CN104991394A - Mach-Zehnder optical fiber interferometer stable control system - Google Patents
Mach-Zehnder optical fiber interferometer stable control system Download PDFInfo
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- CN104991394A CN104991394A CN201510349839.0A CN201510349839A CN104991394A CN 104991394 A CN104991394 A CN 104991394A CN 201510349839 A CN201510349839 A CN 201510349839A CN 104991394 A CN104991394 A CN 104991394A
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- mach
- fibre optic
- optical fiber
- optic interferometer
- zehnder
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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
- G02F1/21—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 by interference
- G02F1/225—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 by interference in an optical waveguide structure
- G02F1/2252—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 by interference in an optical waveguide structure in optical fibres
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a Mach-Zehnder optical fiber interferometer stable control system comprising a Mach-Zehnder optical fiber interferometer, an optical fiber coupler, a photoelectric detector, a bias control circuit and a phase modulator. An input end of the optical fiber coupler is connected with the Mach-Zehnder optical fiber interferometer; an output end of the optical fiber coupler is connected with an input end of the photoelectric detector; an output end of the photoelectric detector is in a connection with an input end of the bias control circuit; an output end of the bias control circuit is in a connection with an input end of the phase modulator; and the phase modulator is arranged on one arm of the Mach-Zehnder optical fiber interferometer. The Mach-Zehnder optical fiber interferometer stable control system is simply structured; and the Mach-Zehnder optical fiber interferometer is formed by a polarization maintaining fiber coupler and an optical fiber delay line to overcome unstable work of the present Mach-Zehnder optical fiber interferometer.
Description
Technical field
The invention discloses a kind of Mach-Zehnder fibre optic interferometer stabilizing control system, relate to technical field.
Background technology
Mach-Zehnder fibre optic interferometer (MZI) is the instrument utilizing interference of light principle to make, and has that volume is little, lightweight, compact conformation, good insulating, electromagnetism interference and a sensitivity advantages of higher, day by day comes into one's own.Mach-Zehnder fibre optic interferometer has been widely used in the full-fiber sensor measuring system of pressure magnetic field, refractive index, microseismic activity, micrometric displacement, laser phase noise, frequency noise etc., and light carries the optical fiber telecommunications system of millimeter wave, microwave.Mach-Zehnder fibre optic interferometer is the important devices realizing the conversion of phase-modulation optical link phase-magnitude, and its performance is the prerequisite ensureing whole optical link steady operation.
Mach-Zehnder fibre optic interferometer is a kind of non-equilibrium parallel organization, is subject to the impact of environmental factor, finally shows as the instability of light signal polarization state and phase place.For high performance measuring system and optical fiber telecommunications system, strict requirement is proposed to the steady operation of fibre optic interferometer.
From Light Wave Guide Theory, vacuum wavelength is λ
0light is the optical fiber of L by length, exports the phase place change of light
for:
Wherein, n is optical fiber effective refractive index,
for light propagation constant in a vacuum.The change of fiber optic temperature T can affect optical fibre refractivity n and length L, and in optical fiber, the change d φ of light phase can be expressed from the next:
As can be seen from the above equation, fiber phase change is subject to the impact of optical fiber geometrical length and optical fibre refractivity change.Mach-Zehnder fibre optic interferometer device is very responsive to the change of environment, only takes the stable of certain feedback control loop guarantee performance.
Summary of the invention
Technical matters to be solved by this invention is: for the defect of prior art, provides a kind of Mach-Zehnder fibre optic interferometer stabilizing control system, ensures that Mach-Zehnder fibre optic interferometer is stable and exports.Overcoming existing Mach-Zehnder fibre optic interferometer can not the problem of steady operation by ambient vibration.
A kind of Mach-Zehnder fibre optic interferometer stabilizing control system, comprises Mach-Zehnder fibre optic interferometer, also comprises fiber coupler, photodetector, bias control circuit and phase-modulator, wherein,
The input end of described fiber coupler is connected with Mach-Zehnder fibre optic interferometer, the fine output terminal of coupling mechanism is connected with the input end of photodetector, the output terminal of photodetector is connected with the input end of bias control circuit, the output terminal of bias control circuit is connected with the input end of phase-modulator, and described phase-modulator is arranged on an arm of Mach-Zehnder fibre optic interferometer;
The output terminal of described Mach-Zehnder fibre optic interferometer is via fiber coupler light signal fed back, corresponding voltage signal is exported by photodetector, described voltage signal changes into the output signal of control system successively through bias control circuit, described output signal is sent to phase-modulator.
As present invention further optimization scheme, in described Mach-Zehnder fibre optic interferometer, the connection of fiber port uses FC/APC flange head.
As present invention further optimization scheme, in described Mach-Zehnder fibre optic interferometer, optical fiber is the polarization maintaining optical fibre of slow axis alignment.
As present invention further optimization scheme, the splitting ratio of described fiber coupler is 90:10.
The present invention adopts above technical scheme compared with prior art, there is following technique effect: the present invention realizes simply, utilize polarization-maintaining fiber coupler to add fibre delay line and construct tunable Mach-Zehnder fibre optic interferometer, overcoming existing Mach-Zehnder fibre optic interferometer can not the problem of steady operation.
Accompanying drawing explanation
Fig. 1 is system construction drawing of the present invention.
Embodiment
Be described below in detail embodiments of the present invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, Mach-Zehnder fibre optic interferometer stabilizing control system, comprises the fiber coupler that a splitting ratio is 90:10, photodetector, a bias control circuit and a phase-modulator to system construction drawing of the present invention.The input end of fiber coupler is connected with Mach-Zehnder fibre optic interferometer, the output terminal of fiber coupler is connected with the input end of photodetector, the output terminal of photodetector is connected with bias control circuit input end, and bias control circuit output terminal is the input end of the phase-modulator on Mach-Zehnder fibre optic interferometer one arm.Preferably, the connection of fiber port uses FC/APC flange head.Optical fiber is the polarization maintaining optical fibre of slow axis alignment.The light signal of the fiber coupler feedback 10% of a splitting ratio 90:10 is utilized at Mach-Zehnder fibre optic interferometer output terminal, corresponding voltage signal is exported by photodetector, this signal is as the input signal of control system, and the output signal of control system directly controls the phase-modulator of fibre optic interferometer one arm.
By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from present inventive concept.The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to technical spirit of the present invention, within the spirit and principles in the present invention, to any simple amendment that above embodiment is done, equivalent replacement and improvement etc., within the protection domain all still belonging to technical solution of the present invention.
Claims (4)
1. a Mach-Zehnder fibre optic interferometer stabilizing control system, comprises Mach-Zehnder fibre optic interferometer, it is characterized in that: also comprise fiber coupler, photodetector, bias control circuit and phase-modulator, wherein,
The input end of described fiber coupler is connected with Mach-Zehnder fibre optic interferometer, the fine output terminal of coupling mechanism is connected with the input end of photodetector, the output terminal of photodetector is connected with the input end of bias control circuit, the output terminal of bias control circuit is connected with the input end of phase-modulator, and described phase-modulator is arranged on an arm of Mach-Zehnder fibre optic interferometer;
The output terminal of described Mach-Zehnder fibre optic interferometer is via fiber coupler light signal fed back, corresponding voltage signal is exported by photodetector, described voltage signal changes into the output signal of control system successively through bias control circuit, described output signal is sent to phase-modulator.
2. a kind of Mach-Zehnder fibre optic interferometer stabilizing control system as claimed in claim 1, is characterized in that: in described Mach-Zehnder fibre optic interferometer, and the connection of fiber port uses FC/APC flange head.
3. a kind of Mach-Zehnder fibre optic interferometer stabilizing control system as claimed in claim 1 or 2, is characterized in that: in described Mach-Zehnder fibre optic interferometer, and optical fiber is the polarization maintaining optical fibre of slow axis alignment.
4. a kind of Mach-Zehnder fibre optic interferometer stabilizing control system as claimed in claim 1 or 2, is characterized in that: the splitting ratio of described fiber coupler is 90:10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510349839.0A CN104991394A (en) | 2015-06-23 | 2015-06-23 | Mach-Zehnder optical fiber interferometer stable control system |
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| CN201510349839.0A CN104991394A (en) | 2015-06-23 | 2015-06-23 | Mach-Zehnder optical fiber interferometer stable control system |
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| CN201510349839.0A Pending CN104991394A (en) | 2015-06-23 | 2015-06-23 | Mach-Zehnder optical fiber interferometer stable control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749420A (en) * | 2019-09-12 | 2020-02-04 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN111211844A (en) * | 2020-04-20 | 2020-05-29 | 北京中创为南京量子通信技术有限公司 | Quantum key receiving chip and device |
Citations (6)
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| JPH05323245A (en) * | 1992-05-18 | 1993-12-07 | Nec Corp | Control system for optical modulation |
| JPH10246874A (en) * | 1997-03-04 | 1998-09-14 | Nippon Telegr & Teleph Corp <Ntt> | Optical modulator control circuit |
| EP1168038A2 (en) * | 2000-06-30 | 2002-01-02 | Mitsubishi Denki Kabushiki Kaisha | Optical frequency doubling device and bias control method for such a device |
| US6469817B1 (en) * | 1999-06-18 | 2002-10-22 | Trw Inc. | Apparatus and method employing two optical signals for stabilizing an optical interferometer |
| EP1884820A2 (en) * | 2006-08-02 | 2008-02-06 | Nec Corporation | Control system and control method for controlling optical modulator |
| CN103257463A (en) * | 2013-05-17 | 2013-08-21 | 山西大学 | Method for locking LiNbO3 Mach-RPAMZM offset working point |
-
2015
- 2015-06-23 CN CN201510349839.0A patent/CN104991394A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05323245A (en) * | 1992-05-18 | 1993-12-07 | Nec Corp | Control system for optical modulation |
| JPH10246874A (en) * | 1997-03-04 | 1998-09-14 | Nippon Telegr & Teleph Corp <Ntt> | Optical modulator control circuit |
| US6469817B1 (en) * | 1999-06-18 | 2002-10-22 | Trw Inc. | Apparatus and method employing two optical signals for stabilizing an optical interferometer |
| EP1168038A2 (en) * | 2000-06-30 | 2002-01-02 | Mitsubishi Denki Kabushiki Kaisha | Optical frequency doubling device and bias control method for such a device |
| EP1884820A2 (en) * | 2006-08-02 | 2008-02-06 | Nec Corporation | Control system and control method for controlling optical modulator |
| CN103257463A (en) * | 2013-05-17 | 2013-08-21 | 山西大学 | Method for locking LiNbO3 Mach-RPAMZM offset working point |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749420A (en) * | 2019-09-12 | 2020-02-04 | 芯华创(武汉)光电科技有限公司 | OFDR detection device |
| CN111211844A (en) * | 2020-04-20 | 2020-05-29 | 北京中创为南京量子通信技术有限公司 | Quantum key receiving chip and device |
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Application publication date: 20151021 |