CN109724634A - A kind of the light coherent receiver and method of automatic polarization equilibrium - Google Patents
A kind of the light coherent receiver and method of automatic polarization equilibrium Download PDFInfo
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- CN109724634A CN109724634A CN201811639982.3A CN201811639982A CN109724634A CN 109724634 A CN109724634 A CN 109724634A CN 201811639982 A CN201811639982 A CN 201811639982A CN 109724634 A CN109724634 A CN 109724634A
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- polarization
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Abstract
The present invention relates to a kind of light coherent receivers of automatic polarization equilibrium, including the first coupler, the second coupler, third coupler, acousto-optic modulator, fiber amplifier, circulator, polarising beam splitter, detector, controller and automatically controlled Polarization Controller；First coupler is connect with acousto-optic modulator and automatically controlled Polarization Controller, and acousto-optic modulator is connect with fiber amplifier；Third coupler is connect with automatically controlled Polarization Controller；Controller is connect with the detector, and automatically controlled Polarization Controller is connect with the controller.The light coherent receiver of automatic polarization equilibrium provided by the invention is for statistical analysis by the light signal strength returned to back scattering in distributed sensing fiber, local oscillator optical signal polarization state is automatically adjusted using automatically controlled Polarization Controller and is compensated, realize the equilibrium that polarization split pole receives two ways of optical signals energy, influence of the treatment process to optical signal is small, equipment is simple and works well, and cost is relatively low.
Description
Technical field
The present invention relates to technical field of optical fiber communication, the light coherent reception more particularly to a kind of automatic polarization equilibrium is filled
It sets.
Background technique
Distributed optical fiber sensing system principle is to use optical fibers as sensing responsive element and transmission signal media simultaneously, is adopted
With advanced OTDR technique, the measurement to temperature and the different kinds of parameters such as strain along optical fiber at different location can be realized,
The fields such as building maintenance, health monitoring, geological prospecting, perimeter security protection have a wide range of applications and good prospect.Wherein
The polarization stochastic effects of back scattering optical signal in optical fiber can be effectively overcome using the sensing device of coherent diversity reception, however
The unbalanced validity for reducing the program of local oscillator light energy on two polarization directions.To overcome the problems, such as this, existing scheme is more
Using the resolving ideas based on full polarization fibre, but more stringent requirements are proposed for this polarization state to light source input light, and cost is high
It is expensive and complicated.
Summary of the invention
Based on this, it is necessary to which, at least one problem mentioned above, the light for providing a kind of automatic polarization equilibrium is relevant
Reception device and method.
A kind of light coherent receiver of automatic polarization equilibrium, including the coupling of the first coupler, the second coupler, third
Device, acousto-optic modulator, fiber amplifier, circulator, polarising beam splitter, detector, controller and automatically controlled Polarization Controller；Institute
It states the first coupler to connect with acousto-optic modulator and automatically controlled Polarization Controller, the acousto-optic modulator and the fiber amplifier
Connection, the fiber amplifier are connect with the circulator；The circulator is connect with the polarising beam splitter, the polarization
Beam splitter is also connect with second coupler；Second coupler also with the third coupler and the detector
Connection, the detector is for converting optical signals to electric signal；The third coupler and the automatically controlled Polarization Controller connect
It connects；The controller is connect with the detector, and the automatically controlled Polarization Controller is connect with the controller, and the controller is used
In analysis optical signal, the automatically controlled Polarization Controller is controlled.
As a preferred scheme, sensor fibre is also connected on the circulator；The circulator includes first
Port, second port and third port, the first port are connect with the fiber amplifier, described in the sensor fibre connection
Second port and the third port.
It further include analog-digital converter as a preferred scheme, the analog-digital converter connects the detector and institute
Controller is stated, for analog electrical signal to be converted to digital electric signal.
As a preferred scheme, the fiber amplifier uses erbium-doped fiber amplifier.
A kind of light coherent reception method of automatic polarization equilibrium, using the light coherent reception of such as above-mentioned automatic polarization equilibrium
Device executes the following steps:
Optical signal is divided by local oscillator light and transmitting light using first coupler；
It is to enter second coupler after X polarization state and Y polarization state for the transmitting light processing, while by the local oscillator
Light inputs second coupler, and two-way detection optical signal is respectively formed after second coupler；
The detection optical signal is obtained after the automatically controlled Polarization Controller processing and receives the backward of polarization equilibrium
Optical signal.
In one of the embodiments, it is described to the coupling optical signal through the specific of the automatically controlled Polarization Controller processing
Step includes:
The scattering root-mean-square value for counting the two-way detection optical signal obtains the energy of the polarization state in two-way detection optical signal
Measure difference；
The controller determines the energy differences and meets predetermined power difference range, receives the balanced light letter of the polarization
Number.
Further, it is more than the predetermined power difference range that the controller, which determines the energy differences, will be described
Backward optical signal inputs the automatically controlled Polarization Controller to adjust polarization state.
In one of the embodiments, second coupler and the detector respectively include two input ports and
Two output ports.
The light coherent receiver of automatic polarization equilibrium provided by the invention by dissipating backward in distributed sensing fiber
It is for statistical analysis to be emitted back towards the light signal strength come, local oscillator optical signal polarization state is automatically adjusted using automatically controlled Polarization Controller and is mended
It repays, realizes the equilibrium that polarization split pole receives two ways of optical signals energy, influence of the treatment process to optical signal is small, and equipment is simple
And work well, cost is relatively low.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the light coherent receiver of automatic polarization equilibrium in one embodiment of the invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more thorough
Comprehensively.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more phases
Any and all combinations of the listed item of pass
A kind of light coherent receiver of automatic polarization equilibrium is provided in one embodiment of the invention, as shown in Figure 1, it is wrapped
Include the first coupler, the second coupler, third coupler, acousto-optic modulator, fiber amplifier, circulator, polarising beam splitter,
Detector, controller and automatically controlled Polarization Controller.Wherein the first coupler and acousto-optic modulator and automatically controlled Polarization Controller connect
It connects, acousto-optic modulator is connect with fiber amplifier, and fiber amplifier is connect with circulator.Circulator and polarising beam splitter connect
It connects, polarising beam splitter is also connect with the second coupler.Second coupler is also connect with third coupler and detector, detection
Device is for converting optical signals to electric signal, for subsequent device analysis processing.Third coupler and automatically controlled Polarization Controller connect
It connecing, controller is connect with detector, and automatically controlled Polarization Controller is connect with controller again, and wherein controller is used to analyze optical signal,
And the concrete condition of the optical signal obtained in turn according to analysis controls automatically controlled Polarization Controller and works, automatically controlled Polarization Controller is used for
The analysis of optical signal polarization characteristic, is common a kind of device in the art, and working principle no longer excessively describes.
Specifically, sensor fibre is also connected on circulator, circulator is a kind of device for transmitting electromagnetic wave unidirectional loop
Part has multiport, and wherein the transmission of electromagnetic wave can only go in ring along one direction, and including at least has first port, second port
And third port, first port are connect with fiber amplifier, and sensor fibre connection second port and third port, from first end
Mouth is into second port goes out, by the reflection and transmission of sensor fibre, and from second port into third port goes out.
Detector converts optical signals to electric signal and is specifically generally converted to analog electrical signal, for convenient for processing, need by
Analog electrical signal is converted to digital electric signal, therefore smooth coherent receiver provided by the invention further includes analog-digital converter, mould
Number converter connects detector and controller, for analog electrical signal to be converted to digital electric signal.
Fiber optical amplifier technology is exactly that the rare earth element that can generate laser is mixed in the fibre core of optical fiber, is mentioned by laser
The direct current light stimulus of confession, make by optical signal amplified, there are many rare earth elements specifically adulterated, such as mixes praseodymium optical fiber and put
Big device mixes niobium fiber amplifier, and this programme selects common erbium-doped fiber amplifier.
It is equal using such as above-mentioned automatic polarization present invention simultaneously provides a kind of light coherent reception method of automatic polarization equilibrium
The light coherent receiver of weighing apparatus executes the following steps S100~step S300::
Step S100: optical signal is divided by local oscillator light and transmitting light using first coupler.Laser emitter generates
The first coupler is entered after optical signal, coupler is photoelectrical coupler, optical signal is divided into two parts by the first coupler,
It is respectively processed.
Step S200: being to enter the second coupler after X polarization state and Y polarization state for transmitting light processing, while by local oscillator light
The second coupler is inputted, two-way detection optical signal is respectively formed after the second coupler.Emit light to modulate by acousto-optic modulator
For pulse, then circulator is input to by erbium-doped fiber amplifier, into sensor fibre, the sensing through sensor fibre back scattering
After optical signal is input to circulator again, be divided into after X polarization state and two polarization states of Y polarization state after polarization beam apparatus respectively into
Enter into the second coupler.Meanwhile local oscillator light after automatically controlled Polarization Controller by being divided into two-way after third coupler, respectively
Into the second coupler.Two-way is exported after the second coupler coupling processing detects optical signal.Second coupler and detector are equal
Respectively include two input ports and two output ports.
Step S300: obtaining detection optical signal after the processing of automatically controlled Polarization Controller and receives the backward of polarization equilibrium
Optical signal.Specific steps include:
The scattering root-mean-square value for counting two-way detection optical signal obtains the energy difference of the polarization state in two-way detection optical signal
Value.Controller determines energy differences and meets predetermined power difference range, receives and polarizes balanced optical signal.
Further, do not exist when controller determines energy differences more than predetermined power difference range namely energy differences
When in predetermined power difference range, automatically controlled Polarization Controller is inputted to adjust polarization state to optical signal by after.Controller analyzes mould
The two paths of signals of number converter acquisition, the scattering root-mean-square value of optical signal is detected by statisticalling analyze the two-way, obtains local oscillator light
Two polarization states energy differences, feedback arrive controller, when energy differences do not meet setting range, controller is just constantly regulate
Automatically controlled Polarization Controller, so that two-way root-mean-square value is equal, until energy differences meet setting range to receive.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of light coherent receiver of automatic polarization equilibrium, which is characterized in that including the first coupler, the second coupler,
Third coupler, acousto-optic modulator, fiber amplifier, circulator, polarising beam splitter, detector, controller and automatically controlled polarization
Controller；First coupler is connect with acousto-optic modulator and automatically controlled Polarization Controller, the acousto-optic modulator with it is described
Fiber amplifier connection, the fiber amplifier are connect with the circulator；The circulator and the polarising beam splitter connect
It connects, the polarising beam splitter is also connect with second coupler；Second coupler also with the third coupler with
And the detector connection, the detector is for converting optical signals to electric signal；The third coupler with it is described automatically controlled
Polarization Controller connection；The controller is connect with the detector, and the automatically controlled Polarization Controller is connect with the controller,
The controller controls the automatically controlled Polarization Controller for analyzing optical signal.
2. the light coherent receiver of automatic polarization equilibrium according to claim 1, which is characterized in that on the circulator
It is also connected with sensor fibre；The circulator includes first port, second port and third port, the first port and institute
Fiber amplifier connection is stated, the sensor fibre connects the second port and the third port.
3. the light coherent receiver of automatic polarization equilibrium according to claim 1, which is characterized in that further include that modulus turns
Parallel operation, the analog-digital converter connects the detector and the controller, for analog electrical signal to be converted to digital telecommunication
Number.
4. the light coherent receiver of automatic polarization equilibrium according to claim 1, which is characterized in that the fiber amplifier
Device uses erbium-doped fiber amplifier.
5. a kind of light coherent reception method of automatic polarization equilibrium, which is characterized in that using as described in Claims 1 to 4 is any
Automatic polarization equilibrium light coherent receiver, execute the following steps:
Optical signal is divided by local oscillator light and transmitting light using first coupler；
By the transmitting light processing to enter second coupler after X polarization state and Y polarization state, at the same the local oscillator light is defeated
Enter second coupler, two-way detection optical signal is respectively formed after second coupler；
The detection optical signal is obtained after the automatically controlled Polarization Controller processing and receives the balanced backward light letter of polarization
Number.
6. the light coherent reception method of automatic polarization equilibrium according to claim 5, which is characterized in that described to the coupling
Specific steps of the light combination signal through the automatically controlled Polarization Controller processing include:
The scattering root-mean-square value for counting the two-way detection optical signal obtains the energy difference of the polarization state in two-way detection optical signal
Value；
The controller determines the energy differences and meets predetermined power difference range, receives the balanced optical signal of the polarization.
7. the light coherent reception method of automatic polarization equilibrium according to claim 6, which is characterized in that the controller is sentenced
Breaking to the energy differences is more than the predetermined power difference range, and the backward optical signal is inputted the automatically controlled Polarization Control
Device is to adjust polarization state.
8. the light coherent reception method of automatic polarization equilibrium according to claim 5, which is characterized in that second coupling
Device and the detector respectively include two input ports and two output ports.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811639982.3A CN109724634B (en) | 2018-12-29 | 2018-12-29 | Optical coherent receiving method with automatic polarization equalization |
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|---|---|---|---|
| CN201811639982.3A CN109724634B (en) | 2018-12-29 | 2018-12-29 | Optical coherent receiving method with automatic polarization equalization |
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| CN109724634A true CN109724634A (en) | 2019-05-07 |
| CN109724634B CN109724634B (en) | 2022-01-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114485900A (en) * | 2021-12-31 | 2022-05-13 | 武汉光谷互连科技有限公司 | Non-fading demodulation method for direct detection distributed acoustic wave sensing system |
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| CN201985866U (en) * | 2011-01-18 | 2011-09-21 | 汉鼎信息科技股份有限公司 | Frequency response equalizing device by using Brillouin processing of optical carrier wave |
| CN105737867A (en) * | 2016-03-31 | 2016-07-06 | 深圳市太阳讯传感科技有限公司 | SNR (signal to noise ratio) control device and method for optical fiber perimeter safety protection system |
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| CN1482480A (en) * | 2002-09-13 | 2004-03-17 | 华为技术有限公司 | Polarization mode dispersion compensation process and compensator thereof |
| CN101639379A (en) * | 2009-08-26 | 2010-02-03 | 南京大学 | Vibration monitoring structure and method based on optical fiber polarized light time domain reflection sense |
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| CN201985866U (en) * | 2011-01-18 | 2011-09-21 | 汉鼎信息科技股份有限公司 | Frequency response equalizing device by using Brillouin processing of optical carrier wave |
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