CN211859141U - Ultra-narrow linewidth pulse modulation laser - Google Patents
Ultra-narrow linewidth pulse modulation laser Download PDFInfo
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- CN211859141U CN211859141U CN202020351482.6U CN202020351482U CN211859141U CN 211859141 U CN211859141 U CN 211859141U CN 202020351482 U CN202020351482 U CN 202020351482U CN 211859141 U CN211859141 U CN 211859141U
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Abstract
The application provides an ultra-narrow linewidth pulse modulation laser, including first pump laser, first wavelength division multiplexer, phase shift grating, first erbium-doped fiber, first optical isolator, optical splitter, light signal modulation device, optical detector, second pump laser, second wavelength division multiplexer, second erbium-doped fiber, second optical isolator and output port. The ultra-narrow linewidth pulse modulation laser saves space and resources, can freely control all control parameters through a communication interface, can freely set the pulse width and the repetition frequency of an output pulse optical signal according to practical application, can adjust the power according to practical use conditions by passing through a two-stage erbium-doped optical fiber amplification optical path, and can flexibly meet different use requirements of different customers, wherein the peak optical power of the output laser can reach 500 milliwatts at most; the two-stage amplification optical path is integrated into one module, and the noise influence of vibration, temperature and the like on the ultra-narrow linewidth laser is greatly reduced by adopting a standard manufacturing process.
Description
Technical Field
The application relates to the technical field of lasers, in particular to an ultra-narrow linewidth pulse modulation laser.
Background
Distributed optical fiber sensing is currently divided into two categories, namely distributed optical fiber sensing based on Rayleigh scattering and distributed optical fiber sensing based on Brillouin scattering, and is applied to different engineering occasions based on different demodulation principles, wherein the two detection principles are based on that pulse laser signals with ultra-narrow line width enter a sensing optical fiber, so that vibration or temperature strain signals on the whole optical fiber can be detected. The current mainstream scheme is that an independent ultra-narrow linewidth laser, an independent acousto-optic modulator, an optical amplifier and the like are assembled together to realize an optical signal with adjustable pulse width, all devices are independently installed, the required space is large, each part needs to be independently controlled, and a plurality of power interfaces and communication interfaces are needed.
Disclosure of Invention
It is an object of the present application to address the above problems and to provide an ultra narrow linewidth pulse modulated laser.
The application provides an ultra-narrow linewidth pulse modulation laser, which comprises a first pump laser, a first wavelength division multiplexer, a phase shift grating, a first erbium-doped optical fiber, a first optical isolator, an optical splitter, an optical signal modulation device, an optical detector, a second pump laser, a second wavelength division multiplexer, a second erbium-doped optical fiber, a second optical isolator and an output port; the first pump laser is connected with the input end of the first wavelength division multiplexer; the output end of the first wavelength division multiplexer is connected with one end of the phase-shift grating; the other end of the phase-shift grating is connected with one end of the first erbium-doped fiber; the other end of the first erbium-doped fiber is connected with the input end of the first optical isolator; the output end of the first optical isolator is connected with the input end of the optical splitter; the main light splitting end of the light splitter is connected with the input end of the optical signal modulation device, and the secondary light splitting end of the light splitter is connected with the optical detector; the output end of the optical signal modulation device is connected with the first input end of the second wavelength division multiplexer; the second pump laser is connected with a second input end of the second wavelength division multiplexer; the output end of the second wavelength division multiplexer is connected with one end of the second erbium-doped fiber; the other end of the second erbium-doped fiber is connected with the input end of a second optical isolator; and the output end of the second optical isolator is connected with the output interface.
According to the technical scheme provided by some embodiments of the present application, the optical signal modulation device is any one of an acousto-optic modulator, an electro-optic modulator or a semiconductor amplifier.
According to the technical scheme provided by some embodiments of the present application, the splitting ratio of the splitter is 1: 99.
according to the technical scheme provided by some embodiments of the application, the output port adopts an FC/APC flange interface.
According to the technical solution provided by some embodiments of the present application, the ultra-narrow linewidth pulse modulated laser further includes an optical circulator; the output port is connected with the first port of the optical circulator; and the second port of the optical circulator is used for outputting optical signals, and the third port of the optical circulator is used for receiving the optical signals returned from the outside.
Compared with the prior art, the beneficial effect of this application: the ultra-narrow linewidth pulse modulation laser saves space and resources, can freely control all control parameters through a communication interface, can freely set the pulse width and the repetition frequency of an output pulse optical signal according to practical application, can adjust the power according to practical use conditions by passing through a two-stage erbium-doped optical fiber amplification optical path, and can flexibly meet different use requirements of different customers, wherein the peak optical power of the output laser can reach 500 milliwatts at most; the two-stage amplification optical path is integrated into one module, and the noise influence of vibration, temperature and the like on the ultra-narrow linewidth laser is greatly reduced by adopting a standard manufacturing process.
Drawings
Fig. 1 is a schematic structural diagram of an ultra-narrow linewidth pulse modulated laser according to an embodiment of the present disclosure.
The text labels in the figures are represented as:
1. a first pump laser; 2. a first wavelength division multiplexer; 3. a phase-shifted grating; 4. a first erbium-doped fiber; 5. a first optical isolator; 6. a light splitter; 7. a light detector; 8. an optical signal modulation device; 9. a second pump laser; 10. a second wavelength division multiplexer; 11. a second erbium-doped fiber; 12. a second optical isolator; 13. an output port; 14. an optical circulator.
Detailed Description
The following detailed description of the present application is given for the purpose of enabling those skilled in the art to better understand the technical solutions of the present application, and the description in this section is only exemplary and explanatory, and should not be taken as limiting the scope of the present application in any way.
Referring to fig. 1, the present embodiment provides an ultra-narrow linewidth pulse modulated laser, including a first pump laser 1, a first wavelength division multiplexer 2, a phase-shift grating 3, a first erbium-doped fiber 4, a first optical isolator 5, an optical splitter 6, an optical detector 7, an optical signal modulation device 8, a second pump laser 9, a second wavelength division multiplexer 10, a second erbium-doped fiber 11, a second optical isolator 12, and an output port 13; the first pump laser 1 and the second pump laser 9 are both used for outputting pump light with the wavelength of 980nm, and the working wavelengths of the first wavelength division multiplexer 2 and the second wavelength division multiplexer 10 are both 980nm/1550 nm; the first pump laser 1 is connected with the input end of the first wavelength division multiplexer 2; the output end of the first wavelength division multiplexer 2 is connected with one end of the phase shift grating 3; the other end of the phase shift grating 3 is connected with one end of a first erbium-doped fiber 4; the other end of the first erbium-doped fiber 4 is connected with the input end of a first optical isolator 5; the output end of the first optical isolator 5 is connected with the input end of the optical splitter 6; the main beam splitting end of the optical splitter 6 is connected with the input end of the optical signal modulation device 8, and the secondary beam splitting end is connected with the optical detector 7; the output end of the optical signal modulation device 8 is connected with the first input end of the second wavelength division multiplexer 10; the second pump laser 9 is connected with a second input end of the second wavelength division multiplexer 10; the output end of the second wavelength division multiplexer 10 is connected with one end of a second erbium-doped fiber 11; the other end of the second erbium-doped fiber 11 is connected with the input end of a second optical isolator 12; the output of the second opto-isolator 12 is connected to the output port 13.
Preferably, the optical signal modulation device 8 is any one of an acousto-optic modulator, an electro-optic modulator, or a semiconductor amplifier, and in the present embodiment, the optical signal modulation device 8 used is an acousto-optic modulator.
Preferably, the splitting ratio of the splitter 6 is 1: 99 for automatic power control of the laser. In other embodiments of the present application, the splitting ratio of the splitter 6 may be set to other values to achieve this function.
Preferably, the output port 13 is an FC/APC flange interface.
Preferably, the ultra-narrow linewidth pulse modulated laser further comprises an optical circulator 14; the output port 13 is connected with a first port of the optical circulator 14; the second port of the optical circulator 14 is used for outputting optical signals, and the third port is used for receiving external returned optical signals.
The ultra-narrow linewidth pulse modulation laser provided by the embodiment of the application, after pump light with the wavelength of 980nm output by a first pump laser 1 passes through a first wavelength division multiplexer 2, a phase shift grating 3, a first erbium-doped fiber 4 and a first optical isolator 5 in sequence, the linewidth of the output laser can reach below 3khz, then after the pump light is split by the optical splitter, 1% of laser light output by a sub-splitting end realizes power monitoring and automatic power control function of the laser through an optical detector 7, 99% of laser light output by the splitting end is modulated through an acousto-optic modulator, output of optical pulse signals with specified repetition frequency and pulse width can be realized, the modulated pulse light and pump light with the wavelength of 980nm emitted by a second pump laser 9 enter a second wavelength division multiplexer 10 together, and laser energy output after the modulated laser light passes through a second erbium-doped fiber 11 and a second optical isolator 12 is amplified and transmitted to an optical circulator 14 through an FC/APC flange interface, output through the second port of the optical circulator 14.
The ultra-narrow linewidth pulse modulation laser saves space and resources, can freely control all control parameters through one communication interface, can freely set the pulse width and the repetition frequency of an output pulse optical signal according to practical application, passes through a two-stage erbium-doped optical fiber amplification light path, can output the peak optical power of laser to 500 milliwatts at most, can adjust the power according to the practical use condition, and can meet different use requirements of different customers flexibly; the two-stage amplification optical path is integrated into one module, and the noise influence of vibration, temperature and the like on the ultra-narrow linewidth laser is greatly reduced by adopting a standard manufacturing process.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are no specific structures which are objectively limitless due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the technical features mentioned above can be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.
Claims (5)
1. A pulse modulation laser with ultra-narrow line width is characterized by comprising a first pump laser (1), a first wavelength division multiplexer (2), a phase shift grating (3), a first erbium-doped optical fiber (4), a first optical isolator (5), an optical splitter (6), an optical detector (7), an optical signal modulation device (8), a second pump laser (9), a second wavelength division multiplexer (10), a second erbium-doped optical fiber (11), a second optical isolator (12) and an output port (13);
the first pump laser (1) is connected with the input end of the first wavelength division multiplexer (2); the output end of the first wavelength division multiplexer (2) is connected with one end of the phase-shift grating (3); the other end of the phase-shift grating (3) is connected with one end of the first erbium-doped fiber (4); the other end of the first erbium-doped fiber (4) is connected with the input end of the first optical isolator (5); the output end of the first optical isolator (5) is connected with the input end of the optical splitter (6); the main light splitting end of the light splitter (6) is connected with the input end of the optical signal modulation device (8), and the secondary light splitting end of the light splitter is connected with the optical detector (7); the output end of the optical signal modulation device (8) is connected with the first input end of the second wavelength division multiplexer (10); the second pump laser (9) is connected with a second input end of the second wavelength division multiplexer (10); the output end of the second wavelength division multiplexer (10) is connected with one end of the second erbium-doped fiber (11); the other end of the second erbium-doped fiber (11) is connected with the input end of a second optical isolator (12); the output end of the second optical isolator (12) is connected with the output port (13).
2. The ultra-narrow linewidth pulse modulated laser according to claim 1, characterized in that the optical signal modulation means (8) is any one of an acousto-optic modulator, an electro-optic modulator or a semiconductor amplifier.
3. The ultra narrow linewidth pulse modulated laser according to claim 1, wherein the beam splitter (6) has a splitting ratio of 1: 99.
4. the ultra-narrow linewidth pulse modulated laser according to claim 1, characterized in that the output port (13) employs an FC/APC flange interface.
5. The ultra-narrow linewidth pulse modulated laser of claim 1, further comprising an optical circulator (14); the output port (13) is connected with a first port of the optical circulator (14); the second port of the optical circulator (14) is used for outputting optical signals, and the third port is used for receiving external returned optical signals.
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| CN202020351482.6U CN211859141U (en) | 2020-03-19 | 2020-03-19 | Ultra-narrow linewidth pulse modulation laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820691A (en) * | 2021-08-17 | 2021-12-21 | 厦门彼格科技有限公司 | High-precision optical delay phase regulation and control method with optical amplification |
| CN115411599A (en) * | 2022-09-26 | 2022-11-29 | 浙江大学 | An all-fiber laser wavelength converter for converting erbium laser into thulium laser and a thulium pulsed fiber laser |
-
2020
- 2020-03-19 CN CN202020351482.6U patent/CN211859141U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820691A (en) * | 2021-08-17 | 2021-12-21 | 厦门彼格科技有限公司 | High-precision optical delay phase regulation and control method with optical amplification |
| CN115411599A (en) * | 2022-09-26 | 2022-11-29 | 浙江大学 | An all-fiber laser wavelength converter for converting erbium laser into thulium laser and a thulium pulsed fiber laser |
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