CN209198829U - Polarization-maintaining rare-earth doped optical fibre amplifier - Google Patents
Polarization-maintaining rare-earth doped optical fibre amplifier Download PDFInfo
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- CN209198829U CN209198829U CN201821030319.9U CN201821030319U CN209198829U CN 209198829 U CN209198829 U CN 209198829U CN 201821030319 U CN201821030319 U CN 201821030319U CN 209198829 U CN209198829 U CN 209198829U
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Abstract
Polarization-maintaining rare-earth doped optical fibre amplifier, it is related to fiber optical amplifier technology field, its structure includes the polarization-maintaining fiber coupler for connecting polarization-maintaining input light and polarization-maintaining output light, single mode wavelength division multiplexer, single mode isolator, pump light source, rare-earth doped optical fibre and optical fiber faraday rotation mirror, the input port of the output port connection single mode wavelength division multiplexer of polarization-maintaining fiber coupler, the single mode wavelength division multiplexer input port also passes through single mode isolator connection pump light source, the first section of the delivery outlet connection rare-earth doped optical fibre of single mode wavelength division multiplexer, the tail end of rare-earth doped optical fibre connects faraday rotation mirror, the utility model can be realized the polarization-maintaining light amplification singly polarized, but also it can support the polarization-maintaining light amplification polarized entirely, it can be used to need in single optically amplified link for polarizing and keeping keeping with full polarization, and it is at low cost.
Description
Technical field
The utility model relates to fiber optical amplifier technology fields, more particularly to polarization-maintaining rare-earth doped optical fibre amplifier.
Background technique
Rare-earth doped optical fibre amplifier technology is commonly used for high-gain, wide bandwidth, low noise, low-loss full light amplification,
And its transmission line coupling loss it is low, to transmission signal format and bit rate transparent it is strong the advantages that, be New Generation Optical
Essential Primary Component in fiber communication system；The today flourished simultaneously in optical fiber sensing technology, over long distances, on a large scale
Optical fiber sensing network in it is also indispensable need to use rare-earth doped optical fibre amplifier, e.g., oil pipeline, high-voltage fence,
In the safety monitoring of the infrastructure such as gas pipeline, communications optical cable all fibre circuit can be made up with rare-earth doped optical fibre amplifier
Loss, and improve signal light size, improve the sensitivity of signal detection.There are one in communication system and sensor-based system
Polarization state is kept in the especial operation required a bit, it is necessary to use polarization-maintaining rare-earth doped optical fibre amplifier, such as high speed
Coherent light communication, light needs to keep the polarization state of two-beam consistent when relevant；And sensing measurement is carried out using polarization state
Optical fiber sensing system in, need to require the polarization state of light source constant.
In the prior art, in order to obtain the amplifier that tool polarization-stable exports, i.e. polarization-maintaining amplifier, polarization-maintaining is generallyd use
Er-doped fiber is realized.The use of polarization-maintaining Er-doped fiber improves the cost of fiber amplifier, causes this amplifier price aobvious
It writes and is higher than common fiber amplifier.
Utility model content
The purpose of this utility model is that avoiding shortcoming in the prior art and providing polarization-maintaining rare-earth doped optical fibre and put
Big device, cost is relatively low for the polarization-maintaining rare-earth doped optical fibre amplifier.
The purpose of this utility model is achieved through the following technical solutions:
Polarization-maintaining rare-earth doped optical fibre amplifier is provided, including the polarization-maintaining light for connecting polarization-maintaining input light and polarization-maintaining output light
Fine coupler, single mode wavelength division multiplexer, single mode isolator, pump light source, rare-earth doped optical fibre and optical fiber faraday rotation mirror are protected
The input port of the output port connection single mode wavelength division multiplexer of inclined fiber coupler, the single mode wavelength division multiplexer input port also passes through
Single mode isolator connects pump light source, and the first section of the delivery outlet connection rare-earth doped optical fibre of single mode wavelength division multiplexer is rear-earth-doped
The tail end of optical fiber connects faraday rotation mirror.
Wherein, the single mode wavelength division multiplexer is single mode 80/1550nm wavelength division multiplexer.
Wherein, the polarization-maintaining fiber coupler is the polarization-maintaining fiber coupler that splitting ratio is 50:50.Wherein, the optical fiber
Faraday rotation mirror includes the optical fiber head set gradually on the same axis, collimator, Faraday rotator and reflecting mirror.
Wherein, the single mode isolator includes the first optical fiber collimator, first angle of wedge set gradually on the same axis
Piece, Faraday rotator, the second angle of wedge piece and the second optical fiber collimator have a magnet ring to be set to first wedge cornual plate, faraday's rotation
Turn the outside of device and the second angle of wedge piece three, magnet ring is located on the axis.
The utility model has the beneficial effects that the polarization-maintaining rare-earth doped optical fibre amplifier of the utility model, including for connecting
It is the polarization-maintaining fiber coupler of polarization-maintaining input light and polarization-maintaining output light, single mode wavelength division multiplexer, single mode isolator, pump light source, dilute
Native doped fiber and optical fiber faraday rotation mirror, the input of the output port connection single mode wavelength division multiplexer of polarization-maintaining fiber coupler
Mouthful, the single mode wavelength division multiplexer input port also passes through single mode isolator connection pump light source, the delivery outlet of single mode wavelength division multiplexer
The first section of rare-earth doped optical fibre is connected, the tail end of rare-earth doped optical fibre connects faraday rotation mirror, and the utility model can be realized
The polarization-maintaining light amplification singly polarized, but also can support the polarization-maintaining light amplification polarized entirely can be used to needing single polarize to keep and complete
It polarizes in the optically amplified link kept, and at low cost.
Detailed description of the invention
Utility model is described further using attached drawing, but the embodiment in attached drawing does not constitute and appoints to the utility model
What is limited, for those of ordinary skill in the art, without creative efforts, can also be according to the following drawings
Obtain other attached drawings.
Fig. 1 is the schematic illustration of the polarization-maintaining rare-earth doped optical fibre amplifier of the utility model.
Fig. 2 is the structural schematic diagram of the single mode isolator of the utility model.
Fig. 3 is the structural schematic diagram of the faraday rotation mirror of the utility model.
Include in figure:
Rare-earth doped optical fibre 2, faraday rotation mirror 3, polarization-maintaining fiber coupler 7, single mode 80/1550nm wavelength division multiplexer 8,
980nm pump light source 9, single mode isolator 10,
Magnet ring 21, the first optical fiber collimator 25, first wedge cornual plate 23, Faraday rotator 22, the second angle of wedge piece 24, second
Optical fiber collimator 26,
Optical fiber head 101, collimator 102, Faraday rotator 12, reflecting mirror 13.
Specific embodiment
The utility model is further described with the following Examples.
The polarization-maintaining rare-earth doped optical fibre amplifier of the present embodiment, as shown in Figure 1, including the polarization-maintaining light that splitting ratio is 50:50
Fine coupler 7, single mode 80/1550nm wavelength division multiplexer 8,980nm pump light source 9, single mode isolator 10, rare-earth doped optical fibre 2,
Faraday rotation mirror 3.
Specific connection type is that the port 7c of polarization-maintaining fiber coupler 7 connects single mode 80/1550nm wavelength division multiplexer 8, single
Mould WDM connection pump light source 9 (pump light source is followed by single mode isolator 10) and rare-earth doped optical fibre 2, it is last rear-earth-doped
Optical fiber tail-end connects faraday rotation mirror 3.Input light is inputted by the 7a of polarization-maintaining fiber coupler 7, successively by path 7-8-2-
3, polarization state is rotated by 90 ° at faraday rotation mirror 3, and then reversed is successively 3-2-8-7 by path, reaches polarization maintaining optical fibre coupling
Clutch, at this time due to the characteristic of coupler, light energy output is exported by the port 7a and 7b, the polarization state and input light polarization in this time
State angle is 90 °, is rotated by 90 ° welding by polarization maintaining optical fibre to select output light to transmit along polarization maintaining optical fibre long axis when output.Tool
The port 7a, is rotated by 90 ° welding by gymnastics conduct, can make input light defeated by the port 7a 7b along polarization maintaining optical fibre long axis in this way
Fashionable, light and input light by amplification transmit in polarization maintaining optical fibre all along polarization maintaining optical fibre long axis.Welding is rotated by 90 ° with optical fiber
To compensate for the polarization state of optics faraday rotation mirror change.
The Bi-directional amplifier of polarization-maintaining light that the present embodiment can be realized the polarization-maintaining light singly polarized and polarize more, and it is at low cost.Wave
Division multiplexer (WDM) be by a series of carrying informations but wavelength it is different optical signal synthesis it is a branch of, transmitted along simple optical fiber；
Some way is used again in receiving end, by the separated communication technology of the optical signal of each different wave length.This technology can exist simultaneously
Multiple signals are transmitted on a piece optical fiber, are all transmitted by the light of certain specific wavelength per signal all the way, here it is a wavelength to believe
Road.
Two or more optical wavelength signals are allowed respectively to transmit by different optical channels simultaneously in same root optical fiber
Information, referred to as light WDM technology, abbreviation WDM.Optical wavelength division multiplexing includes frequency division multiplexing and wavelength-division multiplex.Optical frequency division multiplex
(frequency-division multiplexing, FDM) technology and optical wavelength division multiplexing (WDM) technology without significant difference because
Light wave is a part of electromagnetic wave, and the frequency and wavelength of light have single corresponding relationship.Usually it is also understood that, optical frequency division
Multiplexing refers to the subdivision of light frequency, and optical channel is very intensive.Optical wavelength division multiplexing refers to the rough segmentation of light frequency, the road Guang Bei relatively far apart, very
To in optical fiber different windows.
Optical wavelength division multiplexing is normally applied wavelength division multiplexer and demultiplexer (also referred to as multiplexer/demultiplexer) is respectively placed in light
Fine both ends, realize the coupling of Different lightwave with separate.The principle of the two devices is identical.Light wavelength division multiplexing it is main
Type has a fused tapered, medium membranous type, grating type and four kinds of plane.Its key property index is insertion loss and isolation
Degree.After using wavelength division multiplexing equipment in optical link, the incrementss of optical link loss are known as the insertion damage of wavelength-division multiplex
Consumption.When wavelength 11, when l2 is transmitted by same optical fiber, mixed with the power of input terminal l2 in channel-splitting filter and 11 output end optical fiber
The difference between power entered is known as isolation.
As shown in Fig. 2, the single mode isolator 10 include set gradually the first optical fiber collimator 25 on the same axis,
First wedge cornual plate 23, Faraday rotator 22, the second angle of wedge piece 24 and the second optical fiber collimator 26, a magnet ring 21 are set to first wedge
The outside of 24 three of cornual plate 23, Faraday rotator 22 and the second angle of wedge piece, magnet ring 21 are located on the axis.
Single mode isolator, belongs to optoisolator, is a kind of Passive Optical Components for only Unidirectional light being allowed to pass through, working principle
It is the nonreciprocity based on Faraday rotation.It can be isolated well by optoisolator by the light of optical fiber echo reflection.Light every
The Faraday effect of magneto-optical crystal is mainly utilized from device.The characteristic of optoisolator is: positive insertion loss is low, reverse isolation degree
Height, return loss are high.Optoisolator is that light is allowed, by preventing the passive device passed through round about, to make to a direction
With being limited the direction of light, make light can only one direction transmission, can be by optoisolator by the light of optical fiber echo reflection
Isolation well improves light wave transmissions efficiency.
Its effect is that the reverse transfers light for preventing from generating due to various reasons in optical path produces light source and light path system
Raw adverse effect.For example, an optoisolator is installed between semiconductor laser light source and optical transmission system, it can be in very great Cheng
The adverse effect that reflected light generates the spectral output power stability of light source is reduced on degree.In high speed directly modulation, directly inspection
It surveys in optical fiber telecommunications system, reverse transfers light can generate additional noise, deteriorate the performance of system, this is also required to optoisolator
It eliminates.Optoisolator is loaded at the both ends of doped fiber in fiber amplifier, and the operation is stable of fiber amplifier can be improved
Property, if back reflected laser in entering signal source (laser), will cause the big ups and downs of signal source without it.In coherent light
In long-distance optical fiber communication system, one optoisolator is installed every a distance, it is possible to reduce stimulated Brillouin scattering causes
Power loss.Therefore, optoisolator is measured in fiber optic communication, optical information processing system, Fibre Optical Sensor and precision optics is
It is played an important role in system.
The characteristics of optoisolator is high-isolation, filter with low insertion loss；High reliability, high stability；Extremely low Polarization Dependent Loss
And polarization mode dispersion.
As shown in figure 3, the optical fiber faraday rotation mirror 3 includes the optical fiber head 101 set gradually on the same axis, standard
Straight device 102, Faraday rotator 12 and reflecting mirror 13.
Faraday rotation mirror: the device that the polarization state of light can be made to rotate using Faraday effect.
Faraday rotation mirror is a kind of magneto-optical device, and light is propagated in the transparent medium in magnetic field.Magnetic direction with
Direction of beam propagation is identical or opposite.If light is the linearly polarized light of a direction, polarization direction when light passes through medium
Constantly change.Total rotation angle is β=V B L,
Wherein V is the Verdet constant of material, and B is magnetic flux (on the direction of propagation), and L is the length of medium.Wei Erde
Constant be it is closely related with wavelength, wavelength is longer, and constant is smaller.
The variation of polarization direction is only related with the symbol of magnetic direction and Verdet constant.If linearly polarized light first passes through method
Revolving mirror is drawn, again by faraday rotation mirror after reflecting mirror, then rotation angle when rotation angle is once-through
Two times, rather than cancel out each other.This nonreciprocal property is distinguished faraday rotation mirror with wave plate and polarizer.
It is appreciated that the physical significance of polarization state rotation, linearly polarized light can be regarded as to the superposition of two circularly polarized lights.Magnetic field
Two circularly polarized lights are made to generate phase velocity poor.And relative phase shift then corresponds to the variation in linearly polarized light direction.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (5)
1. polarization-maintaining rare-earth doped optical fibre amplifier, it is characterised in that: including for connecting polarization-maintaining input light and polarization-maintaining output light
Polarization-maintaining fiber coupler, single mode wavelength division multiplexer, single mode isolator, pump light source, rare-earth doped optical fibre and optical fiber faraday rotation
Tilting mirror, the input port of the output port connection single mode wavelength division multiplexer of polarization-maintaining fiber coupler, the input of single mode wavelength division multiplexer
Mouth also connects pump light source by single mode isolator, and the delivery outlet of single mode wavelength division multiplexer connects the first section of rare-earth doped optical fibre,
The tail end of rare-earth doped optical fibre connects faraday rotation mirror.
2. polarization-maintaining rare-earth doped optical fibre amplifier as described in claim 1, it is characterised in that: the single mode wavelength division multiplexer is
Single mode 80/1550nm wavelength division multiplexer.
3. polarization-maintaining rare-earth doped optical fibre amplifier as described in claim 1, it is characterised in that: the polarization-maintaining fiber coupler is
Splitting ratio is the polarization-maintaining fiber coupler of 50:50.
4. a kind of polarization-maintaining rare-earth doped optical fibre amplifier as described in claim 1, it is characterised in that: the optical fiber faraday rotation
Tilting mirror includes the optical fiber head set gradually on the same axis, collimator, Faraday rotator and reflecting mirror.
5. a kind of polarization-maintaining rare-earth doped optical fibre amplifier as described in claim 1, it is characterised in that: the single mode isolator packet
Include the first optical fiber collimator, first wedge cornual plate, Faraday rotator, the second angle of wedge piece and set gradually on the same axis
Two optical fiber collimators have a magnet ring to be set to the outside of first wedge cornual plate, Faraday rotator and the second angle of wedge piece three, magnet ring
On the axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821030319.9U CN209198829U (en) | 2018-06-29 | 2018-06-29 | Polarization-maintaining rare-earth doped optical fibre amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821030319.9U CN209198829U (en) | 2018-06-29 | 2018-06-29 | Polarization-maintaining rare-earth doped optical fibre amplifier |
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| CN209198829U true CN209198829U (en) | 2019-08-02 |
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| CN201821030319.9U Active CN209198829U (en) | 2018-06-29 | 2018-06-29 | Polarization-maintaining rare-earth doped optical fibre amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112652939A (en) * | 2020-12-22 | 2021-04-13 | 武汉菩济医疗科技有限公司 | Optical cable type ultrafast optical fiber laser |
| CN113675711A (en) * | 2021-08-24 | 2021-11-19 | 长春理工大学 | Wavelength tunable gain switch pulse fiber laser |
-
2018
- 2018-06-29 CN CN201821030319.9U patent/CN209198829U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112652939A (en) * | 2020-12-22 | 2021-04-13 | 武汉菩济医疗科技有限公司 | Optical cable type ultrafast optical fiber laser |
| CN113675711A (en) * | 2021-08-24 | 2021-11-19 | 长春理工大学 | Wavelength tunable gain switch pulse fiber laser |
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Effective date of registration: 20220421 Address after: 523000 tenth buildings and 3 storey factory buildings of small science and technology enterprises Pioneer Park in the northern industrial city of Songshan Lake, Dongguan, Guangdong Patentee after: GUANGDONG FU'AN TECHNOLOGY DEVELOPMENT Co.,Ltd. Patentee after: Dongguan advanced optical fiber Application Technology Research Institute Co., Ltd Address before: 523000 tenth buildings and 3 storey factory buildings of small science and technology enterprises Pioneer Park in the northern industrial city of Songshan Lake, Dongguan, Guangdong Patentee before: GUANGDONG FU'AN TECHNOLOGY DEVELOPMENT Co.,Ltd. |