TW521169B - Fiber collimator mixing fiber lens and ball lens - Google Patents

Abstract

A fiber collimator mixing fiber lens and ball lens comprises a single mode fiber, a fiber lens and a ball lens. Said fiber lens is installed on one side of the single mode fiber, and is connected to one end of the single mode fiber. Said ball lens is disposed on the same side of the fiber lens, and is in the same line as the single mode fiber and fiber lens, wherein the laser light is emitted from the single mode fiber toward the fiber lens, passes through the fiber lens and ball lens, and is focused behind the ball lens.

Description

Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 521169 6176twf.doc / 006 A7 B7 V. Description of the invention (z) In order to make the laser light emitted from a single-mode fiber collimated and reduce the volume of the component, for example, US patent US4737006 uses pure Pure Silica Rod and single mode fiber are fused first, then the pure sand rod is cut into a small section, and the end face of the pure sand rod is burned into a curved surface by heating. A pure silicon rod is a fiber lens. Fig. 1 shows a fiber collimator according to the above-mentioned conventional technology, in which symbols 1 to single-mode fiber, 2 to fiber lens, length of L to fiber lens 2, length of curvature of r to fiber lens 2, ns to fiber Refractive index of lens 2, 2WQ ~ light spot diameter when laser light is emitted from single-mode fiber 1, 2Wi ~ light spot diameter when laser light is emitted from fiber lens 2, P-light waist position (Beam Waist), 2WZ ~ since The diameter of the light spot at the optical waist position P at a distance Z from the end of the fiber lens, where Z is half the working distance when the two fiber collimators are coupled. The biggest disadvantage of the optical fiber collimator made in this way is that when two optical fiber collimators are coupled, the working distance is short, so it is difficult to insert other optical components to make the above-mentioned optical fiber communication components. Fig. 2 is a diagram showing the relationship between the fiber length L and Z of the conventional fiber collimator of Fig. 1 at r = 62.5pm. It can be seen from FIG. 2 that the maximum 値 of Z is about 293 μm, that is, the maximum working distance 2Z when two fiber lenses are coupled is about 586 μm. Fig. 3 is a graph showing the relationship between the optical fiber collimator of Fig. 1 and the optical fiber collimator at a length of? Fig. 4 is a graph showing the relationship between the spot diameter 2WZ and the fiber lens length L of the conventional fiber collimator of Fig. 1 at Γ = 70µΐΏ. In addition, if the US patent US4304461 uses ball lenses (Ball Lens) 4 This paper size is applicable to China National Standard (CNS) A4 specifications (210X297 mm) " '(Please read the precautions on the back before filling this page) Order 521169 A7 B7 6176twf.doc / 〇〇6 V. Description of the invention (3) To form a fiber collimator 'to be used as a fiber connector. Figure 5 shows the fiber collimator according to the above-mentioned conventional technology, in which symbols 1 ~ single-mode fiber, 3 ~ spherical lens, L ~ single-mode fiber 1 and the distance between the spherical lens 3, R ~ spherical lens 3 Radius of curvature, nB ~ refractive index of ball lens 3, light spot diameter when laser light is emitted from single-mode fiber 1, P-light waist (Beam Waist) position, light spot diameter when 2Wr ball lens 3 receives laser light 2WZ ~ the diameter of the light spot at the light waist position P at a distance Z from the end of the ball lens 3, where Z is also one and a half of the working distance. FIG. 6 is a diagram showing the relationship between the distance between the optical fiber and the ball lens of the conventional optical fiber collimator of FIG. 5 and Z. FIG. When a ball lens is used to make an optical fiber collimator, the larger the diameter of the ball lens, the longer the maximum working distance between the two fiber collimators when mated. Conversely, the smaller the diameter of the ball lens, the shorter the longest working distance when the two fiber collimators are coupled. That is, when the size of the fiber collimator is large, the longest working distance when the two fiber collimators are coupled is longer. On the contrary, the size of the fiber collimator is small, and the longest working distance when the two fiber collimators are coupled is short, so the two cannot be taken into consideration. In view of this, the main object of the present invention is to propose a fiber collimator with a hybrid fiber lens and a ball lens, which can not only reduce the size of the fiber collimator, but also can take into account the two fiber collimators when they are mated. Long working distance, so that additional optical components can be inserted to make a variety of different optical fiber communication components, such as: optical fiber isolators, high-density wavelength multiplexers, optical fiber attenuators, optical fiber circulators, etc., reducing the packaging of optical fiber communication components After the volume. In order to achieve the above and other objectives of the present invention, the mixed light of the present invention, 忏 5 paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 mm) 丨 —— · ---.----- ^^ Clothing-(Please read the precautions on the back before filling out this page) Ordered by the Consumer Standards Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs and printed by the Central Government Bureau of the Ministry of Economic Affairs. Note (4 ») The optical fiber collimator of a lens and a ball lens includes: a single-mode fiber, a fiber lens, and a ball lens. The above-mentioned fiber lens is provided on one side of the single-mode fiber and is connected to one end of the single-mode fiber. The ball lens is disposed on the same side of the fiber lens and is in line with the single-mode fiber and the fiber lens. One of the laser light is emitted from the single-mode fiber toward the fiber lens, passes through the fiber lens and the ball lens, and is focused on the ball. Behind the lens. The fiber collimator of the hybrid fiber lens and ball lens of the present invention has the advantage that a longer working distance can be obtained without increasing the volume. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings for detailed description as follows: Brief description of the drawings: FIG. 1 Figure 2 shows a schematic diagram of a conventional fiber optic collimator with conventional fiber optic lenses. Figure 2 shows the relationship between the fiber length L and Z of the conventional fiber optic collimator at r2.5 μιη in Figure 1. Figure 3. Figure 3 shows the relationship between the 'light spot diameter 2WZ and the fiber lens length L of the conventional fiber collimator of Figure 1 at r = 62.5 | Llm; Figure 4 shows the first The conventional optical fiber collimator at ρ70μηι is a diagram showing the relationship between the light spot diameter 2WZ and the fiber lens length L; Figure 5 shows another conventional ball lens fiber collimator; Figure 6 shows the first Figure 5 is a graph showing the relationship between the distance L to Z between the fiber and the ball lens of the conventional fiber collimator. Figure 7 shows a hybrid fiber lens and ball 6 11 ·.-(Please read the precautions on the back before filling this page)

、 1T This paper size is in accordance with Chinese Standard (CNS) A4 specification (210 × 297 mm) 521169 6176twf.doc / 006 5. Description of the invention (5) Optical fiber collimator for lens; and Figure 8 shows Figure 7 The relationship between the distance Z1 + La to Z2 between the fiber lens and the ball lens of the fiber collimator. Explanation of symbols: 1-single-mode fiber; 2 -fiber lens; 3-spherical lens; 4 -single-mode fiber core (c 〇 r e);

Pi-first optical waist position; P2-second optical waist position; L-length of fiber lens; r-curvature radius of fiber lens; ns-refractive index of fiber lens; nB-refractive index of ball lens; 2W0 -Light spot diameter when laser light is emitted from single-mode fiber; 2W "diameter of light spot when laser light is emitted from fiber lens; 2W2-light spot diameter of laser light at first optical waist position; consumption by employees of the Central Standards Bureau of the Ministry of Economic Affairs Cooperation, printed by Du (please read the precautions on the back before filling out this page) 2W3- The diameter of the light spot when the laser light enters the ball lens; 2W4- The diameter of the light spot when the laser light exits the ball lens; 2WZ- laser light The diameter of the light spot at the second optical waist position; A-the distance between the end face of the optical fiber lens and the first optical waist position; and Z2- the distance between the end face of the ball lens and the second optical waist position. ) A4 specification (210X297 mm) 521169 6 1 7 6 twf. D oc / 0 0 6 A 7 B7 V. Description of invention (office) Example Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the back page first) Note to fill out this page again} Referring to FIG. 7, it shows a fiber collimator of a hybrid fiber lens and a ball lens according to the present invention. The fiber collimator of a hybrid fiber lens and a ball lens according to the present invention includes: a single-mode fiber 1, a fiber Fiber lens 2 and Ball Lens 3. The fiber lens 2 can be a Pure Silica Rod with a curved surface at one end, or a step-index multimode fiber with a curved surface at the ~ end ( step index multi mode fiber), or one end is a graded index multi mode fiber. The refractive index of fiber lens 2 is ns (for example: 1.468), the radius of curvature is r (for example: 62 · 5μηι), The length is L (for example: 409 μm), which is arranged on one side of the single-mode fiber 1 and connected to one end of the single-mode fiber 1. The refractive index of the ball lens 3 is ηB (for example: 1.45) and the radius is R (for example, 200 μm) ), Which is located on the same side of the optical fiber lens 2 and is in line with the single-mode optical fiber 1 and the optical fiber lens 2. As shown in FIG. 7, a laser light having a wavelength of λ (for example, 1.55 μm) is emitted from the single-mode optical fiber. 1 shoots out and penetrates the fiber lens 2 and the ball in order Behind the mirror 3, focus behind the ball lens 3. The beam spot diameter (Beam Spot Diameter) when the laser light is emitted from the single-mode optical fiber 1 is 2W0 (for example, 10.5 μηι), and the laser light when the laser light is emitted from the fiber lens 2. The light shift point diameter is 2W !. One of the first optical waist positions at a distance of 21 (for example: 240.53b1! 1) from the end of the fiber lens 2? The diameter of the light spot on 1 is 2W2 (for example, 9.02 μm), and the diameter of the light spot on the second optical waist position ρ2 at a distance of ZO2 (for example, 1381.97 μm) from the point where the laser light exits from the ball lens 3 For 2WZ. The above-mentioned Z2 is the working distance between the hybrid fiber lens and the ball lens fiber collimator of the present invention (Working 8 This paper size is applicable to the Chinese National Standard (CNS) A4 specification (21〇 > < 297mm) 521169 6176twf.doc / 0〇6 B7 V. Description of the invention (7) (Please read the precautions on the back before filling this page)

Distance). In addition, the symbol La represents the distance between the first optical waist position P1 and the ball lens 3 (eg, 163 · 47 μηι), 2W3 represents the diameter of the light spot when the ball lens 3 receives the laser light, and 2W4 represents the laser light exiting the ball lens Light spot diameter at 3 o'clock. In the optical fiber collimator of the hybrid fiber lens and ball lens of the present invention, the light spot diameter 2W2 emitted from the fiber lens 2 can be changed by adjusting the length L and the curvature radius r of the fiber lens 2. By adjusting the relative distance between the fiber lens 2 and the ball lens 3, the waist position P2 of the light emitted by the fiber collimator can be changed. That is, Z2 can be changed to change the working distance 2Z2 when two fiber collimators are coupled. In addition, under the same spherical lens radius R, the smaller the spot diameter 2W2 emitted by the optical fiber lens 2 is, the farther the farthest waist position P2 that can be reached is, that is, the maximum Z2 is larger. In other words, the maximum working distance 2Z2 when two fiber collimators are coupled can be made longer without changing the volume of the fiber collimator. According to different needs, by changing the size 2W2 and the radius R of the ball lens 3, fiber collimators with different optical waist positions p2 and volumes can be designed, so that the volume of the fiber collimator can be reduced, and the working distance can be taken into account. Purpose. Printed by the staff of the Central Bureau of the Ministry of Economic Affairs on consumer cooperation. In addition, the ABCD matrix for the entire optical fiber collimator system of the present invention can be expressed as the following formula:] B_ CD = _1 Z / 0 1 " 1 0 1- %% ~ 1 2R-_0 1 _ _1 0 '1-heart 1 1 k 0 LR 1' 'jib—R ηΒ ·

'1 L 1 — heart ns 0 1 L r 1 J of which hZdLa 9 This paper size is applicable to China National Standard (CNS) A4 specification (210X 297 mm) 521169 ^ 176twf.doc / 006 A7 B7 Five

'Explanation of the invention (A fr, \ 2-heart 1 + 〔1-Ό k (2R (l-ns) t' {nB J 1 ^ J 2 (1-~) + 2 (1- ns) {\-nB ) k ^ (1 X2-"〇Rr rnr Β + ζ (ι- ~), M-(2-nB) k, 2R_ +% _ r _ --- 1-- _ nB nB _

2〇- ^ μ + nBR Ρ (1ι) 玛] 2 ^ -nB) k ι l-nB _ r _ nBR ηΒ ς, _2 {\-ηΒ) [2 {ί-η3 ^ [-η ^ ^ {^ '~ nB) ^-ns) naR naRr nnr

2 (l-nB) L

n0R + L (l-ns) r

2 {^-nB) k [2-nz nBR nB For simplicity, let A = e + fZ2 and B = g + hZ2, where 2 — / 7 r 1 + k 2R {l-ns) I. _ I m--11 — · ·---=--! __ (Please read the notes on the back before filling in this education) 2 (1- ~) i 2 (1- ~) (1 | (1-%) ( 2 1%)

nBR nBRr rnB g

• nB) L + h.

nBR + Z (l- ~) rL {\-ns)

{2-nB, k '2R --1-- 2 (l-nB) ki 2-n3 naR nD λ After printing and finishing by the staff consumer cooperative of the Central Standards Bureau of the Ministry of Economy, the working distance Z2 of the entire system can be expressed as : · Z2 =-(ae + a Dgl, where "

Cf + a2Dh 7msW: Figure 8 is a diagram showing the relationship between the distance Z1 + La to Z2 between the fiber lens and the ball lens of the fiber collimator in Figure 7, where the radius of the ball lens 3 is RdOOpm, Curvature radius ι · = 62 · 5μηι, length L =: 700pm. As shown in FIG. 8, the maximum Z 2 is 6525 μm. The optical fiber collimator in Fig. 5 has a maximum ball lens radius K = 200 µm, and its maximum Z is 1052 µm (as shown in Fig. 6), which is significantly shorter than the 6525 µm in the above example of the present invention. To sum up, the light of the hybrid fiber lens and ball lens of the present invention is 10. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 521169 A7 B7 6176twf.doc / 006 V. Description of the invention (9) Fiber The collimator not only has a significantly longer working distance than the conventional fiber collimator, but also does not increase the volume of the fiber collimator. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application. (Please read the notes on the back before filling out this page) Printed by the Central Government Bureau of the Ministry of Economic Affairs for consumer cooperation Printed on this paper The size of the paper applies to the Chinese National Standard (CNS) A4 (210X297 mm)

Claims (1)

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 521169 A8 ^ Β8 6176tWf.d0c / 0 06 SI__ VI. Application for patent scope 1. A fiber collimator with hybrid fiber lens and ball lens, including: single-mode fiber A fiber lens having a refractive index of ns and a radius of curvature of r ′ and a length of L, which is disposed on one side of the single-mode fiber and is connected to one of the ends of the mode-mode fiber; and a ball lens The ball lens has a refractive index of nB and a radius of R, which are arranged on the same side of the fiber lens and are in line with the single-mode fiber and the optical lens. One of the laser light (wavelength is λ) is from the single-mode fiber. The fiber is emitted, and penetrates the fiber lens and the ball lens in order. The diameter of the light spot when the laser light is emitted from the single-mode fiber is 2WQ, and the diameter of the light shift point when the laser light is emitted from the fiber lens is 2W! , The diameter of the light spot at a first optical waist position at a distance Z! From the end point of the fiber lens is 2W2, the distance between the first optical waist position and the ball lens is La, and the laser light from The distance from which the ball lens exits The diameter of the light spot at one of the 22 optical waist positions is 2WZ, and the distance Z2 is one and a half of the working distance when the two fiber collimators are coupled. 2. The fiber collimator of the hybrid fiber lens and spherical lens as described in item 1 of the patent application scope, wherein the fiber lens is a pure silicon rod with a curved surface at one end. 3. The fiber collimator for a hybrid fiber lens and a spherical lens as described in item 1 of the scope of the patent application, wherein the fiber lens is a step index multi mode fiber with a curved surface at one end. 4. The optical fiber collimator of the hybrid fiber lens and ball lens as described in item 1 of the scope of the patent application, wherein the fiber lens is a graded-refractive-index multimode fiber. This paper applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ------------------- Day Order --------- Line (Please read the notes on the back before filling this page) Ministry of Economic Affairs Intellectual Property Bureau employee consumer cooperation print 521169 A8 B8 6176twf.doc / 0 06_g_ VI. Patent application scope (graded index multi mode fiber) 0 5. The hybrid fiber lens and ball lens described in item 1 of the patent application scope 46. An optical fiber collimator, wherein the refractive index ns of the optical fiber lens is 1.46. 6. The optical fiber collimator of the hybrid optical fiber lens and the spherical lens according to item 1 of the scope of the patent application, wherein the optical fiber lens has a radius of curvature ι · = 62.5 μιη. .7. The optical fiber collimator of the hybrid fiber lens and the spherical lens according to item 1 of the scope of the patent application, wherein the length of the fiber lens is 409 μm. 8. The fiber collimator of the hybrid fiber lens and the spherical lens according to item 1 of the scope of the patent application, wherein the refractive index ηB of the spherical lens is 1.45. 9. The fiber collimator for a hybrid fiber lens and a spherical lens as described in item 1 of the scope of the patent application, wherein the radius of the spherical lens is K = 200 μm. 10. The optical fiber collimator of the hybrid fiber lens and the spherical lens as described in item 1 of the patent application scope, wherein the distance. 11. The fiber collimator of the hybrid fiber lens and the spherical lens as described in item 1 of the scope of the patent application, wherein the distance La = 163.47pm. 12. The optical fiber collimator of the hybrid fiber lens and the spherical lens as described in item 1 of the scope of the patent application, wherein the working distance Z2 = 1381.97 μιη. 13. A fiber collimator with a hybrid fiber lens and a ball lens, comprising: a single-mode fiber; a fiber lens, the fiber lens being disposed on one side of the single-mode fiber and connected to one end of the single-mode fiber; And a ball lens, the ball lens is disposed on the same side of the fiber lens and is in line with the single-mode fiber and the fiber lens, and a laser light is emitted from the single-mode fiber toward the fiber lens and passes through the fiber lens With this ball 13 This paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page) ----- Line '521169 A8 B8 6176twf.doc / 006 C8 __ D8 6. After applying for a patent scope lens, focus on the back of the ball lens. 14. The fiber collimator of the hybrid fiber lens and ball lens as described in the 13th item of the Shen g patent, which is a pure silicon rod with a curved surface at one end. 15. The fiber collimator of the hybrid fiber lens and ball lens according to item 13 of the scope of the patent application, wherein the fiber lens is a step index multi mode fiber with a curved surface at one end. 16. The fiber collimator of the hybrid fiber lens and ball lens according to item 13 of the scope of the patent application, wherein the fiber lens is a graded index multi mode fiber. (Please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210 x 297 mm)