming of one way forward direction is that the output energy is too little, this is because more weak at the output terminal pump light of optical fiber, when particularly optical fiber is longer, the pump light of fiber-optic output has almost run out, so generally do not adopt this structure.Output power with respect to one way forward direction structure to structure after the one way is bigger.Compare with one way, the transformation efficiency of round trip super-fluorescence light source obviously improves, and can obtain bigger output power, and better mean wavelength stability is provided, but causes laser generation easily.In general, need add the instability that optoisolator is eliminated the light source that feedback signal causes at the output terminal of super-fluorescence light source.
Fig. 1 is to the synoptic diagram of erbium-doped super-fluorescent light source after the round trip.Pump light source 01 wavelength is 980 nanometers, and two wavelength division multiplexers (WDM) 03,05 are used for separating pump light and superfluorescence, and fiber reflector 06 has the reflectivity more than 90% in the necessary wavelength scope.Again be coupled to after superfluorescence reflects through fiber reflector 06 and realize in the Er-doped fiber 4 exporting to superfluorescence after the round trip, in order to reduce the light feedback, add an isolator 2 (L.A.Wang and C.D.Chen.Stable and broadbandEr-doped superfluorescent fibre sources using double-pass backwardconfiguration.Electronics Letters.1996.Vol.32:1815-1817) at output terminal.Document (Sheng-Ping Chen, Yi-Gang Li, Jian-Piing Zhu, elt.Watt-level L bandsuperfluorescent fiber source.Optics Express 2005.vol.13:153-11536) amplifies the next output power that further improves super-fluorescence light source by a Double Pass Amplifier to superfluorescence.Superfluorescence power in input is 2.8 milliwatts, and the pumping light power of 976 nanometers is 4.4 watt-hours, can obtain the super-fluorescence light source of 0.94 watt L-band.But the superfluorescence that obtains is not a polarization.
In fact, in the application in some field, need single polarized super fluorescent.Because the output of common super-fluorescence light source all is nonpolarized light, like this, has 50% energy loss by a polaroid and fall.So the polarized super fluorescent light source of development high-output power has important practical significance.
The utility model content
The purpose of this utility model provides a kind of optical fiber polarized super fluorescent light source, to obtain the superfluorescence output of high-power polarization.
Technical solution of the present utility model is as follows:
A kind of optical fiber polarized super fluorescent light source, its formation comprises: be provided with first broadband mirrors on same optical axis successively, first doped fiber, first double color plate, optical isolator, first polarization beam apparatus, Faraday polarization apparatus, second polarization beam apparatus, second double color plate, second doped fiber, quarter wave plate, second broadband mirrors, the angle of described first double color plate and second double color plate and described optical axis is 45 °, described first broadband mirrors is relative with the reflecting surface of second broadband mirrors, be provided with first pump light source at the intersection point of described first double color plate and described optical axis and perpendicular to described optical axis direction, be provided with second pump light source at the intersection point of described second double color plate and described optical axis and perpendicular to described optical axis direction, the intersection point of described second polarization beam apparatus and described optical axis also is provided with the 3rd broadband mirrors perpendicular to described optical axis direction, the intersection point of described first polarization beam apparatus and described optical axis and be the outbound course of polarized fluorescence perpendicular to the direction of described optical axis.
Described quarter wave plate (13) is a broadband achromatism quarter wave plate.
The superfluorescence light beam that sends from the first doped fiber rear end is (high saturating to super-fluorescence light source through first double color plate, pump light is high anti-), isolator, first polarization beam apparatus, Faraday polarization apparatus (45 degree), second polarization beam apparatus and second double color plate arrive second doped fiber, and it is exaggerated in optical fiber as seed signal light.After quarter wave plate is by the second broadband reflection mirror reflection, light beam passes through described quarter wave plate (45 degree) again, at this moment its polarization direction is revolved and is turn 90 degrees. reflex to the 3rd broadband mirrors mirror through second polarization beam apparatus then, the polarized light of reflection can be along second polarization beam apparatus, second double color plate, second doped fiber, quarter wave plate, second broadband mirrors, quarter wave plate, second doped fiber, second double color plate, when arriving second polarization beam apparatus, the polarization direction of light beam is identical with the polarization direction of inciding second polarization beam apparatus.After 4 amplifications, light beam is through Faraday polarization apparatus, and its polarization direction rotation 45 degree are after the polarized super fluorescent of first polarization beam apparatus reflection output high-power.Superfluorescence amplifies for 4 times in Yb dosed optical fiber, bigger raising the transformation efficiency of pump light.
Characteristics of the present utility model::
After the round trip to polarized super fluorescent as seed source, allowing it obtain 4 journeys in one section doped fiber amplifies, amplify the transformation efficiency of comparing pump light with original one way or round trip and be greatly improved, thereby can obtain a kind of polarized super fluorescent light source of more increasing than former output power with the optical fiber of same length.The utility model is applicable to the superfluorescence output of the high-power polarization that obtains various doped fibers.
Description of drawings
Fig. 1 is to the synoptic diagram of super-fluorescence light source structure after the existing round trip.
Wherein: 01 for wavelength be the pumping source of 980 nanometers; 02 is faraday isolator; 03,05 is wavelength division multiplexer; 04 is Er-doped fiber; 06 is broadband mirrors
Fig. 2 is the structural representation of the utility model optical fiber polarized super fluorescent light source
Among the figure: 1-first broadband mirrors; 2-first doped fiber; 3-first pump light source; 4-first double color plate; The 5-isolator; 6-first polarization beam apparatus; The 7-Faraday polarization apparatus; 8-second polarization beam apparatus; 9-the 3rd broadband mirrors; 10-second double color plate; 12-second doped fiber; 11-second pump light source; The 13-1/4 wave plate; 14-second broadband mirrors.
Embodiment
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing, but should not limit protection domain of the present utility model with this.
See also Fig. 2 earlier, Fig. 2 is the structural representation of the utility model optical fiber polarized super fluorescent light source, it also is the structural representation of the utility model embodiment, as seen from the figure, the utility model optical fiber polarized super fluorescent light source, formation comprises: be provided with first broadband mirrors 1 on same optical axis successively, first doped fiber 2, first double color plate 4, optical isolator 5, first polarization beam apparatus 6, Faraday polarization apparatus 7, second polarization beam apparatus 8, second double color plate 10, second doped fiber 12, quarter wave plate 13, second broadband mirrors 14, described first double color plate 4 and second double color plate 10 are 45 ° with the angle of described optical axis, described first broadband mirrors 1 is relative with the reflecting surface of second broadband mirrors 14, be provided with first pump light source 3 at described first double color plate 4 with the intersection point of described optical axis and perpendicular to described optical axis direction, be provided with second pump light source 11 at described second double color plate 10 with the intersection point of described optical axis and perpendicular to described optical axis direction, described second polarization beam apparatus 8 is provided with the 3rd broadband mirrors 9 with the intersection point of described optical axis and perpendicular to described optical axis direction, the intersection point of described first polarization beam apparatus 6 and described optical axis and be the outbound course of polarized fluorescence perpendicular to the direction of described optical axis.Described quarter wave plate 13 is a broadband achromatism quarter wave plate.
In concrete enforcement, at first select the suitable pump light source and the length of two sections doped fibers.First double color plate 4 becomes miter angle with second double color plate 10 with the horizontal direction optical axis.First polarization beam apparatus 6 and second polarization beam apparatus 8, the isolation of described isolator 5 are high as far as possible to cause disturbance in order to avoid the superfluorescence that feeds back enters first doped fiber 2, the superfluorescent stability of final influence output.The end face of second doped fiber 12 preferably carries out the angle polishing with the angle of 70-150, with the laser generation of avoiding Fresnel (Fresnel) reflection to cause.
Its course of work is as follows:
The superfluorescence light beam that sends from first doped fiber, 2 rear ends is (high saturating to super-fluorescence light source through first double color plate 4, pump light is high anti-), isolator 5, first polarization beam apparatus 6, Faraday polarization apparatus 7, second polarization beam apparatus 8 and second double color plate 10 arrive second doped fiber 12, it is exaggerated in second doped fiber 12 as seed signal light.After quarter wave plate 13 is by 14 reflections of second broadband mirrors, light beam passes through described quarter wave plate 13 (45 degree) again, at this moment its polarization direction is revolved and is turn 90 degrees. reflex to the 3rd broadband mirrors mirror 9 through second polarization beam apparatus 8 then, the polarized light of reflection can be along 8-10-12-13-14-13-12-10, when arriving second polarization beam apparatus 8, the polarization direction of light beam is identical with the polarization direction of inciding second polarization beam apparatus 8.After 4 amplifications, light beam is through Faraday polarization apparatus 7, and its polarization direction rotation 45 degree are after the polarized super fluorescent of first polarization beam apparatus, 6 reflection output high-powers.Superfluorescence amplifies for 4 times in Yb dosed optical fiber, bigger raising the transformation efficiency of pump light.
Directly inject second doped fiber 12 as signal source by isolator 5, first polarization beam apparatus 6 and Faraday polarization apparatus 5 backs to superfluorescence by the back of first doped fiber generation.The transformation efficiency of the great pump light that improves because having carried out 4 times, amplifies the polarized super fluorescent of 12 pairs of inputs of second doped fiber, so under same condition, can obtain the superfluorescence output of more powerful polarization with the optical fiber of equal length.
Claims (2)
1, a kind of optical fiber polarized super fluorescent light source, be characterised in that its formation comprises: on same optical axis, be provided with first broadband mirrors (1) successively, first doped fiber (2), first double color plate (4), optical isolator (5), first polarization beam apparatus (6), Faraday polarization apparatus (7), second polarization beam apparatus (8), second double color plate (10), second doped fiber (12), quarter wave plate (13), second broadband mirrors (14), described first double color plate (4) and second double color plate (10) are 45 ° with the angle of described optical axis, described first broadband mirrors (1) is relative with the reflecting surface of second broadband mirrors (14), be provided with first pump light source (3) at described first double color plate (4) with the intersection point of described optical axis and perpendicular to described optical axis direction, be provided with second pump light source (11) at described second double color plate (10) with the intersection point of described optical axis and perpendicular to described optical axis direction, the intersection point of described second polarization beam apparatus (8) and described optical axis also is provided with the 3rd broadband mirrors (9) perpendicular to described optical axis direction, the intersection point of described first polarization beam apparatus (6) and described optical axis and be the outbound course of polarized fluorescence perpendicular to the direction of described optical axis.
2, optical fiber polarized super fluorescent light source according to claim 1 is characterized in that described quarter wave plate (13) is a broadband achromatism quarter wave plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620042597 CN2901349Y (en) | 2006-06-09 | 2006-06-09 | Optical fiber polarized super-fluorescent light source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620042597 CN2901349Y (en) | 2006-06-09 | 2006-06-09 | Optical fiber polarized super-fluorescent light source |
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| CN2901349Y true CN2901349Y (en) | 2007-05-16 |
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| CN 200620042597 Expired - Lifetime CN2901349Y (en) | 2006-06-09 | 2006-06-09 | Optical fiber polarized super-fluorescent light source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384036C (en) * | 2006-06-09 | 2008-04-23 | 中国科学院上海光学精密机械研究所 | Optical fiber polarized super-fluorescent light source |
| CN103236629A (en) * | 2013-04-24 | 2013-08-07 | 广东汉唐量子光电科技有限公司 | Polarization-stable optical fiber laser cascade amplifier |
-
2006
- 2006-06-09 CN CN 200620042597 patent/CN2901349Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384036C (en) * | 2006-06-09 | 2008-04-23 | 中国科学院上海光学精密机械研究所 | Optical fiber polarized super-fluorescent light source |
| CN103236629A (en) * | 2013-04-24 | 2013-08-07 | 广东汉唐量子光电科技有限公司 | Polarization-stable optical fiber laser cascade amplifier |
| CN103236629B (en) * | 2013-04-24 | 2016-09-28 | 广东汉唐量子光电科技有限公司 | A kind of optical fiber laser cascade amplifier of polarization-stable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080423 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080423 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |