TWI238581B - 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 lase 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

1238581 V. Description of the invention (1) The technical field to which the invention belongs: The present invention relates to a fiber laser device, in particular to a light transmission device that controls the wavelength of the light output wavelength through the reflection of a light circulator and a wavelength-tunable fiber grating Adjustable fiber laser device. Previous technology: The development of optical fiber communication technology has affected the human life, culture, education, economy and other aspects. It has a huge information capacity, improved high-efficiency, low-maintenance service quality, and has become the most popular of broadband networks. Good weapon. In addition to a complete optical fiber transmission system, in addition to the emission light source, photodetector, and optical fiber and cable, various types of optical fiber optical path components must also be equipped, such as optical fiber connectors, optical fiber handles, optical multiplexers, and optical Attenuators, Optical Switches, Optical Isolators, and more. In recent years, an all-optical networks (Dense wavelength division multiplexing (DWDM)) system with high capacity, good reliability, and flexible expansion has received extensive attention and research. The structure of the above all-optical network is divided into an optical transmission layer and a service layer, and whether the optical transmission layer can effectively use optical fiber information

Source is an important issue for operators of fine X 'roads. The optical switch outside the material stream 1 is an important element responsible for managing the control of the element I, and it is also one of the important factors for determining whether the resource is effectively used. On the other hand, when the transmission wavelength of an all-optical network becomes more and more, the flexible scheduling and routing change of the slope must also be implemented by an optical switch.

Therefore, the optical switch is usually placed at an important junction point on the network. At its input end, signals of different wavelengths can be received, and they are referred to as an output end through the optical signal switch to reorganize and organize information and effectively expand it. The scale and management flexibility of optical fiber, and roads. ^ However, in traditional fiber laser devices, the output of the optical signal is a fixed wavelength. For flexible wavelength changes, the present invention provides an adjustable-wavelength type optical fiber laser device instead of a fixed-wavelength type optical fiber laser device. Summary of the invention:

Based on the above discussion, the purpose of the present invention is to use the reflection of an optical circulator, an optical switch, and a tunable fiber Bragg grating (TFBG) to achieve the purpose of controlling and adjusting the output light wavelength.

Page 10 1238581 V. Description of the invention (3) Another object of the present invention is to provide an optical fiber laser device. The optical fiber laser device of the present invention includes the following components: _ # & ^ fiber amplifier; an optical circulator, which is used to limit the fine μ 1 ^ system and determine the excitation by the erbium-doped fiber amplifier module The transmission direction of the light ·, ν, an optical switch, the optical switch can switch into the optical switch before, the leather hand · a plurality of reflected light waveguides, the reflected light waveguide can read the light switch A fixed single light wave is reflected in the transmitted light signal, and the rest of the light wavelengths pass through the reflected light waveguide; an optical coupler, j, +, and, and a light coupler can be used to form a laser resonance Cavity and lead-out / a polarization controller, the polarization controller is used to control the polarization direction of light; and a plurality of optical fiber jumpers, which are connected to the above components and form a main Laser cavity. '' The optical fiber laser device of the present invention includes the following components: ~

The optical reflector is used to reflect the wavelength of light; an optical switch, the optical switch can switch the wavelength of light entering the optical switch; and a plurality of wavelength-tunable fiber gratings, The spectrum transmitted by the optical switch reflects a fixed single light wavelength and the remaining sources; a demultiplexer, which can pass the pumped laser and signal light excited by the pump light source; a section of erbium-doped fiber The above option = optical fiber can convert the pump laser passed by the above-mentioned demultiplexer into a signal ^; wherein the above pump laser source can be used to pump the doped optical fiber; a light reflector,

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1238581 V. Description of the invention (4) The spectra all passed the above-mentioned wavelength-tunable Bragg fiber grating. A source-pumped optical fiber-optical tracking device includes the following components: a pump laser optical isolator for isolating the reflected light signal; the above-mentioned wavelength selective coupler allows the pump laser δίΐ light to pass through; < Inclined fiber, gain of pump laser and signal light from the above-mentioned multiplexer; circulator is used to limit and determine the direction of the pump laser source; an optical coupler, the above-mentioned optical coupler can combine light of different wavelengths transmitted by the combiner A plurality of the above-mentioned reflected light waveguide elements can make the light number reflect a fixed single light wavelength, and the remaining light waveguide elements; and a plurality of optical jumper cables are used to connect the above-mentioned components and implement the method: To enable the Pei review committee to further advance the techniques and methods adopted by the Meizi Brigade, we will cooperate with the related diagrams according to the intended purpose of this book, as described in detail below. A preferred embodiment, and the optical wavelength continuous circulator provided by the present invention, and also the optical circulator, are achieved by using the light advance switch and the reflection of fiber Bragg grating 1235881 (fiber Bragg grating: FBG) to achieve The purpose of controlling the round-out wavelength. /-Please refer to FIG. 1, which is a schematic diagram of an optical fiber laser device according to an embodiment of the present invention. The EDFA 100 includes: a pumped, original 101, a wavelength division multiplexer (WDM) 1 0, a section of doped optical fiber (edF teaching 103, optical isolator ( ISO) 104 and 105. First, the pump laser source ιοί emits a light signal and enters the above-mentioned demultiplexing multiplexer 102, and then pushes the optical fiber 103 through ^, so that the above-mentioned pump laser source 10 Excited pump laser A passes through the light. The erbium-doped fiber 1 〇3 can make the pump laser and signal light gain of the demultiplexer multiplexer pass. Then, it passes through the optical isolator 1 〇4 and enters the optical circulator 1 〇6. The above-mentioned optical isolator 1 04 is used to isolate the signal of reflected light. After cutting, the optical signal from port 1 to port 2 of the optical circulator 1 06 enters an optical converter 1 1 1. The above optical The switch 1 1 1 can switch into the inverse wavelength of the optical switch, so the light signal passing through the optical switch 111 can choose to enter the upward light waveguide 112 or the reflected light waveguide 113. For example, as The light switch 1 1 1 is an IX N light switch. The IX N light switch is equipped with several reflected lights. The waveguide device is designed to cover a wider bandwidth. The reflected light waveguides 11 2 and 11 3 are wavelength-adjustable fiber gratings. The reflected light waveguides 112 and 11 3 allow the light switch ill to transmit light. The signal reflects a fixed single light wavelength and the rest of the spectrum

Page 13 1238581 V. Description of the invention (6) All pass through the reflected light waveguide. Then, the light signal passing through the reflected light waveguide 1 12 or the reflected light waveguide π 3 passes through the optical switch 111 and enters the port 2 of the optical cycler 106 described above. The optical switch 1 1 1 may be a liquid crystal type, a mechanical type, a micro-electro-mechanical type, or an integrated optical type switch. After that, the optical signals from port 2 to port 3 of the optical circulator 106 enter an optical coupler 107 and a polarization controller ι08. The above-mentioned optical coupler 107 can be used to form a laser resonant cavity. The polarization controller 108 is used to control the polarization direction of light. For example, the above-mentioned optical coupler 107 is a 2X 2 optical coupler. The laser resonance cavity formed by the 2X 2 optical coupler is to reduce the line width of the laser light to be excited. Mai then ’uses another optical coupler 1 09 to output the optical signal to an optical detector (OSA) 110, or enters another optical isolator 105 to make a cycle of 7G. For an embodiment, the above-mentioned optical coupler is a ratio type optical coupler, and the output ratio thereof can be 丨 ~ 99% (%). The above-mentioned optical coupler 10 9 can be used to derive the formed laser light. . The laser light of the present invention may cover a band with 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 jumpers are used to connect the above components and form a main laser resonant cavity. 70

1238581 V. Description of the invention " " For the explanation, please refer to FIG. 2 'which is another embodiment of the optical fiber laser of the present invention. First, the pump laser source 2000 excites a light signal and enters the ^ multiplexer 201. The wavelength of the light excited by the pump laser source 2 00 is 148〇1 =, (nm), and the light of this wavelength can be Reducing optical transmission in single-mode fiber and improving its efficiency. Then, on the one hand, the above-mentioned optical signal passes through the 4th series optical fiber 2 0 2 ′, so that the laser light and the ^ ^ action excited by the above-mentioned pump laser source 2 0 generate gain. Then, the upper reflector is reflected by a light reflector 203, and then, it enters an optical switcher 204 through an erbium-doped fiber 202 and a demultiplexer. After the above optical signal enters the above-mentioned demultiplexing ^ p 0 1, it can also directly enter the optical switch 204. The above-mentioned optical switch 2 0 4 M is a liquid crystal type, a mechanical type, a micro-electro-mechanical type, or an integrated optical type switch. The light reflector 203 can also be replaced by a light circulator. The above-mentioned optical switcher 20 04 can switch the wavelength of light entering the optical switcher. Therefore, the optical signal passing through the optical switcher 204 can be selectively entered into a fiber Bragg fiber grating 205 and an adjustable Bragg fiber grating 2. 6. Witherable Bragg fiber grating 2 07 or adjustable Bragg fiber grating 2 08. For an embodiment, the optical switch 204 is a ΐχ ν optical switch, and the 1 XN optical switch is for use with the above-mentioned wavelength-tunable optical fiber grating 2 〇5, 2 〇6, 2 0 7, 2 0 8 To achieve a wider bandwidth. The above-mentioned wavelength-tunable fiber gratings 2 0 5, 2 0 6, 2 7, 2 0 8 can reflect a fixed single light wavelength in the optical signal transmitted by the optical switch 2 4, and the rest of the light wavelengths pass through. The aforementioned wavelength-tunable fiber grating.

Page 15 1238581

Then, the light signal through the reflected light waveguide 2 0 5, 2 0 6, 2 0 7 or 2 0 8 passes through the optical switch and enters the above-mentioned optical switch 204 and is output. The laser light of the present invention can cover a frequency band of wavelengths from 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 jumpers are used to connect the above components and form a main laser resonant 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 3 00 excites an optical signal and enters an optical isolator 3 01, which is used to guide the optical signal for unidirectional transmission. The wavelength of the light excited by the pump laser source 300 is 1 480 nanometers (nm). 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, a single-mode optical fiber (smf) 304 is passed through the pump laser and the signal light excited by the above-mentioned pump laser source 300. Then, through a section of erbium-doped fiber 3 0 6, the pump laser and signal light passing through the wavelength selective consuming device 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 07 through a single-mode fiber (SMF) 3 0 5 and erbium-doped fiber 3 0 6. Then the light signal passes through

1238581 V. Description of the invention (9) The above-mentioned single-mode fiber (SMF) 3 04 returns to the above-mentioned wavelength selective coupler 302. After that, the optical signal enters an optical coupler 308. The above-mentioned optical coupler 30 8 can distribute light of different wavelengths transmitted by the above-mentioned wavelength-selective coupler 30 2. Therefore, the optical signal passing through the optical coupler 3 0 8 can selectively enter the reflected optical waveguide 3 0 9 and the reflected optical waveguide 3. 1 0, reflected light waveguide 3 1 1 or reflected light waveguide 3 1 2 For one embodiment, the above-mentioned reflected optical waveguides 309, 310, 311, and 31 2 are a wavelength-tunable fiber grating.

The 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 remaining optical wavelengths pass through the reflected optical waveguide. Then, the optical signal passing through the above-mentioned reflected optical waveguide can be output to a spectrometer (OSA) 313 for detection. In addition, the reflected light signal can enter the above-mentioned reflected light waveguides 309, 310, 311, 312 and continue another cycle. The wavelength T-mode optical fiber laser of the present invention also includes a plurality of optical fiber jumpers (not shown). The optical fiber jumpers are used to connect the above components and form a main laser resonant cavity. Refer to Figure 4 for the schematic diagram of the main body of the A + -type,% < -mode-type fiber grating. The carrier body 40 0 includes a movable platform 400. "The mobile platform 404 can be pushed onto the carrier body 400 and the adjustable fiber grating 4 01 is used to change the wavelength of the reflected light. "Ding" style, stubborn. The above-mentioned mobile platform 404 includes an optical carrier 402, a precision translation

Page 12 1238581

The moving collision plate 405 and the fixed baffle plate 40 6 are used for carrying the optical carrier 402. The fixed baffle plate 40 6 and the precision translation stage 403 are mentioned. The above-mentioned precision flat plate is used to carry and move the movable baffle plate 4G5; in addition, the above 1 / ίηί plate 40 and the fixed plate 406 are used at the same time, and can be used with precision translation 0 to achieve the pushing and loading The purpose of the modulated fiber grating 401. It should be noted that the above-mentioned precision translation stage 403 and the fixed baffle 406 can be used on the above-mentioned optical carrier 402. The above-mentioned movable broadcast board 4.5 can also be equal to: v can be fixed on the precision mobile station 4.3. The above-mentioned tailor-made optical fiber light I can be made of 4 materials, which can adjust the above wavelength to achieve a wider bandwidth. Even when the tunable optical fiber grating 401 is moved by the above mobile platform 4 0 4 to push, the tunable optical fiber grating 401 has ^ = adjustable optical fiber grating 4 (up or down). 'That is to say, the reflection wavelength is the short-wavelength ^ fiber grating 4〇1 upward curve; when the above-mentioned tunable fiber grating 4〇1 moves down, please refer to the fourth B series to move to the long wavelength range Please refer to / back curve, the reflection wavelength of the wavelength-tunable optical fiber grating 401 is subject to the second 129 C figure. That is, it can increase the range of wavelength adjustment when it is changed up. A different bend produces the The preferred embodiment is described above, but it is not intended to limit the present invention.

Page 18 1238581 V. Description of the invention (11) The scope of the patent right claimed by the invention. The scope of patent protection depends on the scope of patent application and its equivalent fields. Anyone skilled in this field can make changes or modifications without departing from the spirit or scope of this patent, which are all equivalent changes or designs made in the spirit disclosed by the present invention, and should be included in the scope of patent application described below. Inside.

Page 19, 1238581. Schematic illustration, simple illustration: 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 still another embodiment of the present invention. Fig. 4A is a schematic view showing the supporting body of the wavelength tunable fiber grating of the present invention. 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. Graphic 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 201238581 Schematic description of optical circulator 106, 307 Optocoupler 1 〇7 Polarization controller 1 0 8 Optical surface coupler 109, 308 Spectrometer (OSA) 110, 313 Optical switch 1 1 1, 2 0 4 Wavelength tunable fiber gratings 112, 113, 205, 206, 207 2 08 '3 0 9 > 310 > 31 312 Optical reflector 2 0 3 Wavelength selective coupler (WSC) 302 Single mode fiber (SMF) 3 04 305 Bearing body 400 Wavelength tunable optical fiber grating 4 0 1 Optical carrier 402 Precision translation stage 403 Mobile platform 404 Movable baffle 4 0 5 Fixed baffle 4 0 6

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Claims (1)

1238581_ 6. Scope of patent application Patent scope: 1. An optical fiber laser device comprising: an erbium-doped fiber amplifier; an optical circulator, which is used to limit and determine the light excited by the erbium-doped fiber amplification Transmission direction, an optical switch, the optical switch can switch the wavelength of light entering the optical switch; a plurality of reflected light waveguide elements, the reflected light waveguide elements can reflect the optical signal transmitted by the optical switch A fixed single light wavelength, the rest of the spectrum passes through the reflected light waveguide element; an optical coupler, which can be used to shape and form a laser resonant cavity and lead out 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 fiber-optic laser device according to item 1 of the patent application scope, wherein the laser light can cover a frequency band of a wavelength of 1530 to 1610 nanometers (n m). 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 123858] ___ 6. Scope of patent application 4. For the optical fiber laser device of scope 3 of the patent application, the optical switch can be a liquid crystal, mechanical, micro-electro-mechanical or integrated optical switch. 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 patent application scope, further comprising a carrying body for carrying the wavelength-tunable optical fiber optical thumb. 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-tunable optical fiber photo peach placed on the carrier body can be pushed by the mobile platform to achieve For the purpose of changing the wavelength of 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; The precision translation stage is used to carry and move the movable baffle plate; the movable baffle plate is used with the fixed baffle plate at the same time, and can be matched with the precision translation stage to push and carry the wavelength tunable fiber grating. Page 23 1238581__ VI. Application for patent scope 9. For the optical fiber laser device of the first scope of the patent application, the optical coupler is a 2X 2 optical coupler, and the laser secondary resonance formed by the 2X 2 optical coupler The 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 patent application range, wherein the optical coupler is a ratio type optical coupler, and the output ratio thereof may be 1 to 9 9 percent (%) ° 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 passing through the tool generate gain; the pump laser source can be used to pump the bait-doped fiber; a light reflector, which is used to reflect the wavelength of light; an optical switch, which The optical switcher can switch the wavelength of light entering and exiting the optical switcher; and a plurality of wavelength-tunable optical fiber gratings, the wavelength-tunable optical fiber cabinet can reflect a fixed single optical wavelength in the optical signal transmitted by the optical switcher The remaining light wavelengths pass through the wavelength-tunable fiber grating. 1 2. If the optical fiber laser device according to item 11 of the patent application scope, wherein the wavelength of the light excited by the pumping light source is 1480 nm (nm), the light of this wavelength can be Page 24 1238581 6. Scope of patent application Reduce optical transmission loss. 1 3 · If the optical fiber laser device according to item 11 of the patent application scope, wherein the optical switch is an IX N optical switch, the IX N optical switch is to be matched with the plurality of wavelength-tunable optical fiber gratings to achieve coverage. Wider bandwidth. 14. The optical fiber laser device according to item 13 of the patent application scope, 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 scope of patent application, 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 optical fiber thumb. 17 · If the optical fiber laser device according to item 16 of the patent application scope, wherein the carrier body includes a movable platform, the wavelength-tunable optical fiber optical tear can be pushed on the carrier body by the mobile platform, In order 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 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 1238581 VI. Patent application scope Grating. 1 8. A fiber optic laser device, comprising: a pump laser source; an optical isolator used to isolate reflected light signals; a wavelength selective coupler that allows the pump laser The laser and signal light excited by the source pass through; a section of erbium-doped fiber that allows the pump laser and signal light passing through the demultiplexer to generate gain; an optical circulator, which is used to Limit and determine the transmission direction of the light excited by the pump laser source; an optical coupler that can distribute light of different wavelengths transmitted by the wavelength selective coupler; a plurality of reflected light waveguide elements, the reflection The optical waveguide element allows a fixed single light wavelength to be reflected in the optical signal transmitted by the optical switch, and the rest of the spectrum passes through the reflected optical waveguide element, and the transmitted optical signal can be detected by a spectrometer; and a plurality of Optical fiber jumper, which is used to connect the above components and form the main laser resonance cavity. 19. The optical fiber laser device of claim 18, wherein the wavelength of the light excited by the pumping light source is 1480 nm (nm), and the light of this wavelength can reduce the optical transmission loss. Page 26 1238581 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 patent application scope, wherein the supporting body includes a movable platform, and the adjustable optical fiber grating placed on the unloaded body can be pushed by the moving 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 adjustable fiber grating Page 27