CN2454994Y - Compacted-packed high-isolation-degree wave sharing multiplying apparatus - Google Patents

Abstract

The utility model relates to a compact-packed high-isolation-degree wave sharing multiplexing apparatus. The high-isolation-degree single-end input-output WDM device is made by using a three-optical Fiber collimator, a corresponding prism and a WDM diaphragm as a reflection and light filtering piece and making light pass through the WDM diaphragm for one time and two times or more times; the input and the output ports of the WDM device being positioned at the same side of the device is realize. The utility model has wide applied foreground in the fields of high-speed optical communication systems, access networks, full light networks, etc., and realizes the high isolation of the light and satisfies the advantage of small volume.

Description

A kind of tight type encapsulation high-isolation wavelength division multiplexer

The utility model relates to the light wavelength division multiplexing that uses in a kind of communication field, particularly a kind of tight type encapsulation high-isolation light wavelength division multiplexing.

At present, light wavelength division multiplexing (hereinafter to be referred as: WDM) the most frequently used light wave composite light path as shown in Figure 1.103 is that two optical fiber capillaries are made double optical fiber head, and 104 are about 0.25Pitch GRIN Lens, and 105 for being close to the WDM diaphragm of GRIN Lens front end face, two wavelength laser λ ₁, λ ₂Enter double-fiber collimator by optical fiber 101, behind the arrival diaphragm 105, λ ₁Wavelength light sees through WDM diaphragm, λ ₂Reflect into into optical fiber 102, λ through diaphragm ₁Collimated device 106 is accepted.

WDM diaphragm commonly used sees through wavelength X in market ₁In see through λ ₂Promptly see through end to λ ₂Isolation can be greater than 40dB, and reverberation λ ₂In contain λ ₁Amount is that reflection end is to λ ₁Isolation have only about 17dB.This WDM is widely used in the existing communication system.

Along with the optical-fibre communications development, requirements at the higher level have been proposed above-mentioned device index.As some system two-way two wavelength separated light isolations are all required greater than 35dB.By the general 17dB only of the general reflector light path of WDM diaphragm isolation, the monolithic diaphragm realizes that isolation is obviously impossible greater than 35dB, has only and could realize this index to increasing a slice WDM diaphragm in the reverberation again.Usual optical pathway as shown in Figure 2.Among Fig. 2,202 is the single fiber collimater, input light λ from optical fiber 201 ₁+ λ ₂Two wavelength light, 203 is the WDM diaphragm, separates λ ₁, λ ₂, transmitted light λ ₁Collimated device 204 is accepted λ ₂Reflected by diaphragm, wherein contain-λ of 17dB ₁Light is introduced 205 couples of λ of another WDM diaphragm again in the reverberation light path ₂Anti-reflection, λ 1 is carried out secondary reflection again, see through light λ from diaphragm 205 ₂To λ ₁Light then can reach the above isolation of 55dB easily, and transmitted light λ ₂Then collimated device 207 is accepted.And send between the light angle generally about 10 °～20 ° through diaphragm 203 reverberation and collimater 202.The θ angle can not be bigger because θ too conference introduce big Polarization Dependent Loss.This light path obvious encapsulation volume that distributes is bigger, and this is the result who makes the unwilling acceptance of passive device.

This novel purpose is: design a kind of can the isolation the light realization is high, can satisfy the little requirement of device volume again.

To achieve these goals, the following structure of this novel employing realizes above-mentioned purpose, on one side place polygon prism at three optical fiber collimator bright dipping ends, polygon prism H face is substantially parallel with three optical fiber collimator exiting surfaces, and incident light passes through S ₁Face, S ₂Be coated with the WDM film on the face, and accept the light that the WDM diaphragm as speculum reflects back, S ₃Accept the light of another sheet normal mirror reflection, 1.5 °≤θ ₁≤ 10 °, 1.5 °≤θ ₂≤ 10 °, the WDM diaphragm is between polygon prism and speculum.At polygon prism S ₂The WDM diaphragm also can be placed again in the front, or puts into the WDM diaphragm again between polygon prism and three optical fiber collimators, and this diaphragm should not influence through S ₁Face and S ₃The light of face, polygon prism also can be and contain S respectively ₁Face, S ₂Face, S ₃Three polygon prisms of face combine, and the normal mirror limit can be the WDM diaphragm.

In sum, this novel light path design advantage is fairly obvious.The first, this scheme can be by the high WDM device of isolating of required design, and the second, this scheme encapsulation volume is little, and the 3rd, the envelope that this novel realization fiber optic passive device is difficult for implementation most is close, and promptly the optical fiber input/output terminal is in device the same side.Have reason to believe that require function more and more higher with optical-fibre communications, this patent will obtain extensive use.

Elaborate below in conjunction with enforcement and accompanying drawing:

Fig. 1 is prior art light channel structure figure.

Fig. 2 is another kind of prior art light channel structure figure.

Fig. 3 is the utility model optical structure chart.

Fig. 4 is the another kind of optical structure chart of the utility model.

Fig. 5 is another optical structure chart of the utility model.

Fig. 6 is another optical structure chart of the utility model.

Fig. 7 is the utility model concrete structure figure.

The utility model adopts a kind of special light path design, realizing the high WDM of isolation device function, simultaneously, also realizes the same input/output terminal of optical fiber.Its index path as shown in Figure 3.Among Fig. 3,301,302,303 is three optical fiber of three optical fiber collimators 304, wherein 301 input λ ₁And λ ₂305 is a polygon prism, and the H face of polygon prism 305 is parallel or approximate parallel with three optical fiber collimator exiting surface F, and 306 is the WDM diaphragm, its transmission λ ₂Reflection λ ₁, λ ₂See through the WDM diaphragm to λ ₁Isolation reaches more than the 40dB, makes reverberation enter the optical fiber 302 of three optical fiber collimators like this, and eyeglass 307 is a normal mirror, and with light λ ₂Reflection enters optical fiber 303 by prism 305.The utility model has adopted special prism, promptly at S ₁, S ₂, S ₃Prism S in the prism facets ₂The face plating is to λ ₁See through, to λ ₂Reflection WDM film, and S ₁, S ₃Still be common anti-reflection film, λ like this ₁Pass through S ₂Face WDM rete is then by λ after the prism ₁Light is to λ ₂Isolation can reach 55dB easily, so promptly realize high-isolation WDM device function.

Also can there be other form in the utility model.Also can not plate the WDM film on the prism 305, at S ₂Add second WDM diaphragm before the surface, or the prism another side adds the WDM diaphragm, do not block logical S as long as guarantee this sheet WDM film ₁, S ₃Light, as Fig. 4, shown in Figure 5.If pursue higher isolation, can be with S ₂Preceding WDM diaphragm increases to two, at λ ₂Increase by one to two on the light path again to λ ₂Transmission is to λ ₁Reflection diaphragm perhaps also changes diaphragm 307 into WDM diaphragm etc.

Among Fig. 6, different is to change polygon prism among Fig. 3 into three separation prism.This scheme also can adopt more plain mode, directly plates required WDM rete at prism by the light face, simultaneously, according to desired isolation height, can be chosen in prism 405b respectively, the WDM that the plating of 405c single or double is required.

Fig. 7 is the utility model assembly structure figure.501,502,503 is optical fiber cable, 504 is three hole capillaries, and 507 is lenticule, and 505 is the metal outer pipe of three optical fiber collimators, 506,512,513 is scolding tin, and 508 is shell, and 509 prisms directly are bonded on the shell 508,510 is the WDM diaphragm, its not working portion be fixed on the hold-down bars, 511 is completely reflecting mirror, 514 is hold-down bars.

Polygon prism in the utility model can be selected the ordinary optical material for use, as K9 glass, quartz glass etc.

As establishing by prism incident light incidence angle on WDM diaphragm 306 among Fig. 3 is θ ₁, on speculum 307, the incidence angle of incident light is θ ₂, can follow following principle substantially to relevant parameter designing between three optical fiber collimators, prism, the reflector plate: 5 °≤θ ₁≤ 10 °, 1.5 °≤θ ₂≤ 10 °.

Claims (4)

1, a kind of tight type encapsulation high-isolation wavelength division multiplexer, it is characterized in that: three optical fiber collimator bright dipping ends simultaneously are provided with polygon prism, and polygon prism H face is basically parallel to three optical fiber collimator exiting surfaces, and incident light passes through S ₁Face, S ₂Be coated with the WDM film on the face, and accept light as the WDM diaphragm reflection of speculum.S ₃Accept the light of normal mirror reflection, wherein 1.5 °≤θ ₁≤ 10 °, 1.5 °≤θ ₂≤ 10 °, S ₁With S ₃Face all is coated with anti-reflection film, and the WDM diaphragm is between polygon prism and speculum, and polygon prism directly is fixed on the housing, and the part that the WDM diaphragm does not receive light is fixed on the hold-down bars, and between polygon prism and normal mirror.

2, a kind of tight type encapsulation high-isolation wavelength division multiplexer according to claim 1, its feature in: at polygon prism S ₂Front or between polygon prism and three optical fiber collimators, also one or more pieces WDM diaphragms can be set again.This diaphragm should not influence through S ₁With S ₂The light of face.

3, according to claim 1 and 2 described a kind of tight type encapsulation high-isolation wavelength division multiplexers, it is characterized in that: polygon prism also can be divided into and contain S respectively ₁Face, S ₂Face, S ₃Three prisms of face combine.

4, a kind of tight type encapsulation high-isolation wavelength division multiplexer according to claim 1 and 2, it is characterized in that: speculum also can be the WDM diaphragm.

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