KR20030002679A - A sampled fiber grating filter and its fiber grating systems - Google Patents

Abstract

PURPOSE: A sampled fiber grating filter and a fiber grating system using the same are provided, which realizes a fiber grating having a characteristics of multi peaks by varying a transmission and reflection spectrum of the fiber grating by applying a pressure(strain) or a force periodically or nonperiodically to the fiber grating or a part of the fiber grating. CONSTITUTION: A sampled fiber grating filter(SFGF) includes a fiber(10) formed with a fiber grating(20) having a random refractive index, and a pressure member, and a supporting plate fixing and supporting the fiber. The pressure member has a pressure rugged part pressing a random area of the fiber grating and having a random angle as to a propagation direction of a fiber waveguide to generate a multi peak in a reflection and transmission spectrum of the fiber grating by varying the refractive index of the fiber grating. The fiber grating has at least more than one different refractive indexes.

Description

Sampled fiber grating filter and its fiber grating systems}

The present invention relates to a sampled optical fiber grating filter and an optical fiber grating system using the same, in particular by applying pressure (strain) or force from the outside to the optical fiber grating or a portion of the optical fiber grating already made in the optical fiber periodically or aperiodically A sampled optical fiber grating filter which can realize an optical fiber grating having multiple peak characteristics by changing the refractive index distribution in the optical fiber grating and use the same to change the transmission or reflection spectrum of the optical fiber grating and use it in various optical communication devices and optical systems. It relates to an optical fiber grating system using the same.

The optical fiber grating is an optical device having a shape in which the refractive index of the optical fiber core changes periodically. Since the optical fiber grating is manufactured in the optical fiber core, the optical fiber grating has a low insertion loss and excellent performance as a filter, compared to other bulk devices. . Many kinds of optical fiber gratings have been introduced to apply the advantages of the optical fiber gratings to various application devices and systems, and the research on sampled gratings having double peak characteristics has been actively conducted.

A sample grating is a kind of special optical grating with reflection peaks at regular channel intervals, and it is the gain of the current wavelength division multiplexing (WDM) signal source, multichannel dispersion compensator, and EDFA (Erbium-Doped Fiber Amplifier). It is widely applied to various WDM optical communication devices and systems such as planarizers. Conventional methods for fabricating such a sample grating include a method of irradiating an ultraviolet (Ultra-Violet) beam to an optical fiber waveguide using a phase mask and an amplitude mask simultaneously. In this case, the channel spacing between reflection peaks is produced. In addition to the disadvantages of using amplitude masks with different periods in order to adjust, the spacing between peaks is difficult to control because the reflection and transmission spectra are fixed after the sample grid is manufactured.

Therefore, the present invention is to change the transmission and reflection spectrum of the optical fiber grating by applying pressure (strain) or force periodically or non-periodically to the already manufactured optical fiber grating or a portion of the optical fiber grating has a multi-peak optical grating The present invention provides a sampled optical fiber grating filter and an optical fiber grating system using the same, which can be implemented in various optical communication devices and systems.

1A and 1B show a refractive index distribution formed in an existing optical fiber grating and reflection spectra by the optical fiber grating;

2 is a conceptual diagram illustrating the basic principle of implementing the sampled optical fiber grating filter of the present invention;

3A is a diagram illustrating a refractive index distribution changed by applying a periodic or aperiodic pressure (strain) or a force to an optical fiber grid having at least one or more different refractive indices, according to an embodiment of the present invention;

FIG. 3B is a diagram showing a reflection spectrum of a sampled optical fiber grating filter; FIG.

Figures 4a and 4b is a schematic configuration diagram of the basic equipment for causing a change in the reflection or transmission spectrum of the optical fiber grating by applying pressure (strain) or force periodically or non-periodically to the already manufactured optical fiber grating or a portion of the optical fiber grating And a cross section according to a-a ',

Figure 5a is a view showing various forms of the pressing irregularities formed on the pressing member of Figure 4,

5b to 5e are views showing various forms of the pressing member of FIG.

FIG. 6A is a diagram illustrating a refractive index distribution in a length direction of an optical fiber grating when no pressure (strain) or force is applied to the optical fiber grating or a portion of the optical fiber grating;

6b to 6d are diagrams showing a state in which the refractive index distribution in the longitudinal direction of the optical fiber lattice varies in accordance with the type of pressure (strain) or force applied to the optical fiber lattice or a part of the optical fiber lattice;

FIG. 7 is a schematic configuration diagram of a basic device capable of changing a pressure (strain) or a period of force by changing an axis of an optical waveguide including an optical fiber grating or an axis of a pressing member;

8 is a view for explaining the principle of changing the compression cycle of the optical fiber grating by the pressure (strain) or force of the pressing member to the optical fiber grating rotated at an arbitrary angle;

9A to 9C are graphs showing the change in the reflection spectrum of the sampled optical fiber grating according to the change in the compression period;

10A and 10B are perspective views and b-ss illustrating modifications of the pressing member that change the reflection or transmission spectrum of the optical fiber grating by applying pressure (strain) or force periodically or non-periodically to a portion of the optical fiber grating or the optical fiber grating; section according to b ',

11 is a view showing an application example of a multi-channel addition / extraction wavelength multiplexing system using a sampled optical fiber grating filter of the present invention;

12 is a view showing an application example of a multi-channel dispersion compensation system using a sampled optical fiber grating filter of the present invention,

13 is a view showing an application example of a multi-channel light source using the sampled optical fiber grating filter of the present invention,

14A and 14B show an application example of a multi-wavelength fiber laser system using the sampled fiber grating filter of the present invention;

15A and 15B show another sampled fiber grating in which a piezoelectric material is attached to a fiber grating or a portion of the fiber grating to apply periodic or non-periodic pressure (strain) or force to change the reflection and transmission spectrum of the fiber grating. A diagram showing an implementation example.

Explanation of symbols on the main parts of the drawings

10: optical fiber 20: optical fiber lattice

30: pressure member 40: support plate

50: rotating support plate 60: curved pressing member

70: piezoelectric material

IS, 100: input signal OS, 200, 206, 208, 210: output signal

RS, 300, 304: reflected signal 400: additional signal

F: Pressure (strain) or force applied to the fiber grating or part of the fiber grating

Sampled optical fiber grating filter for achieving the above object of the present invention, the optical fiber formed an optical fiber grid having an arbitrary refractive index; In order to change the refractive index of the optical fiber grating to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating, pressure unevenness is formed to press an arbitrary area of the optical fiber grating with an arbitrary angle in the advancing direction of the optical fiber waveguide. Pressing member; And a support plate for fixing and supporting the optical fiber. At this time, the optical fiber grating may have at least one or more different refractive index. In addition, the pressing irregularities formed on the pressing member may be formed periodically or aperiodically. Here, the pressing member is formed such that the upper surface and the bottom surface on which the pressure irregularities are formed are parallel to each other so that the pressure applied to the optical fiber grid is the same in the longitudinal direction of the optical fiber grid. In addition, the pressing member has a tapered or arbitrary function value at which the bottom surface with pressure unevenness corresponding to the upper surface is tapered so that the pressure applied to the optical fiber grating can be changed with an arbitrary function value in the longitudinal direction of the optical fiber grating. It may be formed round.

On the other hand, the pressing member is preferably formed to be rotatable in order to change the pressing period of the pressing irregularities. In addition, the support plate may be formed to be rotatable so as to change the advancing direction of the optical waveguide at an arbitrary angle.

In addition, the pressing member is preferably formed by forming a through hole through which the optical fiber penetrates and forming an uneven compression therein so that the pressing applied to the optical fiber grid can be applied in all directions about the traveling axis of the optical fiber waveguide. At this time, the pressing member is most preferably composed of two or more radially divided.

On the other hand, the present invention is an optical fiber formed an optical fiber grid having an arbitrary refractive index; In order to change the refractive index of the optical fiber grating to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating, pressure unevenness is formed to press an arbitrary area of the optical fiber grating with an arbitrary angle in the advancing direction of the optical fiber waveguide. Pressing member; And an optical fiber grating system using a sampled optical fiber grating filter including a support plate for fixing and supporting the optical fiber. The optical fiber grating system using the sampled optical fiber grating filter of the present invention comprises a multi-channel addition / extraction wavelength multiplexing system. In order to construct, the signals of specific wavelengths are reflected by the optical fiber grating filter sampled by the multi-wavelength optical signal incident to the input stage, extracted to the extraction stage, and the signals having the same wavelength as the extracted wavelengths are additional stages on the same principle as extraction. In addition, it is characterized in that it is output to the output and the signals of other wavelengths not affected by the sampled fiber grating filter.

In addition, in order to construct a multi-channel dispersion compensation optical system, the multi-wavelength optical signals incident on the input stage are scatter-compensated and reflected at different peaks by a chirped sampled fiber grating filter composed of several chirped fiber gratings. It is characterized by.

Further, in order to configure a multi-wavelength light source system, the optical fiber grating filter sampled at the output terminal of the semiconductor laser diode is positioned at an arbitrary point, and the peak of the multi-wavelength is output to the output terminal.

Meanwhile, to construct a multi-wavelength fiber laser system, Erbium Doped Fiber (EDF) is formed on the pumped laser source to form a resonant portion, and a wide band Bragg mirror or a sampled fiber grating filter at the input stage and a sample at the output stage are formed. The optical fiber grating filter forms a resonator so that the multi-wavelength laser peak is output to the output terminal.

The basic configuration of the present invention is largely composed of an already manufactured optical fiber grating and a pressing member capable of applying periodic or aperiodic pressure (strain) or force to the optical fiber grating or part of the optical fiber grating. The optical fiber grating to which pressure (strain) or force is applied can be used for various types of optical fiber gratings, such as a short period fiber grating, a long period fiber grating, and an inclined fiber grating, and pressure is applied to two or more identical or different fiber gratings. It may be. The applied pressure (strain) or the range, shape, and period of the force can be applied in various ways depending on the pressure member and the shape of the compression recesses attached to the pressure member. It is possible to change the refractive index distribution within and use it to change the transmission or reflection spectrum. The basic operation principle is that when the pressure is applied to the optical fiber waveguide, the refractive index of the portion where the pressure (strain) or the force is applied increases or decreases due to the photoelastic effect, which causes a change in the refractive index in the waveguide. When this phenomenon is applied to the optical fiber grating, the refractive index distribution in the optical fiber grating is changed by the applied pressure (strain) or force, which in turn causes a change in the transmission or reflection spectrum of the optical fiber grating.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1A and 1B are diagrams showing a refractive index distribution formed in an existing optical fiber grating and a reflection spectrum by the optical fiber grating. As shown in FIG. 1A, the optical fiber gratings n1 and n2 may be formed in the optical fiber 10, and the period Λ of the optical fiber grating may have an arbitrary value according to the type of the optical fiber grating. The slope of the grid ( ) May have any value including 0 depending on the type of fiber grating. As shown in Figure 1b, the reflection spectrum is represented by the optical fiber grating formed as described above. This is the case when no pressure (strain) or force is applied from the outside.

2 is a conceptual diagram illustrating the basic principle of implementing the sampled optical fiber grating filter of the present invention. Specifically, by applying pressure (strain) or force periodically or non-periodically to the optical fiber grating or a portion of the optical fiber grating already fabricated inside the optical fiber to change the transmission or reflection spectrum of the optical fiber grating and sampled using the optical fiber grating A diagram showing the basic principle of implementing the. The implementation principle induces a change in the refractive index distribution in the optical fiber grid 20 by applying a periodic or aperiodic pressure (strain) or a force (F) to the already prepared optical fiber grid 20 on the optical fiber 10 waveguide. By using this, the reflection signal (RS) and the output signal (OS) for the input signal (Input Signal: IS) of the optical fiber grating 20 are changed. The optical fiber grating 20 to which pressure or force F is applied may be used for various types of optical fiber gratings such as a short period, a long period, and an inclined fiber grating, and the reflection (RS) and the output signal ( The OS) can be varied in various ways depending on the pressure (strain) applied to the optical fiber grid 20 or the range (d1, d2), shape, and period (P) of the force (F).

3A is a diagram illustrating a refractive index distribution that is changed by applying periodic or aperiodic pressure (strain) or force to an optical fiber grid having n1 and n2 refractive indices as an embodiment of the present invention. The period P of the pressure (strain) or force F applied to the optical fiber grids n1 and n2 may be periodic or aperiodic. That is, the ratio of the region d1 to which the pressure (strain) or force F is applied and the region d2 to which it is not applied may be the same or may not be the same. The strength of the pressure (strain) or force F applied to the optical fiber grids n1 and n2 may be increased or decreased equally, linearly or nonlinearly in the longitudinal direction of the optical fiber grid. In the pressed portion d1, it can be seen that the refractive indices of the optical fiber grating are changed from n1 and n2 to n3 and n4.

FIG. 3B is a diagram illustrating a reflection spectrum of a sampled optical fiber grating when a sampled optical fiber grating is implemented by applying periodic or aperiodic pressure (strain) or force to an optical fiber grating already fabricated inside the optical fiber. Channel spacing between reflection peaks ( ) May be adjusted or changed by the pressure (strain) applied to the optical fiber grids (n1, n2) or the period (P) of the force (F).

Figures 4a and 4b is a schematic configuration diagram of the basic equipment for causing a change in the reflection or transmission spectrum of the optical fiber grating by applying pressure (strain) or force periodically or non-periodically to the already manufactured optical fiber grating or a portion of the optical fiber grating And sectional view along a-a '. Periodic or non-periodic pressure (strain) or force (F) is applied to the optical fiber grating 20 in the direction perpendicular to the axial direction of the waveguide of the optical fiber 10 including the optical fiber grating 20 or in any angular direction Sampled Fiber Grating Filters (SFGFs) are implemented by inducing a refractive index change of 20 and changing the reflected signal RS or output signal OS of the optical fiber grating 20. The sampled optical fiber grating filter SFGF is largely composed of the optical fiber grating 20 and the pressing member 30 capable of applying periodic or aperiodic pressure (strain) or force (F), and the optical fiber grating. It consists of the support plate 40 which supports the 20. The shape of the pressure (strain) or the force (F) applied to the optical fiber grid 20 may be implemented in various ways by the form of the pressing member 30 and the pressing concave-convex 31 attached to the pressing member 30.

5A is a view showing various forms of compression recesses and protrusions attached to the pressing member. It may have various shapes such as square, circle, triangle, trapezoidal, etc. according to the application purpose, the height (d3) of the pressure irregularities may have any value depending on the situation.

5B to 5E illustrate various forms of the pressing member for applying pressure (strain) or force to the optical fiber grid. FIG. 5B shows a periodic example in which the period P formed by the region d1 to which the pressure (strain) or force is applied and the region d2 to which the force is applied is not. Of course, the ratio of the region d1 to which pressure (strain) or force is applied and the region d2 not to be applied may or may not be the same. FIG. 5C shows an example of the pressing member 30-1 in which the pressure (strain) or periods of force P1, P2, ... Pn are aperiodic, and FIG. 5D shows the pressure (strain) or force of the applied force (strain) or force. An example of the pressing member 30-2 in which the intensity is increased or decreased is shown. 5E shows an example of the pressing member 30-3 in which the applied pressure (strain) or force intensity is applied to an arbitrary curve function.

FIG. 6A illustrates the refractive index distribution of an optical fiber grating in which no pressure (strain) or force is applied from the outside. ) Is an example that assumes a periodic fiber grating. Here, the refractive index distribution of the optical fiber grating may be slightly different depending on the type of optical grating to which pressure (strain) or force is applied.

6B to 6D are diagrams illustrating a state in which the refractive index distribution in the longitudinal direction of the optical fiber lattice is variously changed according to the type of pressure (strain) or force applied to the optical fiber lattice or a portion of the optical fiber lattice. 6B and 6C are diagrams illustrating a refractive index distribution when pressure (strain) or force is periodically applied to the optical fiber grid, and FIG. 6B is a region d1 and an area where no pressure (strain) or force is applied. (d2) is a figure which shows the same time, and FIG. 6C is a figure which shows the case where d1 and d2 are not the same. FIG. 6D illustrates a refractive index distribution in a sampled optical fiber grating filter when periodic pressure (strain) or force is applied to the optical fiber grating and the pressure (strain) or force intensity is gradually increased or decreased. , The amount of refractive index change caused by pressure (strain) or force ( ) Can have any function.

FIG. 7 is a schematic configuration diagram of a basic device capable of changing a pressure (strain) or a period of force by changing an axis of an optical waveguide including an optical fiber grating or an axis of a pressing member. In the apparatus of FIG. 4A by installing a rotary support plate 50 which can change the axial direction of the waveguide of the optical fiber 10 including the optical fiber grating 20 to which pressure (strain) or force F is applied at any angle. It is a structure that adds the function to change the pressure cycle (P). The rotary bearing plate 50 may be installed on the pressing member 30 to fix the axis of the optical waveguide 10 and to change the axis of the pressing member 30.

FIG. 8 illustrates an axial direction of an optical wave 10 waveguide or pressing member including an optical fiber grating 20 at an arbitrary angle ( Is a diagram showing the principle of changing the pressing period P by rotating in the following manner. The pressing period Pc after the rotation is expressed as in the following equation (1).

--------------------------- Formula (1)

9A to 9C are graphs showing the change of the reflection spectrum of the filter according to the pressure period P when the sampled optical fiber grating filter is implemented by applying a pressure (strain) or a force having a period P to the optical fiber grating. . Spacing between peaks of sampled fiber gratings ( ) Is expressed by the following equation (2).

--------------------------- Formula (2)

here, Is the center wavelength of the optical fiber grating when no pressure (strain) or force is applied, Is the effective refractive index of the sampled optical fiber grating, and P is the pressure period, respectively.

FIG. 9A shows the reflection spectrum of the sampled optical fiber grating when the pressure period P is not changed (Pc = P), and FIG. 9B shows when the pressure period P becomes large (Pc> P). 9c shows the reflection spectrum of the sampled optical fiber grating when the pressure period P becomes small (Pc < P).

10A and 10B show an embodiment of a sampled optical fiber grating filter (SFGF) of another structure in which the pressing member for applying pressure (strain) or force to the optical fiber grid is composed of two or more curved pressing members 60. 10A shows a perspective view and FIG. 10B shows a sectional view along b-b ', respectively. When applying a pressure (strain) or a force (F) to the optical fiber grid 20 with two or more curved pressing members 60, as shown in Figure 10a, all directions about the central axis of the optical fiber 10 waveguide cross section Since pressure (strain) or force (F) is applied, the polarization dependence on the input signal can be reduced. That is, the influence of linear birefringence can be eliminated.

FIG. 11 shows an example of configuring a multi-channel addition / extraction wavelength multiplexer using a sampled optical fiber grating filter. The multi-wavelength optical signal 100 incident to the input terminal is a signal of a specific wavelength by a sampled optical fiber grating filter (SFGF). , , , ) Is reflected and extracted 300 to the extraction stage, and signals of the same wavelength as the extracted wavelengths are additionally added 400 on the same principle as the extraction, so that they are not affected by the sampled fiber optic filter (SFGF). The output 200 is output to signals and output terminals of different wavelengths. Here, by changing the period of pressure applied to the optical fiber grid, signals of different wavelengths (eg , , , ) Can be added / extracted.

12 is an example of configuring a multi-wavelength dispersion compensation system using a chirp sampled fiber grating filter. When periodically applying pressure (strain) or strength to a fiber grating with increasing or decreasing strength or periodically applying pressure (strain) or force to a chirp fiber grating, several chirped fiber gratings with different center wavelengths The multi-wavelength optical signal 104 incident to the input terminal is distributedly compensated and reflected 304 at different center wavelengths of the chirped sampled fiber grating (SFGF).

FIG. 13 shows an example in which a multi-wavelength light source system is constructed by placing a sampled optical fiber grating filter at an arbitrary point at an output terminal of a semiconductor laser diode, and an oscillation mode of the laser and several reflection wavelengths generated by the sampled fiber grating filter (SFGF) The multi-wavelength peak is output 206 to the output stage in the wavelength band coinciding with.

14A and 14B illustrate an example of constructing a multi-wavelength fiber laser system using a sampled optical fiber grating filter. In FIG. 14A, an erbium-doped optical fiber is composed of a resonator and a broadband Bragg Mirror at an input and a sampled optical fiber at an output. The lattice filter is configured as a resonator to output 208 peaks of multiple wavelengths to an output stage. FIG. 14B illustrates a resonator using two sampled optical fiber grating filters, an input stage and an output stage. The peak of is output 210 to the output terminal.

15A and 15B illustrate another sampled fiber grating in which a piezoelectric material is attached to a fiber grating or a portion of the fiber grating to apply periodic or non-periodic pressure (strain) or force to change the reflection and transmission spectrum of the fiber grating. 15A illustrates an example in which an electric field unit applying an electric field to the piezoelectric material 70 applies the same control signal to each piezoelectric material 70, and FIG. 15B illustrates an electric field applied to the piezoelectric material 70. The electric field is composed of a plurality of examples to apply an independent control signal to each piezoelectric material (70). Here, although not shown in the drawings, it is well known that a fixed support member (not shown) having a function corresponding to the support plate for fixing and supporting the piezoelectric material is further added to apply pressure or force to the optical fiber.

As described above, the sampled optical fiber grating filter and the optical fiber grating system using the same according to the present invention, by applying pressure (strain) or force from the outside to the already manufactured optical fiber grating or a portion of the optical fiber grating periodically or aperiodically The method of implementing a sampled optical fiber grating filter having the characteristics of multiple peaks by changing the refractive index distribution in the optical fiber grating, and the optical communication device and the optical system using the same have been discussed. The present invention is expected to contribute greatly to the development of optical devices and optical systems, as well as optical fiber grating technology, by complementing the shortcomings of the existing sample gratings together with the implementation method of the new sample grating and suggesting an extension of the application range of the optical fiber grating.

The present invention is not limited to the above-described embodiment, and it will be apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

Claims (18)

An optical fiber forming an optical fiber grid having an arbitrary refractive index; In order to change the refractive index of the optical fiber grating to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating, pressure unevenness is formed to press an arbitrary area of the optical fiber grating with an arbitrary angle in the advancing direction of the optical fiber waveguide. Pressing member; And Support plate for fixing the optical fiber Sampled optical fiber grating filter, characterized in that consisting of. The sampled fiber grating filter of claim 1, wherein the fiber grating has at least one or more different refractive indices. The sampled optical fiber grating filter according to claim 1, wherein the pressing irregularities formed on the pressing member are formed periodically. The sampled optical fiber grating filter according to claim 1, wherein the pressing irregularities formed on the pressing member are formed aperiodically. The method of claim 3 or 4, wherein the pressing member, A sampled optical fiber grating filter, characterized in that the upper surface and the bottom surface on which the pressure irregularities are formed are formed in parallel so that the pressure applied to the optical fiber grating is equal in the longitudinal direction of the optical fiber grating. The method of claim 3 or 4, wherein the pressing member, The pressure applied to the optical fiber grating is formed by rounding the bottom surface with tapered or arbitrary function values corresponding to the upper surface so that the pressure applied to the optical fiber grating can be changed with an arbitrary function value in the longitudinal direction. Sampled fiber grating filter. The sampled optical fiber grating filter according to claim 1, wherein the pressing member is formed to be rotatable in order to change the pressing period of the pressing unevenness. The sampled optical fiber grating filter according to claim 1, wherein the support plate is formed to be rotatable so as to change an advancing direction of the optical waveguide at an arbitrary angle. The method of claim 1, wherein the pressing member is formed by forming a through hole through which the optical fiber penetrates and forming a compression recess in the inside thereof so that the pressing applied to the optical fiber grating can be applied in all directions about the traveling axis of the optical fiber waveguide. Sampled optical fiber grating filter, characterized in that. 10. The sampled optical fiber grating filter of claim 9, wherein the pressing member is divided into two or more radial portions. An optical fiber forming an optical fiber grid having an arbitrary refractive index; In order to change the refractive index of the optical fiber grating to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating, pressure unevenness is formed to press an arbitrary area of the optical fiber grating with an arbitrary angle in the advancing direction of the optical fiber waveguide. Pressing member; In the optical fiber grating system using a sampled optical fiber grating filter comprising a support plate for fixing and supporting the optical fiber, In order to construct a multi-channel addition / extraction wavelength multiplexing system, signals of specific wavelengths are reflected by an optical fiber grating filter in which a multi-wavelength optical signal incident at an input stage is sampled, extracted to an extraction stage, and a signal having the same wavelength as the extracted wavelength. The optical fiber grating system using the sampled optical fiber grating filter, characterized in that added to the additional stage on the same principle as the extraction, and output to the output stage and signals of different wavelengths unaffected by the sampled optical fiber grating filter. An optical fiber forming an optical fiber grid having an arbitrary refractive index; In order to change the refractive index of the optical fiber grating to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating, pressure unevenness is formed to press an arbitrary area of the optical fiber grating with an arbitrary angle in the advancing direction of the optical fiber waveguide. Pressing member; In the optical fiber grating system using a sampled optical fiber grating filter comprising a support plate for fixing and supporting the optical fiber, In order to construct a multi-channel dispersion compensation optical system, a multi-wavelength optical signal incident to an input stage is distributed and compensated at different peaks by a chirped sampled fiber grating filter composed of several chirped fiber gratings. An optical fiber grating system using a sampled optical fiber grating filter. An optical fiber forming an optical fiber grid having an arbitrary refractive index; In order to change the refractive index of the optical fiber grating to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating, pressure unevenness is formed to press an arbitrary area of the optical fiber grating with an arbitrary angle in the advancing direction of the optical fiber waveguide. Pressing member; In the optical fiber grating system using a sampled optical fiber grating filter comprising a support plate for fixing and supporting the optical fiber, In order to construct a multi-wavelength light source system, an optical fiber grating filter using a sampled optical fiber grating filter, wherein a peak of a multi-wavelength is output to an output end by placing a sampled optical fiber grating filter at an arbitrary point at an output end of a semiconductor laser diode. . An optical fiber forming an optical fiber grid having an arbitrary refractive index; In order to change the refractive index of the optical fiber grating to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating, pressure unevenness is formed to press an arbitrary area of the optical fiber grating with an arbitrary angle in the advancing direction of the optical fiber waveguide. Pressing member; In the optical fiber grating system using a sampled optical fiber grating filter comprising a support plate for fixing and supporting the optical fiber, In order to construct a multi-wavelength fiber laser system, an erbium-doped optical fiber forms a resonator for a pumped laser source, a broadband Bragg mirror at an input stage and a sampled optical fiber lattice filter at an output stage form a resonator such that a multiwavelength laser peak is output at the output stage. Optical fiber grating system using a sampled optical fiber grating filter, characterized in that the output. The method of claim 14, A sampled optical fiber grating system using a sampled optical fiber grating filter, characterized in that the sampled optical fiber grating filter having the same characteristics at the input terminal and the output terminal, respectively, to form a resonator. At least one piezoelectric material provided between the optical fiber waveguide and the support member to change the refractive index of the optical fiber grating in an optical fiber formed with an optical fiber grating having an arbitrary refractive index to generate multiple peaks in the reflection and transmission spectra of the optical fiber grating; And an electric field unit for applying an electric field to the piezoelectric material. 17. The optical fiber grating system of claim 16, wherein an electric field unit for applying an electric field to the piezoelectric material is connected in parallel to the electric field to apply the same control signal to each piezoelectric material. 17. The optical fiber grating system of claim 16, wherein the electric field unit for applying the electric field to the piezoelectric material has an independent electric field for each piezoelectric material to apply an independent control signal to each piezoelectric material. .