CN1317836C - Erbium doped optical fibre light amplifier - Google Patents
Erbium doped optical fibre light amplifier Download PDFInfo
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- CN1317836C CN1317836C CNB021089868A CN02108986A CN1317836C CN 1317836 C CN1317836 C CN 1317836C CN B021089868 A CNB021089868 A CN B021089868A CN 02108986 A CN02108986 A CN 02108986A CN 1317836 C CN1317836 C CN 1317836C
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- light
- road
- amplifier
- gain
- gratings
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Abstract
The present invention relates to an Erbium-doped optical fiber light amplifier which uses a pumping laser to pump two paths of optical amplification systems. Pump light generated by the pumping laser is divided in half by a 50/50 splitter to be respectively used by two paths of signals. The present invention can also comprise four low reflectivity optical fiber gratings of signal out-of-band specific wavelength, and thereby, a gain locking function of the optical amplifier is realized. The amplifier can independently amplify and can automatically gain to lock two paths of optical signals having no relation, and the control optical signal of the specific wavelength can be lased when the upper power and the lower power of a plurality of channels fluctuate, and thereby, the gain of all multistage amplifiers on the whole ring net is automatically locked. The present invention enhances the system integration level and reduces the cost of the overall system.
Description
Technical field
The present invention relates to the optical communication transmission field, specifically is a kind of erbium-doped fiber amplifier.
Technical background
In the middle of the metropolitan area looped network, the distance of each adjacent sites is generally all shorter, needs the line loss of compensation less, and is therefore generally not high to the gain requirement of image intensifer, and needs configuration in pairs.Conventional at present image intensifer has erbium-doped fiber amplifier (EDFA), semiconductor optical amplifier (SOA), Raman distributed amplifier (FRA) etc.
At present different to make with the most use be EDFA to best performance.The pump laser minimum power that EDFA uses is generally all more than 80mW, so the gain that EDFA provided often far surpasses the actual demand of metropolitan area looped network.It is little that SOA has a volume, the advantage that integrated level is high, but having the big Polarization-Sensitive shortcoming of noise factor, the non-linear phenomena of SOA has seriously been brought a lot of application limitations in addition.FRA generally is used for long haul transmission system, and with high costs.
Summary of the invention
The purpose of this invention is to provide a kind of erbium-based amplifier, the short characteristics of metropolitan area network span that are fit to go in ring can make full use of pump power.
For achieving the above object, solution of the present invention is:
Two-way independent light signal light transmission road, each road comprises: wave multiplexer, erbium-doped fiber, separate by the two-in-one isolator of serial connection on described two-way independent light signal light transmission road; Also comprise a pump laser and splitter, each the road pump light of two-way pump light of splitter output that is arranged in the back level of pump laser enters Er-doped fiber with the wave multiplexer of each the road light signal that separates through two-in-one isolator by corresponding transmission light path; Also comprise four gratings, be symmetrically placed in respectively in the described two paths of signals transmission path, realize the gain locking function of image intensifer.
Described four gratings are fiber gratings of the antiradar reflectivity of the outer specific wavelength of signal band.
Described four gratings lay respectively at the prime of wave multiplexer in described each road and the back level of Er-doped fiber.
Described four gratings lay respectively at the both sides of each road Er-doped fiber.
In the dense wave division multipurpose looped network, dispose the erbium doped optical fibre light amplifier of the above band fiber grating making a start of certain website, in its downstream site configuration not with the amplifier of fiber grating, the amplifier of grating belt can make the loop network link cascade does not commonly automatically lock with the light amplifier gain of fiber grating yet, thereby satisfies the demand of dense wavelength division multiplexing system to the light amplifier gain locking.
The EDFA pump mode that this programme provided is particularly suitable for the short characteristics of belt metropolitan area network span, uses this scheme to carry out relaying at the metropolitan area looped network and amplifies, and can make full use of pump power, and an EDFA module has the function of two image intensifers.And removing first image intensifer of loop uses the EDFA of this pump mode of employing of other cascades in the grating outer ring all need not re-use grating, just can up and down can swash the control light signal that penetrates this specific wavelength during power fluctuation, automatically lock all Transducer Power Gain of Multistage Amplifiers on the whole looped network at a plurality of channels.Thereby can reduce the cost of whole loop network system, and the shared space of EDFA reduced half, improved level of integrated system.
Description of drawings
Fig. 1 is the basic light channel structure figure of this erbium-based amplifier;
Fig. 2 is the image intensifer light channel structure figure that light-operated gain locking is arranged.
Embodiment
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Light path shown in Figure 1 comprises: two ways of optical signals input 1 and 2; Input coupler 3 and 4; Input photo-detector 5 and 6; Input isolator 7 is one 2 and closes 1 array optical isolator, is equivalent to two independently input isolators; Input wave multiplexer 8 and 9, pump light and flashlight are coupled in the Er-doped fiber by wave multiplexer signal are amplified; 50/50 splitter 10, the pump light that pump laser 11 is sent insert wave multiplexer 8 and wave multiplexer 9 and two-channel independent respectively and close ripple and enter erbium fine 12 and 13 signal is amplified in two; Output isolator 14 also is one and is equivalent to 2 of two independent output isolators and closes 1 array optical isolator; Output coupler 15 and 16; Output detector 17 and 18; Independent amplifying signal output 19 and 20.Realized with two of pump laser pumpings simultaneously optical amplification system independently by Fig. 1 light channel structure, and, reduced the cost and the space of two isolators, can be integrated in one independently in the module by using 2 to close 1 array optical isolator.This structure has made full use of the power of pumping, has reduced the volume of half, and has reduced the cost of a pump laser and two optical isolators.
In order to satisfy the demand of dense wavelength division system, realize the gain locking function of image intensifer, above-mentioned light channel structure is further improved, see Fig. 2.
Compared to Figure 1, increased by four fiber gratings 21,22,23,24 in the light-operated gain locking erbium doped optical fibre light amplifier light channel structure, grating 21,22 lays respectively at the back level of input isolator 7, and grating 23,24 lays respectively at the back level of Er-doped fiber 12,13.These gratings can be selected the reflectivity reflection of certain wavelengths λ according to design, and do not exert an influence to the signal of other wavelength is transparent, thereby have constituted two independently at the FP laserresonator of a certain selected wavelength X.Basic theories according to laser, the condition of laser formation vibration is the loss GAIN=LOSS that the round of resonant cavity equals the chamber, and in the optical fiber FP chamber of Fig. 2, cavity loss is by the reflectivity R1 and the R2 decision of the fiber grating at two ends, chamber, and LOSS=-10*1g (R1*R2) is a constant constant.The gain of laser cavity inner laser af at wavelength lambda: G (λ)=G
0(λ) (1+P
l/ P
Sat.l)
-1Small signal gain G
0(λ) depend on the pumping level, when other wavelength signals increases force G
0(λ) descend, then laser power P
lTo descend to keep the optical maser wavelength gain constant, also constant by other wavelength gains of even spreading characteristic of erbium fibre, surpass critical value until signal light power, make the chamber gain less than cavity loss, laser will extinguish, and loses the gain locking function.With amplifier and the laser deposited as cistern, in limit of power, contained the automatic gain lock function that whole variable power have realized amplifier.Wavelength that can be by selecting suitable fiber grating and reflectivity and other light channel structure parameter satisfy the gain of our needs and the requirement of input power range.In dense wave division multipurpose (DWDM) looped network, can be at the configuration glazing control gain locking er-doped image intensifer of making a start of certain website, then dispose common er-doped image intensifer at the downstream website as Fig. 1 structure.When signal power reduced, the laser power that light-operated gain locking amplifier is produced will increase automatically, thereby has compensated reducing of signal power automatically, made the normal optical amplifier gain in downstream still keep stable; When signal power increased, the laser power that light-operated gain locking amplifier is produced will reduce automatically, thereby had compensated the increase of signal power automatically, still can make the normal optical amplifier gain in downstream keep stable.As seen in looped network, use a light-operated gain locking 2 to close 1 amplifier, the normal optical amplifier gain of loop network link cascade is also automatically locked, thereby satisfied the demand of dwdm system the light amplifier gain locking.
Claims (4)
1, a kind of erbium doped optical fibre light amplifier, comprise: two-way independent light signal light transmission road, each road comprises: wave multiplexer, erbium-doped fiber, separate by the two-in-one isolator of serial connection on described two-way independent light signal light transmission road, it is characterized in that: also comprise a pump laser and splitter, each the road pump light of two-way pump light of splitter output that is arranged in the back level of pump laser enters Er-doped fiber with the wave multiplexer of each the road light signal that separates through two-in-one isolator by corresponding transmission light path; Also comprise four gratings, be symmetrically placed in respectively in the described two paths of signals transmission path, realize the gain locking function of image intensifer.
2, erbium doped optical fibre light amplifier according to claim 1 is characterized in that described four gratings are fiber gratings of the antiradar reflectivity of the outer specific wavelength of signal band.
3, erbium doped optical fibre light amplifier according to claim 2 is characterized in that described four gratings lay respectively at the prime of wave multiplexer in described each road and the back level of Er-doped fiber.
4, erbium doped optical fibre light amplifier according to claim 2 is characterized in that described four gratings lay respectively at the both sides of each road Er-doped fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021089868A CN1317836C (en) | 2002-04-18 | 2002-04-18 | Erbium doped optical fibre light amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021089868A CN1317836C (en) | 2002-04-18 | 2002-04-18 | Erbium doped optical fibre light amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1452328A CN1452328A (en) | 2003-10-29 |
| CN1317836C true CN1317836C (en) | 2007-05-23 |
Family
ID=29220805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021089868A Expired - Lifetime CN1317836C (en) | 2002-04-18 | 2002-04-18 | Erbium doped optical fibre light amplifier |
Country Status (1)
| Country | Link |
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| CN (1) | CN1317836C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211087B (en) * | 2006-12-31 | 2011-08-10 | 华为技术有限公司 | Optical fibre amplifier and manufacture method and fiber communication system |
| CN102186066A (en) * | 2011-04-08 | 2011-09-14 | 上海大学 | Optical fiber wired television super-trunk line transmission system |
-
2002
- 2002-04-18 CN CNB021089868A patent/CN1317836C/en not_active Expired - Lifetime
Non-Patent Citations (3)
| Title |
|---|
| 光纤放大器的泵浦问题 卢文全，光通信技术，第20卷第4期 1996 * |
| 光纤放大器的泵浦问题 卢文全，光通信技术，第20卷第4期 1996;用于EDFA增益锁定的光纤光栅的制作 夏历，李栩辉，谢世钟，刘厚权，王文涛，范思伟，杜良帧，光电子·激光，第12卷第5期 2001 * |
| 用于EDFA增益锁定的光纤光栅的制作 夏历，李栩辉，谢世钟，刘厚权，王文涛，范思伟，杜良帧，光电子·激光，第12卷第5期 2001 * |
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| Publication number | Publication date |
|---|---|
| CN1452328A (en) | 2003-10-29 |
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Granted publication date: 20070523 |
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