CN102195715A - Multi-level maintenance-free fiber long-distance relay amplifier - Google Patents
Multi-level maintenance-free fiber long-distance relay amplifier Download PDFInfo
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- CN102195715A CN102195715A CN2011100697055A CN201110069705A CN102195715A CN 102195715 A CN102195715 A CN 102195715A CN 2011100697055 A CN2011100697055 A CN 2011100697055A CN 201110069705 A CN201110069705 A CN 201110069705A CN 102195715 A CN102195715 A CN 102195715A
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- amplifier
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Abstract
In the invention, pump light sources of an active relay amplifier are injected from two ends of a fiber transmission system, and Er-doped fibers used as amplifiers are embedded in a transmission link, thus an active amplifier for relay points without external power sources is realized and the maintenance cost of the active amplifier can be reduced, even eliminated. For eliminating the nonlinear effect of photosignals, a method for accessing multiple sections of Er-doped fibers is adopted; based on the comprehensive design and consideration on the intensity of the pump light sources, interval of relay points without external power sources (distance among the Er-doped fibers used for amplifying on a fiber link), length of the Er-doped fibers used for amplifying and the like, the nonlinear effect of photosignals output after amplification is minimized, and optical transmission distance can be lengthened by multiple times as compared with the optical transmission distance of a fiber transmission system without an optical amplifier.
Description
Technical field
Please relate to a kind of optical relay that improves the Optical Fiber Transmission distance in this and amplify and transmission system the optical relay amplifier that especially in high-speed link, uses.
Background technology
The light signal of input optical fibre all has certain intensity restriction, with the light intensity that guarantees input in the scope of fiber nonlinear effect permission and can not influence light signal and detect; The decay of optical fiber transmission signal causes signal too weak and can not be detected by optical signal detector, so optical fiber all has certain transmission range.In order to prolong the transmission range of light signal, the method that adopts relaying to amplify is usually carried out active amplification to light signal behind a segment distance.The relay amplifier of active amplification all needs power supply, and need patrol and examine to guarantee the reliability of optical transmission line.
A kind of method that reduces the active relaying amplification is that one section optical fiber as amplifier is embedded transmission link, pump light injects from the optical fiber two ends, in the middle of fibre circuit, light signal is amplified, be usually used in the occasions that requirement is safeguarded less, active equipment is few such as submarine fiber cable.But the nonlinear effect of high speed optical fiber such as 10G, 40G, 100G is obvious, and the permission light intensity that nonlinear effect does not take place is very little, has therefore greatly reduced the coverage of fibre circuit, and making needs to increase multistage activated amplifier and increased maintenance cost.And aforementioned embedding amplifier causes the not enough of transmission range prolongation because the signal strength signal intensity after the relaying amplification can not be too strong, generally can only prolong twice, and longer distance then needs active relaying to amplify.
The amplification direction of fiber amplifier and pump light source incident direction are irrelevant, and be relevant with light signal incident direction to be amplified.
Summary of the invention
Because pump light source intensity is not influenced by nonlinear effect, the pump light source of injection fibre link can be very strong, increases the infringement that can avoid strong pump light signals leakage to cause behind the broken circuit protecting equipment.In order to reduce the number of activated amplifier, prolong the optical transmission distance, the pump light source of active relaying amplifier changed into by the optical fiber two ends inject, Er-doped fiber as amplifier then embeds transmission link, realize the activated amplifier of relay point dispense with outer connecting power, reduce even eliminated the maintenance cost of activated amplifier.
In order to eliminate the nonlinear effect in the high-speed light transmission link, the length of pump light source and amplifying fiber need be adjusted, the present invention adopts multistage to insert the method for Er-doped fiber, by intensity to pump light source, the non-transformer relay well is every (promptly amplifying with the distance of Er-doped fiber on optical fiber link), amplify with the length of Er-doped fiber etc. and carry out comprehensive Design and consideration, realize the nonlinear effect minimum of the output light signal of amplifier, realize simultaneously being multiple times than the optical transmission distance of unglazed amplifier optical fiber transmission system, even omnidistance non-transformer relaying amplifies in the middle of can realizing transmission node.For the fiber optic transmission system of some chromatic dispersion sensitivities, owing to need light signal is regenerated to eliminate the influence of chromatic dispersion after certain transmission range, this moment, the active relaying amplification was necessary, but quantity has also significantly reduced.
The beneficial effect of asking in this is, by the enforcement of asking in the basis, remote fiber optic transmission system can realize being multiple times than the transmission range of no image intensifer, greatly reduce simultaneously the quantity that needs the active relaying amplifier safeguarded on the transmission path again, even can constitute the remote fiber optic transmission system that all fronts Lu Buxu safeguards the active relaying amplifier, reduce administering and maintaining cost, improved the reliability of communication system.
Description of drawings
Accompanying drawing has comprised multistage and has amplified in the Er-doped fiber embedding Transmission Fibers of usefulness for having multistage power free relaying image intensifer Transmission Fibers system configuration schematic diagram in the Transmission Fibers system as shown in the figure, pump light source is injected from Transmission Fibers system two ends; Light signal injects from Transmission Fibers system one end, exports from the other end.This figure is a structure and connection diagram, and not representing that optical fiber is actual has many thick and how far transmission range has.
Embodiment
When implementing, can design by the following step:
1, pump light is injected from the two ends of Transmission Fibers system, be divided into multistage as the Er-doped fiber of amplifier and insert long-distance Transmission Fibers link, realize multistage amplifying optical signals;
2, by to the intensity of pump light source, each section as the distance of the Er-doped fiber of amplifier and the appropriate design of Er-doped fiber length, can guarantee that light signal strength after each grade amplification is in the permission range of light intensity of nonlinear effect minimum of optical fiber, and still have enough light intensity behind the extended fiber transmission range several times for optical signal detecting.
This is a principal character of the present invention, makes an explanation below in conjunction with Fig. 1.
As shown in Figure 1, L
iThe length of representing Transmission Fibers between two sections Er-doped fibers, optical signal transmission L
iDistance back intensity is by previous stage amplifier output intensity OUT
I-1Decay to IN
i, IN
iSignal input intensity as i level fiber amplifier.The two directional pump light source is P through transmission attenuation (by separately initial light intensity and when arriving i level amplifier Er-doped fiber position separately transmission range decision) the stack intensity of back at i level fiber amplifier place
i, P then
1With amplifier optical fiber length M at the corresponding levels
iDetermined the gain A of amplifier output light signal at the corresponding levels; Output light signal strength OUT
1=IN
i+ A.
Generally can allow L
1=L
jWith simplified design, after having fixed pump light source intensity, only need to change the length M of Er-doped fiber
iIt is this grade of may command Amplifier Gain.Therefore the length of the Er-doped fiber of the diverse location under different transmission ranges and the pump light source intensity is different.And the main points of design are that gain A should be able to compensate transmission range L
iIn attenuated optical signal, and final output light signal strength satisfies data and can accurately be detected and get final product.
The design of above-mentioned Fig. 1 and front, explanation are all just as the explanation to the principle of the invention and execution mode, rather than a concrete example.
Use L
i≠ L
jEr-doped fiber apart from design, only the end of pump light source from the Transmission Fibers system injected, the Er-doped fiber that amplifies usefulness changes the optical fiber with amplification of other types into, perhaps change pump light source injection fibre cooperation/be coupled into the optical fiber mode, these a few class situations all are not to substantial improvements of the present invention.
Claims (2)
1. an extended fiber transmission range and reduce the optical transmission system that active relaying amplifies, it is characterized in that, pump light is injected from the two ends of Transmission Fibers system, be divided into multistage as the Er-doped fiber of amplifier and insert long-distance Transmission Fibers link, realize multistage amplifying optical signals.
2. fiber optic transmission system that satisfies claim 1, it is characterized in that, by to the intensity of pump light source, each section as the distance of the Er-doped fiber of amplifier and the appropriate design of Er-doped fiber length, guaranteeing that light signal strength after each grade amplification is in the permission range of light intensity of nonlinear effect minimum of optical fiber, and still have enough light intensity behind the extended fiber transmission range several times for optical signal detecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100697055A CN102195715A (en) | 2011-03-23 | 2011-03-23 | Multi-level maintenance-free fiber long-distance relay amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100697055A CN102195715A (en) | 2011-03-23 | 2011-03-23 | Multi-level maintenance-free fiber long-distance relay amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102195715A true CN102195715A (en) | 2011-09-21 |
Family
ID=44603157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100697055A Pending CN102195715A (en) | 2011-03-23 | 2011-03-23 | Multi-level maintenance-free fiber long-distance relay amplifier |
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| CN (1) | CN102195715A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107210817A (en) * | 2015-01-21 | 2017-09-26 | 谷歌公司 | The optical communication network of power supplied locally |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2247900Y (en) * | 1995-06-26 | 1997-02-19 | 清华大学 | Cascade fibre-optic amplifier with precoupling-isolating amplifying ring |
| CN2381070Y (en) * | 1999-07-11 | 2000-05-31 | 深圳市华为技术有限公司 | Cascade erbium-mixed optical-fiber amplified pump light-source switch-in apparatus |
| WO2006029569A1 (en) * | 2004-09-15 | 2006-03-23 | Huawei Technologies Co., Ltd. | An optical transmission system and the amplify method |
| US7424191B2 (en) * | 2003-04-28 | 2008-09-09 | The Furukawa Electric Co., Ltd. | System for measuring the wavelength dispersion and nonlinear coefficient of an optical fiber |
-
2011
- 2011-03-23 CN CN2011100697055A patent/CN102195715A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2247900Y (en) * | 1995-06-26 | 1997-02-19 | 清华大学 | Cascade fibre-optic amplifier with precoupling-isolating amplifying ring |
| CN2381070Y (en) * | 1999-07-11 | 2000-05-31 | 深圳市华为技术有限公司 | Cascade erbium-mixed optical-fiber amplified pump light-source switch-in apparatus |
| US7424191B2 (en) * | 2003-04-28 | 2008-09-09 | The Furukawa Electric Co., Ltd. | System for measuring the wavelength dispersion and nonlinear coefficient of an optical fiber |
| WO2006029569A1 (en) * | 2004-09-15 | 2006-03-23 | Huawei Technologies Co., Ltd. | An optical transmission system and the amplify method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107210817A (en) * | 2015-01-21 | 2017-09-26 | 谷歌公司 | The optical communication network of power supplied locally |
| CN107210817B (en) * | 2015-01-21 | 2019-09-24 | 谷歌有限责任公司 | The optical communication network of power supplied locally |
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Application publication date: 20110921 |