CN117369173B - Optical signal power adjusting system based on optical isolator - Google Patents
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
Abstract
The invention relates to the technical field of optics, in particular to an optical signal power regulating system based on an optical isolator, which is characterized in that a polarizer, N coils, N corresponding direct current power supplies, N corresponding groups of optical fibers and N corresponding analyzers are arranged, and a controller is arranged to regulate the current of each direct current power supply, so that the magnetic field generated by the corresponding optical fibers is regulated, the polarization angle of an optical signal passing through the magnetic field is regulated, and the power of the optical signal passing through the polarizers is regulated, so that the optical signal with higher power is weakened for multiple times according to the polarizer, the N groups of coils, the direct current power supplies, the optical fibers and the analyzers, the weakened power is smaller each time, and the regulation precision of the polarization angle of the optical signal by the magnetic field is improved.
Description
Technical Field
The invention relates to the technical field of optics, in particular to an optical signal power regulating system based on an optical isolator.
Background
The existing optical isolator generally comprises a polarizer, a magneto-optical effect crystal optical fiber and an analyzer, wherein a coil with a direct current power supply is surrounded around the magneto-optical effect crystal optical fiber, the magnetic field intensity generated in the coil by the optical fiber is changed by changing the current in the direct current power supply, and then the polarization angle of an optical signal after passing through the magneto-optical effect crystal is changed, when an angle difference exists between the polarization angle of the optical signal after passing through the magneto-optical effect crystal and the polarization angle corresponding to the analyzer, a part of signal light can pass through the analyzer, and a part of signal light is isolated by the analyzer, so that the power of the optical signal passing through the analyzer is reduced.
Along with the rapid increase of the demand for high-power laser at present, an optical isolator is commonly used in a high-power laser, and the power of an optical signal is adjusted by adjusting the angle difference between the polarization angle of the optical signal after passing through a magneto-optical effect crystal and the polarization angle corresponding to an analyzer.
However, when the optical isolator needs to adjust the optical signal with larger power to the optical signal with smaller power, the micro change of the polarization angle of the optical signal by the magneto-optical effect crystal can cause the huge change of the optical signal power, so the polarization angle of the optical signal by the magneto-optical effect crystal needs to have fine adjustment precision, thereby bringing great challenges to the adjustment of the magnetic field intensity of the magneto-optical effect crystal. When the adjustment accuracy cannot reach the required magnetic field intensity of the magneto-optical effect crystal, the accuracy of power adjustment of the optical signal is reduced.
Therefore, how to improve the adjustment accuracy of the optical signal power in the optical isolator is a problem to be solved.
Disclosure of Invention
Aiming at the technical problems, the technical scheme adopted by the invention is an optical signal power regulating system based on an optical isolator, comprising: an optical isolator module and a control module;
the control module comprises a controller W, N coils and N direct current power supplies, and the optical isolator module comprises N groups of optical fibers and N analyzers corresponding to the Q, N coils of the polarizer;
the j output end of W is connected with the j direct current power supply Y j ，Y j The positive electrode of (a) is connected with the j-th coil X j Y is the input terminal of (2) j Negative electrode connection X of (2) j Output terminal of X j Around the j-th group of optical fibers G j Wherein W is used for adjusting the optical signal H according to the to-be-adjusted 1 And the adjusted optical signal H 2 Adjusting Y by optical power of (C) j Is the current f of (2) j ，Y j For according to f j Regulation X j Strength of magnetic field B generated j ，X j For according to B j Regulation G j The polarization angle of the output optical signal;
the input end of Q is used for inputting H 1 The output end of Q is connected with a first group of optical fibers G 1 I-th group of optical fibers G i The output end of (1) is connected with an ith analyzer J i Input terminal, J i The output end of (1) is connected with the optical fiber G of the (i+1) th group i+1 N-th group of optical fibers G N Is the input of (2)The output end is connected with the Nth analyzer J N Input terminal, J N For outputting H 2 Where j=1, 2, … …, N, i=1, 2, … …, N-1.
Compared with the prior art, the optical isolator adjusting system provided by the invention has obvious beneficial effects, can achieve quite technical progress and practicality, has wide industrial application value, and has at least the following beneficial effects: according to the embodiment, the Q, N coils of the polarizer, the N corresponding direct current power supplies, the N corresponding groups of optical fibers and the N corresponding analyzers are arranged, the controller W is arranged to adjust the current of each direct current power supply, and then the magnetic field generated by the corresponding optical fibers is adjusted, so that the polarization angle of an optical signal output by the magnetic field is adjusted, the power of the optical signal after passing through the polarizers is further adjusted, the optical signal with larger power is weakened for multiple times according to the polarizer Q, the N groups of coils, the direct current power supplies, the optical fibers and the analyzers, the weakened power is smaller each time, and the adjustment precision of the polarization angle of the optical signal by the magnetic field is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an optical signal power adjustment system based on an optical isolator according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
An optical signal power adjustment system based on an optical isolator is provided in a first embodiment, including: an optical isolator module and a control module;
the control module comprises a controller W, N coils and N direct current power supplies, and the optical isolator module comprises N groups of optical fibers and N analyzers corresponding to the Q, N coils of the polarizer;
the j output end of W is connected with the j direct current power supply Y j ，Y j The positive electrode of (a) is connected with the j-th coil X j Y is the input terminal of (2) j Negative electrode connection X of (2) j Output terminal of X j Around the j-th group of optical fibers G j Wherein W is used for adjusting the optical signal H according to the to-be-adjusted 1 And the adjusted optical signal H 2 Adjusting Y by optical power of (C) j Is the current f of (2) j ，Y j For according to f j Regulation X j Strength of magnetic field B generated j ，X j For according to B j Regulation G j The polarization angle of the output optical signal;
the input end of Q is used for inputting the optical signal H to be regulated 1 The output end of Q is connected with a first group of optical fibers G 1 I-th group of optical fibers G i The output end of (1) is connected with an ith analyzer J i Input terminal, J i Is connected with the output end of (1)i+1 group optical fiber G i+1 N-th group of optical fibers G N The output end of (2) is connected with an Nth analyzer J N Input terminal, J N For outputting the conditioned optical signal H 2 Where j=1, 2, … …, N, i=1, 2, … …, N-1.
When the optical isolator needs to adjust the optical signal with larger power to the optical signal with smaller power, the tiny change of the polarization angle of the optical signal caused by the magnetic field can cause the huge change of the power of the optical signal, and the polarization angle of the optical signal needs to have fine adjustment precision.
Therefore, in this embodiment, the polarizer Q, N coils, the corresponding N dc power supplies, the corresponding N groups of optical fibers, and the corresponding N analyzers are provided, and the controller W is provided to adjust the current of each dc power supply, and further adjust the magnitude of the magnetic field generated by the corresponding optical fibers, so as to adjust the polarization angle of the optical signal output by the magnetic field, and further adjust the power of the optical signal after passing through the polarizers, so as to weaken the optical signal with higher power multiple times according to the polarizer Q and the N groups of coils, the dc power supplies, the optical fibers, and the analyzers, so that the weakened power is smaller each time, and the adjustment accuracy of the polarization angle of the optical signal by the magnetic field is improved.
Specifically, the optical signal H to be conditioned 1 Input to polarisers Q, H 1 Upon passing through Q, an initial polarized light P having a polarization direction corresponding to Q is obtained 0 。
The output end of Q will be P 0 Input to the first group of optical fibers G 1 In the first coil X 1 At the first DC power supply Y 1 Generates coil current under regulation of G 1 At the first coil X 1 Generates a magnetic field under the action of the coil current and changes P according to the intensity of the magnetic field 0 Further couple G to 1 The optical signal output from the first analyzer J 1 In accordance with G 1 Polarization direction of optical signal output from (a) and (J) 1 Corresponding polarization direction, control G 1 Part of the optical signals pass through and part of the optical signals are isolated to complete the separation of H 1 Is a first attenuation of the optical power of (a).
Then, the (i-1) th analyzer J i-1 Is input to the ith group of optical fibers G i In the ith coil X i In the ith DC power supply Y i Generates coil current under control of G i In the ith coil X i Generates a magnetic field under the action of the coil current and changes G according to the intensity of the magnetic field i Polarization direction of the medium optical signal, further to G i The optical signal output from the first stage is input to the ith analyzer J i In accordance with G i Polarization direction of optical signal output from (a) and (J) i Corresponding polarization direction, control G i Part of the optical signals pass through and part of the optical signals are isolated to complete the separation of H 1 The ith attenuation of the optical power up to J N Outputting the regulated optical signal H 2 Finish the H 1 Is provided for the adjustment of the optical power of the optical fiber.
In a specific embodiment, n=2 is set, as shown in fig. 1, which is a schematic diagram of an optical signal power adjustment system based on an optical isolator according to an embodiment of the present invention, where an arrow in fig. 1 indicates a transmission direction of an optical signal between optical elements. The embodiment comprises an optical isolator module and a control module, wherein the control module comprises a controller W, a first coil X 1 Second coil X 2 First direct current power supply Y 1 And a second DC power supply Y 2 The optical isolator module comprises a polarizer Q, a first group of optical fibers G 1 Second group of optical fibers G 2 First analyzer J 1 And a second analyzer J 2 。
Wherein the first output end of W is connected with Y 1 The second output end of W is connected with Y 2 And is used for adjusting the optical signal H according to the to-be-adjusted 1 And the adjusted optical signal H 2 Adjusting Y by optical power of (C) 1 Is the current f of (2) 1 And Y 2 Is the current f of (2) 2 。
Y 1 Positive electrode connection X of (2) 1 Y is the input terminal of (2) 1 Negative electrode connection X of (2) 1 And is used for the output end according to f 1 Regulation X 1 The resulting magnetic fieldField strength, X 1 Surround G 1 And is used in accordance with B 1 Regulation G 1 The polarization angle of the output optical signal; y is Y 2 Positive electrode connection X of (2) 2 Y is the input terminal of (2) 2 Negative electrode connection X of (2) 2 And is used for the output end according to f 2 Regulation X 2 The strength of the magnetic field produced, X 2 Surround G 2 And is used in accordance with B 2 Regulation G 2 The polarization angle of the output optical signal.
The input end of Q is used for inputting H 1 The output end of Q is connected with G 1 Input terminal G of (1) 1 Output terminal of (1) is connected with J 1 Input terminal, J 1 Output terminal of (2) is connected with G 2 Input terminal G of (1) 2 Output terminal of (1) is connected with J 2 Input terminal, J 2 For outputting H 2 。
In one embodiment, G 1 Comprises a first single-mode optical fiber g 1 1 First magneto-optical effect crystal fiber g 2 1 And a first and a second single mode optical fibers g 3 1 Wherein g 1 1 Is connected with the output end of Q, g 1 1 Is connected with the second end g of (a) 2 1 G at the first end of (1) 2 1 Is connected with the second end g of (a) 3 1 G at the first end of (1) 3 1 Is connected with J at the second end of 1 Is provided.
Wherein X is 1 Around the first group of optical fibres G 1 According to X 1 And g 2 1 Generating a magnetic field to pass G 1 The polarization angle of the optical signal of (a) is correspondingly deflected. g 1 1 And g 3 1 Is arranged at g 2 1 Two ends of the optical fiber are convenient for magneto-optical effect crystal optical fiber, polarizer Q and first analyzer J 1 And (5) performing connection.
In one embodiment, G i+1 Comprises the (i+1) th first single-mode optical fiber g 1 i+1 I+1th magneto-optical effect crystal optical fiber g 2 i+1 And the (i+1) th second single-mode optical fiber g 3 i+1 Wherein g 1 i+1 Is connected with J at the first end of i Output end g of (2) 1 i+1 Is connected with the second end g of (a) 2 i+1 G at the first end of (1) 2 i+1 Is connected with the second end g of (a) 3 i+1 G at the first end of (1) 3 i+1 Second end connection J i+1 Is provided.
Wherein X is i+1 Around the (i+1) th group of optical fibers G i+1 According to X i+1 And g 2 i+1 Generating a magnetic field to pass G i+1 The polarization angle of the optical signal of (a) is correspondingly deflected. g 1 i+1 And g 3 i+1 Is arranged at g 2 i+1 Two ends of the optical fiber are convenient for magneto-optical effect crystal optical fiber and the ith analyzer J i And (i+1) th analyzer J i+1 And (5) performing connection.
In one embodiment, the system further comprises a processor and a memory storing a computer program, the memory further storing the initial polarized light P of Q output 0 Corresponding original optical power intensity I 1 Target optical power intensity I 2 Original polarization angle set theta of optical signals output by optical fibers of preset lookup table C, N group among current magnitude of direct current power supply and polarization angles of optical signals output by optical fibers 0 G ={θ 0 G1 ，θ 0 G2 ，……，θ 0 Gj ，……，θ 0 GN Polarization angle set theta corresponding to polarization analyzer J ={θ J1 ，θ J2 ，……，θ Jj ，……，θ JN And }, where θ 0 Gj Refers to G j Original polarization angle of output optical signal, θ Jj Refers to J j A corresponding polarization angle;
when the computer program is executed by a processor, the following steps are implemented:
s1, according to I 1 And I 2 The number of times S= [ N×e ] (-I) of light power attenuation is obtained 2 /I 1 )]Wherein, the method comprises the steps of, wherein,to get roundA function;
s2, according to I 1 、I 2 S, obtaining the average angle difference theta p =arccos((I 2 /I 1 /S) 1/2 ) Wherein θ p Refers to G k Polarization angle and J of the output optical signal k The difference between the polarization angles of the output optical signals, k=1, 2, … …, S;
s3, according to θ J And theta p Acquiring a candidate polarization angle set theta of optical signals output by the front S group of optical fibers 1 G ={θ 1 G1 ，θ 1 G2 ，……，θ 1 Gk ，……，θ 1 GS The k group of optical fibers G k Candidate polarization angle θ of the output optical signal 1 Gk ={θ 1 Gk1 ，θ 1 Gk2 And }, where θ 1 Gk1 =θ Jk -θ p ，θ 1 Gk2 =θ Jk +θ p ，θ Jk Refers to J k A corresponding polarization angle;
s4, according to θ 0 G And theta 1 G Acquiring a target polarization angle set theta of optical signals output by the front S group of optical fibers 21 G ={θ 2 G1 ，θ 2 G2 ，……，θ 2 Gk ，……，θ 2 GS }，G k For input to G k Target polarization angle θ of the output optical signal 2 Gk The following conditions are satisfied:
if |theta 0 Gk -θ 1 Gk1 |≤|θ 0 Gk -θ 1 Gk2 I, get θ 2 Gk =θ 1 Gk1 ；
If |theta 0 Gk -θ 1 Gk1 |＞|θ 0 Gk -θ 1 Gk2 I, get θ 2 Gk =θ 1 Gk2 ；
S5, according to θ J Obtain the outputs of the S+1 group to the N group of optical fibersTarget polarization angle set θ for optical signals 22 G ={θ 2 G(S+1) ，θ 2 G(S+2) ，……，θ 2 G(S+e) ，……，θ 2 GN (S+e group optical fiber G) S+e Target polarization angle θ of the output optical signal 2 G(S+e) =θ J(S+e) ，θ J(S+e) Refers to J S+e Corresponding polarization angles e=1, 2, … …, N-S;
s6, according to θ 21 G And theta 22 G C is queried to obtain currents F= { F corresponding to N direct current power supplies 1 ，f 2 ，……，f j ，……，f N }, wherein Y j Is the current f of (2) j By looking up θ in C 2 Gj The corresponding current magnitude is obtained.
The embodiment sets N groups of coils, a direct current power supply, an optical fiber and an analyzer to weaken the optical signal with larger power for multiple times, and when the optical power intensity I is the target optical power intensity I 2 Initial polarized light P output with Q 0 Is the original optical power intensity I of (1) 1 With a small gap between them, a small number of coils, DC power supplies, optical fibers, analyzers are used to polarize the initial polarized light P 0 Weakening can be performed on P 0 Performing higher-precision adjustment; when I 2 And I 1 When the gap between the two is large, more groups of coils, direct current power supplies, optical fibers and analyzers are needed to be used for the initial polarized light P 0 Weakening is performed to P 0 And higher-precision adjustment is performed.
Thus, the present embodiment first of all depends on I 1 And I 2 The number of times S of weakening the optical power is obtained to be = [ N multiplied by e (-I) 2 /I 1 )]I.e. to the initial polarized light P according to the former S groups of coils, DC power supply, optical fiber, and analyzer 0 The power reduction is performed S times.
Then according to I 1 、I 2 And S obtains the average angle difference theta p =arccos((I 2 /I 1 /S) 1/2 ) To characterize G k Polarization angle and J of the output optical signal k The optical signal outputtedThe difference between the polarization angles, thereby combining J k Polarization angle θ of the output optical signal Jk Obtaining the kth group of optical fibers G k Candidate polarization angle θ of the output optical signal 1 Gk ={θ 1 Gk1 ，θ 1 Gk2 }. Wherein θ 1 Gk1 And theta 1 Gk2 Expressed in theta Jk As the reference and theta Jk Angle difference theta of (2) p Is the first candidate angle theta 1 Gk1 =θ Jk -θ p And a second candidate angle theta 1 Gk2 =θ Jk +θ p 。
Then, according to input H 1 Time kth group of optical fibers G k Original polarization angle θ of the output optical signal 0 Gk Calculate |theta 0 Gk -θ 1 Gk1 Comparing the k-th group of fibers G k The polarization angle of the output optical signal is represented by theta 0 Gk Adjusted to theta 1 Gk1 The degree of adjustment required and the calculation of |θ 0 Gk -θ 1 Gk2 Comparing the k-th group of fibers G k The polarization angle of the output optical signal is represented by theta 0 Gk Adjusted to theta 1 Gk2 The degree of adjustment required to determine the candidate angle in which the degree of adjustment is the smallest as G k For input to G k Target polarization angle θ of the output optical signal 2 Gk 。
Since the S+1st to N th coils, DC power supply, optical fiber, and analyzer do not contribute to the initial polarized light P 0 Power attenuation is performed, and thus, group s+e optical fiber G S+e Target polarization angle θ of the output optical signal 2 G(S+e) =θ J(S+e) Then can be obtained by looking up θ in C 2 Gj The corresponding current magnitude is Y j Is the current f of (2) j Further obtaining currents F= { F corresponding to the N direct current power supplies 1 ，f 2 ，……，f j ，……，f N The controller W can adjust the current corresponding to the N direct current power supplies according to F, and the adjustment is completed under the condition of ensuring the adjustment precisionFor H 1 Power regulation of (2) to improve H 1 Is used for adjusting the power of the power supply.
The embodiment firstly adopts I 1 And I 2 Acquiring the number of times of weakening the optical power and the average angle difference theta p And combines the original polarization angle set theta of the optical signals output by the N groups of optical fibers 0 G Polarization angle set theta corresponding to analyzer J The candidate polarization angles of the optical signals output by the former S groups and the target polarization angles of the optical signals output by the N groups of optical fibers are obtained, the accuracy of the target polarization angles of the optical signals output by the N groups of optical fibers is improved, currents F corresponding to N direct current power supplies are further inquired and obtained in C, support is provided for the controller W to adjust the currents corresponding to the N direct current power supplies according to the F, and H is completed under the condition of guaranteeing adjustment accuracy 1 Power regulation of (2) to improve H 1 Is used for adjusting the power of the power supply.
In a specific embodiment, the computer program when executed by the processor further performs the steps of:
s7, regulating Y according to W j The current of (2) is f j ；
S8, H 1 Input to Q, obtain initial polarized light P 0 ；
S9, P 0 Input to G 1 Obtaining a first polarized light P 11 ；
S10, P 11 Input to J 1 Obtaining first and second polarized light P 12 ；
S11, the ith second polarized light P i2 Input to G i+1 Obtain the (i+1) th first polarized light P (i+1)1 ；
S12, P (i+1)1 Input to the (i+1) th analyzer J i+1 Obtain the (i+1) th second polarized light P (i+1)2 ；
S13, from J N The output end of (1) acquires H 2 。
Wherein the optical signal H to be conditioned 1 Input to polarisers Q, H 1 When passing through Q, the polarization direction corresponding to Q is consistentIs of the initial polarization P of (2) 0 . Then P is added 0 Input to G 1 In combination with the first coil X 1 And a first DC power supply Y 1 P pair P 0 Is deflected to obtain a first polarized light P 11 Then P is taken up 11 Input to J 1 Binding P 11 Polarization angle and J of (2) 1 Corresponding polarization angle pair P 11 Filtering to obtain first and second polarized light P 12 And so on, up to N The output end of (1) acquires H 2 。
In one embodiment, I 1 ＞I 2 。
Wherein when there is an angle difference between the polarization angle of the optical signal and the polarization angle of the analyzer, a part of the signal light can pass through the analyzer, and a part of the signal light is isolated by the analyzer, so that the power of the optical signal passing through the analyzer is reduced, thus I 1 ＞I 2 。
In one embodiment, I k2 =I k1 ×(cosθ p ) 2, wherein I k1 Refers to the kth first polarized light P k1 Optical power intensity, I k2 Refers to the kth second polarized light P k2 Is provided.
Wherein θ p Characterization G k The kth first polarized light P of the output k1 Polarization angle and J of (2) k Output kth second polarized light P k2 The difference between the polarization angles of (2), thus, P k1 Optical power intensity I of (2) k1 And P k2 Optical power intensity I of (2) k2 The relation between them is I k2 =I k1 ×(cosθ p )^2。
Due to group S+e optical fiber G S+e Target polarization angle θ of the output optical signal 2 G(S+e) And J S+e Corresponding polarization angle theta J(S+e) Equal, then G S+e Output S+e th first polarized light P (S+e)1 Polarization angle and J of (2) S+e Output S+e second polarized light P (S+e)2 And therefore P (S+e)1 Is of (1)Rate intensity I (S+e)1 And P (S+e)2 Optical power intensity I of (2) (S+e)2 The relation between them is I (S+e)2 =I (S+e)1 . In one embodiment, H 2 Optical power intensity and I of (2) 2 Equal.
According to the embodiment, the Q, N coils of the polarizer, the N corresponding direct current power supplies, the N corresponding groups of optical fibers and the N corresponding analyzers are arranged, the controller W is arranged to adjust the current of each direct current power supply, and then the magnetic field generated by the corresponding optical fibers is adjusted, so that the polarization angle of an optical signal output by the magnetic field is adjusted, the power of the optical signal after passing through the polarizers is further adjusted, the optical signal with larger power is weakened for multiple times according to the polarizer Q, the N groups of coils, the direct current power supplies, the optical fibers and the analyzers, the weakened power is smaller each time, and the adjustment precision of the polarization angle of the optical signal by the magnetic field is improved.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. Those skilled in the art will also appreciate that many modifications may be made to the embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (7)
1. An optical isolator-based optical signal power conditioning system, the system comprising: an optical isolator module and a control module;
the control module comprises a controller W, N coils and N direct current power supplies, and the optical isolator module comprises N groups of optical fibers and N analyzers corresponding to the Q, N coils of the polarizer;
the j output end of W is connected with the j direct current power supply Y j ，Y j The positive electrode of (a) is connected with the j-th coil X j Y is the input terminal of (2) j Negative electrode connection X of (2) j Output terminal of X j Around the j-th group of optical fibers G j Wherein W is used for the initial polarized light P output according to Q 0 Is the original optical power intensity I of (1) 1 And a target optical powerIntensity I 2 The obtained number of times of weakening S of the optical power and average angle difference theta p Combining the original polarization angle set of the optical signals output by the N groups of optical fibers and the polarization angle sets corresponding to the N analyzers to adjust Y j Is the current f of (2) j ，Y j For according to f j Regulation X j Strength of magnetic field B generated j ，X j For according to B j Regulation G j The polarization angle of the output optical signals is such that the front S group of coils, the corresponding direct current power supply, the corresponding optical fiber and the corresponding analyzer are opposite to the initial polarized light P 0 S times of power attenuation are carried out, and the S+1 th to N th groups of coils, the corresponding direct current power supplies, the corresponding optical fibers and the corresponding analyzers do not conduct the primary polarized light P 0 Performing power attenuation;
the input end of Q is used for inputting H 1 The output end of Q is connected with a first group of optical fibers G 1 I-th group of optical fibers G i The output end of (1) is connected with an ith analyzer J i Input terminal, J i The output end of (1) is connected with the optical fiber G of the (i+1) th group i+1 N-th group of optical fibers G N The output end of (2) is connected with an Nth analyzer J N Input terminal, J N For outputting the target optical power intensity I 2 Corresponding adjusted optical signal H 2 Where j=1, 2, … …, N, i=1, 2, … …, N-1.
2. The system of claim 1, wherein G 1 Comprises a first single-mode optical fiber g 1 1 First magneto-optical effect crystal fiber g 2 1 And a first and a second single mode optical fibers g 3 1 Wherein g 1 1 Is connected with the output end of Q, g 1 1 Is connected with the second end g of (a) 2 1 G at the first end of (1) 2 1 Is connected with the second end g of (a) 3 1 G at the first end of (1) 3 1 Is connected with J at the second end of 1 Is provided.
3. A system according to claim 1 or 2, characterized in thatIn that G i+1 Comprises the (i+1) th first single-mode optical fiber g 1 i+1 I+1th magneto-optical effect crystal optical fiber g 2 i+1 And the (i+1) th second single-mode optical fiber g 3 i+1 Wherein g 1 i+1 Is connected with J at the first end of i Output end g of (2) 1 i+1 Is connected with the second end g of (a) 2 i+1 G at the first end of (1) 2 i+1 Is connected with the second end g of (a) 3 i+1 G at the first end of (1) 3 i+1 Second end connection J i+1 Is provided.
4. The system of claim 1 further comprising a processor and a memory storing a computer program, said memory further storing an initial polarization of the Q output P 0 Corresponding original optical power intensity I 1 Target optical power intensity I 2 Original polarization angle set theta of optical signals output by optical fibers of preset lookup table C, N group among current magnitude of direct current power supply and polarization angles of optical signals output by optical fibers 0 G ={θ 0 G1 ，θ 0 G2 ，……，θ 0 Gj ，……，θ 0 GN Polarization angle set theta corresponding to polarization analyzer J ={θ J1 ，θ J2 ，……，θ Jj ，……，θ JN And }, where θ 0 Gj Refers to G j Original polarization angle of output optical signal, θ Jj Refers to J j A corresponding polarization angle;
when the computer program is executed by a processor, the following steps are implemented:
s1, according to I 1 And I 2 The number of times S= [ N×e ] (-I) of light power attenuation is obtained 2 /I 1 )]Wherein [ the]Is a rounding function;
s2, according to I 1 、I 2 S, obtaining the average angle difference theta p =arccos((I 2 /I 1 /S) 1/2 ) Wherein θ p Refers to G k Polarization of the output optical signalAngle and J k The difference between the polarization angles of the output optical signals, k=1, 2, … …, S;
s3, according to θ J And theta p Acquiring a candidate polarization angle set theta of optical signals output by the front S group of optical fibers 1 G ={θ 1 G1 ，θ 1 G2 ，……，θ 1 Gk ，……，θ 1 GS The k group of optical fibers G k Candidate polarization angle θ of the output optical signal 1 Gk ={θ 1 Gk1 ，θ 1 Gk2 And }, where θ 1 Gk1 =θ Jk -θ p ，θ 1 Gk2 =θ Jk +θ p ，θ Jk Refers to J k A corresponding polarization angle;
s4, according to θ 0 G And theta 1 G Acquiring a target polarization angle set theta of optical signals output by the front S group of optical fibers 21 G ={θ 2 G1 ，θ 2 G2 ，……，θ 2 Gk ，……，θ 2 GS }，G k Target polarization angle θ of the output optical signal 2 Gk The following conditions are satisfied:
if |theta 0 Gk -θ 1 Gk1 |≤|θ 0 Gk -θ 1 Gk2 I, get θ 2 Gk =θ 1 Gk1 ；
If |theta 0 Gk -θ 1 Gk1 |＞|θ 0 Gk -θ 1 Gk2 I, get θ 2 Gk =θ 1 Gk2 ；
S5, according to θ J Acquiring a target polarization angle set theta of optical signals output by the S+1-N group of optical fibers 22 G ={θ 2 G(S+1) ，θ 2 G(S+2) ，……，θ 2 G(S+e) ，……，θ 2 GN (S+e group optical fiber G) S+e Target polarization angle of output optical signalθ 2 G(S+e) =θ J(S+e) ，θ J(S+e) Refers to J S+e Corresponding polarization angles e=1, 2, … …, N-S;
s6, according to θ 21 G And theta 22 G C is queried to obtain currents F= { F corresponding to N direct current power supplies 1 ，f 2 ，……，f j ，……，f N }, wherein Y j Is the current f of (2) j By looking up θ in C 2 Gj The corresponding current magnitude is obtained.
5. The system of claim 4, wherein the computer program when executed by the processor further performs the steps of:
s7, regulating Y according to W j The current of (2) is f j ；
S8, H 1 Input to Q, obtain initial polarized light P 0 ；
S9, P 0 Input to G 1 Obtaining a first polarized light P 11 ；
S10, P 11 Input to J 1 Obtaining first and second polarized light P 12 ；
S11, the ith second polarized light P i2 Input to G i+1 Obtain the (i+1) th first polarized light P (i+1)1 ；
S12, P (i+1)1 Input to the (i+1) th analyzer J i+1 Obtain the (i+1) th second polarized light P (i+1)2 ；
S13, from J N The output end of (1) acquires H 2 。
6. The system of claim 4, wherein I 1 ＞I 2 。
7. The system of claim 5, wherein I k2 =I k1 ×(cosθ p ) 2, wherein I k1 Refers to the kth first polarized light P k1 Is strong in optical powerDegree, I k2 Refers to the kth second polarized light P k2 Is provided.
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Citations (4)
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| CN1160212A (en) * | 1996-03-01 | 1997-09-24 | 富士通株式会社 | Variable optical attenuator which applies magnetic field to faraday element to rotate polarization of light signal |
| JP2007114746A (en) * | 2005-09-21 | 2007-05-10 | Fdk Corp | Faraday rotational angle varying device and variable optical attenuator using same |
| US9423635B1 (en) * | 2014-01-31 | 2016-08-23 | The University Of Toledo | Integrated magneto-optic modulator/compensator system, methods of making, and methods of using the same |
| CN113625477A (en) * | 2020-05-09 | 2021-11-09 | 中天科技光纤有限公司 | Optical isolator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1160212A (en) * | 1996-03-01 | 1997-09-24 | 富士通株式会社 | Variable optical attenuator which applies magnetic field to faraday element to rotate polarization of light signal |
| JP2007114746A (en) * | 2005-09-21 | 2007-05-10 | Fdk Corp | Faraday rotational angle varying device and variable optical attenuator using same |
| US9423635B1 (en) * | 2014-01-31 | 2016-08-23 | The University Of Toledo | Integrated magneto-optic modulator/compensator system, methods of making, and methods of using the same |
| CN113625477A (en) * | 2020-05-09 | 2021-11-09 | 中天科技光纤有限公司 | Optical isolator |
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