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CN109521518B - Multi-channel fiber grating filter based on direct current modulation and manufacturing method thereof - Google Patents

Multi-channel fiber grating filter based on direct current modulation and manufacturing method thereof Download PDF

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CN109521518B
CN109521518B CN201811530746.8A CN201811530746A CN109521518B CN 109521518 B CN109521518 B CN 109521518B CN 201811530746 A CN201811530746 A CN 201811530746A CN 109521518 B CN109521518 B CN 109521518B
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fiber grating
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CN109521518A (en
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赵华
李洪谱
朱程亮
张苗苗
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Nanjing Normal University
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
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Abstract

本发明提出了一种直流调制的多通道光学滤波器及制作方法，在一根光纤上周期相差10倍以上的采样、种子两种光栅，种子光栅采用普通光纤光栅，采样光栅的折射率变化采用特定优化设计的具有周期性折射率变化函数，采样光栅的折射率变化对种子光栅的折射率变化直流部分起慢调制作用，以形成均匀信道间隔和信道增益的多通道光学滤波器。滤波器频率间隔由采样光栅周期设定；中心波长由种子光栅周期设定；通道数由作用于采样光栅折射率变化的优化慢变函数确定；多通道滤波器的频谱特性保持一致，由种子光栅的频谱特性决定。制作步骤为在一根光纤上制作具有折射率变化函数特性的采样光纤光栅和普通光纤特性的种子光纤光栅，种子、采样光栅制作顺序可调。

Figure 201811530746

The invention provides a DC-modulated multi-channel optical filter and a manufacturing method. There are two kinds of gratings, sampling and seed, whose period differs by more than 10 times on an optical fiber. The seed grating adopts an ordinary fiber grating, and the refractive index change of the sampling grating adopts The specific optimized design has a periodic refractive index change function, and the refractive index change of the sampling grating acts as a slow modulation on the direct current part of the refractive index change of the seed grating to form a multi-channel optical filter with uniform channel spacing and channel gain. The filter frequency interval is set by the sampling grating period; the center wavelength is set by the seed grating period; the number of channels is determined by the optimized slow-varying function acting on the refractive index change of the sampling grating; determined by the spectral characteristics. The fabrication steps are to fabricate sampling fiber gratings with refractive index change function properties and seed fiber gratings with common fiber properties on an optical fiber, and the order in which the seeds and sampling gratings are fabricated can be adjusted.

Figure 201811530746

Description

Multi-channel fiber grating filter based on direct current modulation and manufacturing method thereof
Technical Field
The invention relates to the technical field of optical communication and optical sensing, in particular to a multi-channel fiber grating filter based on direct current modulation and a manufacturing method thereof in the field.
Background
A multi-channel fiber grating filter having uniform characteristics of channel spacing and channel gain is an important device in the fields of optical communication and optical sensing. Although the traditional scheme for realizing the multi-channel filter through the periodic modulation of the alternating current part with the change of the grating refractive index is simple and easy, the consistency of gains of different channels cannot be ensured. The manufacturing conditions of the amplitude and the phase (or the period) of the refractive index change required by the uniform multi-channel fiber grating filter can be calculated through a layered peeling algorithm or a multi-parameter optimization algorithm, but the manufacturing requirements have extremely high requirements on the control precision of the amplitude and the phase in the fiber grating manufacturing process, and the manufacturing conditions are difficult to realize in the actual fiber grating production process or have high realization cost, for example, expensive high-precision phase templates are required.
The patents related to the multi-channel fiber grating at home and abroad are as follows:
tunable multi-channel filter based on silicon-based graphene Bragg grating structure (Chinese patent CN 107390306A);
a high-speed high-precision multi-channel Bragg grating demodulator (Chinese patent CN 106404015A);
a synchronous multi-channel fiber grating sensing and adjusting system (Chinese patent CN 102589586A);
an optical fiber multi-channel perimeter sensing system (Chinese patent CN102519501A) adopting a wavelength division multiplexer;
a parallel distributed computing multi-channel fiber bragg grating vibration signal intelligent sensing system (Chinese patent CN 106404153A).
There are also methods for realizing multi-channel fiber grating filter by periodic modulation function of alternating part of refractive index change in domestic and foreign papers, some methods are simple but cannot realize multi-channel gain consistency; some of the devices can realize the multi-channel gain consistency, but need complex processes, particularly need expensive high-precision phase templates; there is no design and manufacturing method based on the common fiber grating which can realize the characteristics of the uniform multi-channel optical filter and simultaneously meet the requirements of good uniform characteristics and low processing technology, and there is no design and manufacturing method of the uniform fiber grating filter adopting periodic direct current modulation.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical problems, the invention provides a multi-channel fiber grating filter based on direct current modulation and a manufacturing method thereof, so as to overcome the defects that the traditional periodic multi-channel optical filter is difficult to realize or high in realization cost.
The technical scheme is as follows: the invention adopts a structure of sampling and seed grating with coexistence periods different by more than 10 times on one optical fiber; the seed grating adopts a conventional fiber grating (a homodromous coupling grating or a reverse coupling grating), the refractive index change of the sampling grating adopts a periodic refractive index change function with specific optimization design, and the refractive index change of the sampling grating finally plays a role in slowly modulating a direct-current part of the refractive index change of the seed grating, so that a uniform channel interval and channel gain multi-channel optical filter is finally formed. The adopted sampling grating is a uniform period grating, so that accurate phase control is not needed, and an expensive phase template is not needed in the manufacturing process. The frequency interval of the realized filter is set arbitrarily by the period of the sampling grating; the central wavelength is determined by the period of the seed grating; the number of channels is more than 2 and is determined by different kinds of special optimized refractive index slow-changing functions; the spectral characteristics of the multi-channel filter remain consistent and are determined by the spectral characteristics of the seed grating. The obtained channel spacing or frequency spacing characteristics are respectively:
seed gratings corresponding to reverse mode coupling (typically bragg fiber gratings): the obtained channel wavelength interval is
Figure BDA0001905591150000021
The obtained frequency interval is
Figure BDA0001905591150000022
Wherein P is the period of the sampling grating, Λ is the period of the seed grating, λ is the set central wavelength, c is the speed of light in vacuum, neffFor the average effective refractive index of the two modes of the back coupling, s is a waveguide dispersion correction factor related to the waveguide dispersion of the different modes of the back coupling, which can be approximated by different constants for different co-coupled modes in a certain wavelength range, and s is 1 for the same mode of the back coupling. The final frequency separation is independent of wavelength.
Seed gratings (typically long period fiber gratings) corresponding to homomode coupling: the obtained channel wavelength interval is
Figure BDA0001905591150000023
The obtained frequency interval is
Figure BDA0001905591150000024
Wherein Λ is the period of the seed grating, c is the speed of light in vacuum, and s is a waveguide dispersion correction factor related to the waveguide dispersion of different modes of the homodromous coupling, and can be approximated to different constants for different homodromous coupling modes within a certain wavelength range. The final frequency separation is independent of wavelength.
The fiber grating includes any same or different reverse mode coupling grating (typically a fiber bragg grating) and any same-mode coupling grating (typically a long-period fiber grating), but is not limited to a long-period fiber grating and a fiber bragg grating. The fiber grating comprises various optical fibers which can form the fiber grating, and can be single mode optical fibers, multimode optical fibers and other special optical fibers.
The process for preparing sampling grating and seed grating includes various optical fibre grating processes, such as ultraviolet and CO2Fiber gratings caused by irradiation, heating torsion and various physical phenomena, such as Brillouin gratings.
The manufacturing method provided by the invention only has the precision requirement of the common uniform grating on the control precision of the amplitude and the period of the refractive index change of the fiber grating preparation, and does not need a phase template. The characteristics of the realized multi-channel optical filter are as follows: the number of channels is more than 2; the channel spacing is equal in the frequency domain; channel gain disparity (disparity refers to the dB power difference between the maximum and minimum channel gains of different channels) of less than 1dB for a bandpass optical filter (referred to as the reflection spectrum) formed with a backward mode coupling grating (typically a bragg grating), and less than 3dB for a band-stop optical filter (referred to as the transmission spectrum) formed with a homomode coupling grating (typically a long period fiber grating) (disparity refers to the dB power difference between the maximum and minimum stop-band attenuations of different channels); the spectral characteristics of the multi-channel filter remain consistent and are determined by the spectral characteristics of the seed grating.
Wherein the single channel filter characteristic is determined by the spectrum of the seed grating. Then when the seed grating is a uniform grating, the characteristic of each channel filter in the multiple channels is a uniform grating filter characteristic. However, if the seed grating is a non-uniform grating having a specific filter spectrum characteristic, such as a flat-top filter, the multi-channel filter also has a corresponding filter characteristic.
When the seed grating is a homodromous mode coupling grating (typically a long period grating), the filter is a multi-channel band-stop filter (corresponding to a transmission spectrum); when the seed grating is a reverse mode coupled grating (typically a bragg grating), the filter is a multi-channel band-pass filter (corresponding to the reflection spectrum).
The design steps of the invention are as follows:
firstly, processing a sampling fiber grating with a longer period length according to a specially designed periodic slow-changing refractive index function, selecting the specially designed periodic slow-changing function according to the refractive index change, and determining the channel frequency interval of the finally formed multi-channel filter according to the period of the sampling grating. Different optimally designed periodic slow-varying functions are used for different channel numbers. If the second seed grating is a counter-coupled grating (typically a bragg grating), the optimally designed sampled grating index change function is expressed as follows:
Figure BDA0001905591150000031
d is a direct current constant part of the change of the refractive index of the sampling grating, J is a set factor of the number of channels, P is the period of the sampling grating, lambda is a set central wavelength determined by the period of the seed grating, and neffaverage effective refractive index of two coupled modes in the backward coupled seed grating, z is the position of the fiber grating, αn、θnAre optimized parameters for different channel number functions. The obtained channel wavelength interval is
Figure BDA0001905591150000032
The obtained frequency interval is
Figure BDA0001905591150000033
Wherein Λ is the period of the seed grating, c is the speed of light in vacuum, and s is a waveguide dispersion correction factor, which is related to the waveguide dispersion of different modes of the reverse coupling, and can be approximated to different constants for different homodromous coupling modes within a certain wavelength range, and s is 1 for the same mode of the reverse coupling. The final frequency separation is independent of wavelength.
If the second seed grating is a homodyne coupled grating (typically a long period grating), the refractive index variation function of the sampled grating is expressed as follows:
Figure BDA0001905591150000034
d is a direct current part of the sampling grating with refractive index change, the parameter is used for reducing the manufacturing difficulty of the sampling grating, J is a set factor of the number of channels, P is the period of the sampling grating, lambda is a set central wavelength, and delta neffthe difference between the effective refractive indices of two mode fields coupled in the same direction, z is the position of the fiber grating, αn、θnAre optimized parameters for different channel number functions. The obtained channel wavelength interval is
Figure BDA0001905591150000035
The obtained frequency interval is
Figure BDA0001905591150000036
Wherein Λ is the period of the seed grating, c is the speed of light in vacuum, and s is a waveguide dispersion correction factor related to the waveguide dispersion of the homodromous coupling mode, and can be approximated to different constants for different homodromous coupling modes within a certain wavelength range. The final frequency separation is independent of wavelength.
And secondly, processing a seed grating (a homodromous coupling or reverse coupling grating) with set spectral characteristics on the sampling fiber grating with the formed periodic slow refractive index change, wherein the period of the seed grating is less than 1/10 of that of the sampling grating. If the seed grating of the second step is a homodromous coupling grating, amplitude apodization can be further manufactured to reduce out-of-band radiation brought by reflection, and no special requirement is made on an apodization function.
The channel gain intensity of the finally formed multi-channel band-pass filter (corresponding to the reflection spectrum of the backward coupling grating) or multi-channel band-stop filter (corresponding to the transmission spectrum of the same-direction coupling grating) mainly depends on the refractive index change (alternating current coupling coefficient) of the seed grating, and the interval and gain consistency of the multi-channel optical filter mainly depends on the refractive index change control precision of the sampling fiber grating formed by first processing. The second-time formed seed grating needs to be overlapped with the first-time formed sampling fiber grating in space position, the forming area of the seed fiber grating can be smaller than that of the sampling fiber grating, and the starting position and the ending position of the seed grating and the sampling grating do not need to be completely aligned.
The above first and second steps may be interchanged in order.
Has the advantages that: the invention has simple structure and manufacturing method, can be realized on the traditional fiber grating processing equipment, and overcomes the defects that the traditional multichannel optical filter realized by periodic alternating current modulation cannot obtain equal channel gain characteristics, and the multichannel optical filter designed by a layered peeling or multi-parameter optimization method is difficult to realize or has high realization cost and needs an expensive high-precision phase template.
Drawings
FIG. 1 is a diagram of a DC modulated fiber grating structure, which includes two gratings with sampling and seed periods with large difference;
FIG. 2 is a periodic slow-varying function, i.e., a sampling grating refractive index variation function, required for implementing a 3-channel uniform fiber grating filter, using a homodromous coupling grating (taking a long-period fiber grating as an example) as a seed grating;
FIG. 3 is a 3-channel uniform fiber grating filter implemented by using a homodromous coupling grating (taking a long-period fiber grating as an example) as a seed grating;
fig. 4 is a periodic slow-varying function, i.e., a sampling grating refractive index variation function, required by a 3-channel uniform fiber grating filter implemented by using a reverse coupling grating (taking a bragg fiber grating as an example) as a seed grating;
FIG. 5 shows a 3-channel uniform fiber grating filter implemented with a reverse coupling grating (e.g., Bragg fiber grating) as a seed grating;
fig. 6 is a periodic slow-varying function, i.e., a sampling grating refractive index variation function, required by a 9-channel uniform fiber grating filter implemented by using a reverse coupling grating (taking a bragg fiber grating as an example) as a seed grating;
fig. 7 shows a 9-channel uniform fiber grating filter implemented by using a reverse coupling grating (taking a bragg fiber grating as an example) as a seed grating.
Detailed Description
The invention is explained in more detail below with reference to the drawings and exemplary embodiments.
Example 1: the 3-channel uniform optical filter is realized by taking a homodromous coupling grating, a long-period fiber grating as an example, as a seed grating.
The structure of fig. 1 is adopted, wherein the seed grating adopts a long-period fiber grating with a period of 300um and coupled in the same direction, the resonance wavelength of the long-period fiber grating is 1560nm (the resonance wavelength position of the long-period fiber grating can be adjusted by the period of the seed grating), and the grating length is L ═ 6 cm.
The sampled grating uses the following index change function:
ΔnDC-LPG(z)＝2.9342×10-4·sin(2πz/P)
the period of the sampling grating is 1.5cm, and the refraction change function of the sampling grating is shown in fig. 2. The wavelength interval delta lambda of the finally formed multichannel filter is 31.2nm, the frequency spectrum is shown in figure 3, the channel inconsistency of the transmission spectrum of the band-stop filter is about 0.2dB, and the cross spectrum is used for comparison reference.
Example 2: 3-channel uniform optical filter realized on reverse coupling grating (taking Bragg fiber grating as example)
The structure of fig. 1 is adopted, wherein the seed grating adopts a reverse-coupled bragg fiber grating with the period of 0.5345um, the grating length is 1.07cm, and the resonance wavelength is 1550nm (the resonance is thereof)The wavelength position can be adjusted by the period of the seed grating), the apodization function is selected to be sin2(πz/L)。
The refractive index change formula of the sampling fiber grating is as follows:
ΔnDC-FBG(z)＝5.85×10-4·sin(2πz/P)
where the period of the sampling grating is P ═ 1mm, the refraction change function of the sampling grating is shown in fig. 4.
The wavelength interval delta lambda of the finally formed multichannel filter is 0.8nm, the frequency spectrum is shown in figure 5, the channel inconsistency of the reflection spectrum of the band-pass filter is 0.02dB, and the transmission spectrum is used for comparison reference.
Example 3: 9-channel uniform optical filter realized on reverse coupling grating (taking Bragg fiber grating as example)
The structure of fig. 1 is adopted, wherein the seed grating adopts a reverse-coupled bragg fiber grating with the period of 0.5345um, the grating length is 1.07cm, the resonance wavelength is 1550nm (the resonance wavelength position can be adjusted by the period of the seed grating), and the apodization function is selected to be sin2(πz/L)。
The refractive index change formula of the sampling fiber grating is as follows:
ΔnDC(z)＝3.8751×10-4[-2.935cos(W)-1.16sin(2W)-1.26cos(3W)+1.272sin(4W)+0.855cos(5W)]
the period of the sampled grating is P2 mm, and the refraction change function of the sampled grating is shown in fig. 6.
The resulting multichannel filter has a wavelength separation Δ λ of 0.4nm, a spectrum as shown in fig. 7, and a channel non-uniformity of about 0.02dB for the reflection spectrum (band pass filter), and a transmission spectrum for comparison reference.
The manufacturing conditions under various parameters are exemplified above, and the design effects of the multi-channel band-stop filter in the homodromous coupling grating (taking long period grating as an example) and the multi-channel band-pass filter in the counter coupling grating (taking bragg grating as an example) are respectively realized, but the patent is not limited to the above exemplified conditions.

Claims (8)

1.一种基于直流调制的多通道光纤光栅滤波器，其特征在于：在一根光纤上分别形成周期长度相差为10倍以上的采样、种子两种光纤光栅，所述种子光纤光栅采用同向耦合光纤光栅或反向耦合光纤光栅，所述采样光纤光栅的折射率变化根据同向耦合种子光纤光栅或反向耦合种子光纤光栅的不同采用对应的周期性折射率变化函数，其折射率变化对种子光纤光栅的折射率变化的直流部分起慢调制作用，以形成均匀的信道间隔和信道增益的多通道光学滤波器；1. A multi-channel fiber grating filter based on DC modulation, characterized in that: two kinds of fiber gratings with a period length difference of more than 10 times and a seed are respectively formed on an optical fiber, and the seed fiber grating adopts the same direction. Coupling fiber grating or reverse coupling fiber grating, the refractive index change of the sampling fiber grating adopts the corresponding periodic refractive index change function according to the difference between the co-coupling seed fiber grating or the reverse coupling seed fiber grating, and the refractive index change is equal to The DC part of the refractive index change of the seed fiber grating acts as a slow modulation to form a multi-channel optical filter with uniform channel spacing and channel gain; 所述采样光纤光栅中采用的折射率变化函数，其对应于反向模式耦合的种子光纤光栅为优化幅度和相位的周期性正弦或余弦函数和直流常量的组合，表示为：The refractive index change function used in the sampling fiber grating, which corresponds to the reverse mode coupled seed fiber grating is a combination of a periodic sine or cosine function and a DC constant that optimizes the amplitude and phase, and is expressed as:
Figure FDA0002443863930000011
Figure FDA0002443863930000011
 其中，D为采样光纤光栅折射率变化直流部分，J为通道数设定因子，P为采样光纤光栅的周期，λ为由种子光纤光栅周期确定的设定中心波长，neff为反向耦合种子光纤光栅中的两个耦合模式的平均有效折射率，z为采样光纤光栅的位置，αn、θn为针对不同通道数函数的最优化参数；获得的通道波长间隔为
Figure FDA0002443863930000012
获得的频率间隔为
Figure FDA0002443863930000013
其中Λ为种子光纤光栅周期，c为真空中的光速，该频率间隔与波长无关；Among them, D is the DC part of the refractive index change of the sampling fiber grating, J is the channel number setting factor, P is the period of the sampling fiber grating, λ is the set center wavelength determined by the period of the seed fiber grating, and n eff is the reverse coupling seed The average effective refractive index of the two coupling modes in the fiber grating, z is the position of the sampling fiber grating, α n , θ n are the optimized parameters for different channel number functions; the obtained channel wavelength interval is
Figure FDA0002443863930000012
The frequency interval obtained is
Figure FDA0002443863930000013
where Λ is the period of the seed fiber grating, c is the speed of light in vacuum, and the frequency interval has nothing to do with the wavelength; 所述采样光纤光栅中采用的折射率变化函数，其对应于同向模式耦合的种子光纤光栅为优化幅度和相位的周期性正弦或余弦函数和直流常量的组合，表示为：The refractive index change function used in the sampling fiber grating, which corresponds to the seed fiber grating coupled in the same direction, is a combination of a periodic sine or cosine function with optimized amplitude and phase and a DC constant, expressed as:
Figure FDA0002443863930000014
Figure FDA0002443863930000014
 其中，D为采样光纤光栅折射率变化直流部分，J为通道数设定因子，P为采样光纤光栅的周期，λ为由种子光纤光栅周期确定的设定中心波长，Δneff为同向耦合的两个模式的有效折射率之差，z为采样光纤光栅的位置，αn、θn为针对不同通道数函数的最优化参数；获得的通道波长间隔为
Figure FDA0002443863930000015
获得的频率间隔为
Figure FDA0002443863930000016
其中Λ为种子光纤光栅周期，c为真空中的光速，s为波导色散修正因子，该频率间隔与波长无关。Among them, D is the DC part of the refractive index change of the sampling fiber grating, J is the channel number setting factor, P is the period of the sampling fiber grating, λ is the set center wavelength determined by the period of the seed fiber grating, Δn eff is the co-coupling The difference between the effective refractive indices of the two modes, z is the position of the sampling fiber grating, α n , θ n are the optimized parameters for different channel number functions; the obtained channel wavelength interval is
Figure FDA0002443863930000015
The frequency interval obtained is
Figure FDA0002443863930000016
where Λ is the period of the seed fiber grating, c is the speed of light in vacuum, and s is the waveguide dispersion correction factor, and the frequency interval is independent of the wavelength. 2.根据权利要求1所述的基于直流调制的多通道光纤光栅滤波器，其特征在于：所述滤波器频率间隔由采样光纤光栅的周期设定，所述滤波器的中心波长由种子光纤光栅的周期设定。2. The multi-channel fiber grating filter based on DC modulation according to claim 1, wherein the frequency interval of the filter is set by the period of the sampling fiber grating, and the center wavelength of the filter is set by the seed fiber grating cycle setting. 3.根据权利要求1所述的基于直流调制的多通道光纤光栅滤波器，其特征在于：所述通道之间的间隔在频率域为等间隔。3 . The multi-channel fiber grating filter based on DC modulation according to claim 1 , wherein the intervals between the channels are equal intervals in the frequency domain. 4 . 4.根据权利要求1所述的基于直流调制的多通道光纤光栅滤波器，其特征在于：所述通道滤波器的频谱特性与种子光纤光栅频谱特性一致。4 . The multi-channel fiber grating filter based on DC modulation according to claim 1 , wherein the spectral characteristics of the channel filter are consistent with the spectral characteristics of the seed fiber grating. 5 . 5.根据权利要求1所述的基于直流调制的多通道光纤光栅滤波器，其特征在于：所述种子光纤光栅包含任意同向模式耦合的光纤光栅。5 . The multi-channel fiber grating filter based on DC modulation according to claim 1 , wherein the seed fiber grating comprises any fiber grating coupled in the same direction. 6 . 6.根据权利要求1所述的基于直流调制的多通道光纤光栅滤波器，其特征在于：所述种子光纤光栅包含任意同一或不同反向模式耦合的光纤光栅。6 . The multi-channel fiber grating filter based on DC modulation according to claim 1 , wherein the seed fiber grating comprises any fiber grating coupled with the same or different reverse modes. 7 . 7.根据权利要求1所述的基于直流调制的多通道光纤光栅滤波器，其特征在于：所述制作种子光纤光栅的光纤包括单模光纤、多模光纤和其他特殊光纤。7 . The multi-channel fiber grating filter based on DC modulation according to claim 1 , wherein the fiber for making the seed fiber grating comprises single-mode fiber, multi-mode fiber and other special fibers. 8 . 8.一种采用如权利要求1至7中任一项所述的基于直流调制的多通道光纤光栅滤波器的制作步骤，其特征在于：在同一根光纤上分别制作具有特殊周期性折射率变化函数特性的采样光纤光栅和普通光纤光栅特性的种子光纤光栅，种子、采样光纤光栅的制作顺序可交换。8. A production step of adopting the multi-channel fiber grating filter based on DC modulation as claimed in any one of claims 1 to 7, wherein: on the same fiber, a special periodic refractive index change is produced respectively Sampling fiber gratings with functional characteristics and seed fiber gratings with common fiber grating characteristics, the production order of seeds and sampling fiber gratings can be exchanged.
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