CN104316003A - Online detection device and method for polarization axis alignment in direct coupling process of polarization-preserving fiber ring and Y waveguide - Google Patents
Online detection device and method for polarization axis alignment in direct coupling process of polarization-preserving fiber ring and Y waveguide Download PDFInfo
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Abstract
The invention discloses an online detection device and method for polarization axis alignment in the direct coupling process of a polarization-preserving fiber ring and a Y waveguide. The polarization axis online detection device comprises a polarization axis detection device and an image processing module. The polarization axis detection device comprises an illumination system, an imaging system and a CCD camera. The imaging system comprises a reflective optical element and an objective lens, and is used for imaging and magnifying the end face of the Y waveguide and the end face of a tail fiber assembly of the tail the polarization-preserving fiber ring. The method comprises the steps that (1) the Y waveguide and the tail ring assembly of the polarization-preserving fiber ring are mounted, and the end face of the Y waveguide and the end face of the tail ring assembly of the polarization-preserving fiber ring are adjusted to be in parallel; (2) the imaging system is adjusted to enable the CCD camera to obtain a clear image; (3) the image is collected to a memory, and the deviation angle of the polarization axis of the Y waveguide and the fiber polarization axis of the polarization-preserving ring is acquired and calculated. According to the online detection device and method, the relative position information of the polarization axes of the polarization-preserving ring and the Y waveguide in the direct coupling process can be acquired in real time, quantitative evaluation can be made for the final state of the alignment of the polarization axes, and a foundation is laid for further improving the axis alignment precision.
Description
Technical field
The invention belongs to sensory field of optic fibre, relate to a kind of polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle is aligned in line detector and On-line Measuring Method thereof.
Background technology
Optical fibre gyro is a kind of all solid state pure optical inertial device, and ultimate principle is Sagnac (Sagnac) effect and optics reciprocity.The light path part of optical fibre gyro forms primarily of optical device, polarization-maintaining fiber coil and detector.Wherein, optical device comprises wideband light source, fiber coupler and Y waveguide; Y waveguide integrated chip beam splitter, polarizer and wideband phase modulator, serve light splitting close light, rise inclined the function of analyzing and light phase modulation, be the vitals of light path part.
At present, fiber-optic gyroscope light path adopts Y waveguide tail optical fiber to be connected with polarization-maintaining fiber coil fused fiber splice mode usually, and first Y waveguide is coupled with polarization maintaining optical fibre, and its sub-band protects Y waveguide and the polarization-maintaining fiber coil fused fiber splice of inclined tail optical fiber.The key of coupling technique is that the polarization axle of Y waveguide and the polarization axle of polarization maintaining optical fibre are aimed at, extinction ratio tester is adopted to monitor the change of tail optical fiber output terminal extinction ratio in coupling process, indicate the adjustment of accurate sextuple regulating platform, complete Y waveguide polarization axle and the shaft alignement of polarization maintaining optical fibre polarization.This Y waveguide tail optical fiber and polarization-maintaining fiber coil Fiber connection mode Problems existing are between Y waveguide and polarization-maintaining fiber coil, introduce two fusion points, reduce the reliability of system; The existence of fusion point simultaneously increases the polarization cross coupling of waveguide output channel, reduces the accuracy of detection of system; And welding needs certain fiber lengths, not only make the assembly technology consistance of light path reduce, and four of easy destruction fiber optic loop is extremely symmetrical.
In order to solve the problems referred to above that Y waveguide tail optical fiber and polarization-maintaining fiber coil fused fiber splice exist, improving the performance of optical fibre gyro system further, usually adopting direct-coupled mode to carry out the connection of Y waveguide and polarization-maintaining fiber coil.
As shown in Figure 1, polarization-maintaining fiber coil is directly connected with Y waveguide by two pigtail assemblies direct-coupling light channel structure, and this connected mode eliminates two fusion points between Y waveguide and polarization-maintaining fiber coil.Two pigtail assemblies are made by being fixed on by polarization-maintaining fiber coil optical fiber on optical fiber training sheet, for being coupled of auxiliary polarization-maintaining fiber coil and Y waveguide.
Polarization-maintaining fiber coil optical fiber and Y waveguide direct-coupling comprise input optical fibre assembly and fiber optic loop two pigtail assembly makes two parts, input optical fibre assembly and fiber optic loop two pigtail assembly and Y waveguide output end face aim at and stick with glue connect fixing.In fiber optic loop pigtail assembly after usual setting completes, sideline is parallel with polarization-maintaining fiber coil optical fiber polarisation axle on the surface for optical fiber training sheet.
After polarization-maintaining fiber coil two pigtail assembly completes, be arranged on reference fixture, and be transferred to muller and grind out certain angle, to mate the angled end-face coupling of polarization-maintaining fiber coil optical fiber and Y waveguide.
Existing direct-coupling technology relies on mechanical clamp transmission parallel relation to complete polarization-maintaining fiber coil optical fiber and aims at the polarization axle of Y waveguide.Namely, after having ground, the fixture with polarization-maintaining fiber coil two pigtail assembly is arranged on the assigned address of coupling table.After installation, upper surface and the Y waveguide upper surface of optical fiber training sheet are in same level, and then make the polarization axle of the polarization axle of Y waveguide and polarization-maintaining fiber coil optical fiber be in alignment.After said process all completes, by the change of monitoring output terminal luminous power, complete the coupling of minimum added losses.Then carry out gluing together, ultra-violet curing.
But, when the polarization axle alignment methods of Y waveguide and polarization maintaining optical fibre is applied to direct-coupling, there is following problem:
1, when fiber optic loop first pigtail assembly is coupled with Y waveguide, if adopt directly survey extinction ratio measurement to carry out polarization axle aligning, in fiber optic loop pigtail assembly and Y waveguide coupling process need extinction ratio tester to be connected to the polarization-maintaining fiber coil other end, because polarization-maintaining fiber coil self has higher polarization crosstalk, make the resolution of observed result lower, so polarisation-affecting axle to axle precision.
2, when fiber optic loop second pigtail assembly is coupled with Y waveguide, the light path that Y waveguide and polarization-maintaining fiber coil are formed is in closure state, cannot complete polarization axle alignment function by the mode detecting output terminal extinction ratio.
Simultaneously, what in existing direct-coupling technology, polarization axle was aimed at completes the physical dimension relation depended between the machining accuracy of fixture and mechanical parts, causing cannot the relative position of Real-Time Monitoring Y waveguide and polarization-maintaining fiber coil optical fiber polarisation axle, thus cannot make quantitative evaluation to the end-state that polarization axle is aimed at.
Summary of the invention
The real-time detection of polarization axle and alignment issues when the present invention is in order to solve polarization-maintaining fiber coil and Y waveguide direct-coupling, propose a kind of polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle is aligned in line detector and On-line Measuring Method thereof, be intended to the assembling consistance and the reliability that improve optical fibre gyro.
Polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle are aligned in line detector, comprise polarization axle pick-up unit and image processing module;
Image processing module stores on computers;
Polarization axle pick-up unit comprises illuminator, imaging system and CCD camera; For obtaining the end view drawing picture just to the Y waveguide placed and pigtail assembly.
Illuminator adopts axis light lighting system, throws light on to the pigtail assembly of Y waveguide and polarization-maintaining fiber coil;
Imaging system comprises reflective optical devices and object lens; Reflective optical devices, object lens and CCD camera are coaxially arranged; Described reflective optical devices workplace is coated with highly reflecting films, is positioned between Y waveguide and the pigtail assembly of polarization-maintaining fiber coil, Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end view drawing picture are reflexed to object lens, arrived the sensitive area of CCD by object lens;
The end view drawing picture of the pigtail assembly of CCD camera real-time reception Y waveguide end face and polarization-maintaining fiber coil, and transmitted image processing module and process;
Image processing module is divided into image capture module and polarization axle detection module;
Two end view drawing pictures that image capture module Real-time Collection CCD camera is collected;
Polarization axle detection module processes end face image, according to the shape of image and the mutual alignment relation that are imaged onto Y waveguide end face and fiber optic loop pigtail assembly end face in CCD camera, obtain the angle information of Y waveguide TE mould and polarization-maintaining fiber coil optical fiber polarisation axle respectively, and the deviation angle both calculating, for polarization shaft alignement.
Reflective optical devices is preferably coated with the right-angle prism of high-reflecting film, and available rotating mirror or double mirror substitute.
Reflective optical devices selects right-angle prism, right-angle prism is positioned between Y waveguide and the pigtail assembly of polarization-maintaining fiber coil, two sides are coated with high-reflecting film, for reflecting the image information of the Y waveguide end face after over-illumination and polarization-maintaining fiber coil pigtail assembly end face respectively to object lens.During installation, the bottom surface of right-angle prism is reference field, reference planes and plane perpendicular, reference planes placement all parallel with the pigtail assembly end face of polarization-maintaining fiber coil with Y waveguide end face, namely the central coaxial line of the pigtail assembly of Y waveguide and polarization-maintaining fiber coil is perpendicular through the reference surface of right-angle prism.
The first alternative scheme of reflective optical devices is rotating mirror; Described reflective optical devices is rotating mirror; Rotating mirror workplace is single reflecting surface, and its rotation centerline is perpendicular to the central coaxial line of the pigtail assembly of Y waveguide and polarization-maintaining fiber coil; Reflecting surface has 1 and 2 two kind of location status, is obtained by another location state half-twist; Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end view drawing picture is respectively used to reflex to object lens.
Reflective optical devices the second alternative scheme is double mirror; Double mirror is positioned between Y waveguide and polarization-maintaining fiber coil pigtail assembly both ends of the surface, and two workplaces correspond respectively to Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face; Two groups of object lens are adopted to carry out imaging amplification to Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face respectively, wherein, the corresponding CCD camera of each object lens, two CCD camera are respectively used to the image of collection two end faces, and the both ends of the surface image collected is sent to computing machine respectively processes.
A kind of polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle aim at On-line Measuring Method, specifically comprise following step:
Step one, installation Y waveguide and polarization-maintaining fiber coil pigtail assembly, adjustment Y waveguide end face is parallel with polarization-maintaining fiber coil pigtail assembly end face;
Step 2, insert polarization axle be aligned in line detector in Y waveguide and polarization-maintaining fiber coil direct-coupling process unit, adjustment imaging system, makes CCD camera obtain picture rich in detail;
First moving in parallel polarization-maintaining fiber coil pigtail assembly makes Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face keep suitable distance, is advanced to by reflective optical devices between Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face; Adjustment object lens make clear Y waveguide end face and the image of polarization-maintaining fiber coil pigtail assembly end face demonstrating CCD camera shooting on image capture module;
Step 3, gather image to internal memory, obtain and calculate the deviation angle of Y waveguide polarization axle and polarization-maintaining fiber coil optical fiber polarisation shaft angle degree;
Concrete steps are as follows:
Step 301: the angle information being obtained Y waveguide polarization axle by the angle of the coboundary obtaining Y waveguide end face;
First to the Image Segmentation Using that CCD camera collects, region corresponding to Y waveguide end face is intercepted; Image denoising, binaryzation operation are carried out to this region; Then obtain the coboundary information of Y waveguide end face, to up contour point carry out fitting a straight line obtain corresponding to Y waveguide end face upper sideline straight-line equation; With this equation for datum line equation, the angle initialization that the straight slope of this datum line equation is corresponding is the angle of the upper sideline of Y waveguide end face, i.e. the angle of Y waveguide polarization axle;
Step 302: the angle information being obtained polarization-maintaining fiber coil optical fiber polarisation axle by the angle information obtaining polarization-maintaining fiber coil pigtail assembly end face upper sideline;
CCD camera gathers the end view drawing picture of polarization-maintaining fiber coil pigtail assembly end face after internal memory, and polarization axle detection module, to the Image Segmentation Using process collected, obtains the region corresponding to polarization-maintaining fiber coil pigtail assembly end face; Denoising, binaryzation operation are carried out to this region; Obtain the angle of polarization-maintaining fiber coil pigtail assembly end face upper sideline; Training sheet upper surface sideline with polarization maintaining optical fibre polarization axle according to optical fiber is parallel relation, determines polarization-maintaining fiber coil optical fiber polarisation axle angle information, and feed back to image capture module by the transmission of parallel relation;
Step 303: the polarization axle differential seat angle calculating Y waveguide and polarization-maintaining fiber coil;
The angle information of Y waveguide TE mould and polarization-maintaining fiber coil optical fiber polarisation axle is obtained according to the shape of image and mutual alignment relation that are imaged onto Y waveguide end face and fiber optic loop pigtail assembly end face in CCD camera, the deviation angle of both calculating is also shown to image capture module, for polarization shaft alignement.
The invention has the advantages that:
(1) polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle are aligned in line detector, complete the real-time detection to Y waveguide and polarization-maintaining fiber coil optical fiber polarisation axle relative position, instead of adopt the method detecting the change of output terminal extinction ratio, solve because fiber optic loop depolarization and light path close the problem that caused extinction ratio accuracy of detection is low or cannot measure.
(2) polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle are aligned in line detector, by image processing module Real-time Collection Y waveguide and pigtail assembly end view drawing picture, obtain the positional information of Y waveguide and polarization-maintaining fiber coil optical fiber polarisation axle, the deviation angle of both calculating, quantitative evaluation being made to the end-state that polarization axle is aimed at, for improving further, axle precision being laid the foundation.
(3) polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle aim at On-line Measuring Method, provide a kind of method that objective polarization axle detects and aims at, and ensure polarization axle alignment methods relative to existing by fixture, alignment precision is higher.
Accompanying drawing explanation
Fig. 1 is polarization-maintaining fiber coil and Y waveguide direct-coupling schematic diagram;
Fig. 2 is the structural representation of polarization axle on-line measuring device;
Fig. 3 is the operating diagram of polarization axle pick-up unit embodiment one;
Fig. 4 is polarization axle pick-up unit embodiment two light channel structure schematic diagram;
Fig. 5 is polarization axle pick-up unit embodiment three light channel structure schematic diagram;
Fig. 6 is polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle On-line Measuring Method process flow diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
A kind of polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle on-line measuring device and On-line Measuring Method thereof, by the mode Real-time Collection Y waveguide of end face imaging and the end view drawing picture of polarization-maintaining fiber coil optical fiber component, according to the shape of image and the relative position information of mutual alignment Relation acquisition Y waveguide and polarization-maintaining fiber coil optical fiber polarisation axle that are imaged onto Y waveguide end face and fiber optic loop pigtail assembly end face in CCD camera.
A kind of polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle on-line measuring device, as shown in Figure 2: comprise polarization axle pick-up unit and image processing module;
Wherein, polarization axle pick-up unit comprises illuminator, imaging system and CCD camera; Image processing module stores on computers.
Illuminator adopts axis light lighting system, for throwing light on to the pigtail assembly end face of Y waveguide end face and polarization-maintaining fiber coil;
Imaging system belongs to the core of polarization axle pick-up unit, is made up of reflective optical devices and object lens.
Embodiment one:
The concrete structure of imaging system is as shown in Figure 3, as follows:
What reflective optical devices was chosen is the high precision right-angle prism being coated with highly reflecting films, and available rotating mirror or double mirror substitute, and serves the effect of optical axis of turning back.
When building the light path of polarization axle pick-up unit, Y waveguide, polarization-maintaining fiber coil pigtail assembly, imaging system and CCD camera are coaxially arranged.Specifically be set to: right-angle prism is positioned between the pigtail assembly end face B of Y waveguide end face A and polarization-maintaining fiber coil, with the bottom surface F of right-angle prism for reference field, right-angle prism reference planes C is vertical with prism bases F, the equal keeping parallelism of pigtail assembly end face B of reference planes C and Y waveguide end face A and polarization-maintaining fiber coil, namely the central coaxial line of the pigtail assembly of Y waveguide and polarization-maintaining fiber coil is perpendicular through the reference surface C of right-angle prism; Two sides D and E is the workplace of right-angle reflecting prism, is all coated with highly reflecting films, and reflection Y waveguide end face A and polarization-maintaining fiber coil pigtail assembly end face B image information are to object lens respectively.
From the light propagated along optical axis direction that Y waveguide end face A sends, with 45 ° of incident angles to the side E of right-angle prism; Incident ray reflexes to just to coaxial object lens through side E, and reflection ray direction is vertical with incident ray direction; Y waveguide end face A, by carrying out imaging amplification to the reflection ray with Y waveguide end face A information, is imaged on the sensitive area of CCD camera by object lens.By adjusting the distance of object lens and Y waveguide end face A, Y waveguide end face A energy blur-free imaging is at the sensitive area of CCD camera.Due to the symmetry of light channel structure, the pigtail assembly end face B of polarization-maintaining fiber coil is imaged on the sensitive area of CCD in the same way.After light path has adjusted, Y waveguide end face A and polarization-maintaining fiber coil pigtail assembly end face B amplifies through object lens, and blur-free imaging is at the diverse location of same CCD camera simultaneously.
CCD camera is used for the image of the end face B of the pigtail assembly of Y waveguide end face A received by Real-time Collection and polarization-maintaining fiber coil, and is transmitted image processing module and process;
Described image processing module belongs to the software section of computing machine, mainly comprises image capture module and polarization axle detection module;
Image capture module Real-time Collection end view drawing picture, and carry out man-machine interaction in conjunction with polarization axle detection module.
Polarization axle detection module is used for processing the image that CCD camera receives, and obtains the angle information of Y waveguide TE mould and polarization-maintaining fiber coil optical fiber polarisation axle respectively.
The representative of Y waveguide TE mould be the direction of Y waveguide polarization axle, and be perfect parallelism with the upper sideline of Y waveguide end face A.Namely the angle information of Y waveguide polarization axle is obtained by the angle of the upper sideline obtaining Y waveguide end face A.
Concrete computation process:
First to the Image Segmentation Using that CCD camera collects, the fixed area corresponding to Y waveguide end face A is intercepted; Image denoising, binaryzation operation are carried out to this region; Then obtain the coboundary information of Y waveguide end face A, the straight-line equation that fitting a straight line obtains corresponding to Y waveguide end face A upper sideline is carried out to up contour point; With this equation for datum line equation, the angle initialization that the straight slope of this datum line equation is corresponding is the angle of the upper sideline of Y waveguide end face A, and namely the angle of Y waveguide polarization axle, is designated as α.
The determination of polarization-maintaining fiber coil optical fiber polarisation axle angle information depends on following parallel relation: the polarization axle of polarization-maintaining fiber coil optical fiber is parallel with polarization-maintaining fiber coil pigtail assembly end face B upper sideline, and namely the angle information obtaining polarization-maintaining fiber coil pigtail assembly end face B upper sideline obtains the angle information of polarization-maintaining fiber coil optical fiber polarisation axle.
The gatherer process of the angle information of concrete polarization-maintaining fiber coil optical fiber polarisation axle is as follows: first carry out Iamge Segmentation to the image that CCD camera collects, and obtains the fixed area corresponding to polarization-maintaining fiber coil pigtail assembly end face B; Denoising, binaryzation operation are carried out to this region; Obtain the marginal information of polarization-maintaining fiber coil pigtail assembly end face B, thus obtain the angle of polarization-maintaining fiber coil pigtail assembly end face B upper sideline; Determine polarization-maintaining fiber coil optical fiber polarisation axle angle information by the transmission of parallel relation, this angle is designated as β.
Calculate the deviation angle that namely alpha-beta obtains the two; Simultaneously by deviation angle information displaying to image capture module.
Embodiment two:
Described right-angle prism adopts double mirror to substitute, and concrete structure is as follows:
As shown in Figure 4, Y waveguide, polarization-maintaining fiber coil pigtail assembly and double mirror are coaxially arranged, double mirror is positioned between Y waveguide and polarization-maintaining fiber coil pigtail assembly both ends of the surface, and two workplaces correspond respectively to Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face; Two groups of object lens are adopted to carry out imaging amplification to Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face respectively, wherein, the corresponding CCD camera of each object lens, two CCD camera are respectively used to the image of collection two end faces, and the both ends of the surface image collected is sent to computing machine respectively processes.
Be specially the light propagated along optical axis direction sent from Y waveguide end face A, be incident to the side of double mirror with the direction of 45 ° of incident angles; Incident ray reflexes to just to coaxial object lens through double mirror, and reflection ray direction is vertical with incident ray direction; Y waveguide end face, by carrying out imaging amplification to the reflection ray with Y waveguide end face information, is imaged on the sensitive area of CCD camera by object lens.By adjusting the distance of object lens and Y waveguide end face, Y waveguide end face energy blur-free imaging is at the sensitive area of CCD camera.
The light propagated along optical axis direction that pigtail assembly end face B sends, incides the opposite side of double mirror, then amplifies through object lens, be imaged on the sensitive area of CCD with the direction of 45 ° of incident angles.
After light path has adjusted, Y waveguide end face A and polarization-maintaining fiber coil pigtail assembly end face B amplifies through each self-corresponding object lens, is imaged on corresponding CCD camera sensitive area.
Embodiment three:
Described right-angle prism adopts rotating mirror to replace, and concrete structure is as follows:
As shown in Figure 5, Y waveguide, polarization-maintaining fiber coil pigtail assembly and rotating mirror are coaxially arranged, and rotating mirror is positioned between Y waveguide and polarization-maintaining fiber coil pigtail assembly both ends of the surface; Rotating mirror workplace is single reflecting surface, and its rotation centerline is perpendicular to the central coaxial line of the pigtail assembly of Y waveguide and polarization-maintaining fiber coil; Reflecting surface has 1 and 2 two kind of location status, rotates 90 by another location state
°obtain; Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end view drawing picture is respectively used to reflex to object lens.
When rotating mirror is to position 1, from the light propagated along optical axis direction that Y waveguide end face sends, be incident to the reflecting surface of rotating mirror with the direction of 45 ° of incident angles; Incident ray through reflective surface to just to coaxial object lens; Carry out imaging amplification through object lens, Y waveguide end face is imaged on the sensitive area of CCD camera.
The image of the Y waveguide end face received by CCD camera Real-time Collection, and the image processing module being sent to computing machine processes, obtains and stores the angle [alpha] 1 of Y waveguide polarization axle.Then, rotate catoptron to position 2, now, the light propagated along optical axis direction that polarization-maintaining fiber coil pigtail assembly end face sends, incides catoptron with the direction of 45 ° of incident angles equally, then amplifies through object lens, be imaged on the sensitive area of CCD.The image of the polarization-maintaining fiber coil pigtail assembly end face received by CCD camera Real-time Collection, and the image processing module being sent to computing machine processes, and obtains the angle beta 1 of polarization-maintaining fiber coil optical fiber polarisation axle.In conjunction with the angle [alpha] 1 of stored Y waveguide polarization axle, calculate the deviation angle that namely α 1-β 1 obtains the two; Simultaneously by deviation angle information displaying to image capture module.
The real-time measurement of what the present invention realized is polarization axle in polarization-maintaining fiber coil and Y waveguide direct-coupling process, ultimate principle is the image of the end face of pigtail assembly by end face imaging mode Real-time Collection Y waveguide end face and polarization-maintaining fiber coil, and adopts the method for image procossing to obtain Y waveguide and polarization-maintaining fiber coil polarization axle relative position information.When carrying out Y waveguide and the end face imaging of polarization-maintaining fiber coil pigtail assembly, need, by the reflective optical devices turnover optical axis be positioned between the very short both ends of the surface of distance, object lens just can be made to carry out imaging amplification to end face.Therefore, no matter place which kind of optical element between Y waveguide and polarization-maintaining fiber coil, place in which way, as long as its effect played is identical with the present invention, replacement scheme of the present invention is all belonged to.
A kind of polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle aim at On-line Measuring Method, and flow process as shown in Figure 6, specifically comprises following step:
Step one, installation Y waveguide and polarization-maintaining fiber coil pigtail assembly, adjustment Y waveguide end face is parallel with polarization-maintaining fiber coil pigtail assembly end face;
Step 2, adjustment imaging system, make CCD camera obtain picture rich in detail;
First moving in parallel polarization-maintaining fiber coil pigtail assembly makes Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face keep suitable distance, is advanced to by reflective optical devices between Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face; Adjustment object lens make clear Y waveguide end face and the image of polarization-maintaining fiber coil pigtail assembly end face demonstrating CCD camera shooting on image capture module;
Step 3, gather image to internal memory, obtain and calculate the deviation angle of Y waveguide polarization axle and polarization-maintaining fiber coil optical fiber polarisation shaft angle degree;
Concrete steps are as follows:
Step 301: the angle information being obtained Y waveguide polarization axle by the angle of the coboundary obtaining Y waveguide end face;
First to the Image Segmentation Using that CCD camera collects, region corresponding to Y waveguide end face is intercepted; Image denoising, binaryzation operation are carried out to this region; Then obtain the coboundary information of Y waveguide end face, to up contour point carry out fitting a straight line obtain corresponding to Y waveguide end face upper sideline straight-line equation; With this equation for datum line equation, the angle initialization that the straight slope of this datum line equation is corresponding is the angle of the upper sideline of Y waveguide end face, i.e. the angle of Y waveguide polarization axle;
Step 302: the angle information being obtained polarization-maintaining fiber coil optical fiber polarisation axle by the angle information obtaining polarization-maintaining fiber coil pigtail assembly end face upper sideline;
CCD camera gathers the end view drawing picture of polarization-maintaining fiber coil pigtail assembly end face after internal memory, and polarization axle detection module, to the Image Segmentation Using process collected, obtains the region corresponding to polarization-maintaining fiber coil pigtail assembly end face; Denoising, binaryzation operation are carried out to this region; Obtain the angle of polarization-maintaining fiber coil pigtail assembly end face upper sideline; Training sheet upper surface sideline with polarization maintaining optical fibre polarization axle according to optical fiber is parallel relation, determines polarization-maintaining fiber coil optical fiber polarisation axle angle information, and feed back to image capture module by the transmission of parallel relation;
Step 303: the polarization axle differential seat angle calculating Y waveguide and polarization-maintaining fiber coil;
The angle information of Y waveguide TE mould and polarization-maintaining fiber coil optical fiber polarisation axle is obtained according to the shape of image and mutual alignment relation that are imaged onto Y waveguide end face and fiber optic loop pigtail assembly end face in CCD camera, the deviation angle of both calculating is also shown to image capture module, for polarization shaft alignement.
Claims (5)
1. polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle are aligned in line detector, comprise polarization axle pick-up unit and image processing module;
Image processing module stores on computers;
Polarization axle pick-up unit comprises illuminator, imaging system and CCD camera, for obtaining the end view drawing picture just to the Y waveguide placed and polarization-maintaining fiber coil pigtail assembly;
Illuminator adopts axis light lighting system, throws light on to the pigtail assembly of Y waveguide and polarization-maintaining fiber coil;
Imaging system comprises reflective optical devices and object lens; Reflective optical devices, object lens and CCD camera are coaxially arranged; Reflective optical devices workplace is coated with highly reflecting films, is positioned between Y waveguide and the pigtail assembly of polarization-maintaining fiber coil, Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end view drawing picture are reflexed to object lens, arrived the sensitive area of CCD by object lens;
The end view drawing picture of the pigtail assembly of CCD camera real-time reception Y waveguide end face and polarization-maintaining fiber coil, and transmitted image processing module and process;
Image processing module is divided into image capture module and polarization axle detection module;
Two end view drawing pictures that image capture module Real-time Collection CCD camera is collected;
Polarization axle detection module processes end face image, obtains the angle information of Y waveguide TE mould and polarization-maintaining fiber coil optical fiber polarisation axle respectively, and the deviation angle both calculating, for polarization shaft alignement.
2. a kind of polarization-maintaining fiber coil as claimed in claim 1 and Y waveguide direct-coupling polarization axle are aligned in line detector, it is characterized in that: described reflective optical devices is right-angle prism; Two sides are coated with high-reflecting film, for reflecting the image information of the Y waveguide end face after over-illumination and polarization-maintaining fiber coil pigtail assembly end face respectively to object lens; During installation, the bottom surface of right-angle prism is reference field, reference planes and plane perpendicular, reference planes placement all parallel with the pigtail assembly end face of polarization-maintaining fiber coil with Y waveguide end face.
3. a kind of polarization-maintaining fiber coil as claimed in claim 1 and Y waveguide direct-coupling polarization axle are aligned in line detector, it is characterized in that: described reflective optical devices is double mirror; Two workplaces of double mirror correspond respectively to Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face; Two groups of object lens are adopted to carry out imaging amplification to Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face respectively, wherein, the corresponding CCD camera of each object lens, two CCD camera are respectively used to the image of collection two end faces, and the both ends of the surface image collected is sent to computing machine respectively processes.
4. a kind of polarization-maintaining fiber coil as claimed in claim 1 and Y waveguide direct-coupling polarization axle are aligned in line detector, it is characterized in that: described reflective optical devices is rotating mirror; Rotating mirror workplace is single reflecting surface, and its rotation centerline is perpendicular to the central coaxial line of the pigtail assembly of Y waveguide and polarization-maintaining fiber coil; Reflecting surface has 1 and 2 two kind of location status, is obtained by another location state half-twist; Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end view drawing picture is respectively used to reflex to object lens.
5. application rights requires that the polarization-maintaining fiber coil described in 1 and Y waveguide direct-coupling polarization axle are aligned in polarization-maintaining fiber coil and the Y waveguide direct-coupling polarization axle On-line Measuring Method of line detector, specifically comprises following step:
Step one, installation Y waveguide and polarization-maintaining fiber coil pigtail assembly, adjustment Y waveguide end face is parallel with polarization-maintaining fiber coil pigtail assembly end face;
Step 2, insert polarization axle be aligned in line detector in Y waveguide and polarization-maintaining fiber coil direct-coupling process unit, adjustment imaging system, makes CCD camera obtain picture rich in detail;
First, move in parallel polarization-maintaining fiber coil pigtail assembly and make Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face keep suitable distance, reflective optical devices is advanced between Y waveguide end face and polarization-maintaining fiber coil pigtail assembly end face; Adjustment object lens make clear Y waveguide end face and the image of polarization-maintaining fiber coil pigtail assembly end face demonstrating CCD camera shooting on image capture module;
Step 3, gather image to internal memory, obtain and calculate the deviation angle of Y waveguide polarization axle and polarization-maintaining fiber coil optical fiber polarisation shaft angle degree;
Concrete steps are as follows:
Step 301: the angle information being obtained Y waveguide polarization axle by the angle of the coboundary obtaining Y waveguide end face;
First to the Image Segmentation Using that CCD camera collects, region corresponding to Y waveguide end face is intercepted; Image denoising, binaryzation operation are carried out to this region; Then obtain the coboundary information of Y waveguide end face, to up contour point carry out fitting a straight line obtain corresponding to Y waveguide end face upper sideline straight-line equation; With this equation for datum line equation, the angle initialization that the straight slope of this datum line equation is corresponding is the angle of the upper sideline of Y waveguide end face, i.e. the angle of Y waveguide polarization axle;
Step 302: the angle information being obtained polarization-maintaining fiber coil optical fiber polarisation axle by the angle information obtaining polarization-maintaining fiber coil pigtail assembly end face upper sideline;
CCD camera gathers the end view drawing picture of polarization-maintaining fiber coil pigtail assembly end face after internal memory, and polarization axle detection module, to the Image Segmentation Using process collected, obtains the region corresponding to polarization-maintaining fiber coil pigtail assembly end face; Denoising, binaryzation operation are carried out to this region; Obtain the angle of polarization-maintaining fiber coil pigtail assembly end face upper sideline; Parallel with polarization maintaining optical fibre polarization axle according to optical fiber training sheet upper surface sideline, determine polarization-maintaining fiber coil optical fiber polarisation axle angle information by the transmission of parallel relation, and feed back to image capture module;
Step 303: the polarization axle differential seat angle calculating Y waveguide and polarization-maintaining fiber coil;
The angle information of Y waveguide TE mould and polarization-maintaining fiber coil optical fiber polarisation axle is obtained according to the shape of image and mutual alignment relation that are imaged onto Y waveguide end face and fiber optic loop pigtail assembly end face in CCD camera, the deviation angle of both calculating is also shown to image capture module, for polarization shaft alignement.
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| CN201410602250.2A CN104316003B (en) | 2014-10-31 | Polarization-maintaining fiber coil and Y waveguide direct-coupling polarization axle are aligned in line detector and On-line Measuring Method thereof |
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