CN108169856A - A kind of compensation method of Wavelength Dependent Loss and fixed optical attenuator - Google Patents
A kind of compensation method of Wavelength Dependent Loss and fixed optical attenuator Download PDFInfo
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- CN108169856A CN108169856A CN201810049542.6A CN201810049542A CN108169856A CN 108169856 A CN108169856 A CN 108169856A CN 201810049542 A CN201810049542 A CN 201810049542A CN 108169856 A CN108169856 A CN 108169856A
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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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
- G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
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- Optics & Photonics (AREA)
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Abstract
Compensation method and fixed optical attenuator the embodiment of the invention discloses a kind of Wavelength Dependent Loss.This method is applied to fixed optical attenuator, including：Obtain the target compensation function of the fixed optical attenuator；Optimization simulation calculation is carried out to the target compensation function, obtains multiple target chirp parameters of target chirped fiber grating；The target chirped fiber grating is scribed according to the multiple target chirp parameter；The target chirped fiber grating is installed on the fixed optical attenuator, is compensated with the Wavelength Dependent Loss to the fixed optical attenuator.The compensation method of Wavelength Dependent Loss provided in an embodiment of the present invention compensates the Wavelength Dependent Loss of fixed optical attenuator by installing a chirp grating in fixed optical attenuator, can improve the transmission performance of fixed optical attenuator.
Description
Technical field
The present embodiments relate to technical field of optical fiber communication more particularly to a kind of Wavelength Dependent Loss compensation method and
Fixed optical attenuator.
Background technology
Optical attenuator is widely used in the occasions such as short distance fiber optic communication and optical communication system performance test, and effect is
A degree of attenuation is realized to luminous power.It is whether adjustable according to attenuation, optical attenuator can be divided into adjustable optical attenuator and
Fixed optical attenuator.The attenuation of adjustable optical attenuator can be adjusted in a certain range, and the attenuation of fixed optical attenuator is not
It is variable.The method for realizing attenuation is typically to introduce certain length, have the attenuating fiber of certain attenuation coefficient or in optical fiber
Certain transverse direction or axial offset are artificially introduced during docking, the output mould field of two optical fiber of docking is made to generate certain mismatch
Amount.
Whether adjustable optical attenuator or fixed optical attenuator, a critically important index is Wavelength Dependent Loss
(Wavelength Dependent Loss, WDL), the maximum attenuation being defined as in the operating wavelength range of optical attenuator
The difference of amount and minimal attenuation amount.Due to the presence of WDL, the luminous power of each wavelength in the service band of optical fiber telecommunications system
It can be different.The signal noise ratio (Signal to Noise Ratio, SNR) of each wavelength is caused to have differences, so that respectively
The bit error rate (Bit Error Rate, BER) of wavelength is different, influences the transmission performance and test result of system.Therefore, reduce
The WDL of optical attenuator realizes that attenuation curve planarization seems very necessary.
Invention content
The embodiment of the present invention provides compensation method and the fixed optical attenuator of a kind of Wavelength Dependent Loss, with to fixed light decay
The Wavelength Dependent Loss for subtracting device compensates, and can improve the transmission performance of fixed optical attenuator.
In a first aspect, an embodiment of the present invention provides a kind of compensation method of Wavelength Dependent Loss, this method is applied to solid
Determine optical attenuator, including：
Obtain the target compensation function of the fixed optical attenuator；
Optimization simulation calculation is carried out to the target compensation function, obtains multiple target Zhou of target chirped fiber grating
It sings parameter；
The target chirped fiber grating is scribed according to the multiple target chirp parameter；
The target chirped fiber grating is installed on the fixed optical attenuator, with the wave to the fixed optical attenuator
Long dependent loss compensates.
Further, the target compensation function for obtaining the fixed optical attenuator, including：
The fixed optical attenuator is tested, obtains the attenuation curve function of the fixed optical attenuator；
Obtain the target pad value of the fixed optical attenuator；
Obtain the attenuation flow function of chirped fiber grating；
Target compensation function is determined according to the attenuation curve function, the target pad value and the attenuation flow function.
Further, the expression formula of the target compensation function for the attenuation curve function with it is described attenuation flow function it
With equal to the target pad value.
Further, the attenuation flow function for obtaining chirped fiber grating, including：
The transmission matrix of chirped fiber grating is obtained using transfer matrix method；
The expression formula of the reflectivity of the chirp grating, the expression formula profit of the reflectivity are obtained according to the transmission matrix
It is characterized with operation wavelength；
The attenuation flow function of the chirp grating is obtained according to the expression formula of the reflectivity.
Further, after the target pad value for obtaining the fixed optical attenuator, including：
Target attenuation accuracy range is determined according to the target attenuation；
Correspondingly, determine that target is mended according to the attenuation curve function, the target pad value and the attenuation flow function
Function is repaid, including：
Target compensation is determined according to the attenuation curve function, the target attenuation accuracy range and the attenuation flow function
Function.
Further, the target chirped fiber grating is scribed according to the multiple target chirp parameter, including：
It is determined to scribe parameter according to the multiple target chirp parameter, the parameter of scribing includes uv-exposure intensity and purple
The outer time for exposure；
The target chirped fiber grating is scribed according to the parameter of scribing.
Further, it is described that the target chirped fiber grating is installed on the fixed optical attenuator, including：
The target chirped fiber grating is fixed on using hot-setting adhesive in a ceramic insertion core, obtains grating ceramic insertion core；
Two end faces of the grating ceramic insertion core are ground respectively, are inserted with obtaining target face type grating ceramics
Core；
The target face type grating ceramic insertion core is installed in the ceramic sleeve of the fixed optical attenuator.
Second aspect, the embodiment of the present invention additionally provide a kind of fixed optical attenuator, which includes：Flange
Formula fixed optical attenuator and grating ceramic insertion core, the grating ceramic insertion core are installed on the pottery of the flange form fixed optical attenuator
In insulator cylinder.
Further, the flange form fixed optical attenuator includes shell, ceramic sleeve and washer；The ceramic sleeve passes through
The shell is worn, the washer is positioned in the ceramic sleeve；The grating ceramic insertion core includes chirp grating and ceramics are inserted
Core, the chirp grating are located in the ceramic insertion core, and the grating ceramic insertion core is adjacent with the washer.
Further, the grating ceramic insertion core end face adjacent with the washer is APC types.
The embodiment of the present invention, first obtain fixed optical attenuator target compensation function, then to target compensation function into
Row optimizes simulation calculation, multiple target chirp parameters of target chirped fiber grating is obtained, subsequently according to multiple target Zhou
Parameter of singing scribes target chirped fiber grating, target chirped fiber grating finally is installed on fixed optical attenuator, with to fixation
The Wavelength Dependent Loss of optical attenuator compensates.The compensation method of Wavelength Dependent Loss provided in an embodiment of the present invention, passes through
One chirp grating in fixed optical attenuator is installed to compensate the Wavelength Dependent Loss of fixed optical attenuator, fixed light can be improved
The transmission performance of attenuator.
Description of the drawings
A kind of flow chart of the compensation method of Wavelength Dependent Loss in Fig. 1 embodiment of the present invention one；
Fig. 2 a are a kind of attenuation of fixed optical attenuator in the embodiment of the present invention one and target pad value homologous thread
The schematic diagram of relationship；
Fig. 2 b are the attenuation of another fixed optical attenuator in the embodiment of the present invention one and target pad value homologous thread
Relationship schematic diagram；
Fig. 3 is a kind of flow chart of the compensation method of Wavelength Dependent Loss in the embodiment of the present invention two；
Fig. 4 is a kind of schematic diagram that chirped fiber grating is divided into subset in the embodiment of the present invention two；
Fig. 5 a are a kind of structure diagrams of fixed optical attenuator in the embodiment of the present invention three；
Fig. 5 b are a kind of structure diagrams of grating ceramic insertion core in the embodiment of the present invention three；
Fig. 5 c are a kind of flange form fixed optical attenuators for not installing chirped fiber grating in the embodiment of the present invention three.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrated only in description, attached drawing.
Embodiment one
The flow chart of the compensation method of a kind of Wavelength Dependent Loss that Fig. 1 is provided for the embodiment of the present invention one, the present embodiment
Situation about being compensated to the wavelength relevant parameter of fixed optical attenuator is applicable to, as shown in Figure 1, this method includes following step
Suddenly.
Step 110, the target compensation function of fixed optical attenuator is obtained.
Wherein, the attenuation of fixed optical attenuator is the attenuation packet of fixed immutable, common fixed optical attenuator
Include 1dB, 3dB, 5dB, 7dB, 10dB, 15dB, 20dB and 25dB.Target compensation function can characterize declining for fixed optical attenuator
Decrement target pad value to be achieved function expression.In the present embodiment, target compensation function can be by fixed light decay
The target pad value for subtracting the attenuation curve function of device, the attenuation flow function of chirped fiber grating and fixed optical attenuator is composed
Mathematic(al) representation.
Optionally, obtaining the process of the target compensation function of fixed optical attenuator can be, fixed optical attenuator is carried out
Test obtains the attenuation curve function of fixed optical attenuator, obtains the target pad value of fixed optical attenuator, obtains chirped fiber
The attenuation flow function of grating determines target compensation function according to attenuation curve function, target pad value and attenuation flow function.
Wherein, obtaining the mode of the attenuation curve function of fixed optical attenuator can be, be built using fixed optical attenuator
Fixed optical attenuator is connected on wideband light source and spectrometer by light path, and the light that wideband light source generates passes through fixed optical attenuator
Into spectrometer, the attenuation curve of fixed optical attenuator is shown on spectrometer, attenuation curve is fitted acquisition attenuation curve
Function.Target pad value is the value that user is set according to actual demand, can be a constant.Obtain declining for chirped fiber grating
The mode of decrement function can be that the attenuation flow function of fiber grating is obtained using transfer matrix method.
Optionally, the expression formula of target compensation function is equal to target for the sum of attenuation curve function and attenuation flow function and decays
Value.It is exemplary, it is assumed that the attenuation curve function of fixed attenuator is Att1(λ), target pad value are A0, the attenuation of chirp grating
Flow function is Att2(λ), then the expression formula of target compensation function is Att1(λ)+Att2(λ)=A0.Under this application scene, Gu
Determine the attenuation curve function Att of optical attenuator1(λ) and target pad value A0Between need to meet Att1(λ)-A0≤ 0 permanent establishment
Condition, i.e., in the operating wavelength range of fixed optical attenuator, the attenuation curve of fixed optical attenuator is maintained at target pad value
The lower section of homologous thread, as shown in Figure 2 a, Fig. 2 a be a kind of attenuation of fixed optical attenuator that provides of the embodiment of the present invention one with
The schematic diagram of the relationship of target pad value homologous thread.If the attenuation curve function Att of fixed optical attenuator1(λ) declines with target
Depreciation A0Between cannot meet Att1(λ)-A0≤ 0 permanent condition set up, i.e., in the operating wavelength range of fixed optical attenuator,
The attenuation curve of fixed optical attenuator has part in the top of target pad value homologous thread, as shown in Figure 2 b, Fig. 2 b present invention
The attenuation for another fixed optical attenuator that embodiment one provides and the schematic diagram of the relationship of target pad value homologous thread.This
When, it needs to finely tune the parameter of fixed optical attenuator, such as the appropriate transverse direction for reducing docking optical fiber or axile displacement amount or suitable
When the length for reducing attenuating fiber, to reduce attenuation so that attenuation curve function Att1(λ) and target pad value A0Between it is full
Sufficient Att1(λ)-A0≤ 0 permanent condition set up.
Optionally, it after the target pad value for obtaining fixed optical attenuator, further includes：Mesh is determined according to target attenuation
Mark attenuation accuracy range.Correspondingly, target compensation letter is determined according to attenuation curve function, target pad value and attenuation flow function
Number, including：Target compensation function is determined according to attenuation curve function, target attenuation accuracy range and attenuation flow function.
Wherein, target attenuation accuracy range sets the actual demand of precision according to user, illustratively, it is assumed that mesh
Mark pad value is A0, then aimed at precision range can be expressed as [A0-ΔA1, A0+ΔA2].The expression formula of target compensation function is
A0-ΔA1≤Att1(λ)+Att2(λ)≤A0+ΔA2。
Step 120, optimization simulation calculation is carried out to target compensation function, obtains multiple mesh of target chirped fiber grating
Mark chirp parameter.
Wherein, chirp parameter can be the parameter for characterizing chirped fiber grating structure feature, can include chirped fiber light
Mean refractive index knots modification, fringe visibility, screen periods and the chirp value of grid fibre core.In target compensation function, multiple Zhou
Parameter of singing is independent variable, assigns different value respectively to multiple chirp parameters, then can obtain different target compensation functional values.Right
During target compensation function carries out optimization simulation calculation, the value of multiple chirp parameters is constantly adjusted, when target compensation letter
When numerical value is fallen into the range of target attenuation accuracy, chirp parameter at this time is target chirp parameter.
Step 130, target chirped fiber grating is scribed according to multiple target chirp parameters.
Specifically, target chirp parameter is the parameter of target chirped fiber grating.Obtaining multiple target chirp parameters
Afterwards, it is possible to scribe target chirped fiber grating according to multiple target chirp parameters.
In the present embodiment, scribing target chirped fiber grating according to multiple target chirp parameters can be by following manner reality
It applies：It determines to scribe parameter according to multiple target chirp parameters, scribes parameter and include uv-exposure intensity and uv-exposure time, most
Basis scribes parameter and scribes target chirped fiber grating afterwards.
Step 140, target chirped fiber grating is installed on fixed optical attenuator, with the wavelength phase to fixed optical attenuator
Loss is closed to compensate.
Specifically, after target chirped fiber grating has been scribed, target chirped fiber grating is installed on fixed optical attenuation
In device, the Wavelength Dependent Loss of fixed optical attenuator is compensated with realizing.In the present embodiment, when light is by being mounted with target
During the fixed optical attenuator of chirped fiber grating, target chirped fiber grating can be to the Wavelength Dependent Loss of fixed optical attenuator
It compensates, so as to planarize the attenuation curve of fixed optical attenuator.
Optionally, target chirped fiber grating is installed on fixed optical attenuator, can be implemented by following manner：By target
Chirped fiber grating is fixed on using hot-setting adhesive in a ceramic insertion core, obtains grating ceramic insertion core；To the two of grating ceramic insertion core
A end face is ground respectively, to obtain target face type grating ceramic insertion core；Target face type grating ceramic insertion core is installed
In in the ceramic sleeve of fixed optical attenuator.
Wherein target face type can be angle physical contact type (Angled Physical Contact, APC) or surpass
Grade physical contact type (Ultra Physical Contact, UPC).The outer diameter of ceramic insertion core is according to the ceramics of fixed optical attenuator
The specification of sleeve determines, such as can be 1.25mm, 2.5mm of standard or the nonstandard lock pin of other sizes.Specifically
, target chirped fiber grating is installed on to the process of fixed optical attenuator to be, hot-setting adhesive is injected in ceramic insertion core, so
Target chirped fiber grating is penetrated in ceramic insertion core afterwards, then by glue curing, after the completion of curing, grating ceramics is obtained and inserts
Then two end faces of ceramic insertion core are ground by core together with the end face of the optical fiber of the inside, until being ground to target face type.
After the completion of grinding, grating ceramic insertion core is installed in the ceramic sleeve of fixed optical attenuator and fixed.
The technical solution of the present embodiment obtains the target compensation function of fixed optical attenuator, then to target compensation first
Function carries out optimization simulation calculation, multiple target chirp parameters of target chirped fiber grating is obtained, subsequently according to multiple
Target chirp parameter scribes target chirped fiber grating, and target chirped fiber grating finally is installed on fixed optical attenuator, with
The Wavelength Dependent Loss of fixed optical attenuator is compensated.The compensation side of Wavelength Dependent Loss provided in an embodiment of the present invention
Method compensates the Wavelength Dependent Loss of fixed optical attenuator, Ke Yiti by installing a chirp grating in fixed optical attenuator
The transmission performance of high fixed optical attenuator.
Embodiment two
Fig. 3 is a kind of flow chart of the compensation method of Wavelength Dependent Loss provided by Embodiment 2 of the present invention.Such as Fig. 3 institutes
Show, obtaining the attenuation flow function of chirped fiber grating can be implemented by following manner.
Step 210, the transmission matrix of chirped fiber grating is obtained using transfer matrix method.
Step 220, the expression formula of the reflectivity of chirp grating is obtained according to transmission matrix, the expression formula of reflectivity utilizes work
It is characterized as wavelength.
Step 230, the attenuation flow function of chirp grating is obtained according to the expression formula of reflectivity.
Specifically, the length of chirped fiber grating is L, its fiber core refractive index is n before uv-exposure0, uv-exposure obtains
The fibre core effective refractive index n of the chirped fiber grating arrivedeffAlong the distribution function such as following formula of optical grating axial z：In formula, 0≤z≤L, δ n (z) are light
Refractive index modulation depth at grid fibre core z, δ n0(z) it is the mean refractive index knots modification at z, the order of magnitude is 10-5~10-3, v (z)
For the fringe visibility at z, value range is screen periods for 0~1, Λ, generally hundreds of nanometers,It is right for chirp value
In period uniform gratingIt is linear chirp grating for the periodFor constant.
Transfer matrix method can be used to the analysis of the attenuation of chirped fiber grating, by the chirped fiber grating that length is L
It is divided into the subset of N number of equal length, thousands of to tens thousand of, subset each in this way can be come closely N values with uniform fiber grating
Like processing.Illustratively, Fig. 4 is a kind of signal that chirped fiber grating is divided into subset provided by Embodiment 2 of the present invention
Figure.The effective refractive index of kth (k=1,2,3 ... ..., N-1, N) a subset, centre wavelength, fringe visibility, mean refractive index
Knots modification takes the subset center respectivelyThe parameter n at placeeff(k)、λD(k)、v(k)、δn0(k).Then k-th subset
Transmission matrix TkIt is represented by：
In formula,
So, the transmission matrix of entire chirped fiber grating is：Chirped fiber grating
Reflectance factor and the functional relation of operation wavelength beThe reflectivity of chirped fiber grating and operation wavelength
Functional relation for R (λ)=| r (λ) |2, then the attenuation flow function of chirped fiber grating is Att2(λ)=- 10lg (1-R (λ)).
The expression formula of target compensation function is A0-ΔA1≤Att1(λ)+Att2(λ)≤A0+ΔA2.δ n in formula0(z)、v
(z), Λ andTarget chirp parameter for solution.
Embodiment three
Fig. 5 a are the structure diagram of a kind of fixed optical attenuator that the embodiment of the present invention three provides.As shown in Figure 5 a, should
Fixed optical attenuator includes：Flange form fixed optical attenuator 310 and grating ceramic insertion core 320, grating ceramic insertion core 320 are installed on
In the ceramic sleeve of flange form fixed optical attenuator 310.
Optionally, flange form fixed optical attenuator 310 includes shell 311, ceramic sleeve 312 and washer 313.Wherein, method
Blue formula fixed optical attenuator 310 is used cooperatively with two optical fiber connectors 314, and ceramic sleeve 312 runs through shell 311, washer 313
It is positioned in ceramic sleeve 312.Grating ceramic insertion core 320 is adjacent with washer 313.Fig. 5 b are one that the embodiment of the present invention three provides
The structure diagram of kind grating ceramic insertion core, as shown in Figure 5 b, grating ceramic insertion core 320 includes chirp grating 321 and ceramics are inserted
Core 322, chirp grating 321 are located in ceramic insertion core 322.Fig. 5 c are that the one kind provided for the embodiment of the present invention three does not install chirp
The flange form fixed optical attenuator of fiber grating, as shown in Figure 5 c, flange form fixed optical attenuator 310 include shell 311, ceramics
Sleeve 312 and washer 313.Ceramic sleeve 312 runs through shell 311, and washer 313 is positioned in ceramic sleeve 312.Flange form is fixed
Optical attenuator 310 is used cooperatively with two optical fiber connectors 314.
Note that it above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiment described here, can carry out for a person skilled in the art various apparent variations,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
It can include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of compensation method of Wavelength Dependent Loss, which is characterized in that applied to fixed optical attenuator, including：
Obtain the target compensation function of the fixed optical attenuator；
Optimization simulation calculation is carried out to the target compensation function, obtains multiple target chirps ginseng of target chirped fiber grating
Number；
The target chirped fiber grating is scribed according to the multiple target chirp parameter；
The target chirped fiber grating is installed on the fixed optical attenuator, with the wavelength phase to the fixed optical attenuator
Loss is closed to compensate.
2. compensation method according to claim 1, which is characterized in that the target for obtaining the fixed optical attenuator is mended
Function is repaid, including：
The fixed optical attenuator is tested, obtains the attenuation curve function of the fixed optical attenuator；
Obtain the target pad value of the fixed optical attenuator；
Obtain the attenuation flow function of chirped fiber grating；
Target compensation function is determined according to the attenuation curve function, the target pad value and the attenuation flow function.
3. compensation method according to claim 2, which is characterized in that the expression formula of the target compensation function declines to be described
Subtract the sum of curvilinear function and the attenuation flow function and be equal to the target pad value.
4. compensation method according to claim 2, which is characterized in that the attenuation letter for obtaining chirped fiber grating
Number, including：
The transmission matrix of chirped fiber grating is obtained using transfer matrix method；
The expression formula of the reflectivity of the chirp grating is obtained according to the transmission matrix, the expression formula of the reflectivity utilizes work
It is characterized as wavelength；
The attenuation flow function of the chirp grating is obtained according to the expression formula of the reflectivity.
5. compensation method according to claim 2, which is characterized in that in the target attenuation for obtaining the fixed optical attenuator
After value, including：
Target attenuation accuracy range is determined according to the target attenuation；
Correspondingly, target compensation letter is determined according to the attenuation curve function, the target pad value and the attenuation flow function
Number, including：
Target compensation letter is determined according to the attenuation curve function, the target attenuation accuracy range and the attenuation flow function
Number.
6. compensation method according to claim 1, which is characterized in that according to being scribed the multiple target chirp parameter
Target chirped fiber grating, including：
It is determined to scribe parameter according to the multiple target chirp parameter, the parameter of scribing includes uv-exposure intensity and ultraviolet exposure
Between light time；
The target chirped fiber grating is scribed according to the parameter of scribing.
7. compensation method according to claim 1, which is characterized in that described to be installed on the target chirped fiber grating
The fixed optical attenuator, including：
The target chirped fiber grating is fixed on using hot-setting adhesive in a ceramic insertion core, obtains grating ceramic insertion core；
Two end faces of the grating ceramic insertion core are ground respectively, to obtain target face type grating ceramic insertion core；
The target face type grating ceramic insertion core is installed in the ceramic sleeve of the fixed optical attenuator.
8. a kind of fixed optical attenuator, which is characterized in that including：Flange form fixed optical attenuator and grating ceramic insertion core, it is described
Grating ceramic insertion core is installed in the ceramic sleeve of the flange form fixed optical attenuator.
9. fixed optical attenuator according to claim 8, which is characterized in that the flange form fixed optical attenuator includes outer
Shell, ceramic sleeve and washer；The ceramic sleeve runs through the shell, and the washer is positioned in the ceramic sleeve；It is described
Grating ceramic insertion core includes chirp grating and ceramic insertion core, and the chirp grating is located in the ceramic insertion core, the grating pottery
Porcelain lock pin is adjacent with the washer.
10. fixed optical attenuator according to claim 9, which is characterized in that the grating ceramic insertion core and the washer
Adjacent end face is APC types.
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| CN201810049542.6A CN108169856B (en) | 2018-01-18 | 2018-01-18 | Wavelength-dependent loss compensation method and fixed optical attenuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110362880A (en) * | 2019-06-25 | 2019-10-22 | 西安交通大学 | Optical fiber attenuation characteristic multiple physical field emulation modelling method in a kind of OPLC cable |
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