CN202182973U

CN202182973U - Grating type adjustable filter

Info

Publication number: CN202182973U
Application number: CN201120231881XU
Authority: CN
Inventors: 陈彬; 陈万英; 王统领
Original assignee: O Net Communications Shenzhen Ltd
Current assignee: O Net Technologies Shenzhen Group Co Ltd
Priority date: 2011-07-01
Filing date: 2011-07-01
Publication date: 2012-04-04
Anticipated expiration: 2021-07-01

Abstract

The utility model provides a grating type adjustable filter which comprises a signal input end, a signal output end, a focusing element and gratings, and is characterized by being provided with an input and output collimator, a first grating, a first reflector, a beam expanding element, a second grating and a second reflector along an optical path, wherein the first reflector is rotatable, and the rotary reflector is used for changing the incidence angles of the first grating and the second grating so as to realize wavelength selection. The grating type adjustable filter adopts the rotary reflector with the small size, and in order to increase the time of dispersion of the grating for passing the beam expanding component, the first grating is inserted between the input and output collimator and the MEMS reflector for pre-dispersion, so that the size of the second grating does not need to be enlarged due to the rotating of the rotary reflector, therefore, the structure of the grating type adjustable filter is more miniaturized.

Description

A kind of adjustable filter of grating type

Technical field

The utility model relates to a kind of adjustable filter, particularly a kind of adjustable filter of miniaturization grating type.

Background technology

Optical filter (tunable filter) is to be used for carrying out the instrument that wavelength is selected, and it can pick out required wavelength from numerous wavelength, and except that this light wavelength will be rejected through.As a kind of wavelength selector spare, optical filter is being brought into play more and more important effect in optical fiber telecommunications system.

Fig. 1 is the index path of adjustable light wave-filter 10 of the light signal of present 100GHZ ITU wavelength; As shown in Figure 1: this adjustable light wave-filter 10 comprises signal input part 113, signal output part 111, concentrating element 13; Grating 15 and a catoptron 17; Convert parallel optical signal from the light signal of signal input part 113 inputs into through concentrating element 13, this parallel optical signal is injected grating 15 surfaces behind grating 15 diffraction, injects catoptron 17; After catoptron 17 reflections, return, and finally input to signal output part 111 by former road.Through rotating grating 15 or catoptron 17, make its this light signal be input to last entering signal output terminal 111 from signal input part 113, grating 15 is passed through twice in the centre.

If the adjustable filter of the light signal of 50GHZ ITU wavelength adopts the identical light channel structure of adjustable filter of the light signal of above-mentioned 100GHZ ITU wavelength; Can cause used lens diameter bigger; And the spot size on the reflection tilting mirror also can become big; Corresponding reflection tilting mirror diameter also must strengthen, and the spot size increase causes raster size also can correspondingly to increase.And the diameter of lens, tilting mirror and grating increases and must cause the device whole height to increase, and this not only can cause the versatility of device to descend, and the whole cost of resulting devices can to exceed the adjustable filter of light signal of 100GHZ ITU wavelength a lot.

The utility model content

Given this, be necessary to provide a kind of miniaturization, the convenient grating type adjustable filter of regulating.

A kind of adjustable filter of grating type; Comprise signal input part, signal output part, concentrating element; Grating; It is characterized in that: be provided with input, output collimator, first grating, first catoptron, beam-expanding element, second grating and second catoptron along light path, said first catoptron is rotating catoptron, and the incident angle that changes first grating and second grating through rotating catoptron realizes the wavelength selection.

Wherein, Preferred version is: the catoptron of said rotation is the MEMS catoptron; Or for having the catoptron with rotating MEMS catoptron identical function; Input collimating apparatus incident beam receives by output collimator successively through first grating, MEMS catoptron, beam-expanding element, second grating, second catoptron.

Wherein, preferred version is: said beam-expanding element is prism group or lens combination, or plays the element that expands beam function for the combination of prism group and lens combination.

Wherein, preferred version is: said input, output collimator can be substituted by a pair of optical fiber or single fiber collimating apparatus.

Because the utility model adopts undersized MEMS catoptron; Pass through beam-expanding element in order to increase the grating dispersion number of times; First grating inserts between input, output collimator and the MEMS catoptron and carries out preparatory chromatic dispersion; Can be so that the size of second grating not because of the rotation of MEMS catoptron needs large scale, makes the miniaturization more of its structure.

Description of drawings

The joint accompanying drawing further specifies the embodiment of the utility model below:

Fig. 1 is the index path of prior art adjustable filter.

Fig. 2 is the index path of adjustable filter first embodiment of a kind of grating type of the utility model.

Fig. 3 is the index path of adjustable filter second embodiment of a kind of grating type of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described further.

As shown in Figure 2; Index path for adjustable filter first embodiment of a kind of grating type of the utility model; This adjustable filter 20; Comprise double-fiber collimator 21, said double-fiber collimator 21 comprises input optical fibre 211 and output optical fibre 212, and light path is provided with first grating 22, first catoptron 23, triangular prism 24, second grating 25 and second catoptron 26 successively; Said first grating 22 receives the light beam of input optical fibre 211 inputs; It closely is divided into light beams of different wavelengths, and the back is separated beam reflection to the second grating 25 of small distance with above-mentioned according to different wave length by first catoptron 23, said second grating 25 with the above-mentioned light beam that separates small distance according to different wave length once more wavelength basis separate; After isolate light beams of different wavelengths by second catoptron, 26 reflected backs successively through second grating 25, triangular prism 24, first catoptron 23 and first grating 22, after receive by the output optical fibre 212 of double-fiber collimator 21.Said first catoptron 23 is used for adjusting to as required the light signal that suitable angle is selected required wavelength; This little rot 231 is used for controlling the rotational angle size; This control module 232 is used for the input voltage high low signal to driver element 233, and this driver element 233 is used for the rotational angle size according to the received little rot 231 of voltage swing signal controlling.

The light path principle of present embodiment is: during use; Convert parallel optical signal from the light signal of input optical fibre 211 inputs into through the lens 213 in the collimating apparatus; This parallel optical signal is injected first grating, 22 surfaces through grating 22 diffraction; Through first catoptron 23, triangular prism 24, second grating 25 process once more after the reflection of diffraction and second catoptron 26 once more, light signal returns according to former road light signal behind the diffraction, and finally inputs to signal output optical fibre 212 successively.This light signal is input to last entering signal output terminal 212 from signal input part 211.

In the foregoing description, input optical fibre 211 can adopt two optical fiber pigtail forms with output optical fibre 212, and the spacing between the said pair of optical fiber is adjustable.In the present embodiment, the centre distance of two optical fiber is 125 μ m.

Triangular prism described in the present embodiment 24 increases the chromatic dispersion angle of receiving beam.

Like Fig. 3 is the index path of adjustable filter second embodiment of a kind of grating type of the utility model; This adjustable filter 30; Comprise double-fiber collimator 31; Comprise input optical fibre 311 and output optical fibre 312; Light path is provided with first grating 32, first catoptron 33, lens combination 34, second grating 35 and second catoptron 36 successively, and said first grating 32 receives the light beam of input optical fibres 311 inputs, and it closely is divided into light beams of different wavelengths; The back by first catoptron 33 with above-mentioned beam reflection to the second grating 35 that separates small distance according to different wave length; Said second grating 35 with the above-mentioned light beam that separates small distance according to different wave length once more wavelength basis separate, isolate light beams of different wavelengths by second catoptron, 36 reflected backs successively through second grating 35, lens combination 34, first catoptron 33 and first grating 32, after receive by the output optical fibre 312 of double-fiber collimator 31.Said first catoptron 33 is used for adjusting to as required the light signal that suitable angle is selected required wavelength; This little rot 331 is used for controlling the rotational angle size; This control module 332 is used for the input voltage high low signal to driver element 333, and this driver element 333 is used for the rotational angle size according to the received little rot 331 of voltage swing signal controlling.

The light path principle of present embodiment is: during use; Convert parallel optical signal from the light signal of input optical fibre 311 inputs into through the lens 313 in the collimating apparatus; This parallel optical signal is injected first grating, 32 surfaces through grating 32 diffraction; Through first catoptron 33, lens combination 34, second grating 25 process once more after the reflection of diffraction and second catoptron 34 once more, light signal returns according to former road light signal behind the diffraction, and finally inputs to signal output optical fibre 312 successively.This light signal is input to last entering signal output terminal 312 from signal input part 311.

In the foregoing description, input optical fibre 311 can adopt two optical fiber pigtail forms with output optical fibre 312, and the spacing between the said pair of optical fiber is adjustable.In the present embodiment, the centre distance of two optical fiber is 125 μ m.

Because the utility model adopts undersized MEMS catoptron; In order to increase the grating dispersion number of times through triangular prism 24 or lens combination 34; First grating inserts between input, output collimator and the MEMS catoptron and carries out preparatory chromatic dispersion; Can be so that the size of second grating not because of the rotation of MEMS catoptron needs large scale, makes the miniaturization more of its structure.

Although specifically 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 utility model that does not break away from appended claims and limited; Can make various variations to the utility model in form with on the details, be the protection domain of the utility model.

Claims

1. the adjustable filter of a grating type; Comprise signal input part, signal output part, concentrating element; Grating; It is characterized in that: be provided with input, output collimator, first grating, first catoptron, beam-expanding element, second grating and second catoptron along light path, said first catoptron is rotating catoptron, and the incident angle that changes first grating and second grating through rotating catoptron realizes the wavelength selection.

2. the adjustable filter of grating type according to claim 1; It is characterized in that: the catoptron of said rotation is the MEMS catoptron; Or for having the catoptron with rotating MEMS catoptron identical function; Input collimating apparatus incident beam receives by output collimator successively through first grating, MEMS catoptron, beam-expanding element, second grating, second catoptron.

3. the adjustable filter of grating type according to claim 1, it is characterized in that: said beam-expanding element is prism group or lens combination, or plays the element of expansion beam function for the combination of prism group and lens combination.

4. the adjustable filter of grating type according to claim 1, it is characterized in that: said input, output collimator can be substituted by a double-fiber collimator.

5. the adjustable filter of grating type according to claim 1, it is characterized in that: said input, output collimator can be substituted by a single fiber collimating apparatus.