CN201383039Y - Optical structure - Google Patents

Abstract

The utility model relates to an optical structure applied to the optical communication field, which belongs to the laser and optical field. The optical structure comprises a dispersion beam expanding system and a converging lens, wherein the dispersion beam expanding system is arranged on an incidence light path, and the converging lens is arranged on an emergent light path of the dispersion beam expanding system; the dispersion beam expanding system comprises two dispersion prisms or a beam-expanding telescope and a dispersion prism; a plurality of short-focus cylindrical lenses or spherical mirrors are arranged behind the converging lens, or a light column is also arranged behind the converging lens, and a photoelectric detector matrix is arranged behind the light column; and the converging lens is a spherical converging lens or cylindrical converging lens. The utility model with the advantages of simpler structure, convenient manufacture, low cost of the raw material and lower production cost can be widely applied to a laser beam splitting and combining device with a certain wavelength interval.

Description

A kind of optical texture

Technical field

The utility model relates to laser and optical field, relates in particular to the optical texture that is applied to the optical communication field.

Background technology

Along with the development of optical-fibre communications, multiplexed optical wave with The Application of Technology more and more widely especially in fields such as optical-fiber network, optical information transmission, therefore need be divided into a branch of light the different laser of several Shu Bochang usually, perhaps needs the combiner that several Shu Bochang are different.In optical-fibre communications, the laser that one group of wavelength is different separately or close Shu Tongchang and adopt the medium diaphragm to realize, though people also adopt grating as dispersion element, its price height is made and is difficult for.

The utility model content

The utility model proposes the optical texture that a kind of structure is simpler, cost is lower and realizes that its technical scheme is as follows at the problems referred to above:

Optical texture of the present utility model comprises chromatic dispersion beam-expanding system and convergent lens, and described chromatic dispersion beam-expanding system is arranged on the input path, and described convergent lens is arranged on the emitting light path of described chromatic dispersion beam-expanding system.

Further, described chromatic dispersion beam-expanding system is made of two dispersing prisms or is made of a beam expanding telescope and a chromatic dispersion prism.

Further, described input path is the outgoing beam through an optical fiber collimator.

Further, also be provided with a plurality of short focal length cylindrical lenses or spherical mirror behind the described convergent lens.

Perhaps, also be provided with a light beam behind the described convergent lens, be provided with matrix of photodetectors behind the described light beam.

Perhaps, being provided with one between the cylindrical lens of described convergent lens and described a plurality of short focal length cylindrical lens or spherical mirror formation or the spherical mirror array absorbs or the reflection diaphragm.

Further, described convergent lens is with sphere convergent lens or cylinder convergent lens.

Optical texture of the present utility model can be used to make the Raman spectrum optical system for testing, wavelength division multiplexer perhaps is used to make the multi-wavelength selective light and opens, in the passive devices such as multi-wavelength power monitor, perhaps be applied to multiple-wavelength laser and make, each wavelength space of multiwavelength laser separates.

The utility model adopts as above technical scheme, can be widely used in having in certain wavelength interval laser beam splitter and the bundling device spare, as wavelength division multiplexer in the optical-fibre communications, multi-wavelength selective light switch, in the optical passive components such as wavelength and corresponding power watch-dog, also can make and separate, can also be used to make simple special spectrometer with the multiple-wavelength laser output wavelength of multiple-wavelength laser.Its cost of raw material is low, and is easy to make, is expected to obtain the application of certain limit.

Description of drawings

Fig. 1 is the structural representation of first embodiment of the present utility model;

Fig. 2 is the structural representation of second embodiment of the present utility model;

Fig. 3 is the structural representation of the 3rd embodiment of the present utility model;

Fig. 4 is the structural representation of the 4th embodiment of the present utility model.

Embodiment

Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.

Consult Fig. 1, wherein 1011,1012 is one group of dispersing prism, if M is the expansion bundle multiple of prism, be D/d, wherein d1 is a wide-angle incident laser beam diameter, D is for by expanding direction diameter of light beams behind the prism, and emergent light is perpendicular to another face of prism during to single prism wide-angle incident, and its dispersion equation is:

$\frac{\mathrm{d\θ}1}{\mathrm{d\χ}}=\mathrm{tgA}\·\frac{\mathrm{dn}}{\mathrm{d\λ}}$

To single prism incident angle is θ, and A is a prism vertex angle, and n is the prismatic refraction rate, goes into to be wavelength, and many groups prism single is passed through, and its dispersity then is each prismatic colours divergence sum:

$\frac{\mathrm{d\θ}}{\mathrm{d\λ}}=\underset{i}{\mathrm{\Σ}}\mathrm{tgA}\·\frac{\mathrm{dn}}{\mathrm{d\λ}}$

The 102nd, convergent lens is the cylindrical lens of long-focus, and focal length is f1,1031,1032......103n is that n group focal length is the short focal length cylindrical lens of f2, constitutes one group of bundle lens that contract, and establishes the compression multiple that M ' is a cylindrical lens 102:

M′＝f ₁/f ₂

Usually get M ≈ M ', even light beam is reduced to the elementary beam diameter.Principle of the present utility model is, is provided with one group of λ 1 that certain intervals is arranged, and λ 2, λ 3...... λ n wavelength laser is expanded bundle M doubly by 1011,1012 chromatic dispersions of dispersing prism group, again with a pair of bundle set of cylindrical lenses that contracts with wide-angle incident, its multiplying power is M ', and then whole optical path role divergence is:

$\frac{\mathrm{d\θ}}{\mathrm{d\λ}}=M^{\′}\underset{i}{\mathrm{\Σ}}\mathrm{tgA}\·\frac{\mathrm{dni}}{\mathrm{d\λ}}$

If M=M ', then each wavelength light beam diameter and incident light are basic identical after the chromatic dispersion.

The utility model also can be used to make wavelength or power monitor, or the simple optical spectrometer, as is used for raman spectroscopy measurement.

Consult shown in Figure 2, second embodiment of the present utility model can constitute the dispersing prism group 1011,1012 that the chromatic dispersion beam-expanding system replaces first embodiment with a beam expanding telescope 202 and a chromatic dispersion prism 203, and wherein beam expanding telescope 202 comprises first extender lens 2021 and second extender lens, 2022 formations.Input path can be the outgoing beam through an optical fiber collimator 201.

Consult the 3rd embodiment shown in Figure 3, wherein 201 is optical fiber collimator, first chromatic dispersion prism beam expander 1011 and second chromatic dispersion prism beam expander 1012 constitute the chromatic dispersion beam-expanding system, the 102nd, convergent lens, be cylindrical mirror, 204 is photodetector array, 205 is light beam, after a series of wavelength dispersions, accepted by photodetector array 204, photodetector array 204 can be ccd array or PD array, if be used for spectral measurement such as Raman spectrum,, can directly remove pumping or adjacent Rayleigh scattering light in the miniature absorbing sheet of adding or reflection a slice of the position of pump light chromatic dispersion because each wavelength isolation of dispersing prism is very high.

Consult the 4th embodiment shown in Figure 4, wherein 202 is beam expanding telescope, can be set of cylindrical lenses or spherical lens group, 203 is common dispersing prism, 102 is convergent lens, the same with second embodiment with first embodiment, a plurality of cylindrical lenses or spherical lens formation 1031, one group of cylinder of 1032......103n or sphere contract bundle telescope 103,206 for absorbing or the reflection diaphragm.

Dispersing prism of the present utility model can adopt following material:

Table 1 is made the various material data of prism

As seen from the above table, utilize the prism TiO that makes under the identical multiplying power ₂The angular dispersion maximum, secondly be YVO ₄

The utility model is owing to adopt the prism dispersion element, and it has higher isolation than common DWDM diaphragm and each wavelength of grating pair.

The utility model can be widely used in having in certain wavelength interval laser beam splitter and the bundling device spare, as wavelength division multiplexer in the optical-fibre communications, multi-wavelength selective light switch, in the optical passive components such as wavelength and corresponding power watch-dog, also can make and separate, can also be used to make simple special spectrometer with the multiple-wavelength laser output wavelength of multiple-wavelength laser.Its cost of raw material is low, and is easy to make, is expected to obtain the application of certain limit.

Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection domain of the present utility model.

Claims (7)

1. optical texture, it is characterized in that: comprise chromatic dispersion beam-expanding system and convergent lens (102), described chromatic dispersion beam-expanding system is arranged on the input path, and described convergent lens (102) is arranged on the emitting light path of described chromatic dispersion beam-expanding system.

2. optical texture as claimed in claim 1 is characterized in that: described chromatic dispersion beam-expanding system is made of two dispersing prisms (1011,1012) or is made of a beam expanding telescope (202) and a chromatic dispersion prism (203).

3. optical texture as claimed in claim 1 is characterized in that: described input path is the outgoing beam through an optical fiber collimator (201).

4. optical texture as claimed in claim 1 is characterized in that: also be provided with a plurality of short focal length cylindrical lenses or spherical mirror (103n) behind the described convergent lens (102).

5. optical texture as claimed in claim 4 is characterized in that: be provided with one between cylindrical lens that described convergent lens (102) and described a plurality of short focal length cylindrical lens or spherical mirror (103n) constitute or the spherical mirror array (103) and absorb or reflection diaphragm (206).

6. optical texture as claimed in claim 1 is characterized in that: also be provided with a light beam (205) behind the described convergent lens (102), be provided with matrix of photodetectors (204) behind the described light beam.

7. as claim 1 or 4 or 5 or 6 described optical textures, it is characterized in that: described convergent lens (102) is sphere convergent lens or cylinder convergent lens.

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