CN101750059A - Memory and I/O bridge controller (MIOC) integrated optical circuit for depolarization input/output of fiber optic gyroscope (FOG) - Google Patents
Memory and I/O bridge controller (MIOC) integrated optical circuit for depolarization input/output of fiber optic gyroscope (FOG) Download PDFInfo
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- CN101750059A CN101750059A CN200810218293A CN200810218293A CN101750059A CN 101750059 A CN101750059 A CN 101750059A CN 200810218293 A CN200810218293 A CN 200810218293A CN 200810218293 A CN200810218293 A CN 200810218293A CN 101750059 A CN101750059 A CN 101750059A
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Abstract
The invention discloses a memory and I/O bridge controller (MIOC) integrated optical circuit for depolarization input/output of a fiber optic gyroscope (FOG), which can efficiently integrate an LYOT depolarizer with an MIOC so as to shorten the length of a polarization-preserving fiber for the LYOT depolarizer, can reduce the technique difficulty and the cost of inducted polarization-preserving fiber materials and improve the long-term reliability of a system. The realizing method of the MIOC integrated optical circuit is to rotate a stress area of the output part of a tail fiber of the MIOC integrated optical circuit and the polarization state of MIOC waveguide output light wave by 45 degrees.
Description
Technical field
The present invention relates to optical gyroscope, belong to the gyro technical field, specifically is a kind of integrated optical circuit that is used for fibre optic gyroscope.
Background technology
The optical polarization that transmits in the orientation of the inclined to one side tail optical fiber stress axis of guarantor of traditional multi-functional modulator of MIOC integrated optics and the chip waveguide is identical, and slow axis or fast axle are to keep polarization stability.
In order to reduce the cost of polarization maintaining optical fibre, the selected fiber optic loop of depolarization optical fibre gyro is a general single mode fiber.When polarized lightwave is propagated therein, can be owing to distortion, reasons such as stress birefrin, polarization state changes.Therefore the polarization maintaining optical fibre that deviatoric stress district 45 degree are aimed at is protected in welding therein, be used for the light wave of 2 polarization direction quadratures fully warm, as the LYOT depolarizer, to reduce their difference, but there are many intermediate light welding points in the assembling that has caused present optical fibre gyro thus, and MIOC has 3 sections to connect polarization maintaining optical fibre, just needs 3 LYOT depolarizers, light source input end depolarization once, depolarization is 2 times in the fiber optic loop; Cause several welding points of the LYOT depolarizer between the fiber optic loop thus, cause the assembling difficulty of optical fibre gyro big, operation is many, and the light reflecting background of welding point is big in unstable properties, the fiber optic loop.In order to improve the technology terseness, promote long-term reliability, optical fibre gyro is badly in need of a kind of integrated LYOT depolarizer.The exploitation of this integrated LYOT depolarizer will significantly improve life-span and the technology terseness of optical fibre gyro.
Summary of the invention
Technical matters to be solved by this invention provides a kind of MIOC integrated optical circuit that is used for the input and output of fibre optic gyroscope depolarization light, it can integrate LYOT depolarizer and MIOC device effectively, shortened the length of the used polarization maintaining optical fibre of LYOT depolarizer, reduce technology difficulty, reduce the polarization maintaining optical fibre material cost of introducing thus, improve the long-term reliability of system.
For solving the problems of the technologies described above, a kind of MIOC integrated optical circuit that is used for the input and output of optical fibre gyro depolarization light of the present invention, the stress area of the inclined to one side tail optical fiber output of the guarantor of described MIOC integrated optical circuit becomes 45 degree with the polarization state angle of MIOC waveguide output light-wave.
This structure makes single polarization state light wave depolarization of MIOC output be low polarisation, thereby employing that will be originally external is than the LYOT optical fiber depolarizer of long optical fibers effectively, be integrated into the inside of MIOC, make the polarization extinction ratio of output terminal be close to 0, and the polarization extinction ratio of the light wave that returns from input end is also near being 0.The fiber lengths that this structure also makes LYOT type depolarizer use is reduced to the shortest, simultaneously the welding point number in the depolarization fiber optic loop is reduced to consistent with the number of the welding node of polarization-maintaining fiber coil, improves the interior polarization stability of depolarization optical fibre gyro ring.Improve the long-term reliability of optical fibre gyro simultaneously.In addition, this succinct technology has been saved the polarization maintaining optical fibre cost and the time cost that adopt polarization maintaining optical fibre LYOT depolarizer to introduce.
Description of drawings
Fig. 1 is the structural drawing of the specific embodiment of the invention.
Embodiment
In the present embodiment, only be example with the panda type polarization-preserving fiber, certainly, the present invention is not limited only to panda type, also comprises bowtie-shaped, the polarization maintaining optical fibre of ellipse and other various designs.
As can be seen from Figure 1, polarization maintaining optical fibre is no longer with traditional alignment so and MIOC butt coupling.But dock with MIOC behind the rotation miter angle, thereby realized that LYOT depolarizer and MIOC become one.This is the core place of present technique.
The scheme that polarization maintaining optical fibre is aimed at light wave polarization direction employing miter angle in the MIOC chip can be selected for use the whole of 3 optical fiber Coupling points; Perhaps part is selected, and other select 0 degree welding; Even the specific angle of some or all of selection, to reach different polarization effect output, as elliptically polarized light input or output.
Conventional art uses Polarization Maintaining Optical Fiber Fusion Splicer, and when welding LYOT depolarizer, it is 45 degree that rotation needs 2 Stress Profile for Polarization-Maintaining regional perspectives of welding, and the depolarization precision depends on the performance of heat sealing machine; Wherein relate to the welding of the variety classes optical fiber of single-mode fiber and polarization maintaining optical fibre, fused fiber splice loss, depolarization performance, the reflecting background of welding point etc. all influences the overall performance of system.The poor stability of the system that causes thus, reliability is low.
The technical program is integrated together LYOT depolarizer and MIOC device, has improved reliability and technology terseness greatly, has reduced system's manufacturing cost, increases substantially production efficiency.
The wherein various performances, the production efficiency that comprise optics, electricity of MIOC modulator, manufacture craft can not have significant change because of the invention of this patent.Wherein insert the loss meeting and change, but this does not represent the performance change of MIOC owing to the input of depolarization light.
Claims (2)
1. a MIOC integrated optical circuit that is used for the input and output of optical fibre gyro depolarization light is characterized in that, the polarization state of the stress area direction of the inclined to one side tail optical fiber of guarantor of described MIOC integrated optical circuit and MIOC waveguide output light-wave reaches the effect of depolarization in angle of 45 degrees.
2. MIOC integrated optical circuit according to claim 1, it is characterized in that, the inclined to one side tail optical fiber of the guarantor of described MIOC integrated optical circuit is 3 tail optical fibers of input, output, and the polarization state of the stress area direction of its all or part of tail optical fiber and MIOC waveguide output light-wave reaches the effect of depolarization in angle of 45 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810218293A CN101750059A (en) | 2008-12-09 | 2008-12-09 | Memory and I/O bridge controller (MIOC) integrated optical circuit for depolarization input/output of fiber optic gyroscope (FOG) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810218293A CN101750059A (en) | 2008-12-09 | 2008-12-09 | Memory and I/O bridge controller (MIOC) integrated optical circuit for depolarization input/output of fiber optic gyroscope (FOG) |
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| Publication Number | Publication Date |
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| CN101750059A true CN101750059A (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810218293A Pending CN101750059A (en) | 2008-12-09 | 2008-12-09 | Memory and I/O bridge controller (MIOC) integrated optical circuit for depolarization input/output of fiber optic gyroscope (FOG) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114502119A (en) * | 2019-07-19 | 2022-05-13 | 克拉诺瓦公司 | Cutting device with optical coupler comprising polarization corrector |
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2008
- 2008-12-09 CN CN200810218293A patent/CN101750059A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114502119A (en) * | 2019-07-19 | 2022-05-13 | 克拉诺瓦公司 | Cutting device with optical coupler comprising polarization corrector |
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Open date: 20100623 |