CN100534011C - Ultranarrow double-channel filter based on symmetric sampling grating structure - Google Patents

Ultranarrow double-channel filter based on symmetric sampling grating structure Download PDF

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CN100534011C
CN100534011C CNB200710017535XA CN200710017535A CN100534011C CN 100534011 C CN100534011 C CN 100534011C CN B200710017535X A CNB200710017535X A CN B200710017535XA CN 200710017535 A CN200710017535 A CN 200710017535A CN 100534011 C CN100534011 C CN 100534011C
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grating
sfbg
bragg grating
symmetrical
raster
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CN101022314A (en
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刘雪明
宫永康
王雷然
王涛
赵卫
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XiAn Institute of Optics and Precision Mechanics of CAS
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XiAn Institute of Optics and Precision Mechanics of CAS
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Abstract

A super-narrow double channel filter based on symmetric-sampling grating structure consists of two SFBG and one optical circulator with three ports. It is featured as applying O to pi cycle to carry out sampling by one Bragg grating and applying symmetric-space sampling by another Bragg grating, generating two suppression frequency bands on spectral line by the former and generating two through frequency bands by the latter.

Description

Super narrow dual channel filter based on symmetrical sampled-grating structure
Technical field
The present invention relates to a kind of optical filter, relate in particular to a kind of super narrow double-channel optical filter.
Background technology
Bragg grating (FBG) has been applied in numerous optical fiber optical devices, as optical filter, optical pickocff etc.FBG has the multi channel ability of generation simultaneously.But traditional sampling bragg grating (SFBG) is with simple binary sampled carrying out, and the multichannel length of its realization is different with bandwidth.Although complicated sinC shan technology can overcome these problems and can realize identical multichannel Bragg grating filter, each channel width is very big, is generally 100pm-300pm.Introduce a space π phase shift in the center of uniform fiber grating simultaneously, the rejection band of this grating can obtain super narrow transmission window, but can only obtain a single channel response.
Summary of the invention
The object of the invention provides a kind of super narrow dual channel filter based on symmetrical sampled-grating structure, and it has solved the technical problem that the multichannel intensity that traditional SFBG realizes in the background technology is different with bandwidth, each channel width of multichannel Bragg grating filter is very big and can only obtain a response.
Technical solution of the present invention is: a kind of super narrow dual channel filter based on symmetrical sampled-grating structure, its special character are that it comprises 3 ports light rings A and is connected 0 on the 3 ports light rings A to π sampling Bragg grating SFBG 1, symmetrical structure Bragg grating SFBG 2, described symmetrical structure Bragg grating SFBG 2Concrete structure be: sample length is L 1Uniform fiber grating and no-raster partly be alternately distributed, no-raster partly has two width, is respectively L 2, L 3, represent each section grating and no-raster part with length, made grating part and no-raster partly by ... L 1L 2L 1L 3L 3L 1L 3L 3L 1L 2L 1Mode is arranged, and this arrangement mode is about the center symmetry; Described 0 to π sampling Bragg grating SFBG 1Concrete structure be: sample length is L 1Even discrete optical fibre grating and no-raster partly be alternately distributed, no-raster partly has two width, is respectively L 2, L 3, represent each section grating and no-raster part with length, made grating part and no-raster partly by ... L 1L 2L 1L 3L 1L 2Mode is arranged; L wherein 2=m Λ, L 3=(n+0.5) Λ, Λ is a Bragg period, m, n represent integer respectively.
Above-mentioned 3 ports light rings A, 0 to π sampling Bragg grating SFBG 1, symmetrical structure Bragg grating SFBG 2Between annexation be: 0 to π sampling Bragg grating SFBG 1Be connected symmetrical structure Bragg grating SFBG with the Centronics port A2 of 3 ports light rings A 2Be connected with the output port Λ 3 of 3 ports light rings A.
Above-mentioned 3 ports light rings A, 0 to π sampling Bragg grating SFBG 1, symmetrical structure Bragg grating SFBG 2Between annexation can also be: 0 to π sampling Bragg grating SFBG 1Be connected symmetrical structure Bragg grating SFBG with the Centronics port A2 of 3 ports light rings A 2Be connected with the input port A1 of 3 ports light rings A.
The used optical fiber of above-mentioned grating is erbium-ytterbium co-doped fiber.
Above-mentioned Bragg period Λ=534.2nm, m=600, n=584.
The advantage that the present invention has is:
1, the three dB bandwidth of each channel is approximately 1pm (10 -12M), lack two orders of magnitude (10 than traditional F BG filter -10M).
2, two channel transfer characteristics much at one.Two channels should be the same in theory, and main difference theoretical and experiment comes from that the spectroanalysis instrument resolution pole is limited to 0.01nm in experiment.
3, when changing two channels of filter, its space channel is constant.Experimental result as shown in Figure 5, filter wavelength is spacing with 0.3nm, the channel spacing of filter remains 440pm when wavelength shift.
Description of drawings
Fig. 1 (a) is the bragg grating structural representation of 0 to π sampling in the super narrow dual channel filter of the present invention, Fig. 1 (b) is symmetrical structure bragg grating structural representation in the super narrow dual channel filter of the present invention, wherein transverse axis (Z axle) is the grating length direction, and the longitudinal axis is an index modulation;
Fig. 2 (a) is the transmission spectrum schematic diagram of 0 to π sampling bragg grating, and Fig. 2 (b) is the transmission spectrum schematic diagram of symmetrical structure bragg grating, and transverse axis is a wavelength, and the longitudinal axis is a power;
Fig. 3 (a) and Fig. 3 (b) are two kinds of versions of the super narrow dual channel filter of the present invention, wherein SFBG 1Be 0 to π sampling bragg grating, SFBG 2Be the symmetrical structure bragg grating; A is 3 ports light rings, and the input light wave is the input port A1 input of optical circulator from then on, arrives Centronics port A2, through SFBG 1Its reflected wave of reflection back is exported from output port A3;
Fig. 4 is a transmission spectrum, and dotted line is a theoretical value, and solid line is an experimental result; Transverse axis is a wavelength, and the longitudinal axis is a power;
Fig. 5 is 5 groups of transmission spectrums that obtain with about 0.3nm tuning SFBG in interval.
Embodiment
The structure of the super narrow dual channel filter of the present invention sees Fig. 3 for details, mainly by one 3 ports light rings, 0 to a π sampling Bragg grating SFBG 1With a symmetrical structure Bragg grating SFBG 2Form.Its annexation has two kinds: first kind of annexation seen Fig. 3 (a), 0 to π sampling Bragg grating SFBG 1Be connected symmetrical structure Bragg grating SFBG with the Centronics port A2 of 3 ports light rings A 2Be connected with the output port A3 of 3 ports light rings A.The input light wave arrives Centronics port A2, through SFBG from the input port A1 input of 3 ports light rings 2Its reflected wave of reflection back is through symmetrical structure Bragg grating SFBG 2Export from output port A3 the back.Second kind of annexation seen Fig. 3 (b), 0 to π sampling Bragg grating SFBG 1Be connected symmetrical structure Bragg grating SFBG with the Centronics port A2 of 3 ports light rings A 2Be connected with the input port A1 of 3 ports light rings A, export from output port A3.The input light wave is from the input port A1 input of 3 ports light rings, through symmetrical structure Bragg grating SFBG 2The back arrives Centronics port A2, through SFBG 2Its reflected wave of reflection back is exported from output port A3.
The concrete structure of SFBG is seen Fig. 1, and (length is L to uniform fiber grating 1) by periodicity no-raster partial L 2And L 3Separate, wherein L 1Be sample length, L 2And L 3Be gap length, constitute SFBG.In Fig. 1 (a), whole grating is arrived the π periodic sampling by 0, constitutes one 0 to π SFBG.In Fig. 1 (b), when it reached in the middle of the grating, 0 to π periodic sampling became the periodic sampling order of π to 0 in proper order, constitutes a symmetrical structure SFBG.In making the SFBG process, Bragg period Λ is 534.2nm.By adjusting every L 2And L 3Length, make them satisfy L respectively 2=m Λ, L 3=(n+0.5) Λ, the m here, n are integers.L 2, L 3Corresponding 2m π, (2n+1) π phase place are equivalent to " 0 " and " π " phase place respectively.For simplicity, name L respectively 2And L 3Be 0 sampling and π sampling.
Fiber grating is to scribe with the ultraviolet light that the frequency multiplication argon ion laser produces, and its power is about 130mW, wavelength 244nm, and scribing precision is 10 nanometers, Λ=534.2nm, L 1=0.64104nm, L 2=0.32052mm (is L 2=600 Λ), L 3=0.31224mm (is L 3=584.5 Λ).In manufacturing process, optical fiber moves on the platform that template is fixed, and promptly optical fiber laterally moves, and template is fixed, and the grating total length is about 57mm.L 2And L 3Part does not have a ultraviolet irradiation, so our one step of grating makes and need not reprocessing.
Among the present invention the transmission spectral line of SFBG as shown in Figure 2, Fig. 2 (a) and Fig. 2 (b) be the experimental result of corresponding diagram 1 (a) and Fig. 1 (b) respectively.The result is measured by ADVANTEST Q8384 spectroanalysis instrument (OSA), and the resolution pole of OSA is limited to 0.01nm, and super narrow double-channel peak value is-45dBm that its theoretical value is-33dBm, sees Fig. 4.
From Fig. 2 (a) and Fig. 2 (b) as can be seen:
(1) the double-channel fissipation factor of Fig. 2 (a) is 32dB, and the double-channel fissipation factor of Fig. 2 (b) is for being 30dB.
The interval delta λ of (2) two channels is 440pm.
(3) the channel spectrum characteristic of the channel spectrum characteristic of 1548.8nm and 1549.2nm is approaching.
(4) the narrow transmission spectral line of three dB bandwidth (Fig. 2 (b)) is about 1pm.Compare with the spectral line of 0 to π sampling among Fig. 2 (a), the symmetrical SFBG spectral line among Fig. 2 (b) is opened two super narrow passbands in two attenuation bands.
From the physics angle, the SFBG of proposition can be considered to the SFBG of two cascades.So twice of the approaching tradition sampling of Δ λ FBG:
Figure C200710017535D00061
N wherein EffBe effective refractive index.
According to experiment related parameter is arranged, obtain Δ λ=440pm by last formula.Meeting very much of theoretical value and experimental result.Therefore, two narrow channels among Fig. 2 (b) are similar to the cascade of two traditional π phase shift FBG.
Symmetrical structure SFBG among connection layout 1 (a) 0 to π sampling SFBG and Fig. 1 (b) just can obtain a kind of novel super narrow dual channel filter.In Fig. 3, SFBG1 and SFBG2 adopt the structure of Fig. 1 (a) and Fig. 1 (b) respectively.The spectral line of this new mode filter as shown in Figure 4.Dotted line is a theoretical value, and solid line is an experimental result.This as can be seen from Figure 4 new mode filter has following advantage:
(1) three dB bandwidth of each channel is approximately 1pm, lacks two orders of magnitude (10 than traditional F BG filter -10M).
(2) two channel transfer characteristics much at one.
(3) two channels should be the same in theory.Main difference theoretical and experiment comes from experiment, and OSA resolution can only reach 0.01nm.
In addition, it is constant that filter unique distinction of the present invention is to change its channel spacing of wavelength.Experimental result as shown in Figure 5, filter wavelength is spacing with 0.3nm, filter channel is at interval constant when wavelength shift, still is 440pm.
Operation principle of the present invention:
The present invention is based on 0 to π sampling and symmetrical structure and designed attenuation band and super narrow double-channel SFBG, and form a kind of novel super narrow dual channel filter by symmetrical FBG and 0 to π sampling FBG.One of them SFBG is with 0 to the π periodic sampling, and another is the symmetric space sampling.The former produces two rejection bands on its spectral line, the latter produces two passbands.This filter can obtain symmetrical spectrum, and its channel also doubles, and its grating can be considered the cascade of two SFBG.When changing two channels of filter, its space channel is constant.The about 1pm of this filter three dB bandwidth, its value is lacked two orders of magnitude than traditional SFBG filter.This filter remarkable advantage is that its Δ of change filter λ is constant, and passes through to change sample length L in experiment 1With spacing L 2, L 3, can make Δ λ tuning in 0.01nm arrives the 2nm scope.
This super narrow dual channel filter will have important application in fields such as double-wavelength single-longitudinal-mode (SLM) fiber laser, the generation of microwave signal, the monolateral modulation of optics, the processing of microwave picture signal.

Claims (5)

1, a kind of super narrow dual channel filter based on symmetrical sampled-grating structure is characterized in that, it comprises 3 ports light rings (A) and is connected 0 on 3 ports light rings (A) to π sampling Bragg grating (SFBG 1), symmetrical structure Bragg grating (SFBG 2), described symmetrical structure Bragg grating (SFBG 2) concrete structure be: sample length is L 1Uniform fiber grating and no-raster partly be alternately distributed, no-raster partly has two width, is respectively L 2, L 3, represent each section grating and no-raster part with length, made grating part and no-raster partly by ... L 1L 2L 1L 3L 3L 1L 3L 3L 1L 2L 1Mode is arranged, and this arrangement mode is about the center symmetry; Described 0 to π sampling Bragg grating (SFBG 1) concrete structure be: sample length is L 1Even discrete optical fibre grating and no-raster partly be alternately distributed, no-raster partly has two width, is respectively L 2, L 3, represent each section grating and no-raster part with length, made grating part and no-raster partly by ... L 1L 2L 1L 3L 1L 2Mode is arranged; L wherein 2=m Λ, L 3=(n+0.5) Λ, Λ is a Bragg period, m, n represent integer respectively.
2, the super narrow dual channel filter based on symmetrical sampled-grating structure according to claim 1 is characterized in that, described 3 ports light rings (A), 0 to π sampling Bragg grating (SFBG 1), symmetrical structure Bragg grating (SFBG 2) between annexation be: 0 to π sampling Bragg grating (SFBG 1) be connected symmetrical structure Bragg grating (SFBG with the Centronics port (A2) of 3 ports light rings (A) 2) be connected with the output port (A3) of 3 ports light rings (A).
3, the super narrow dual channel filter based on symmetrical sampled-grating structure according to claim 1 is characterized in that, described 3 ports light rings (A), 0 to π sampling Bragg grating (SFBG 1), symmetrical structure Bragg grating (SFBG 2) between annexation can also be: 0 to π sampling Bragg grating (SFBG 1) be connected symmetrical structure Bragg grating (SFBG with the Centronics port (A2) of 3 ports light rings (A) 2) be connected with the input port (A1) of 3 ports light rings (A).
4, the super narrow dual channel filter based on symmetrical sampled-grating structure according to claim 1 is characterized in that, the used optical fiber of described grating is erbium-ytterbium co-doped fiber.
5, according to the described super narrow dual channel filter of arbitrary claim of claim 1 to 4, it is characterized in that described Bragg period Λ=534.2nm, m=600, n=584 based on symmetrical sampled-grating structure.
CNB200710017535XA 2007-03-20 2007-03-20 Ultranarrow double-channel filter based on symmetric sampling grating structure Expired - Fee Related CN100534011C (en)

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* Cited by examiner, † Cited by third party
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CN1405587A (en) * 2002-11-12 2003-03-26 于丽 Double refraction optical-fiber grating
CN1488964A (en) * 2002-10-07 2004-04-14 三星电子株式会社 Optical cross-linking system
US20060045416A1 (en) * 2004-08-30 2006-03-02 Hojoon Lee Wavelength division multiplexing device capable of compensating for dispersion and dispersion slope using purely phase-sampled fiber bragg grating
US20060083464A1 (en) * 2004-10-18 2006-04-20 Myoung Sook Oh Millimeter wave oscillator using fiber bragg grating
US20060127004A1 (en) * 2004-12-13 2006-06-15 General Dynamics Advanced Information Systems, Inc. System and method for performing dispersion compensation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1488964A (en) * 2002-10-07 2004-04-14 三星电子株式会社 Optical cross-linking system
CN1405587A (en) * 2002-11-12 2003-03-26 于丽 Double refraction optical-fiber grating
US20060045416A1 (en) * 2004-08-30 2006-03-02 Hojoon Lee Wavelength division multiplexing device capable of compensating for dispersion and dispersion slope using purely phase-sampled fiber bragg grating
US20060083464A1 (en) * 2004-10-18 2006-04-20 Myoung Sook Oh Millimeter wave oscillator using fiber bragg grating
US20060127004A1 (en) * 2004-12-13 2006-06-15 General Dynamics Advanced Information Systems, Inc. System and method for performing dispersion compensation

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