TW200533024A - Fiber laser apparatus - Google Patents

Abstract

A fiber laser apparatus comprises an erbium-doped fiber amplifier(EDFA), an optical circulator(OC), an optical switch(OSW), a plurality of reflecting waveguides, a coupler, a polarization controller, and a plurality of fiber wirings. The optical circulator(OC) is used to limit and decide the transmitting direction of the light emitted by the erbium-doped fiber amplifier(EDFA). The optical switch(OSW) is used to switch the wavelength of light entering the optical switch(OSW). The reflecting waveguides is used to reflect a fixed single wavelength from the signal transmitted by the optical switch(OSW) and pass other wavelengths. The coupler is used to form a laser resonating cavity to laser a laser. The polarization controller is used to control the polarization direction of light. The fiber wirings are used to connect the above mentioned components to form principally laser resonating cavity.

Description

200533024

The technical field to which the invention belongs: Off, especially a reflection in an optical transmission wheel to control the light output wavelength. The present invention and a fiber laser device have a wavelength-tunable fiber laser device using a light circulator and a wavelength-tunable fiber grating. . Previous technology: The development of optical fiber communication technology has affected human social integration, education, and economics, and it has a huge level; Second, the quality of high-efficiency and low-maintenance service has become a 踗: valley 1, improve The best weapon for the unjust network. In addition to a complete optical fiber transmission system, in addition to transmitting detectors and optical fiber cables, various types of optical fiber optics, optical fiber connectors, optical fiber couplers, optical multiplexers, and optical attenuation devices must be equipped. , Such as off (Optical Switch), optical isolator and so on. In recent years, a kind of all-optical network (A 1 1 〇ptica 1 networks) with high capacity, high reliability and flexible expansion of Dense wavelength division multi-piexi (DWDM). The system has received extensive attention and research. The structure of the above all-optical network is divided into an optical transmission layer and a transport layer and a service layer. Among them, whether the optical layer can effectively use optical fiber resources is an important issue for network operators. Pass

Page 9 200533024 V. Description of the invention (2) In addition, the optical signal switch (Optical Switch) is an important element responsible for managing data flow control, and it is also one of the important elements that determine whether resources are effectively used. On the other hand, when the transmission wavelength of an all-optical network becomes more and more, the flexibility of channel scheduling and routing change 'must also be accomplished by an optical switch. '' Therefore, optical switches are usually placed at important tandem points on the network. Different wavelength signals can be received at their input ends, and they can be assigned to any output end via the optical signal switcher for information reorganization and organization. Effectively expand the scale and management flexibility of the fiber optic network. However, in the conventional optical fiber laser device, the output of the optical signal is a fixed wavelength. For flexible wavelength changes, the present invention provides a tunable-wavelength optical fiber laser device instead of a fixed-wavelength optical fiber laser device. Summary of the Invention: Based on the above discussion, the purpose of the present invention is to control and adjust the output light wavelength by using the reflections of an optical circuiator, an optical switch, and a tunable fiber Bragg grating (TFBG). Purpose. Another object of the present invention is to provide an optical fiber laser device.

Page 10 200533024 V. Description of the invention (3) The light | amplifier of the present invention; an optical loop erbium-doped fiber amplifier; the above optical switch can reflect the optical waveguide, and the optical signal is reflected by the reflected optical waveguide laser resonant cavity to | The polarization controller is a fiber jumper wiring. The laser resonance cavity fiber laser device required by the light, its ring set, and the light excited by the light circulation module are switched into the light and the reflected light waveguide is fixed. A single light wave; an optical coupling and derivation is used to control the optical fiber jumper connector, the polarization of the above-mentioned lightning is used to connect the component device and the transmission side converter is allowed to be long, and the optical coupling emits light; The directions include the following: one to limit and direct the wavelength of the light; the remaining optical wave combiner that can switch the light can be controlled by polarization and an erbium-doped fiber of each element to determine the switch, and the lengths passed by a plurality of devices pass through It is used to form a control device, and a plurality of light beams are formed to form the source of the main source. A distributed pump 1 is used to make the above | pump laser source transmitter into the fiber grating. | Long-tunable bright fiber laser device, its wave multiplexer, the above-mentioned demultiplexing light and signal light pass; the pumping of a section of demultiplexing multiplexer can be used to pump the erbium-doped light to reflect the wavelength of light; The light wavelength of the optical switch; a fixed single-wavelength Bragg fiber grating is radiated with the above-mentioned wavelength-tunable optical fiber. The components include: the pump can be doped with an inclined fiber, and the light is converted into a signal fiber; a light reflector converter 'the above-mentioned light cut and' a plurality of gratings can make the light cut 'the rest of the spectrum is uniformly pumped laser Erbium-doped fiber excited by a laser source may be used; wherein, the above-mentioned optical inverter can be cut by a length-adjustable optical converter and passed through the above-mentioned optical fiber laser device of the present invention. Its constituent elements include a pump laser. Page 11 200533024 V. Description of the invention (4) Isolator coupler laser and split-wave multi-source circulating source; a light wavelength selection | excitation pump can make this device, the above-mentioned selective coupler transmits I element, and the reflected j signal reflects a solid The light waveguide component wiring is used to connect the above-mentioned optical isolation. The above-mentioned wavelength signal light comes in through the device to limit a single optical coupler, and pass a single light defined by different waveguide waveguides; and, each of the above The ion coupler is used to isolate the reflected light signal. One choice of the multiplexer can make the pump source i, a section of bait-doped fiber, the above-mentioned erbium-doped fiber pump laser and signal. Gain; a ring of light that determines the light excited by the pump laser source; the above-mentioned optical coupler can distribute the light with a long wavelength of X; a plurality of reflected light waveguides can allow the light transmitted by the optical switch Wavelength, the rest of the optical wavelengths are passed through the inversion of several optical fiber jumpers, and the above optical fiber jumpers form the main laser resonant cavity. Implementation method: I adopt the technique: the commissioner can further understand the intended purpose of the present invention | Related illustration details :: According to the preferred embodiment of the present invention, and cooperated with a thin (tpfiLT-provided light wavelength continuous change element) It uses the light cycle meter agS β = rCUlat〇r), the optical switcher and the reflection of the fiber grating (fiber meter lng: FBG) to achieve the purpose of controlling the output wavelength. I sound map. 1: It is an optical fiber laser device according to an embodiment of the present invention, and the medium-inclined doped fiber amplifier (EDFA) m includes:-Lithium laser source, page 12, 200533024 V. Description of the invention (5) 101, one point Wave multiplexer (WDM) 102, a section of doped fiber (EDF) 103, optical isolator (ISO) 104 and 105. First, the pump laser source 101 excites and emits an optical signal and enters the above-mentioned demultiplexing multiplexer 102, and then passes through the obliquely-doped optical fiber 103 to make the pump laser and signal light excited by the pump laser source 101. : Passed. The above-mentioned obliquely-doped optical fiber 103 can pump the laser and signal light gains through which the above-mentioned demultiplexing multiplexer 102 passes. Then, it passes through the optical isolator 104 and enters the optical circulator 106. The above-mentioned optical isolator 104 is used to isolate signals of reflected light. After that, the optical signals from port 1 to port 2 of the optical circulator 106 enter an optical switch 1 1 1. The optical switch 1 1 1 can switch the wavelength of the light entering the optical switch. Therefore, the optical signal passing through the optical switch 1 11 can choose to enter the reflected light waveguide 1 1 2 or the reflected light waveguide 1 1 3. In one embodiment, the optical switch 1 1 1 is a 1 × N optical switch. The 1 × χ (N optical switch is used to match several reflective optical waveguide devices to cover a wider frequency bandwidth. The reflected light waveguides 112 and 113 are a wavelength-tunable fiber optic light bulb. The reflected light waveguides 112 and 11 3 can reflect a fixed single light wavelength in the optical signal transmitted by the optical switch 1 1 1, and the rest The light spectrum passes through the reflected light waveguide.

Then, the optical signal t through the reflected light waveguide Π 2 or the reflected light waveguide i 丨 3 passes through the optical switch 11 1 and enters the port 2 of the above-mentioned optical circulator 106. The above light can be replaced by 1 1 1 which can be a liquid crystal type, a mechanical type, a micro-electromechanical type, or a knife changer. After that, the optical signals from port 2 to port 3 of the optical circulator 10 enter a

200533024

The optical coupler 107 and a polarization controller 108. The above-mentioned optical coupler ι07 can be used to form a laser resonant cavity. The polarization controller 108 described above uses a polarization direction. For example, the above-mentioned light coupler 107 is a coupling device, and the laser resonant cavity formed by the Rong 2X 2 optical coupler is to reduce the line width of the excited laser light. Then, the optical signal is output to a photodetector (0SA) 11〇 'through another optical coupler J 〇9 or to another optical isolator to complete a cycle. For example, the above-mentioned optical coupler 10 is a ratio type optical coupler, and its output ratio may be 99% (%). The above-mentioned optical coupler 109 may be used to derive the formed laser light. The laser light of the invention can cover a frequency band of wavelengths from 1530 to 1610 nm. The wavelength-tunable optical fiber laser of the present invention also includes a plurality of optical fiber jumpers (not shown). The wiring system is used to connect the above components and form the main laser cavity.

Jiu-Ming > See Figure 1 'This is a diagram of an optical fiber laser according to another embodiment of the present invention. First, a pump laser source 200 excites an optical signal and enters the above-mentioned demultiplexer 201'. The above-mentioned pump The wavelength of the light excited by the laser source 2000 at a wavelength of 148 nanometers (nm) can reduce the optical transmission loss in a single-mode fiber and improve its efficiency. Then, on the one hand, the optical signal passes a bait-doped optical fiber 2 0 2 ′, so that the pump laser and the signal light excited by the pump laser source 2⑽ generate a gain. And then through a light reflector 2 0 3 to reflect the light signal

Page 14 200533024 V. Description of the invention (7), after that, it enters an optical switcher 204 through the obliquely-doped optical fiber 202 and the demultiplexer 2001. After the above optical signal enters the above-mentioned demultiplexing multiplexer 2 0, it can also directly enter the optical switch 2 0 4. The optical switch 204 may be a liquid crystal type, a mechanical type, a micro-electro-mechanical type, or an integrated optical type switch. The above-mentioned light reflector 203 may also be replaced by a light circulator. The above-mentioned optical switcher 204 can switch the wavelength of the light entering the optical switcher. Therefore, the optical signal passing through the optical switcher 204 can choose to enter a tunable Bragg fiber optic peach 5, tunable Bragg fiber grating 2 〇6, adjustable Bragg f fiber grating 207 or adjustable Bragg fiber grating 208. For example, the above-mentioned optical switch 204 is a 1 乂 N optical switch, and the κ N optical switch is for use with the above-mentioned wavelength-tunable fiber gratings 205, 206, 207, 208 to achieve a wider bandwidth. The above-mentioned wavelength-tunable optical fiber gratings 205, 206, 207, and 20 8 can reflect a fixed single optical wavelength in the optical signal transmitted by the above-mentioned optical switch 204. The remaining optical wavelengths are passed through the above-mentioned wavelength-tunable optical fiber. Raster. Then, the optical signal passing through the reflected light waveguide 205, 206, 207, or 208 passes through the optical switch and then enters the optical switch 204 to be output. The laser light of the present invention may cover a frequency band of a wavelength of 1530 to 1610 nanometers (nm). The wavelength-tunable optical fiber laser of the present invention also includes a plurality of optical fiber jumpers (not shown). The optical fiber jumper is used to connect the above components and

Page 15 200533024 V. Description of the invention (8) — forming the main laser resonance cavity. Please refer to FIG. 3, which is a schematic diagram of an optical fiber laser device according to another embodiment of the present invention. First, a pump laser source 300 excites an optical signal and enters an optical isolator 301. The optical isolator 301 is used to guide the optical signal for one-way transmission. The wavelength of the light excited by the above pump laser source 300 is 1 480 nanometers (n in). The light of this wavelength can reduce the optical transmission loss in the single-mode fiber and improve its efficiency. Then, the above-mentioned optical signal enters a wavelength selective coupler (WSC) 302, and then, on the one hand, passes through a single-mode optical fiber (SMF) 304 to allow the pump laser and signal light excited by the pump laser source 300 above to pass. Then, through a section of erbium-doped fiber 3 0 6, the pumping and signal light passing through the wavelength selective coupler 3 2 2 can generate gain. Then, it passes through a single-mode fiber (smf) 3 05 and enters the optical circulator 3 07. Then, the optical signals pass through port 2 to port 3, port 3 to port 1 of the optical circulator 3 07, and then pass from port 1 to port 2 of the optical circulator 3 7 through a single-mode fiber (SMF) 3 0 5 and passed through the bait-doped fiber 3 0 6. Then, the optical signal passes through the single-mode optical fiber (SMF) 3 04 and returns to the wavelength selective coupler 3 2. Of

After that, the optical signal enters an optical coupler 308. The above-mentioned optical coupler 3 08 can distribute light of different wavelengths transmitted by the above-mentioned wavelength selective coupler 3 02. Therefore, the optical signal passing through the optical coupler 30 8 can selectively enter the reflection optical waveguide 309, the reflection optical waveguide 310, and the reflection. Optical waveguide 311 or reflected optical waveguide 312. As an example, the above-mentioned reflected light waveguides 309, 310, 311, and 31 2 are a wavelength-tunable fiber grating.

Page 16 200533024 V. Description of the invention (9) The above-mentioned reflected optical waveguides 309, 310, 311, and 31 2 can reflect a fixed single optical wavelength in the optical signal transmitted by the optical coupler 308, and the rest of the optical wavelengths are all Pass the reflected light waveguide. Then, the light signal passing through the reflected light waveguide can be output to a spectrometer (0SA) 3 1 3 for detection. In addition, the reflected light signal can enter the above-mentioned reflected light waveguides 309, 310, 3 1 1, 3 1 2 and continue another cycle. The wavelength-tunable optical fiber laser of the present invention also includes a plurality of optical fiber jumpers (not shown). The optical fiber jumper is used to connect the above components and form a main laser resonance cavity. Please refer to FIG. 4A, which is a schematic view of a supporting body of the wavelength tunable fiber grating of the present invention. The carrier body 400 includes a movable platform 400, and the movable platform 404 can push the adjustable ^ fiber = peach 4001 placed on the carrier body 400 to achieve the purpose of changing the reflected light wavelength. . The mobile platform 404 includes: an optical carrier 402, a precision translation stage 403, a movable baffle 405, and a fixed baffle plate 406. The optical carrier 402 is used to carry the above Fixed baffle 40 6 and precision translation stage 403. The above-mentioned precision translation 40 load and the above-mentioned movable baffle plate 405; in addition, the above-mentioned movable measure plate 40 and / or solid bearing are matched with a precision translation stage 4 ° 3 to push and carry the adjustable fiber optic grating 4 0 1 Purpose. η f 轼 In addition, the above precision translation stage 4 03 and fixed seeding plate 4 06 can be used.

V. Description of the invention (10) The wire is fixed to the above-mentioned optics. The movable baffle plate 405 can also be a bendable precision mobile station 403. The carrier body 400 4 0 1 is fixed to the carrier material ′, which can use the above-mentioned wavelength-tunable optical fiber gratings. Furthermore, according to the needs of the frequency band, Bao. The adjustable fiber grating 4 0 1 is described to achieve a wider frequency.

^, The mobile platform 404 moves to push the above-mentioned adjustable optical fiber grating 401. The adjustable optical fiber grating 401 has two bending modes, that is, it bends toward 2 2 1 1. When the above-mentioned tunable optical fiber grating 4 〇1 bends upward, the 7 11 long system moves toward the short wavelength range, please refer to the fourth β diagram; when J: the fiber grating 401 bends downward, its reflection wavelength is long Refer to Figure 4C for the violation of the wavelength. That is to say, the above-mentioned wavelength-tunable fiber grating 401 is subject to two different bending strains, and the basin can increase the adjustable range of the test length. The present invention has been described above with reference to the preferred embodiments, but it is not intended to limit the scope of patent rights of the current day f ^. #The scope of patent protection shall be determined by the attached patent application, offense and its equivalent. Anyone who is familiar with the art in this field, without departing from the spirit or scope of this patent, changes or retouches are equivalent changes or designs made under the spirit disclosed in this document, and should be included in the following Within the scope of patent application.

Page 18 200533024 Schematic illustrations Simple illustrations: The preferred embodiment of the present invention will be described in more detail in the following explanatory text with the following figures: Figure 1 shows the optical fiber laser showing the present invention Schematic of the device. Fig. 2 is a schematic diagram showing an optical fiber laser device according to another embodiment of the present invention. Fig. 3 is a schematic diagram showing an optical fiber laser device according to another embodiment of the present invention. Fig. 4A is a diagram showing the wavelength of the present invention. Schematic diagram of the main body of the modulated fiber grating. Fig. 4B is a schematic diagram showing the strain of the wavelength tunable fiber grating of the present invention. Fig. 4C is a schematic diagram showing the strain of the wavelength tunable fiber grating of the present invention. Graphical symbol comparison table: _ Erbium-doped fiber amplifier (EDFA) 100 pump laser source 1 0 1, 2, 0 0, 3 0 0 demultiplexer (WDM) 102, 201 Erbium-doped fiber (EDF) 103, 2 0 2 , 306 Optical Isolator (ISO) 104, 105, 301

Page 19 200533024 Schematic description of the optical circulator 1 0 6, 3 0 7 light coupler 1 0 7 polarization controller 1 0 8 optical coupler 109, 308 spectrometer (0SA) 110, 313 optical switch 11 1 , 2 0 4 wavelength tunable fiber gratings 112, 113, 205, 206, 207 208 > 309 > 310 > 31 312 light reflector 2 0 3 m wavelength selective coupler (WSC) 302 single mode fiber (SMF) 3 04 305 Bearing body 400 Wavelength tunable fiber grating 4 0 1 Optical carrier 402 Precision translation stage 4 0 3 Mobile platform 4 0 4 Mobile broadcast board 4 0 5 Fixed baffle 4 0 6 _

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Claims (1)

200533024 VI. Scope of patent application Patent scope: 1. An optical fiber laser device, comprising: a steel fiber amplifier; an optical circulator, which is used to limit and determine the light excited by the erbium-doped fiber amplifier Transmission direction; an optical switch, which can switch the wavelength of light entering the optical switch; a plurality of reflected light waveguide elements, which can reflect the light signals transmitted by the optical switch A fixed single light wavelength, and the rest of the spectrum passes through the reflected light waveguide element; an optical coupler, which can be used to form a laser resonant cavity and derive the formed laser light, which can be transmitted through A spectrometer is used for detection; a polarization controller is used to control the polarization direction of the light; and a plurality of optical fiber jumpers are used to connect the above components and form the main Laser resonant cavity. 2. The optical fiber laser device according to item 1 of the scope of patent application, wherein the laser light can cover a frequency band of wavelengths from 1530 to 1610 nanometers (nm). 3. The optical fiber laser device according to item 1 of the patent application scope, wherein the optical switch is an IX N optical switch, and the IX N optical switch is for matching the plurality of reflective optical waveguide elements to achieve a wider coverage. bandwidth. Page 22 4 200533024 6. Scope of patent application 4. For the optical fiber laser device of the scope of patent application item 3, the optical switch can be a liquid crystal type, mechanical type, micro-electro-mechanical type or integrated optical type switcher. 5. The optical fiber laser device according to item 1 of the patent application scope, wherein the reflected light waveguide element is a wavelength-tunable optical fiber element. 6. The optical fiber laser device according to item 5 of the patent application scope, wherein the wavelength-adjustable optical fiber component is a wavelength-tunable optical fiber grating. 7. The optical fiber laser device according to item 1 of the scope of patent application, further comprising a 'bearing body for carrying the wavelength-tunable fiber grating. 8. The optical fiber laser device according to item 7 of the patent application scope, wherein the carrier body includes a movable platform, and the wavelength-adjustable fiber grating placed on the carrier body can be pushed by the mobile platform to achieve a change For the purpose of reflecting the wavelength of light, the mobile platform includes: an optical carrier, a precision translation stage, a movable baffle and a fixed baffle, wherein the optical carrier is used to carry the fixed baffle and precision translation stage; The precision translation stage is used to carry and move the movable baffle plate; the movable baffle is used with the fixed crotch plate at the same time, and can be matched with the precision translation stage to push and carry the wavelength-tunable optical fiber grating 0, Page 23, 200533024 VI. Application scope of patents · 9. For the optical fiber laser device of the first scope of application for patents, the optical coupler is a 2X 2 optical coupler, and the laser times formed by the 2X 2 optical coupler The purpose of the resonant cavity is to reduce the line width of the laser light to be excited. 10. The optical fiber laser device according to item 1 of the scope of the patent application, wherein the optical coupler is a ratio type optical coupler, and the output ratio thereof may be 1 to 9 9 percent (%) 〇1 1. An optical fiber laser The device includes: a pump laser source; a demultiplexing multiplexer that allows the pump laser and signal light excited by the pump laser source to pass through; a section of erbium-doped fiber that allows the demultiplexing The pump laser and signal light passed by the tool generate gains; the pump laser source can be used to pump the erbium-doped fiber; a light reflector, which is used to reflect the wavelength of light; an optical switch, The optical switch can switch the wavelength of light entering and leaving the optical switch; and a plurality of wavelength-tunable optical fiber gratings, the wavelength-tunable optical fiber can allow a fixed single light to be reflected in the optical signal transmitted by the optical switch Wavelength, the rest of the light wavelengths are passed through the wavelength-tunable fiber optic peach. 1 2. If the optical fiber laser device according to item 11 of the scope of patent application, wherein the wavelength of the light excited by the pump laser source is 1 480 nanometers (nm), the light of this wavelength may be m 11 »Page 24 200533024 6. The scope of patent application reduces the optical transmission loss. Among them, the installed laser beam should be installed, and Fan Li specially asked IX to apply for the number of copies. Widening the frequency is to replace the cover to cut the light from the wide device to the X 叇 item 1 Γ 丄 TX of N, and the grating light to change the fiber to cut the light type N tone for the long wave. The optical fiber laser device of item 13, wherein the optical switch may be a liquid crystal type, a mechanical type, a micro-electro-mechanical type, or an integrated optical type switch. 15 · If the optical fiber laser device according to item 11 of the patent application scope, the optical reflector can also be replaced by an optical circulator. 16 · The optical fiber laser device according to item 11 of the scope of patent application, further comprising a supporting body for supporting the wavelength tunable fiber grating. 17 · If the fiber laser device according to item 16 of the patent application scope, wherein the carrier body includes a movable platform, the wavelength-adjustable fiber grating placed on the carrier body can be pushed by the mobile platform to To achieve the purpose of changing the wavelength of the reflected light, the mobile platform includes: an optical carrier, a precision translation stage, a movable baffle and a fixed baffle, wherein the optical carrier is used to carry the fixed baffle and the precision translation stage And the precision translation stage is used to carry and move the movable baffle; the movable baffle is used with the fixed retaining plate at the same time, and can be matched with the precision translation stage to push and carry the wavelength-tunable optical fiber Page 25 i 200533024 VI. Patent application scope Grating. 1 8. A fiber laser device comprising: a pump laser source; an optical isolator, the optical isolator is a wavelength-selective I coupler, the pump laser excited by the wavelength light source and the signal light pass doped with bait Optical fiber, the pump laser that permeates the optical fiber and the signal light to generate gain-an optical circulator, the optical circulator is the transmission direction of the light excited by the source; an optical coupler, the optical coupler can transmit the difference Light of wavelength; a plurality of reflected light waveguide elements can allow the light to be used for selective coupling; can allow the demultiplexer to pass off-reflected light signals; the combiner can allow the pumping to limit and determine the pump laser The coupler optical waveguide element is selected according to the wavelength distributed by the reflection converter. The single optical wavelength in the transmitted optical signal is reversed, and the rest of the spectrum is detected by the reflective optical waveguide and spectrometer. The optical signal can be transmitted through a plurality of optical fiber jumpers, and each element of the light forms a main laser resonance fiber jumper to connect the cavity. 19. The fiber laser device of claim 18, wherein the wavelength of the light excited by the pumping light source is 1480 nanometers (nm), and the light of this wavelength can reduce the optical transmission loss. Page 26 200533024 VI. Application scope of patent 20. The optical fiber laser device according to item 18 of the patent application scope, wherein the reflected optical waveguide element is an adjustable optical fiber element. 2 1. The optical fiber laser device according to item 20 of the patent application scope, wherein the tunable optical fiber element is a wavelength tunable optical fiber light sugar. 22. The fiber laser device according to item 18 of the patent application scope further includes a supporting body for supporting the adjustable fiber grating. 2 3. The optical fiber 'laser device according to item 22 of the application, wherein the carrier body includes a movable platform, and the adjustable optical fiber grating placed on the carrier body can be pushed by the mobile platform. To achieve the purpose of changing the reflected light wavelength, the mobile platform includes: an optical carrier, a precision translation stage, a movable baffle and a fixed baffle, wherein the optical carrier is used to carry the fixed baffle and precision translation The movable translation plate is used to carry and move the movable baffle plate; the movable baffle is used with the fixed retaining plate at the same time, and can be matched with the precise translation table to push and carry the adjustable fiber grating Page 27