CN202433563U - Optical fiber expanded beam connector - Google Patents

Abstract

The utility model relates to an optical fiber expanded beam connector, comprising a plug and a socket. At least one collimator mounting hole is disposed at the same positions of the plug and the socket, collimators are disposed in the collimator mounting holes, optical fibers are filled in the collimators, a guide hole and a guide column are disposed both on the plug and the socket, and the guide holes are adaptive to the guide columns. The optical fiber expanded beam connector solves technical problems of conventional optical fiber expanded beam connectors that mounting is difficult, the surface of lens is not easy to clean and requirements for precision of mechanical parts are too high, transmission loss and precision of mechanical processing are reduced, and variation of insertion loss is small; non-contact connection of signals is realized, requirements for mechanical precision are reduced; and the connector has a simple structure, high reliability, long service life, high dustproof performance, and an easily cleaned surface.

Description

A kind of optical fiber beam expansion connector

Technical field

The utility model relates to the field of the joints of optical fibre, refers in particular to optical fiber beam expansion connector.

Background technology

The light transmission type formula of multi-channel optical fibre connector can be divided into two types: one is docking adapter, and one is extending type.The dock cost is lower, is present main connected mode, but at the scene clanability, the aspects such as susceptibility of dust are also had problem, because dust possibly damage the optical interface of dock connector.If on the optical interface dust granules is arranged, will interdict light signal, even damage optical interface dock connector and just can not work; Moreover the dock connector also can't be applicable to the field that vibration is frequent; Because dock connector optical fiber contacts with fiber end face, so receiving when vibrating, the end face of optical fiber constantly rubs; Can cause fiber end face impaired, increase the insertion loss of connector.

Only expand in the extending type connector and deliver to another connector again after the bundle back forms directional light through lens; So allow certain distance between connector, thereby improved the dust tightness and the also raising greatly of repeatability of clanability and replaceability, the connector of connector.The plug of beam expansion connector is to rely on guide posts and guide hole structure in addition, and their wearing and tearing are littler than the dock to the influence of inserting loss, and the life-span of beam expansion connector is generally more than 2500 or 3000 times, and the life-span of dock connector generally is about 500 times.

U.S. Pat 2009/0324175, a kind of optical fiber beam expansion connector has adopted globe lens, and installation difficulty strengthens, and lens surface is difficult for cleaning.

Chinese patent 201010213966.5 adopts ordinary optic fibre and GRIN Lens to form beam-expanding system, and too high to the accuracy requirement of mechanical parts, difficulty of processing is big.

Summary of the invention

Big in order to solve existing optical fiber beam expansion connector installation difficulty, lens surface is difficult for cleaning, to the too high technical matters of the accuracy requirement of mechanical parts, the utility model provides a kind of four-way optical fiber beam expansion connector.

The technical solution of the utility model:

A kind of optical fiber beam expansion connector; Comprise plug and socket, all be provided with at least one collimating apparatus mounting hole on the said plug and socket, be provided with collimating apparatus in the said collimating apparatus mounting hole in identical position; Be inlaid with optical fiber in the said collimating apparatus; Be provided with pilot hole and guidepost on the said plug and socket, said pilot hole and guidepost are suitable, it is characterized in that: said collimating apparatus is GRIN Lens, C lens (C-LENS) or non-spherical lens; Said optical fiber is conical fiber (taper fiber) and hot expanded core fiber (TEC fiber).

Above-mentioned collimating apparatus mounting hole is four, is provided with a pilot hole and a guidepost on the said plug and socket.

Above-mentioned optical fiber is conical fiber.

Above-mentioned guidepost and pilot hole adopt wringing fit.

Spacing 1-10mm between above-mentioned two collimating apparatuss.

The advantage that the utility model had:

1, the utility model adopts big mould field core diameter single-mode optical fiber, has reduced loss, has reduced the precision of machining, and guidepost and pilot hole adopt wringing fit, have high anti-seismic performance, and optical fiber does not contact during vibration, inserts loss and changes little.

2, the utility model is formed no inclined to one side collimating apparatus through adopting GRIN Lens and optical fiber, has realized that the noncontact of signal connects, and has reduced the requirement to mechanical precision.

3, the utility model can bear the fast temperature impact, and when impacting owing to fast temperature, the influence that can be expanded with heat and contract with cold in the position between the optical fiber produces and changes, and has only the extending type connector can keep optical property to stablize.

4, the utility model fibre-optic connector structure is simple, and reliability is high, life-span length, high anti-dust performance, easy clean surface.

Description of drawings

Fig. 1 is the structural representation of the utility model optical fiber beam expansion connector,

Fig. 2 is the structural representation of the utility model plug;

Fig. 3 exists between optical fiber collimator from axle deviation synoptic diagram;

There is the axial spacing synoptic diagram in Fig. 4 between optical fiber collimator;

There is the angular deviation synoptic diagram in Fig. 5 between collimating apparatus;

Fig. 6 is the angle connecting curve figure of TEC optical fiber collimator;

Fig. 7 expands the angle connecting curve figure after restrainting for TEC optical fiber through heating;

Fig. 8 expands the structural representation that the bundle back forms for TEC optical fiber through heating;

Fig. 9 is the conical fiber structural representation.

Embodiment

As shown in Figure 1, the four-way beam expansion connector comprises plug 1 and socket 2 (plugs and sockets has interchangeability), and plug and socket is provided with guidepost (11,12), collimating apparatus mounting hole (7,8,9,10), pilot hole 14 and collimating apparatus (3,4,5,6).Collimating apparatus and collimating apparatus mounting hole adopt wringing fit, allow a spot of glue, and guidepost and pilot hole adopt wringing fit, and collimator lens can adopt GRIN Lens, C lens (C-LENS), non-spherical lens.Optical fiber can adopt conical fiber (taper fiber), hot expanded core fiber (TEC fiber).Various optical fiber are formed optical fiber collimator with said lens respectively.

Adopt the fibre core of hot expanded core fiber or conical fiber can solve general single mode fiber mechanical precision is required too high problem,, therefore can reduce the mechanical precision requirement because the fibre core of hot expanded core fiber or conical fiber is bigger than the core diameter of single-mode fiber.Adopt the GRIN Lens can be, the spacing of 1-10mm can be arranged, easy adjusting between two collimating apparatuss of scheme that directly link to each other with respect to optical fiber and optical fiber beam collimation.

The beam expansion connector of the utility model introduction promptly is equivalent to the butt joint coupling of four collimation devices, and the mismatch during two collimating apparatus couplings is mainly derived from three aspects:

1) between optical fiber collimator from an axle deviation X1, as shown in Figure 3;

2) the angular deviation Φ between collimating apparatus is as shown in Figure 5;

3) the axial spacing z between optical fiber collimator is as shown in Figure 4;

And optical fiber collimator most important when being coupled be exactly the problem that solves angular deviation.

The loss that angular deviation Φ between collimating apparatus causes

$L_{\mathrm{\φ}}=4.343{\left[\frac{\tan \mathrm{\φ}}{n_0\sqrt{A}{\mathrm{\ω}}_0}\right]}^2$

With ω ₀=5.05um, λ=1.55um,

The refractive index of the centre n of GRIN Lens ₀In=1.591 substitution formulas, can get the optical fiber collimator angle from the axle connecting curve, as shown in Figure 6.

As can be seen from the figure, the general single mode fiber collimating apparatus for angular error require too high, when 0.072 ° of angular deviation is spent, coupling loss be 1dB. so optical fiber collimator most important when being coupled be exactly the problem that solves angular deviation.

With the hot expanded core fiber output facula of TEC radius ω ₀=15um, wavelength X=1.55um, The refractive index of the centre n of GRIN Lens ₀=1.591, the substitution following formula can get, and the angle connecting curve of TEC optical fiber collimator is as shown in Figure 7:

As can be seen from the figure; The TEC optical fiber collimator has reduced for the requirement of the angular error requirement with respect to the general single mode fiber collimating apparatus significantly; When 0.22 ° of angular deviation; Coupling loss be 1dB. therefore, the TEC optical fiber collimator has solved too sensitive issue of general single mode fiber collimating apparatus angle error.

The refringence of general single mode fiber covering and fibre core reaches through doped with Ge O2 in fibre core.The refractive index of fiber core is higher than the refractive index of molten pure silicon in the covering.When the heating general single mode fiber, the Ge that mixes in the fibre core ⁴⁺Ion will spread in fibre cladding, makes on the cross section of optic fibre refractive index radially be graded profile, thereby reaches the purpose that enlarges mode field diameter.

Fig. 8 is that TEC optical fiber expands the structural representation that the bundle back forms through heating: after adopting 1600 °～2000 ° thermal-flame that the single-mode fiber of about 4mm scope is evenly heated; The Germanium dopants that makes optical fiber be heated in the part fibre core is diffused in the optical fiber, just can reach the effect that expands bundle.Optical fiber still is step optical fiber in bringing-up section not, and refractive index is a step between fibre core and the covering, has then formed graded index profile in bringing-up section.

The utility model main application fields: guided missile, optical fiber cable for field operation connection, Aeronautics and Astronautics, navigation, armored vehicle, subway, train, high ferro, outdoor radio, heavy industry, geophysics.

Claims (5)

1. optical fiber beam expansion connector; Comprise plug and socket, all be provided with at least one collimating apparatus mounting hole on the said plug and socket, be provided with collimating apparatus in the said collimating apparatus mounting hole in identical position; Be inlaid with optical fiber in the said collimating apparatus; Be provided with pilot hole and guidepost on the said plug and socket, said pilot hole and guidepost are suitable, it is characterized in that: said collimating apparatus is GRIN Lens, C lens or non-spherical lens; Said optical fiber is conical fiber and hot expanded core fiber.

2. optical fiber beam expansion connector according to claim 1 is characterized in that: described collimating apparatus mounting hole is four, is provided with a pilot hole and a guidepost on the said plug and socket.

3. optical fiber beam expansion connector according to claim 1 and 2 is characterized in that: said optical fiber is conical fiber.

4. optical fiber beam expansion connector according to claim 3 is characterized in that: said guidepost and pilot hole adopt wringing fit.

5. optical fiber beam expansion connector according to claim 4 is characterized in that: spacing 1-10mm between said two collimating apparatuss.

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