WO2003075063A1 - A kind of tunable st connector and tuning process - Google Patents

A kind of tunable st connector and tuning process Download PDF

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Publication number
WO2003075063A1
WO2003075063A1 PCT/CN2002/000171 CN0200171W WO03075063A1 WO 2003075063 A1 WO2003075063 A1 WO 2003075063A1 CN 0200171 W CN0200171 W CN 0200171W WO 03075063 A1 WO03075063 A1 WO 03075063A1
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WO
Grant status
Application
Patent type
Prior art keywords
tunable
end
ring
backbone
flange
Prior art date
Application number
PCT/CN2002/000171
Other languages
French (fr)
Inventor
Koon Chu Chan
Original Assignee
Optec Technology Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/36Mechanical coupling means
    • G02B6/38Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807Dismountable connectors, i.e. comprising plugs
    • G02B6/3833Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3851Ferrules having keying or coding means
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/36Mechanical coupling means
    • G02B6/38Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807Dismountable connectors, i.e. comprising plugs
    • G02B6/3833Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3834Means for centering or aligning the light guide within the ferrule
    • G02B6/3843Means for centering or aligning the light guide within the ferrule with auxiliary facilities for movably aligning or adjusting the fibre within its ferrule, e.g. measuring position or eccentricity
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/24Coupling light guides
    • G02B6/36Mechanical coupling means
    • G02B6/38Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807Dismountable connectors, i.e. comprising plugs
    • G02B6/3898Tools, e.g. handheld; Tuning wrenches; Jigs used with connectors, e.g. for extracting, removing or inserting in a panel, for engaging or coupling connectors, for assembling or disassembling components within the connector, for applying clips to hold two connectors together or for crimping

Abstract

The present invention relates to a tunable ST connector for use in optical fibre communication, as well as tuning process by means of the same. In prior art ST connectors, as the position of a ferrule with respect to a locating key is fixed and non-adjustable, insertion loss and rejection rate in production are high. In the present invention, instead of a prior art ferrule, a tunable ring and a backbone are used, which can engage and disengage, so that by means of a special tool the tunable ring can be rotated, moving to a multiple of adjustment points, to find an optimal point, thus greatly increasing the concentricity during butting of connectors, and hence, also lowering insertion loss and enhancing the transmission efficiency of optical communication.

Description

A Kind of Tunable ST Connector and Tuning Process

Field of the Invention

The present invention relates to a connector for use in optical fiber communication, particularly a tunable ST connector, as well as a tuning process by means of the same.

Background of the Invention

In all prior art ST connectors having a zirconia ferrule, after assembly, the position of a ferrule with respect to a locating key is fixed and not adjustable. Concentricity error, if any, will therefore lead to a high insertion loss, and nothing could be done to improve it. Inasmuch, the common deficiencies of the prior art products lie in a high insertion loss, an unstable product quality, and a high reject rate of products. As is common knowledge, when two connectors are butted, the concentricity of optical fiber at both ends is what counts first, as may cause an insertion loss. Therefore, there is a very high requirement as respects the concentricity of ferrules, which increases the difficulty, as well as the cost, of production.

The object of the present invention is to provide a new and original tunable ST connector, to overcome all the above-said prior art shortcomings, and to lower the insertion loss when ferrules are butted; so that a very satisfactory butting effect can be obtained under only ordinary machining accuracy. Another object of the present invention is to provide a tuning process, to ensure the assembling quality of optical fiber communication lines during butting of connectors.

Summary of the Invention

The tunable ST connector according to the present invention comprises a plastic boot, a crimp ring, a coupling nut, and a dust cap, wherein, instead of a commonly used ferrule in the prior art, there are provided a metal backbone which can revolve round its centre line and a tunable ring, said backbone having at one end an internal round hole into which a ferrule may be inserted, and a flange formed at the same end; while at the other end, there is provided a second internal round hole for optical fibre to go through. The said tunable ring is just fit to be slipped over one end of the said backbone to be held on the said flange. Said flange and said tunable ring are further provided with mutually engaging structural means so that, with the help of an elastic means, the two are constantly engaged. If a special tuning adjustment tool is used to push and rotate the said tunable ring, depending on adjustment of the relative location between the said backbone and the said tunable ring and by means of related instruments, it is possible to find an optimal location, where two butting connectors reach an optimal concentricity and best transmission of optical signals is ensured.

In one embodiment of the present invention, the said flange comprises several notches, and the said tunable ring is provided on its internal side with a stepped edge just for the said flange to rest on; at the end of the tunable ring facing the flange, there are formed inwardly extending lugs just to engage with the said notches formed in the said flange. Moreover, the tunable ring is further provided with slots in its outer surface, so as to match corresponding hogs formed in one end of a tuning adjustment tool, to realize adjustment. The number of the said notches in the flange of the backbone can be between 2 and 24, so as to optimize concentricity adjusting results (Figure 4 shows six notches, just as an example). The elastic means to help engage the said backbone flange and the said tunable ring can be a spring, which is seated upon a C-ring fitted into a slot in the said backbone, while its other end just rests upon the base end of the said tunable ring. In this way, it makes possible to tune the said ring into several positions, ranging from 2 to 24, to find the optimal concentricity adjustment.

The tunable ST connector according to the present invention further comprises a special tuning adjustment tool, knurled at one end on the circumference and having at the other end hogs just to match with the said slots formed in the outer surface of the said tunable ring, so as to facilitate adjustment. The number of the said hogs depends on need.

The present invention further relates to a taring process used when two optical fibre connectors are butted; said process comprising: To find by means of instruments an optimal concentricity; to insert the tuning adjustment tool, so that the hogs at its one end engage into the corresponding slots provided in the said tunable ring; then push and rotate the said tool, to first disengage the said tunable ring from the said backbone, try all subsequent adjustment points until an optimal point is reached, then engage them.

The tunable ST connector according to the present invention has the following advantages in comparison with prior art products: Tuning steps can be 2 to 24, each step corresponding to a rotation by 180° to 15°; therefore an optimal concentricity in butting ferrules can be reached; hence, quality acceptance ratio of the ST connector production is also much raised; requirement as to concentricity accuracy of ferrules is thus lowered. Experiments show that the UPC end insertion loss of the tunable ST connector according to the present invention is =≤0.15 dB. Brief Description of the Drawings

The above and other objects of the present invention, as well as its various advantages, will be clearly seen in the following description in connection with the accompanying drawings, in which:

Figure 1 is an exploded assembly illustration of the tunable ST connector according to the present invention;

Figure 2 is an illustration of a tunable ring in the tunable ST connector according to the present invention;

Figure 3 is the above-mentioned tunable ring as viewed from another angle;

Figure 4 is an illustration of a metal backbone of the tunable ST connector according to the present invention;

Figures 5 and 6 show each an illustration of assembly of the said tunable ring and the said metal backbone of the tunable ST connector according to the present invention; and

Figure 7 is an illustration showing a tuning adjustment tool used for the tunable ST connector according to the present invention.

Detailed Description of an Embodiment

With reference to Figs. 1, 2, 3, 4, 5, the tunable ST connector according to the present invention comprises a plastic boot 9, a crimp ring 8, a coupling nut 2, and a dust cap 1, wherein instead of a prior art ferrule, there are provided a metal backbone 5 which can revolve round its center line and a tunable ring 4. Said backbone 5 has at its one end an internal round hole 51 for a ferrule 3 to insert and a flange 54 formed at the same end; at its other end, there is formed a second internal round hole 52 for optical fibre to go through. The said tunable ring 4 can be slipped over one end of the said backbone 5, just to rest on the said flange 54. The said flange 54 and the said tunable ring 4 are further provided with structural means for mutual engagement, so that the two are constantly engaged with the help of an elastic means.

Said backbone 5 is provided in its outer surface with an annular slot 53, for a C- ring 7 to fit in (see Figure 1); and as the said elastic means mentioned at the end of the foregoing paragraph, a spring 6 is used, which is slipped over the backbone 5, with its one end resting on the said C-ring 7 and the other end seated on the base end 44 of the said tunable ring 4 fitted over one end of the backbone 5.

Further, the said flange 54 comprises several notches 541, and the tunable ring 4 is provided on its internal side with a stepped edge 42; when the said tunable ring 4 is slipped over the said backbone 5, the said stepped edge 42 is just for the said flange 54 to rest on. At the end of the tunable ring 4 opposite to its base 44, there are formed inwardly extending lugs 41, to engage with the said notches 541 formed in the said flange 54. In addition, in the outer surface of the said tunable ring 4, there are formed slots 43, to match the corresponding hogs 101 formed at one end of a tuning adjustment tool 10, so as to facilitate adjustment.

In one embodiment according to the present invention, the said flange 54 possesses 6 notches 541, so that by means of the said special tuning adjustment tool 10, six different adjustment points can be tried to ensure optimal concentricity adjustment during butting of connectors.

The present invention also comprises a special tuning adjustment tool 10, which is provided with a knurled surface 102 at one end, while at the other end, there are formed hogs 101 matching the said slots 43 formed in the outer surface of the said tunable ring 4, so as to engage with the tunable ring for adjustment.

The present invention further comprises a process for concentricity adjustment during butting of optical fibre connectors, said process comprising: To find by means of instruments an optimal concentricity; to insert the tuning adjustment tool 10 so that the said hogs 101 fit into the said slots 43 in the said tunable ring 4; then push the said tool 10, so that the said tunable ring 4 and backbone 5 are disengaged; to turn the said tunable ring 4, trying all subsequent adjustment points, and finally to engage the tunable ring 4 and the backbone 5 again when an optimal concentricity is reached.

Claims

What is claimed is:
1. A tunable ST connector for use in optical fibre communication, comprising: a plastic boot, a crimp ring, a coupling nut, and a dust cap; a metal backbone which can revolve round its centre line, having at one end an internal round hole for a ferrule to be inserted, and a flange formed at the same end, said backbone being further provided at the other end with a second internal round hole for optical fibre to go through; a tunable ring, fit to be slipped over one end of the said backbone to be held on the said flange; and mutually engaging means provided in the said flange and the said tunable ring, which, with the help of an elastic means, are constantly engaged.
2. A tunable ST connector, as claimed in Claim 1, wherein the said flange formed at one end of the said backbone comprises several notches, and the said tunable ring is provided on its internal side with a stepped edge just for the said flange to rest on; and at the end of the tunable ring facing the said flange there are formed inwardly extending lugs to engage with the said notches formed in the said flange; and further, the said tunable ring is provided with slots in its outer surface for adjustment purposes.
3. A tunable ST connector, as claimed in Claims 1 or 2, wherein the said notches formed in the said flange of the said backbone may total in number between 2 and 24.
4. A tunable ST connector, as claimed in Claims 1 or 2, wherein the said backbone is provided in its outer surface with an annular slot for a C-ring to fit in, and a spring is provided, the one end of which is seated on the said C-ring while its other end rests upon the base end of the said tunable ring.
5. A tunable ST connector, as claimed in Claims 1 or 2, wherein further a special tuning adjustment tool is provided, comprising one knurled end, and a second end having hogs formed just to match with the said slots in the outer surface of the said tunable ring.
6. A tuning process for concentricity adjustment during butting of optical fibre connectors, comprising:
- to find by means of instruments an optimal concentricity; - to insert the said tuning adjustment tool, so that the said hogs at its one end engage into the corresponding slots provided in the outer surface of the said tunable ring;
- to push the said tool, so that the said tunable ring and the said backbone are disengaged;
- to turn the said tunable ring, trying all subsequent adjustment points and finally to engage the tunable ring and the backbone again when an optimal point is found.
PCT/CN2002/000171 2002-03-01 2002-03-15 A kind of tunable st connector and tuning process WO2003075063A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN 02106717 CN1442712A (en) 2002-03-01 2002-03-01 Regulatable ST type connecting head and its regulating method
CN02106717.1 2002-03-01

Publications (1)

Publication Number Publication Date
WO2003075063A1 true true WO2003075063A1 (en) 2003-09-12

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ID=27768507

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2002/000171 WO2003075063A1 (en) 2002-03-01 2002-03-15 A kind of tunable st connector and tuning process

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CN (1) CN1442712A (en)
WO (1) WO2003075063A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100424534C (en) 2006-04-14 2008-10-08 中国科学院半导体研究所 Optical fiber jiggle induction device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5212752A (en) * 1992-05-27 1993-05-18 At&T Bell Laboratories Optical fiber ferrule connector having enhanced provisions for tuning
CN1175002A (en) * 1996-07-15 1998-03-04 精工电子工业株式会社 Universal optical fibre connector and basic pluger
CN1280305A (en) * 1999-07-08 2001-01-17 莫列斯公司 Adjustable optic fibre connector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5212752A (en) * 1992-05-27 1993-05-18 At&T Bell Laboratories Optical fiber ferrule connector having enhanced provisions for tuning
CN1175002A (en) * 1996-07-15 1998-03-04 精工电子工业株式会社 Universal optical fibre connector and basic pluger
CN1280305A (en) * 1999-07-08 2001-01-17 莫列斯公司 Adjustable optic fibre connector

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Publication number Publication date Type
CN1442712A (en) 2003-09-17 application

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