CN1037735C - Optical fibre amplifier with dual rasters - Google Patents
Optical fibre amplifier with dual rasters Download PDFInfo
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- CN1037735C CN1037735C CN93114035A CN93114035A CN1037735C CN 1037735 C CN1037735 C CN 1037735C CN 93114035 A CN93114035 A CN 93114035A CN 93114035 A CN93114035 A CN 93114035A CN 1037735 C CN1037735 C CN 1037735C
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- optical fiber
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Abstract
The present invention relates to an optical fiber amplifier with double rasters, which belongs to the field of optical fiber communication. The optical fibre amplifier comprises a driving power supply, a semiconductor pumping laser, a wave synthesis type optical fibre wavelength division multiplexing coupler, adulterate optical fibre, a wave-split type optical fibre wavelength division multiplexing coupler and output signal optical fibre which are connected in series in sequence. A communication signal is input into an input port of the wave synthesis type optical fibre wavelength division multiplexing coupler from single mode optical fiber. The present invention has the improvement that a first raster which can inhibit spontaneous radiation is engraved at the intermediate part of the adulterate optical fibre, and a second raster which can reflect the pumping wavelength is engraved at the rear section of the adulterate optical fibre. The present invention has the advantages that the gain spectrum width is improved, the noise of the spontaneous radiation is effectively inhibited, and the utilization efficiency of the pumping light is enhanced.
Description
The present invention relates to optical-fibre communications field, particularly relate to a kind of fiber amplifier of direct amplification communication light signal.
Along with the continuous development of optical fiber communication technology, optical-fibre communications is universal day by day.Fiber to the home has become trend of the times.In long Distance Transmission main line, optical mesh network node and some other occasions of light, often need the optical communication signal in the transmission is compensated, amplifies.Previous technology is after earlier light signal being become the signal of telecommunication and the signal of telecommunication being handled, amplify, to convert light signal again to and transmit distribution.This not only brings many inconvenience, and has influenced the speed of optical communication, has reduced the capacity of optical communication, is difficult to give full play to the advantage of optical-fibre communications.The appearance of fiber amplifier just makes these problems be solved.
Multiple finished product fiber amplifier is arranged in the prior art.But we do not have to find to be carved with the fiber amplifier of double grating on doped fiber.Existing fiber amplifier exists following problem: the Amplifier Gain spectrum is smooth inadequately, and the representative value of the gain spectrum width of 3dB only is 5nm; Though can be suppressed to spontaneous emission noise about 7dB, used technology, complex structure, cost height and index are still not very good; The utilization ratio of pump light is low, and the representative value of the 0.98 μ m pumping light power that does not obtain utilizing is up to 20% etc. of input optical power.
The objective of the invention is to overcome the deficiency of the fiber amplifier of above-mentioned prior art, provide a kind of and utilize double grating to improve the gain spectrum width, suppress spontaneous emission noise and improve the fiber amplifier of pump light utilization ratio.
The fiber amplifier that has double grating of the present invention comprise successively serial connection driving power, semiconductor pump laser, close ripple formula optical fibre wavelength-division multiplex coupler, doped fiber, partial wave formula fiber coupler and output signal optical fiber, this fiber amplifier also comprises the monomode fiber of transmission communication signal, communication signal S on the said monomode fiber is input to an input port of the ripple formula optical fiber wavelength division coupler of mediating, and it is characterized in that: the mid portion at doped fiber is carved with first grating; Back segment at doped fiber is carved with second grating near the position of said output port.
Compare with existing fiber amplifier, the fiber amplifier that has double grating of the present invention has following advantage:
1, utilize grating to improve the Amplifier Gain spectrum width, make it more smooth: the 3dB gain spectrum width of existing amplifier is increased to 5nm; The 3dB gain spectrum width of amplifier of the present invention is increased to more than the 35nm, and as far as we know, this is present highest level in the world.
2, utilize grating to suppress spontaneous emission noise, the spontaneous emission noise at 1528nm place is dropped to below the 5dB from 12dB.
3, utilize grating to improve the utilization ratio of pump light: the amplifier of prior art is 20% of total input optical power by the representative value of the 0.980 μ m pumping light power that does not obtain utilizing of free end 17 outgoing of coupler 6; And the 0.980 μ m pumping light power that does not utilize of amplifier of the present invention is reduced to below 0.1%.Although these luminous powers of being fully used not are the light that all is converted into 1.553 mum wavelengths, make the gain of 1.553 mum wavelengths improve 5dB.
Further describe the present invention below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of fiber amplifier of the present invention.Wherein, label 1 is a driving power, and 2 is pump laser, 3 is monomode fiber, and 4 for closing ripple formula optical fibre wavelength-division multiplex coupler, and 5 is doped fiber, 6 is partial wave formula optical fibre wavelength-division multiplex coupler, 7 is output signal optical fiber, and 8 for suppressing the grating that spontaneous radiation is amplified, 9 gratings for the reflection pumping wavelength, 11,12,13,14 be the welding point, 15,16 are the end face that does not connect optical fiber of coupler output, and 17 is the coupler output port, and 18,19 are grating.
As shown in Figure 1, this fiber amplifier comprises driving power 1, is used for controlling semiconductor pumped sharp Light device 2 go out luminous power and temperature, but designed, designed, also can be with pump laser 2 from market On buy.
By the present invention, need control semiconductor laser 2 to be in a certain specified temp, can send out Penetrate stable specific wavelength, and make the laser of this wavelength just can be doped the optical fiber absorption, from And the best pumping efficiency of acquisition. Doping composition for different must have different optimal wavelengths Value. For example to er-doped (Er3+) optical fiber, this wavelength is 0.980nm. Defeated through tail optical fiber The luminous power that goes out should be greater than 50mw.
The single-mode fiber of the label 3 expression transmission communication signals among Fig. 1. The core diameter of this single-mode fiber 3 (diameter) for example is 9 μ m, and surrounding layer for example is 125 μ m (diameter). In leading to of optical fiber 3 transmission News signal S for example is that wavelength is the optical signal of 1.553 μ m.
Wavelength is respectively 0.980 μ m has the pumping of 1.553 μ m and communication signal S to fail by two respectively Inbound port enters and closes ripple formula optical fibre wavelength-division multiplex coupler 4, and its insertion loss representative value is 2dB. Close Optical signal after the ripple coupling is exported at its output port. Bright dipping on output port ratio is made 900: 1. The bigger port of luminous power that goes out wherein connects doped fiber 5 in order to amplify; Another Port can connect detecting instrument or make free end. For prevent end face reflection its end face can be worn into Fibre core is 11 ° angle. The used coupler 4 of the present invention can have been bought or customize in market.
The doped fiber 5 that the present invention adopts for example can be that core diameter is that 6 μ m, cladding diameter are that 125 μ m, length 48m, cutoff wavelength are the Er that mixes of 0.97 μ m3+Optical fiber. Mix Er3+Concentration be 100PPM. This optical fiber is on sale on market.
In the centre position of doped fiber 5, for example apart from the input port 20m place of optical fiber 5 and apart from optical fiber 5 Output port is that the 28m place scribes a grating 8 that suppresses the spontaneous radiation amplification. 8 band resistances of grating filter The effect of ripple device, its centre wavelength are 1.528nm, and bandwidth is 1nm, and central point reflectivity is 60%. This light Grid have the effect that makes gain spectrum flattening and broadening, and it is 0.2dB at the representative value of signal wavelength loss.
Grating 8 is divided into two fiber sections 18 and 19 with doped fiber 5.In the position of fiber section 19, also cut out the grating 9 of another reflection pumping wavelength near output port.For example, scribe grating 9 at distance output port 20cm place.Grating 9 plays band pass filter, and its centre wavelength is 980nm, and half-breadth is 1nm, and the central point reflectivity is 90%, because grating 9 has been arranged, makes the pump light that does not obtain as yet utilizing once more by doped fiber, has improved utilization ratio.Therefore, can under identical pump power and identical gain amplifier condition, shorten the length of required doped fiber.
Can there be multiple known method on doped fiber 5, to make grating 8 and 9.For example, a kind of method is to be coated with photoresists after grinding off fiber cladding, and forms interference fringe with double beam interferometry, carries out the exposure of certain hour (for example 20 seconds) again, adds protective layer then.Above-mentioned technology is respectively the maturation process that is used to manufacture wavelength division multiplexer, optical fiber directional coupler and holographic.
The another kind of method of manufacturing grating on optical fiber is the optical fiber fuse of mixing germanium that utilizes two bundle Ultra-Violet Laser (wavelength 224nm) irradiation removing overcoats, two bundle Ultra-Violet Lasers is formed in the space at optical fiber place interfere.The variation of interference strength makes optical fiber fuse refractive index respective change.The position and the interference pattern of control optical fiber just can form the grating that needs on fiber cores.
Also having a kind of way, is to utilize a template grating as a mask, with a branch of strong ultraviolet laser direct irradiation, thereby forms a grating that duplicates on fiber cores.
Partial wave formula optical fibre wavelength-division multiplex coupler of label 6 expressions among Fig. 1, its receives the light signal through amplifying from doped fiber 5, and it is that light and the unemployed wavelength of 1.553 μ m is the light of 0.98 μ m that two output port is exported respectively through the wavelength that has amplified.This communication signal can be drawn by output signal optical fiber 7.Another output port 17 can be used as the monitoring to light utilization efficiency of pumping source wavelength etc.
The tail optical fiber that available monomode fiber welding instrument will close ripple formula Wavelength division coupler 4 and signal optical fibre 3 and pumping source 2 is welding together (also can coupler 4 and signal optical fibre 3 be coupled together with the monomode fiber flexible jumper), and with this welding instrument single mode doped fiber 5 and coupler 4 is welding together.Wave division multiplex coupler 6 also carries out same welding with doped fiber 5.The optical loss of above-mentioned all welding point (representing with label 11,12,13,14 respectively among Fig. 1) all should be controlled at below the 0.1dB, and is the smaller the better.And to after welding, carry out heat treated,, further reduce loss to improve coupling efficiency.Heating-up temperature is 140 ℃, and the time is 20 minutes.The end face that does not connect optical fiber of coupler output (15,16) should be worn into the angle (angle in finger tip face and optical fiber axle center) about 11 °, in order to avoid form the total internal reflection of the light that is unfavorable for pumping source and signal source on this surface.This output port can be used for the luminous power of pumping source and signal source or the monitoring of wavelength.
Preferred embodiment is as follows:
This doped fiber is for mixing Er
3+Cut-off wavelength be the optical fiber of 0.97 μ m; The centre wavelength of first grating is 1528nm, and half-breadth is 1nm, and central point reflectance is that the centre wavelength of 60%, the second grating is 980nm, and half-breadth is 1nm, and the central point reflectivity is 90%;
First grating and/or second grating are by grinding off fiber cladding, be coated with photoresists, and relate to method with the dried sweat of dual-beam and form interference fringe, scribe through exposure;
First grating and/or second grating are to produce to interfere according to the optical fiber fuse of mixing germanium by two bundle Ultra-Violet Lasers to form;
First grating and/or second grating utilize the template grating to form as mask and with a branch of UV-irradiation.
Claims (2)
1, a kind of fiber amplifier that has two light canopies, comprise successively serial connection driving power (1), semiconductor pump laser (2), close ripple formula optical fibre wavelength-division multiplex coupler (4), doped fiber (5), partial wave formula optical fibre wavelength-division multiplex coupler (6) and output signal optical fiber (7), this fiber amplifier also comprises the monomode fiber (3) of transmission communication signal, communication signal S on the said monomode fiber (3) is input to an input port of the ripple formula optical fiber wavelength division coupler (4) of mediating, and it is characterized in that:
A, be carved with the first smooth canopy (8) at the mid portion of doped fiber (5);
B, be carved with second grating (9) near the position of said fiber-optic output mouth at the back segment of doped fiber (5).
2,, it is characterized in that said doped fiber (5) is for mixing Er according to the described fiber amplifier of claim 1
3+The cardiac wave length of cutting be the optical fiber of 0.97 μ m;
The centre wavelength of the wherein said first smooth canopy is 1.528nm, and bandwidth is 1nm, and the central point reflectivity is 60%;
The centre wavelength of wherein said second grating is 980nm, and bandwidth is 1nm, and the central point reflectivity is 90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93114035A CN1037735C (en) | 1993-11-11 | 1993-11-11 | Optical fibre amplifier with dual rasters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93114035A CN1037735C (en) | 1993-11-11 | 1993-11-11 | Optical fibre amplifier with dual rasters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1102736A CN1102736A (en) | 1995-05-17 |
| CN1037735C true CN1037735C (en) | 1998-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93114035A Expired - Fee Related CN1037735C (en) | 1993-11-11 | 1993-11-11 | Optical fibre amplifier with dual rasters |
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| Country | Link |
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| CN (1) | CN1037735C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19740743C1 (en) * | 1997-09-16 | 1999-01-21 | Siemens Ag | Optical amplifier with gain control |
| CN102540622B (en) * | 2012-01-15 | 2014-10-08 | 中国人民解放军国防科学技术大学 | High-gain low-noise ytterbium-doped optical fiber amplifier based on gain competition and mixing pumping |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992009150A1 (en) * | 1990-11-20 | 1992-05-29 | British Telecommunications Public Limited Company | An optical network |
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1993
- 1993-11-11 CN CN93114035A patent/CN1037735C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992009150A1 (en) * | 1990-11-20 | 1992-05-29 | British Telecommunications Public Limited Company | An optical network |
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| Publication number | Publication date |
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| CN1102736A (en) | 1995-05-17 |
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