CN1704780A - Light wavelength division multiplexer and optical fiber arrangement method - Google Patents

Abstract

This invention provides a light WDM device and its fiber queue method. After the first filtration by a filter, the light source of the penetration band can be filtered the second time by the reflection of an optical reflection mirror to get a good isolation of adjacent wave channels. The fiber queue method is that the fiber lead properly selects positions of the incident end fiber, the penetration fiber and the reflection fiber to get the same wave band and length sphere for the two filtrations and least insertion loss for the penetration end and the reflection end, so that the width is not reduced by the two times of penetration.

Description

Light wavelength division multiplexing and optical fiber arrangements method thereof

Technical field

The present invention relates to the dense wavelength division ripple multitask module (DWDM) that a kind of optical-fibre communications uses and the crucial basic module of adding and taking light multitask module (OADM).

Background technology

With reference to Figure 1A, be depicted as light wavelength division multiplexing commonly used (Optical Wavelength DivisionMultiplexer) 11, this light wavelength division multiplexing is the penetration light wavelength division multiplexing, comprise: fiber-optic wire 111, gradually changed refractive index lens 112, filter plate 113, gradually changed refractive index lens 119, fiber-optic wire 114, utilize bond 118 to be connected each other in regular turn, and incident end optical fiber 115 inserts on the fiber-optic wire 111 with reflection end optical fiber 116, and penetration end optical fiber 117 inserts on the fiber-optic wire 114.Incident wave band at first, via incident end optical fiber 115 again through gradually changed refractive index lens 112, at this moment, incident light wave band meeting incident filter plate 113, this filter plate 113 is for only to allow a kind of light of wave band to pass through, the light of all the other wave bands can be reflected, therefore, behind the incident wave band incident filter plate 113, just can be divided into and penetrate wave band and reflected waveband, penetrate wave band again through gradually changed refractive index lens 119, and be coupled (coupling) arrives penetration end optical fiber 117, another reflected waveband is coupled to reflection end optical fiber 116 again via gradually changed refractive index lens 112.This incident wave band is only through a filter plate, produced to penetrate the isolated degree of its adjacent channel of wave band (adjacent channel isolation) very not high, about 30dB.

With reference to Figure 1B, be depicted as another light wavelength division multiplexing commonly used, this light wavelength division multiplexing 12 is the reflecting light wavelength division multiplexer, comprise fiber-optic wire 121, hollow pad 122, gradually changed refractive index lens 123, filter plate 124 and catoptron 125, and utilize bond 129 to be connected between described each assembly, incident end optical fiber 126, reflection end optical fiber 127 all insert in the fiber-optic wire 121 with penetration end optical fiber 128.

When light wavelength division multiplexing 12 uses, the incident wave band of plural at least different-waveband wavelength imports via wherein incident end optical fiber 126 of fiber-optic wire 121, behind gradually changed refractive index lens (GRIN lens) 123, the light signal of wherein some specific band wavelength can be interfered plated film (multi-layer dielectric interference coating) by the multilayer dielectric on the filter plate 124, utilize optical mirror 125 reflections then, make this penetrate the wave band light source again through a filter plate 124, and then by gradually changed refractive index lens 123 optically focused, again by 128 outputs of the penetration end optical fiber on the fiber-optic wire 121; Multi-coated interference plated film reflection on then filtered 124 of the light signal of other wavelength focuses on fiber-optic wire through gradually changed refractive index lens 123, again via another reflection end optical fiber 127 outputs.

The advantage of this framework is to utilize a slice filter plate to make the mechanism of twice filtering, and reaches the very high isolated degree of adjacent channel, and only need utilize lens and a fiber-optic wire, so volume is very little.

But, when practical application, penetrate the wave band light source through twice filter plate, because incident angle is inversely proportional to the wavelength coverage that penetrates wave band, incident angle is big more, penetrate the inclined to one side short wavelength of wavelength coverage, incident angle is more little, penetrate the inclined to one side long wavelength of wavelength coverage, penetrated wavelength band width (transmission wavelength bandwidth) behind the filter plate for twice and must be identical just can not apply use because of the weak wavelength width that penetration end optical fiber is passed of pin mutually is too narrow, therefore, the reflecting light wavelength division multiplexer time just it should be noted that in design to make twice incident angle identical; In addition, the emphasis of another consideration is how to make the insertion of penetration end and reflection end lose (insertionloss) minimum from framework, and the insertion loss of penetration end and reflection end is more little, and the expression light source is few more through the luminous energy that assembly lost.

Summary of the invention

Desire of the present invention solves general reflecting light wavelength division multiplexer, and whether the wavelength coverage that must consider to penetrate for twice wave band simultaneously is identical, and whether the insertion of penetration end and reflection end loses problems such as minimum.In addition, owing to have an angle that tilts between known its catoptron of reflecting light wavelength division multiplexer and filter plate, prior art method is for to fix catoptron and filter plate with bond, bond expands because of temperature variation easily or shrinks, and cause the shift in position of catoptron, this can make to insert to lose once change and become many, and the present invention wishes to solve simultaneously above-mentioned these problems.

The present invention utilizes a fiber-optic wire (fiber pigtail), a column C shape lens (cylindricalshaped convex lens; C-Lens), the cap sleeve (cap) of one fixation of C shape lens, one surface has the filter plate (thin film filter) that multilayer dielectric is interfered plated film, one surface has the optical mirror (HR mirror) of reflected coat layer (highreflective coating), the hollow pad (spacer) of relative position between fixed lens and fiber-optic wire, fixedly filter plate and optical mirror between the inclination hollow pad with an angle [alpha] of relative position, all use bond (adhesives) to do to cohere between each assembly and assembly.Wherein fiber-optic wire comprises a lasso and a fibre bundle, and its lasso one end is a beveled end, and fibre bundle comprises incident end optical fiber, reflection end optical fiber, penetration end optical fiber and idle optical fiber, and this fibre bundle inserts in the fiber-optic wire.

Optical fiber arrangements method of the present invention:

On the ring face of fiber-optic wire, the mid point of fine nuclear of incident end optical fiber and the fine nuclear of reflection end optical fiber need equal the distance of the mid point of fine nuclear of incident end optical fiber and the fine nuclear of reflection end optical fiber to the fine nuclear of penetration end optical fiber to the distance of the fine nuclear of incident end optical fiber; And the fine nuclear location of penetration end optical fiber and reflection end optical fiber is online, must be with height point on the long limit of lasso and lasso central point online mutual vertical.

Can make that through optical fiber arrangements mode thus the incident angle when filter plate penetrated for the first time and penetrate for the second time is identical, so can be because of not reducing a little less than the pin mutually through the wave band wavelength width that penetration end optical fiber passes, and the reflection end insertion is lost and penetration end insertion loss can both be arrived optimum value by the while coupling, so the insertion loss is quite little.

Via improvement of the present invention, its advantage can be summarized as follows:

Utilization of the present invention has the fiber-optic wire lasso (ferrule) of a square aperture (square hole), be applied in reflective light wavelength division multiplexing, through suitable selection incident end (commoninput port), penetration end (transmission output port), the fiber position of reflection end (reflection output port), the incident angle that can obtain penetrating for twice filter plate is identical, so it is identical to penetrate the wavelength range scope of filter plate for twice, therefore the penetrated wave segment limit of going out through the penetration end optic fibre guide can not reduced, and has the isolated degree of high adjacent channel.

Utilization of the present invention has the fiber-optic wire lasso of a square aperture, be applied in reflective light wavelength division multiplexing, through the fiber position of suitable selection incident end, penetration end, reflection end, can obtain of the insertion loss of incident end simultaneously and can be minimum to penetration end and incident end to reflection end.

The present invention utilizes inclination hollow pad with the connecting piece as filter plate and optical mirror, be coupled to minimum light insertion loss earlier because work as incident wave band light source and reflected waveband light source, this moment, desire was coupled to minimum light when inserting loss with incident wave band light source with penetrating the wave band light source, this moment filter plate and optical mirror between must have an angle of inclination.Between general its catoptron of reflecting light wavelength division multiplexer and filter plate for utilizing bond to fix, and general bond expands or contraction because of temperature variation produces more easily because of thermal expansivity, and cause the angle of optical mirror to change, if the angle of inclination of catoptron changes, just can make the coupling that penetrates wave band not good, penetrate wave band luminous power step-down and cause, so, the present invention utilizes the connecting piece of inclination hollow pad as filter plate and optical mirror, because of employed its material of hollow pad is a low thermal coefficient of expansion, change so can significantly dwindle, and then improve optical stability because of temperature variation causes the angle of optical mirror.

In the application, being applied in the fiber optic wavelength multi-tasking by a plurality of light wavelength division multiplexings after modularization is present economy the most and the method that effectively solves the frequency range problem.Therefore need the adding and taking light multi-task module of the isolated degree of high radio frequency channel, will make the fiber optic wavelength multi-tasking on performance and benefit, significant lifting will be arranged via the present invention.

Description of drawings

Fig. 1 shows known light wavelength division multiplexing synoptic diagram;

Fig. 2 shows constitutional diagram of the present invention;

Fig. 3 shows fiber-optic wire installation drawing of the present invention;

Fig. 4 is the ring face figure that shows fiber-optic wire of the present invention;

Fig. 5 shows different fiber arrangement synoptic diagram of the present invention;

Fig. 6 is the light loss comparison diagram that shows different fiber arrangement mode of the present invention;

Fig. 7 shows index path of the present invention ();

Fig. 8 shows index path of the present invention (two);

Fig. 9 is the different embodiment that show optical fiber arrangements method of the present invention;

Figure 10 shows the embodiment of optical fiber arrangements method of the present invention in the lasso hole kenel of different fiber lead-in wire.

Among the figure

111 fiber-optic wires, 112 gradually changed refractive index lens

113 filter plates, 114 fiber-optic wires

115 incident end optical fiber, 116 reflection end optical fiber

117 penetration end optical fiber, 118 bonds

12 reflecting light wavelength division multiplexers, 121 fiber-optic wires

122 hollow pads, 123 lens

124 filter plates, 125 catoptrons

126 incident end optical fiber, 127 reflection end optical fiber

128 penetration end optical fiber, 129 bonds

2 light wavelength division multiplexings, 21 fiber-optic wires

211 lassos, 2111 ring faces

2112 holes, 212 fibre bundles

2121 incident end optical fiber, 21211 incident end fiber end faces

2122 reflection end optical fiber, 21221 reflection end fiber end faces

2123 penetration end optical fiber, 21231 penetration end fiber end faces

2124 idle optical fiber 213 bonds

22C shape lens 221C shape lens are cap sleeve fixedly

23 filter plates, 231 multilayer dielectrics are interfered plated film

24 optical mirrors, 241 reflected coat layer

25 hollow pads, 26 inclination hollow pads

The fine nuclear of the high point of A C incident end optical fiber

I incident wave band J reflected waveband

K penetrates wave band

Fine nuclear of O incident end optical fiber and the fine nuclear of reflection end optical fiber apart from mid point

The fine nuclear of P penetration end optical fiber

The fine nuclear of R reflection end optical fiber

T lasso central point

Embodiment

Following conjunction with figs. is described further embodiments of the present invention.

With reference to Fig. 2, be depicted as constitutional diagram of the present invention, this light wavelength division multiplexing 2 comprises:

One fiber-optic wire 21, one column C shape lens 22, one C shape lens are cap sleeve (cap) 221 fixedly, one surface has the filter plate 23 that multilayer dielectric is interfered plated film 231, one surface has the optical mirror 24 of reflected coat layer 241, the hollow pad 25 of relative position between fixed lens and fiber-optic wire 21, fixedly filter plate 23 and optical mirror 24 between relative position and inclination hollow pad 26 (spacer) with an angle [alpha], this fiber-optic wire 21 comprises a lasso 211 and fibre bundle 212.Fibre bundle 212 comprises incident end optical fiber 2121, reflection end optical fiber 2122, penetration end optical fiber 2123.

Above-mentioned C shape lens 22, the lens of also available other tool focusing effect replace, as non-spherical lens (aspheric lens) etc.

All do to cohere with bond 213 between each assembly and assembly, drawing does not show.And an end that joins of the lasso 211 of fiber-optic wire 21 and C shape lens 22 all is processed into and has a face with respect to YOX plane 8 degree angles, the purpose of the dip plane at this 8 degree angle is when avoiding incident light vertical incidence C shape lens 22, the light that has few part reflection can be got back on the optical fiber of original incident via original route, and causes the signal of light source to disturb.

Fine clothing layer (fiber cladding) diameter of general single-mode fiber (single mode fiber) is 125 μ m, and fine stratum nucleare (fiber core) diameter is 8.3 μ m.See also Fig. 3 and Fig. 4, be depicted as the ring face figure of fiber-optic wire installation drawing of the present invention and fiber-optic wire, be to utilize lasso 211 made end faces to have 8 fiber-optic wires of spending angles with square aperture, lasso inside aperture shape also can be rectangle or other shape with receiving optical fiber bundle 212, this fibre bundle 212 comprises incident end optical fiber 2121, reflection end optical fiber 2122, penetration end optical fiber 2123 and idle optical fiber 2124, above-mentioned optical fiber inserts in the fiber-optic wire 21, and at the different end faces of ring face 2111 formation, be respectively incident end fiber end face 21211, reflection end fiber end face 21221 and penetration end fiber end face 21231, in each end face, its fine nuclear (Core) position is respectively the fine nuclear of incident end optical fiber C, reflection end optical fiber fine nuclear R and the fine nuclear of penetration end optical fiber P, when each optical fiber inserts the central square aperture 2112 of lasso 211, fix each optical fiber with bond 213.

In the use, idle optical fiber 2124 is not done the transmission or the reception of light signal, so the optical fiber of its rear end can be wiped out.

See also Fig. 2, Fig. 3 and Fig. 4, when these light wavelength division multiplexing 2 operations, the light signal I of plural at least different-waveband wavelength is (as λ 1, λ 2, λ 3) enter from incident end optical fiber 2121, meaning is that light can be from the fine nuclear of the incident end optical fiber C outgoing of incident end fiber end face 21211, behind C shape lens 22, non-is that multilayer dielectric on the filter plate 23 interferes plated film 231 transparent light (as λ 2, λ 3), when filter plate 23, be reflected, focus on the fine nuclear of the reflection end optical fiber R position of reflection end fiber end face 21221 via C shape lens 22 again, guide away by reflection end optical fiber 2122.

The wavelength (as λ 1) that multilayer dielectric on can filtered 23 interferes plated film 231 to filter, on the optical mirror 24 that penetrates its rear of arrival, filter plate 23 back, reflected coat layer 241 on this optical mirror 24 is with the light reflected back filter plate 23 of this wave band, penetrate and carry out secondary filtering, focus on the fine nuclear of the penetration end optical fiber P position of penetration end fiber end face 21231 via C shape lens 22 then, guided away by penetration end optical fiber 2123, this penetrates wavelength (λ 1) through twice filtering behavior.

This light signal wavelength band through twice filter action has compared to the light signal of a filter action the isolated degree of higher adjacent channel is arranged, and can reach more than the 50dB.

Because four optical fiber are tight arrangement modes in the square aperture 2112 of lasso 211, so four the optical fiber relative position can be fixed on four corners of hole, and closely arrange, so distance in twos and relative angle are fixed, utilize bond 213 that optical fiber is fixed in the lasso 211 again, it is loosening that therefore fiber position can't take place.Because lasso 211 1 ends have 8 degree angle lapping splay ends, if the tip point with the longest edge of the beveled end of lasso 211 is the A point, in Fig. 4, the A point is defined in square aperture 2112 above, fiber configuration mode on the illustrated in the present embodiment fiber-optic wire 21 is: the fine nuclear of incident end optical fiber C is in the lower left of square aperture 2112, the fine nuclear of reflection end optical fiber R is in the upper right side of square aperture 2112, the fine nuclear of penetration end optical fiber P is on the upper left side of square aperture 2112, and idle optical fiber 2124 is then in the lower right of square aperture 2112; The purpose of An Paiing is like this, makes fine nuclear location R online of the fine nuclear location P of penetration end optical fiber 2123 and reflection end optical fiber 2122, online mutual vertical with height point A on the lasso 211 long limits and lasso central point T.Because work as reflected waveband J (as λ 2, λ 3) and penetrate waveband K (as λ 1) after filtration must optically focused on the hole 2112 of lasso 211 time after 24 reflections of wave plate 23 and optical mirror through C shape lens 22, the light beam behavior of this moment is to be convergence (converging), the necessary position simultaneously of reflection end optical fiber fine nuclear R and the fine nuclear of penetration end optical fiber P is on C shape lens 22 rear same positions at this moment, this position is near focus (focus point), could obtain the best light source coupling of penetration end and reflection end simultaneously, therefore if the fine nuclear location R of the fine nuclear location P of penetration end optical fiber 2123 and reflection end optical fiber 2122 online, online mutual vertical with height point A on the long limits of lasso 211 and lasso central point T, reflected waveband J light source and penetrate the distance that the waveband K light source advances equate in lens then, we can obtain reflection end fiber end face 21221 simultaneously and penetration end fiber end face 21231 is last with respect to the distance that C shape lens 22 all focus on the best simultaneously, so the insertion of reflection end and penetration end loss can reach minimum value simultaneously.

In addition, concerning penetrating waveband K (as λ 1), penetrate the incident angle (incident angle) of waveband K when penetrating filter plate 23 for the first time, and the incident angle when penetrating filter plate 23 for the second time must be identical; Because the incident angle influence penetrates the wavelength band of light, if incident angle is bigger, penetrate the inclined to one side S-band of wavelength band of light, if incident angle is less, penetrate the inclined to one side L-band of wavelength band of light, if penetrate for the first time light and penetrate the incident angle difference of light for the second time, then pin is weak and too narrow and do not apply and use mutually through penetrating wavelength band width behind the filter plate 23 for twice.

Therefore, the incident angle when penetrating for twice in order to meet is identical, optical fiber arrangements method of the present invention, and incident end optical fiber 2121, reflection end optical fiber 2122 with the relevant position of penetration end optical fiber 2123 on ring face 2111 are:

On the ring face 2111 of fiber-optic wire 21, the mid point O of incident end optical fiber fine nuclear C and the fine nuclear of reflection end optical fiber R is to the distance of the fine nuclear of incident end optical fiber C, need equal the distance of the mid point O of incident end optical fiber fine nuclear C and the fine nuclear of reflection end optical fiber R to the fine nuclear of penetration end optical fiber P, promptly CO is apart from equaling the PO distance.Can make that through arrangement mode thus the incident angle when penetrating for the first time and penetrating for the second time is identical, so the wavelength band that penetrated for twice behind the filter plate 23 is identical, so the wavelength band width can be by a little less than the pin mutually.

In sum, desire to make the wavelength band that penetrated for twice behind the filter plate 23 identical, and the insertion of reflection end and penetration end loss can minimum optical fiber arrangements mode be:

On the ring face 2111 of fiber-optic wire 21, the mid point O of incident end optical fiber fine nuclear C and the fine nuclear of reflection end optical fiber R need equal the distance of the mid point O of incident end optical fiber fine nuclear C and the fine nuclear of reflection end optical fiber R to the fine nuclear of penetration end optical fiber P to the distance of the fine nuclear of incident end optical fiber C.And the fine nuclear of penetration end optical fiber P and the fine nuclear of reflection end optical fiber R's is online, online mutual vertical with height point A on the lasso 211 long limits and lasso central point T.

See also Fig. 5, be depicted as void shape in the different fiber lead-in wire lasso to the arranged mode of optical fiber, we define the height point A point top in the drawings on the lasso 211 long limits of fiber-optic wire 21; The hole 2112 of the lasso 211 among Fig. 5 A is shaped as the square that can hold four optical fiber, when the position of the fine nuclear of incident end optical fiber C, the fine nuclear of penetration end optical fiber P, the fine nuclear of reflection end optical fiber R and the layout position among Fig. 3 not simultaneously, though the distance of CO equals the distance of PO, the incident angle when promptly it penetrates for the first time and penetrates for the second time is identical; But because penetration end optical fiber fine nuclear P and reflection end optical fiber fibre are examined the online of R, not with the long limit of lasso on height point A and lasso central point T online mutual vertical, expression reflection end optical fiber fine nuclear R and the fine nuclear of penetration end optical fiber P to C shape lens 22 at different position optically focused, and reflected waveband J light source and to penetrate the distance that the waveband K light source advances in C shape lens 22 different, therefore when reflection end is coupled to minimum insertion loss, penetration end can't be coupled to optimum value, penetration end and reflection end can't be coupled to optimum value simultaneously, so penetration end insertion loss is bigger.

The hole 2112 of the lasso among Fig. 5 B is shaped as the equilateral triangle hole that can hold three optical fiber, the hole 2112 of the lasso among Fig. 5 C is shaped as the long round hole that can hold three optical fiber, fibre bundle 212 on these two kinds of lassos 211 is at hole 2112 position arrangements, when being applied on our the optics framework of light wavelength division multiplexing 2, the fibre nuclear R that reflection end optical fiber 272 arranged first and the fibre nuclear P position of penetration end optical fiber 273 online not with lasso 211 long limits on height point A and lasso central point T online mutual vertical, make penetration end and reflection end can't be coupled to optimum value simultaneously, and cause the high loss of inserting; Another is the distance of the distance of CO and PO and inequality, penetrating the incident angle of waveband K when penetrating filter plate 23 for the first time and for the second time penetrating filter plate 23 can be not identical, and cause the too narrow and problem that can't use of wavelength band width, therefore to arrange be not best choice to these optical fiber holes 2112 in Fig. 5.

See also Fig. 6, angle difference and light loss comparison diagram when being depicted as optical fiber arrangements mode of the present invention and other different fiber arrangement mode twice and penetrating filter plate, this is the supplementary notes of Fig. 5.Optical fiber arrangements mode among this figure is described earlier, be all with the height point A of lasso 211 definition top in the drawings, by among the figure as can be known, when if the arrangement mode of optical fiber in lasso 211 is long round hole shape or triangle hole shape, its incident for the first time is respectively 3.67 degree and 1.34 degree with the angle difference Δ α of incident for the second time, this angle difference makes the wavelength band difference when penetrating filter plate 23 twice, has reduced whole wavelength band width of going out in 2123 outgoing of penetration end optical fiber; Examine online that R orders because penetration end optical fiber fine nuclear P point and reflection end optical fiber are fine in addition, not with lasso 211 long limits on height point A and lasso central point T online mutual vertical, make that the insertion loss of penetration end and the discrepancy delta IL of optimum value are respectively 0.25dB and 0.10dB when reflection end is coupled to the best insertion loss; In addition, if the arrangement mode of optical fiber in lasso 211 is square, the 3rd arrangement mode as Fig. 6, if arrangement mode not according to the invention, though the fine nuclear of its incident end optical fiber shown on figure C equals the fine nuclear of penetration end optical fiber P to the distance apart from mid point O to the distance apart from mid point O, but it is online that penetration end optical fiber fine nuclear P point and the fine nuclear of reflection end optical fiber R are ordered, not with lasso 211 long limits on height point A and lasso central point T online mutual vertical, so reflection end and penetration end can't be simultaneously under the optimum coupling states, and causing extra height to insert loss, the insertion loss of penetration end and the discrepancy delta IL of optimum value are 0.25dB; When if the arrangement mode of optical fiber in lasso 211 be square, and during according to optical fiber arrangements mode of the present invention, Δ α is 0, and Δ IL also is 0, represents quite good in the use via optical fiber arrangements mode of the present invention.

We are according to the fiber position arrangement mode among Fig. 4, in assembling during as the light wavelength division multiplexing 2 of Fig. 2, after incident wave band I light source enters from incident end optical fiber 2121, the insertion loss of the coupled reflection wave band J of elder generation light source, when the insertion loss of reflected waveband J is coupled to minimum value, earlier with filter plate 23, relative position between C shape lens 22 and fiber-optic wire 21 is fixing with bond 213, next to be coupled then and penetrate the waveband K light source to penetration end optical fiber 2123 time, at this moment, want to make and penetrate waveband K and be coupled on the penetration end optical fiber 2123, optical mirror 24 fixed angle α that must tilt then, the mode of this angle of inclination number and optical fiber arrangements and employed lens type and lens parameter are relevant, angle [alpha] can be 0.5 and spends to 4.0 degree, when tilting this angle, could will penetrate the waveband K light source and direct among the fine nuclear of the penetration end optical fiber P, and the minimum that obtains penetration end is inserted loss.

See also Fig. 7 and Fig. 8, be depicted as index path of the present invention () and index path (two), index path (two) is another visual angle for index path ().When incident wave band I (as λ 1, λ 2, λ 3) incident filter plate 23, penetrate waveband K (as λ 1) once by the interference plated film 231 on the filter plate 23, then on the reflection plated film 241 of optical mirror 24, be reflected, pass through the interference plated film of a filter plate 23 again, and reflected waveband J (as λ 2, λ 3) can't interfere plated film 231 to be reflected by the wave band of the interference plated film 231 on the filter plate 23.

Inclination hollow pad 26 in the drawings is exactly a gasket ring with angle [alpha], and the material of pad preferably selects thermal expansivity the smaller the better, can be between 0 * 10-6/ ℃ to 25 * 10-6/ ℃, and the influence when avoiding temperature variation.Fig. 7 and Fig. 8 be respectively vertical view (if by the cassette coordinate be defined as by initial point past+view that the Y direction is looked) with front elevation (if being defined as by+view that X is looked toward the initial point direction) by the cassette coordinate, from the direction of Fig. 7, can see inclination hollow pad 26 angle [alpha] among the figure; If when utilizing the bond 213 of a ultraviolet light photopolymerization resin (UV curing adhesive) or epoxy resin (epoxy) class to do to cohere between optical mirror 24 and filter plate 23, because the thermal expansivity (thermal expansion coefficient) of general bond 213 is all very big, so concerning the performance (performance) of product, it inserts the susceptibility that loses temperature can be very big; So, we select utilization to have angle [alpha] and its thermal expansivity is little, and its thickness can be very not thick yet inclination hollow pad 26, the centre of during assembling waist (beam waist) set positions being interfered the high reflected coat layer 241 on plated film 231 and the optical mirror 24 at the multilayer dielectric on the filter plate 23, this is because incident wave band I examines C incident from incident end optical fiber fibre, and the fine nuclear of incident end optical fiber C position is on the focus that is similar to C shape lens 22, behind the incident wave band I process C shape lens 22, this moment, light source was incident upon on filter plate 23 and the optical mirror 24 with the kenel that is similar to directional light, at this moment, when we interfered plated film 231 to place on the waist multilayer dielectric on the filter plate 23, the best that obtains reflection end that then can be coupled was inserted loss; If when placing the reflected coat layer on the optical mirror 24 241 on the waist, the best that then can obtain penetration end is inserted loss.But, because light source herein is the kenel that is similar to directional light, therefore no matter be multilayer dielectric interfere plated film 231 or reflected coat layer 241 in the offset of OZ axle concerning inserting loss, its influence is minimum, so its influence is minimum concerning the insertion of penetration end and reflection end is lost.In addition because the thermal expansivity of this tool angle hollow pad 26 is very little, make filter plate 23 and optical mirror 24 between angle when temperature variation, can not change too greatly, it inserts loss can be quite little to the susceptibility of temperature.

See also Fig. 9, A, B, C are optical fiber arrangements modes different on the ring face 2111 of fiber-optic wire 21 with D among Fig. 9, and the different embodiment of optical fiber arrangements method according to the invention can be seen in the height point A of lasso 211 signal top in the drawings wherein among the figure.

Be noted that in addition, when using different fiber-optic wires 21, as long as being enough to hold, the shape of lasso 211 central hole 2112 of this fiber-optic wire 21 and size comprise three fiber position such as incident end optical fiber 2121, reflection end optical fiber 2122 and penetration end optical fiber 2123 at least, meet optical fiber arrangements mode of the present invention simultaneously, also can be applicable to practical range of the present invention.

See also Figure 10, the shape and the size that are depicted as lasso 211 central hole 2112 of different fiber-optic wire 21 are held the different embodiment that comprise incident end optical fiber 2121, reflection end optical fiber 2122 and penetration end optical fiber 2123 at least, lasso 211 its holes 2112 of Figure 10 A are shaped as two rectangles, lasso 211 its holes 2112 of Figure 10 B are shaped as ellipse, lasso 211 its holes 2112 of Figure 10 C are shaped as rectangle, lasso 211 its holes 2112 of Figure 10 D are shaped as right-angle triangle, and lasso 211 its holes 2112 of Figure 10 E are shaped as two avette.

By among Figure 10 as can be known, as long as hole 2112 kenels of different lassos 211 can optical fiber arrangements method according to the invention, can both be applied to light wavelength division multiplexing 2 of the present invention, optical fiber arrangements method according to the invention still has many arrangement modes unlisted.

Above description, analyzed the characteristic of the part optical module of light wavelength division multiplexing 2, the arrangement mode that comprises optical fiber in the fiber-optic wire 21, penetrate wave band I and reflected waveband J in adding and taking light wave filter 2, advance behavior, the improvement of between filter plate 23 and optical mirror 24, inserting 26 pairs of properties of product of inclination hollow pad of a tool angle [alpha] in addition in addition.But the above in order to explain preferred embodiment of the present invention, is not that attempt is done any pro forma restriction to the present invention according to this only.Thereby allly do relevant any modification of the present invention or change in that identical creation spirit is following, be all the present patent application claim and contain.

Claims (9)

1. light wavelength division multiplexing is characterized in that optical device comprises:

One fiber-optic wire comprises lasso and fibre bundle;

This lasso one end has the end face at angle of inclination;

The beveled end of this lasso connects a hollow pad, and this hollow pad other end connects lens;

The other end at described lens connects a filter plate through lens locking cap cover;

This filter plate other end connects inclination hollow pad, and this inclination hollow pad connects an optical mirror again;

The fibre bundle of this fiber-optic wire comprises incident end optical fiber, penetration end optical fiber and reflection end optical fiber at least, and this fibre bundle inserts described lasso and fixes, and described each optical fiber inserts the position of lasso, is seen as from ring face:

The mid point of fine nuclear of incident end optical fiber and the fine nuclear of reflection end optical fiber equals the distance of the mid point of fine nuclear of incident end optical fiber and the fine nuclear of reflection end optical fiber to the fine nuclear of penetration end optical fiber to the distance of the fine nuclear of incident end optical fiber;

The fine nuclear location of penetration end optical fiber and reflection end optical fiber online, online mutual vertical with height point on the long limit of lasso and lasso central point.

2. light wavelength division multiplexing according to claim 1 is characterized in that:

Wherein the central authorities of the employed lasso of this fiber-optic wire establish a hole, and this hole is a square, and square aperture hollow scope wherein only can be held 4 optical fiber.

3. light wavelength division multiplexing according to claim 2 is characterized in that:

The central authorities of the lasso of this fiber-optic wire establish a hole, and this hole system is a kind of by circle, rectangle, ellipse, two rectangle, two avette or group that triangle is formed, and the described hole size is enough to hold three above optical fiber.

4. light wavelength division multiplexing according to claim 1 is characterized in that:

These lens are column C type lens.

5. light wavelength division multiplexing according to claim 1 is characterized in that:

These lens are non-spherical lens.

6. light wavelength division multiplexing according to claim 1 is characterized in that:

The suitable optical wavelength range of this optical mirror 500nm to 1800nm between.

7. light wavelength division multiplexing according to claim 1 is characterized in that:

Two planes of this inclination hollow pad, a plane has the angle of an inclination, and the angular range of inclination is spent between 4.0 degree 0.5.

8. according to claim 1 or 7 described light wavelength division multiplexings, it is characterized in that:

This inclination hollow pad thermal expansivity scope is between 0 * 10-6/ ℃ to 25 * 10-6/ ℃.

9. the optical fiber arrangements method of the fiber-optic wire of a light wavelength division multiplexing, fibre bundle inserts in the lasso of fiber-optic wire, and this fibre bundle comprises incident end optical fiber, penetration end optical fiber and reflection end optical fiber at least, from the ranking method of this fibre bundle of ring face is:

The mid point of fine nuclear of incident end optical fiber and the fine nuclear of reflection end optical fiber need equal the distance of the mid point of fine nuclear of incident end optical fiber and the fine nuclear of reflection end optical fiber to the fine nuclear of penetration end optical fiber to the distance of the fine nuclear of incident end optical fiber;

The fine nuclear location of penetration end optical fiber and reflection end optical fiber online, online mutual vertical with height point on the long limit of lasso and lasso central point.

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