CN2482113Y - Multi-mode erbium-doped optical fibre amplifier - Google Patents
Multi-mode erbium-doped optical fibre amplifier Download PDFInfo
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- CN2482113Y CN2482113Y CN 01244678 CN01244678U CN2482113Y CN 2482113 Y CN2482113 Y CN 2482113Y CN 01244678 CN01244678 CN 01244678 CN 01244678 U CN01244678 U CN 01244678U CN 2482113 Y CN2482113 Y CN 2482113Y
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Abstract
The utility model discloses a multi-mode erbium doped fiber amplifier, which comprises multi-mode fiber connectors, a wavelength selective coupler, a T-shaped splitting coupler, an optical filter, a pump source, multi-mode erbium doped fiber, etc. The utility model is characterized in that an optical carrier wave signal is transmitted into a multi-mode wavelength selective coupler with the multi-mode fiber through the multi-mode fiber connector, and coupled with the multi-mode tail fiber of a pump laser, then filled in the multi-mode erbium doped fiber and amplified, then transmitted into the T-shaped splitting coupler and the optical filter, etc. to be processed, and then the optical carrier wave signal is outward outputted through another multi-mode fiber connector. The utility model has the advantages that the gain is high, the noise is low, the saturated output power is large, the production rate of finished products is high, the process is simple, the cost is low, the application is wide, and thus widely being used for amplifying the optical carrier wave signal in the laser space communication field and the optical fiber communication field.
Description
The utility model relates to the fiber optic applications technology of a kind of optics and space optical communication technical field, refers to use the amplifier that Er-doped fiber is made especially.
At present, space optical communication is compared with microwave communication because it has the directivity of height and does not need frequency license, significant advantages such as information capacity is very big, is difficult for eavesdropping, and construction and installation are extremely convenient, be subjected to the extensive attention of information industry circle in recent years, as companies such as BT, Lucent.
Lucent company adopts mature single mode Erbium-Doped Fiber Amplifier (EDFA) EDFA and wavelength-division multiplex technique (WDM) in the single-mode fiber high speed transmission system, realizes that successfully 4 * 2.5G/S, transmission range surpass the light wireless communication system of 4KM.But, be applicable to that the online Erbium-Doped Fiber Amplifier (EDFA) EDFA of single mode must work under the situation of minimum core diameter of optical fiber and low numerical aperture, so that mould field coupling, the junction loss of minimizing single-mode fiber.And its pumping is restricted by the fibre core nonlinear effect owing to power, and makes the amplifier performance limiting factor many, and particularly the pump laser coupling efficiency is low, and price is expensive high.This just makes that the light wireless communication equipment that adopts traditional Erbium-Doped Fiber Amplifier (EDFA) EDFA to constitute is difficult to be admitted by market.
The purpose of this utility model is to seek the solution that its gordian technique is an Erbium-Doped Fiber Amplifier (EDFA) for laser space communication.There is not this essential characteristic of effect of dispersion in transmission to the utility model based on spatial light, propose that to be restricted to single mode different with traditional single mode Erbium-Doped Fiber Amplifier (EDFA) EDFA mode of operation, promptly work in multimode, have not only that technology is simple, yield rate is high, price compares outstanding advantage such as decline to a great extent, and improved the Multi-mode Erbium Doped Fiber Amplifier (hereinafter to be referred as MEDFA) of the performance of amplifier greatly with traditional single mode Erbium-Doped Fiber Amplifier (EDFA).
The purpose of this utility model realizes by following technical solution:
Multi-mode Erbium Doped Fiber Amplifier described in the utility model is made up of multimode optical fiber connector, multimode wavelength selective coupler, multimode optical fiber T type shunting coupler, light filter, pumping source, multimode Er-doped fiber etc., be characterized in the signal input part input of optical carrier by the first multimode optical fiber unitor, the signal output part of this multimode optical fiber unitor inserts a multimode optical fiber, and inserts a signal input part of multimode wavelength selective coupler by this multimode optical fiber; The laser that the multimode pigtail output laser of pumping source produces also is connected to another signal input part of multimode wavelength selective coupler after first multimode optical fiber T type shunting coupler coupling output; The signal output part of multimode wavelength selective coupler is connected to the signal input part of the second multimode optical fiber T type shunting coupler by the multimode Er-doped fiber; The signal output part and a multimode optical fiber of this multimode optical fiber T type shunting coupler join, and inserting the signal input part of a light filter by this multimode optical fiber, the signal output part of this light filter joins by the signal input part of the another multimode optical fiber and the second multimode optical fiber unitor; Signal after the amplification is outwards exported the flashlight of 1550nm by this second multimode optical fiber unitor.
Another characteristics of the present utility model are: the aforesaid second multimode optical fiber T type shunting coupler also has a feedback control signal output terminal, this output terminal joins with second light filter and photo-detector successively by multimode optical fiber, feedback control signal is transported to gain control module, with the power supply of control pumping source, thus control signal power.
Another characteristics of the present utility model are: the signal output part of the aforesaid first multimode optical fiber unitor also joins by the signal input part of a multimode optical fiber and an optoisolator, and the signal output part of optoisolator joins by a signal input part of a multimode optical fiber and multimode wavelength selective coupler; Be connected with an optoisolator by multimode optical fiber between the signal input part of the signal output part of aforesaid light filter and the second multimode optical fiber unitor.
Also another characteristics of the present utility model are: aforesaid multimode optical fiber, its core diameter of multimode Er-doped fiber are preferably 50 μ or 62.5 μ or 100 μ, and the section index distribution can be gradient type or step change type.
Characteristics more of the present utility model are: the pump laser of aforesaid pumping source is a semiconductor laser, and the preferred 820nm of its wavelength, 980nm, 1480nm, tail optical fiber are multimode optical fiber, and its section index distribution is close with the multimode Er-doped fiber.
The utility model has the advantages that:
1, owing to adopts the multimode Er-doped fiber, from theoretical analysis as can be known, MEDFA will work in the multimode situation, but, thereby can not consider the influence (though modulus is directly proportional with numerical aperture and core diameter) of its chromatic dispersion owing to its geometrical length (being generally in several meters) is compared and can be ignored with its laser spatial information transmission range.Thereby, adopt the utility model can realize that the space light transmitting and receiving device that is made of MEDFA carries out transparent the connection with existing high speed optical fiber communication terminal device (comprising DWDM), constitute the space optical communication system that has dirigibility.
2, under the multimode situation, theory and practice can prove that under the complete even incentive condition of mould, the mould field distribution is the section index distribution, and the complete even excitation of mould can mould is approximate to be realized by disturbing.Because the signal optical mode field and the pumping optical mode field of er-doped Active Optical Fiber are approximately the section index distribution, and be close with pumping multimode pigtail section index distribution as the multimode Er-doped fiber, can be considered both and overlap each other.Again because big two orders of magnitude of the comparable single-mode fiber of its fibre core area (core diameter has increased an order of magnitude), thereby improved the interaction area greatly.Simultaneously, the pump power that is coupled into Active Optical Fiber with multimode pigtail also will improve two orders of magnitude, thereby can realize that under identical doping content situation the probability of particle counter-rotating will improve two more than the order of magnitude.This just makes MEDFA will obtain the performance that is unsurpassed in excellence than single mode erbium-based amplifier EDFA, as: high small-signal gain, the spontaneous radiation noise of extremely low amplification and high saturation output power etc.
3, the multimode Active Optical Fiber after-combustion structure of carrying out as usual will effectively reduce the influence of revealing mould, and near the complete even incentive condition of mould, thereby not influence the stable working state of MEDFA.Under the multimode operation situation, the connection accuracy requirement between each parts also can reduce.
4, because multimode Er-doped fiber MEDF core diameter has increased an order of magnitude than the core diameter of single mode EDF, adopts general MCVD technology just can prepare, the difficulty of its technology controlling and process and precision are significantly less than and prepare the single mode Er-doped fiber.Because multimode Er-doped fiber junction loss is little, the physical dimension tolerance is big, thereby the yield rate height, thereby cost will be very cheap.
5, pumping source of the present utility model adopts semiconductor pump laser, and tail optical fiber changes multimode optical fiber into by single-mode fiber.Adopt quantum well technology to prepare pump laser, technology is very ripe, can obtain long-life, low threshold value, high power output, and single transverse mode that needn't freeze and the output of many longitudinal modes.It is low to overcome single-mode fiber tail optical fiber coupling efficiency, complex process, and the shortcoming that yield rate is low improves the tail optical fiber coupling efficiency greatly, simplifies manufacture craft, improves yield rate, reduces the pump laser price of magnetic tape trailer fibre greatly.Simultaneously, because pump power can further improve (only being subjected to the non-line effect limits of fibre core), the width of cloth of being excited that helps light is penetrated and is excited to absorb, and reduces and amplifies spontaneous radiation noise, improves small-signal gain and saturation output power, thereby can significantly promote the performance of MEDFA.In addition, in EDFA,, in MEDFA, then can because pump power limited often adopts the two directional pump mode.
6, in the high speed single mode fiber system, owing to have the backscattering of optical fiber, so optoisolator (ISO) is essential among the EDFA.But in the spatial light transmission system, owing to do not have backscattering, so can save expensive ISO among the MEDFA.
7, adopt the utility model can widen the application of space optical communication greatly, fundamentally change the current looks that are confined to short-range dedicated system (middle low rate).For example, can realize being connected, thereby can significantly reduce the cost of space optical communication equipment, improve its dirigibility, be convenient to system upgrade with the transparent of existing fiber communication facilities.In addition, its excellent small-signal gain and high saturated output also will significantly improve the reliability of system.With MEDFA is that the basis can constitute many relayings spatial light high Capacity Communication System, also will have competitive power to the high capacity communication of moderate distance scope.In addition, MEDFA also has a good application prospect in fields such as light satellite communication, spatial light information processings.
Below in conjunction with an embodiment and accompanying drawing thereof the technical solution of the utility model is described further:
Fig. 1 is the structure principle chart of the utility model one embodiment.
In Fig. 1, all given components and parts are existing components and parts.Wherein, 1 is the first multimode optical fiber connector, 2 is first optoisolators, the 3rd, and multimode wavelength selective coupler, the 4th, multimode Er-doped fiber, 5 is second multimode optical fiber T type shunting couplers, 6 is first light filters, and 7 is second optoisolators, and 8 is second multimode optical fiber connectors, the 11st, gain control module, the 17th, pumping source.Optical carrier enters multimode optical fiber unitor 1 by the signal input part of the first multimode optical fiber unitor 1; Its signal output part inserts the signal input part of first optoisolator 2 by multimode optical fiber, and the signal output part of this optoisolator 2 joins by a signal input part of multimode optical fiber and multimode wavelength selective coupler 3; The laser that the multimode pigtail output laser of pumping source 17 produces also is connected to another signal input part of multimode wavelength selective coupler 3 after the 16 coupling outputs of the first multimode optical fiber T type shunting coupler; The signal output part of this multimode wavelength selective coupler 3 is connected to the signal input part of the second multimode optical fiber T type shunting coupler 5 by multimode Er-doped fiber 4; The signal output part of this multimode optical fiber T type shunting coupler 5 inserts first light filter 6 by multimode optical fiber, its feedback control signal output terminal joins with second light filter 9 and photo-detector 10 successively by multimode optical fiber, and feedback control signal is transported to gain control module 11; The signal output part of first light filter 6 joins by the signal input part of multimode optical fiber and second optoisolator 7 and the second multimode optical fiber unitor 8; Signal after the amplification is by this outwards output output of multimode optical fiber unitor 8.For guaranteeing technique effect, multimode optical fiber and multimode Er-doped fiber 4 core diameters are preferably 50 μ or 62.5 μ or 100 μ, and the section index distribution can be gradient type or step change type; The multimode pigtail output laser of pumping source 17 is a semiconductor laser, and the preferred 820nm of its wavelength, 980nm, 1480nm, tail optical fiber are multimode optical fiber, and its section index distribution is close with the multimode Er-doped fiber.
Principle of work of the present utility model is under the multimode situation, because the signal optical mode field and the pumping optical mode field of er-doped Active Optical Fiber are approximately the section index distribution, can be considered both and overlap each other.Again because big two orders of magnitude of the comparable single-mode fiber of its fibre core area (core diameter has increased an order of magnitude, promptly is increased to tens μ by original several μ, even μ up to a hundred), thereby improved the interaction area greatly.Simultaneously, the pump power that is coupled into Active Optical Fiber with multimode pigtail also will improve two orders of magnitude, thereby can realize that under identical doping content situation the probability of particle counter-rotating will improve two more than the order of magnitude.Thereby realize amplification, make MEDFA obtain the performance that is unsurpassed in excellence than single mode erbium-based amplifier EDFA light signal.As small-signal being had high gain, make and amplify spontaneous radiation noise and reduce greatly, saturation output power improves etc. greatly.
In order to realize controllable adjustment of the present utility model, signal power controller 12 in the gain control module 11 will be 10 detected according to photo-detector, from the feedback signal of the second multimode optical fiber T type shunting coupler 5, power supply 15 by control bus control pumping source 17, control its output power, thereby realize control this amplifier signal power.Pump power controller 13 in the gain control module 11 detects the feedback signal of the first multimode optical fiber T type shunting coupler, 16 outputs by photo-detector 18, power supply 15 by control bus control pumping source 17, control its output power, realize control pump power.Temperature controller 14 in the gain control module 11 detects by the temperature to pumping source 17, realizes the temperature control to pumping source.
Claims (8)
1, Multi-mode Erbium Doped Fiber Amplifier, form by multimode optical fiber connector (1), (8), multimode wavelength selective coupler (3), multimode optical fiber T type shunting coupler (5), (16), light filter (6), pumping source (17), multimode Er-doped fiber (4) etc., it is characterized in that optical carrier enters multimode optical fiber unitor (1) by the signal input part of the first multimode optical fiber unitor (1); The signal output part of this multimode optical fiber unitor (1) inserts a multimode optical fiber and inserts a signal input part of multimode wavelength selective coupler (3) by this multimode optical fiber; The laser that the multimode pigtail output laser of pumping source (17) produces also is connected to another signal input part of multimode wavelength selective coupler (3) after the first multimode optical fiber T type shunting coupler (16) coupling output; The signal output part of multimode wavelength selective coupler (3) inserts a multimode Er-doped fiber (4), and is connected to the signal input part of the second multimode optical fiber T type shunting coupler (5) by this multimode Er-doped fiber (4); The signal output part of this multimode optical fiber T type shunting coupler (5) and a multimode optical fiber join and insert light filter (6) by this multimode optical fiber, and the signal output part of light filter (6) joins by the signal input part of the multimode optical fiber and the second multimode optical fiber unitor (8); Signal after the amplification is by the outwards output of this multimode optical fiber unitor (8).
2, Multi-mode Erbium Doped Fiber Amplifier according to claim 1, the signal output part that it is characterized in that the described second multimode optical fiber T type shunting coupler (5) also has a feedback control signal output terminal, this output terminal joins with second light filter (9) and photo-detector (10) successively by multimode optical fiber, feedback control signal is transported to gain control module (11), with the power supply of control pumping source (17), thus control signal power.
3, Multi-mode Erbium Doped Fiber Amplifier according to claim 1, the signal output part that it is characterized in that the described first multimode optical fiber unitor (1) also joins by the signal input part of a multimode optical fiber and an optoisolator (2), and the signal output part of optoisolator (2) joins by a signal input part of a multimode optical fiber and multimode wavelength selective coupler (3); Be connected with an optoisolator (7) by multimode optical fiber between the signal input part of the signal output part of described light filter (6) and the second multimode optical fiber unitor (8).
4, Multi-mode Erbium Doped Fiber Amplifier according to claim 1 and 2 is characterized in that described multimode optical fiber, its core diameter of multimode Er-doped fiber (4) are preferably 50 μ or 62.5 or 100 μ, and the section index distribution can be gradient type or step change type.
5, Multi-mode Erbium Doped Fiber Amplifier according to claim 3 is characterized in that described multimode optical fiber, its core diameter of multimode Er-doped fiber (4) are preferably 50 μ or 62.5 μ or 100 μ, and the section index distribution can be gradient type or step change type.
6, Multi-mode Erbium Doped Fiber Amplifier according to claim 1 and 2, the laser instrument that it is characterized in that described pumping source (17) is a semiconductor laser, the preferred 820nm of its wavelength, 980nm, 1480nm, tail optical fiber are multimode optical fiber, and its section index distribution is close with the multimode Er-doped fiber.
7, Multi-mode Erbium Doped Fiber Amplifier according to claim 3, the laser instrument that it is characterized in that described pumping source (17) is a semiconductor laser, the preferred 820nm of its wavelength, 980nm, 1480nm, tail optical fiber are multimode optical fiber, and its section index distribution is close with the multimode Er-doped fiber.
8, Multi-mode Erbium Doped Fiber Amplifier according to claim 4, the laser instrument that it is characterized in that described pumping source (17) is a semiconductor laser, the preferred 820nm of its wavelength, 980nm, 1480nm, tail optical fiber are multimode optical fiber, and its section index distribution is close with the multimode Er-doped fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01244678 CN2482113Y (en) | 2001-07-06 | 2001-07-06 | Multi-mode erbium-doped optical fibre amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01244678 CN2482113Y (en) | 2001-07-06 | 2001-07-06 | Multi-mode erbium-doped optical fibre amplifier |
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| CN2482113Y true CN2482113Y (en) | 2002-03-13 |
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| CN 01244678 Expired - Fee Related CN2482113Y (en) | 2001-07-06 | 2001-07-06 | Multi-mode erbium-doped optical fibre amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI402548B (en) * | 2008-08-25 | 2013-07-21 | Univ Nat Sun Yat Sen | Fiber system having multi mode fiber amplifier and single mode fiber and the wide band coupling method thereof |
| CN107884093A (en) * | 2016-09-30 | 2018-04-06 | 天津市誉航润铭科技发展有限公司 | A kind of fibre optical sensor relays amplification module |
| CN107884092A (en) * | 2016-09-30 | 2018-04-06 | 天津市誉航润铭科技发展有限公司 | A kind of distributed fiberoptic sensor relays amplification module |
-
2001
- 2001-07-06 CN CN 01244678 patent/CN2482113Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI402548B (en) * | 2008-08-25 | 2013-07-21 | Univ Nat Sun Yat Sen | Fiber system having multi mode fiber amplifier and single mode fiber and the wide band coupling method thereof |
| CN107884093A (en) * | 2016-09-30 | 2018-04-06 | 天津市誉航润铭科技发展有限公司 | A kind of fibre optical sensor relays amplification module |
| CN107884092A (en) * | 2016-09-30 | 2018-04-06 | 天津市誉航润铭科技发展有限公司 | A kind of distributed fiberoptic sensor relays amplification module |
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| CF01 | Termination of patent right due to non-payment of annual fee |