CN202494454U - Optoelectronic system for measuring optical fiber interference signals - Google Patents
Optoelectronic system for measuring optical fiber interference signals Download PDFInfo
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- CN202494454U CN202494454U CN2012201270165U CN201220127016U CN202494454U CN 202494454 U CN202494454 U CN 202494454U CN 2012201270165 U CN2012201270165 U CN 2012201270165U CN 201220127016 U CN201220127016 U CN 201220127016U CN 202494454 U CN202494454 U CN 202494454U
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Abstract
The utility model relates to an optoelectronic system for measuring optical fiber interference signals. The optoelectronic system for measuring the optical fiber interference signals of the utility model comprises a laser light source, two photoelectric detectors, three isolators, an optical fiber coupler and a sensing optical fiber, wherein the optical fiber coupler is a multi-port optical coupler with the number of the ports of each side being not less than two and the number of the ports of at least one side being greater than two; and the laser light source and the two photoelectric detectors are respectively connected to the same side of the optical fiber coupler through one isolator, and two ends of the sensing optical fiber are respectively connected with two ports of the other side of the optical fiber coupler to form an optical closed loop. The optoelectronic system of the utility model can assist in solving the problem of insufficient strength and instability of interference signals caused by birefringence phenomenon which randomly occurs in optical fiber in a traditional optical fiber interference system. By means of the above manner, the optoelectronic system of the utility model is advantaged in that the interference signals are stable and are not affected by environment factors.
Description
Technical field
The utility model relates to optical fiber sensing technology, is specifically related to a kind of electro-optical system of measuring optical fiber interference signal.
Background technology
The utility model is mainly based on principle of optical interference.This fiber optic interferometric system is at same optical fiber, and the light from same lasing light emitter that promptly two bundles are propagated along both forward and reverse directions in the optics closed-loop path forms interferes.When the optics closed-loop path receives external disturbance, the light path of propagating along both forward and reverse directions will be affected.Although the influence that two-way light receives is the same, the time of this influence arrival detector is different.The interference light intensity that measures on the detector will be affected, thereby cause corresponding variation response.
With traditional optical closed-loop path interference ring is example; As shown in Figure 1; The light that laser instrument sends divides clockwise and counterclockwise both direction to get into the optics closed-loop path through the 2x2 coupling mechanism, converges to detector formation interference signal again through disturbing signal induction optical fiber and 2x2 coupling mechanism.Any disturbance is applied on the optics closed-loop path, all can cause the variation Φ (t) of the phase place of propagates light, and the mistiming that this change to arrive detector is determined by position and the length of optics closed-loop path that disturbance occurs on the optics closed-loop path.Mistiming is big more, and the interference electric current that detector detects changes more greatly
I(t)＝I
0(2-2cos(ΔΦ(t)+Φ
0))， (1)
ΔΦ in the following formula (t)=Φ (t-t
1)-Φ (t-t
2),
L
1For disturbance point CW in the optics closed-loop path to the distance of 2x2 coupling mechanism, L
2For disturbance point in the optics closed-loop path counterclockwise arrives the distance of 2x2 coupling mechanism, c is the speed that light is propagated in optical fiber, I
0Detector is from a light intensity that output terminal receives of coupling mechanism, Φ when interfering for not having
0Be initial phase difference, the 2x2 coupling mechanism will bring differing of π, but the birefringence effect in the optical fiber also can have influence on Φ
0
When ΔΦ hour, being changed to of interference light intensity
ΔI(t)≈2I
0sin(Φ
0)ΔΦ(t)+I
0cos(Φ
0)(ΔΦ(t))
2 (2)
Since the characteristic of 2x2 coupling mechanism, Φ when the birefringence effect of not considering in the optical fiber
0=π, first disappearance on following formula the right, so in the optics closed-loop path fiber optic interferometric system to the response of small sample perturbations be disturbance square, rather than linear response, the difficult variation that observes interference signal.
Sensor fibre is made with single-mode fiber usually in this optics closed-loop path, and the birefringence effect in the optical fiber is that inevitably this birefringence effect will influence Φ
0Value.The birefringence effect that this specific character of optics closed-loop path interference ring makes the power of its interference signal also formed in the optical fiber of optics closed-loop path influences; Can make the rightabout light experience of the two-way different optical path in the optics closed-loop path, although after they converge again identical polarization state is arranged still.Optical fiber was twisted curvature, temperature variation, puts on the influence of the factors such as pressure on the optical fiber when birefringence effect in the optical fiber was installed.So both made identical disturbance put on two same systems, observed signal power can be not identical yet.Same system is in different time, and as by day and at night, the temperature difference makes identical disturbance also can record different strong and weak signals.Sometimes even do not observe disturbing signal.This system that will make can not reliablely and stablely work.
The problems referred to above are all unavoidable problem of all fibre systems of using principle of interferences; These factors can cause rate of failing to report and the rate of false alarm of optical fiber interference signal instability, signal to noise ratio (S/N ratio) variation, system a series of problems such as to increase.
Summary of the invention
The purpose of the utility model is to overcome the deficiency that above-mentioned prior art exists, and a kind of Photodetection system of measuring optical fiber interference signal is provided, it has, and optical fiber interference signal is strong and stable, signal to noise ratio (S/N ratio) be improved significantly advantage.
For achieving the above object; The technical scheme that the utility model adopts is: a kind of electro-optical system of measuring optical fiber interference signal; Comprise LASER Light Source, two photodetectors, three isolators, fiber coupler, sensor fibre, wherein fiber coupler is that the port number on multiple port fiber optical coupling mechanism and every limit is no less than 2 and have port number on one side at least greater than 2; LASER Light Source, two photodetectors are connected to same one side of fiber coupler respectively through 1 isolator, the two ends of sensor fibre respectively with the fiber coupler another side in two ports be connected to form the optics closed-loop path; The laser that LASER Light Source sends gets into fiber coupler through isolator; Divide clockwise and counterclockwise both direction to get into the optics closed-loop path; The process sensor fibre is got back to fiber coupler formation interference signal after experiencing disturbing signal, is received by two photodetectors through isolator respectively.
Preferably, said fiber coupler is the 3x3 fiber coupler, and splitting ratio is 1: 1: 1.
Preferably, said fiber coupler is the 3x2 fiber coupler, and splitting ratio is 1: 1: 1 and 1: 1.
Preferably, said fiber coupler is the 4x4 fiber coupler, and splitting ratio is 1: 1: 1: 1.
Preferably, said fiber coupler is the 4x2 fiber coupler, and splitting ratio is 1: 1: 1: 1 and 1: 1.
Preferably, said sensor fibre is a single-mode fiber.
The beneficial effect of the utility model is:
The problem of the swinging of signal of bringing for the birefringent phenomenon that solves in the optical fiber, the utility model has used the multiple port fiber optical coupling mechanism to match with two photodetectors and has added isolator.
Use the multiple port fiber optical coupling mechanism to replace the 2x2 coupling mechanism in the conventional solution, its objective is in order to insert two photodetectors.Because the two paths of signals of the output of multiple port fiber optical coupling mechanism has certain correlativity, therefore through detecting the correlativity of signal between two photodetectors, the stability of compensated optical fiber interference signal effectively, thus make signal to noise ratio (S/N ratio) be improved significantly.Simultaneously, after LASER Light Source and two photodetectors, all added isolator in the utility model.The light that isolator allows light that LASER Light Source sends and photodetector to receive passes through, but block light reflected back LASER Light Source, also stops the light reflected back LASER Light Source that gets into photodetector.Because the utility model has added isolator, has strengthened the coherence of light, thereby has further increased the intensity of interference signal.
Description of drawings
Fig. 1 is that illustration is implemented in the optical interference of traditional optical closed-loop path.
Fig. 2 is the electro-optical system embodiment synoptic diagram that the utility model is used for the measuring optical fiber interference signal.
Fig. 3 is traditional optical closed-loop path optical interference change in signal strength figure
Fig. 4 is the electro-optical system optical interference change in signal strength figure of the utility model.
The mark of each parts is following among accompanying drawing 1 and Fig. 2:
1, LASER Light Source; 2, fiber coupler; 3, photodetector; 4, sensor fibre; 5, isolator.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiment of the utility model is set forth in detail, thereby the protection domain of the utility model is made more explicit defining so that advantage of the utility model and characteristic can be easier to it will be appreciated by those skilled in the art that.
As shown in Figure 2, a kind of electro-optical system of measuring optical fiber interference signal, it comprises LASER Light Source 1, two photodetectors 3, three isolators 5, fiber coupler 2 and sensor fibres 4.Fiber coupler 2 in the present embodiment is the 3X3 fiber coupler.LASER Light Source 1, two photodetectors 3 are connected to same one side of fiber coupler 2 respectively through 1 isolator 5, the two ends of sensor fibre 4 respectively with fiber coupler 2 another sides in two ports be connected; Laser from LASER Light Source 1 come out after isolator 5 to fiber coupler 2, the light that is come out by fiber coupler 2 returns fiber coupler 2 through sensor fibre 4, constitutes an optics closed-loop path.During work; The laser that LASER Light Source 1 sends arrives fiber coupler 2 through isolator 5; Divide clockwise and counterclockwise both direction to get into the optics closed-loop path; Process sensor fibre 4 is got back to fiber coupler 2 formation interference signals after experiencing disturbing signal, is received by two photodetectors 3 through isolator 5 respectively.
The splitting ratio of preferred fiber coupler 2 is 1: 1: 1 in the present embodiment, and sensor fibre 4 is a single-mode fiber.Fiber coupler 2 also can by 3x2,4x4,4x2 fiber coupler or more the fiber coupler of multiport replace the light that these fiber couplers should be able to the arbitrary passage input of uniform distribution.
The problem of the swinging of signal that the electro-optical system of the measuring optical fiber interference signal of the utility model is brought for the birefringent phenomenon that solves in the optical fiber, the method that the utility model provides is to use the multiple port fiber optical coupling mechanism to match with two photodetectors and adds isolator.
Can find out that by Fig. 3 in the traditional optical closed-loop path, because the interference that birefringent phenomenon brings, the optical interference signal is suddenly big or suddenly small, the point of null value particularly occurred much approaching.
Can find out by Fig. 4; Because use multiple port fiber optical coupling mechanism matches with two photodetectors and adds isolator; In the electro-optical system of the utility model, the intensity of optical interference signal is obviously improved, and a large amount of points near null value that occur disappear basically in Fig. 3.
The above is merely the embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (6)
1. the electro-optical system of a measuring optical fiber interference signal; It is characterized in that: comprise LASER Light Source, two photodetectors, three isolators, fiber coupler, sensor fibre, wherein fiber coupler is that the port number on multiple port fiber optical coupling mechanism and every limit is no less than 2 and have port number on one side at least greater than 2; LASER Light Source, two photodetectors are connected to same one side of fiber coupler respectively through 1 isolator, the two ends of sensor fibre respectively with the fiber coupler another side in two ports be connected to form the optics closed-loop path; The laser that LASER Light Source sends gets into fiber coupler through isolator; Divide clockwise and counterclockwise both direction to get into the optics closed-loop path; The process sensor fibre is got back to fiber coupler formation interference signal after experiencing disturbing signal, is received by two photodetectors through isolator respectively.
2. the electro-optical system of measuring optical fiber interference signal according to claim 1 is characterized in that: said fiber coupler is the 3x3 fiber coupler, and its splitting ratio is 1:1:1.
3. the electro-optical system of measuring optical fiber interference signal according to claim 1 is characterized in that: said fiber coupler is the 3x2 fiber coupler, and its splitting ratio is 1:1:1 and 1:1.
4. the electro-optical system of measuring optical fiber interference signal according to claim 1 is characterized in that: said fiber coupler is the 4x4 fiber coupler, and its splitting ratio is 1:1:1:1.
5. the electro-optical system of measuring optical fiber interference signal according to claim 1 is characterized in that: said fiber coupler is the 4x2 fiber coupler, and its splitting ratio is 1:1:1:1 and 1:1.
6. according to the electro-optical system of the arbitrary described measuring optical fiber interference signal of claim 1 ~ 5, it is characterized in that: said sensor fibre is a single-mode fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201270165U CN202494454U (en) | 2012-03-30 | 2012-03-30 | Optoelectronic system for measuring optical fiber interference signals |
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|---|---|---|---|
| CN2012201270165U CN202494454U (en) | 2012-03-30 | 2012-03-30 | Optoelectronic system for measuring optical fiber interference signals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607602A (en) * | 2012-03-30 | 2012-07-25 | 苏州攀星光电科技有限公司 | Optoelectronic system for measuring optical fiber interference signal |
| CN109813534A (en) * | 2019-02-26 | 2019-05-28 | 长飞光纤光缆股份有限公司 | A kind of automatically testing platform for the test of whole coiled optical fiber optical parameter |
-
2012
- 2012-03-30 CN CN2012201270165U patent/CN202494454U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607602A (en) * | 2012-03-30 | 2012-07-25 | 苏州攀星光电科技有限公司 | Optoelectronic system for measuring optical fiber interference signal |
| CN109813534A (en) * | 2019-02-26 | 2019-05-28 | 长飞光纤光缆股份有限公司 | A kind of automatically testing platform for the test of whole coiled optical fiber optical parameter |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121017 Termination date: 20180330 |