CN215452039U - Narrow linewidth optical fiber laser generation device for inhibiting stimulated Brillouin scattering effect - Google Patents
Narrow linewidth optical fiber laser generation device for inhibiting stimulated Brillouin scattering effect Download PDFInfo
- Publication number
- CN215452039U CN215452039U CN202120922622.5U CN202120922622U CN215452039U CN 215452039 U CN215452039 U CN 215452039U CN 202120922622 U CN202120922622 U CN 202120922622U CN 215452039 U CN215452039 U CN 215452039U
- Authority
- CN
- China
- Prior art keywords
- laser
- narrow
- linewidth
- brillouin scattering
- stimulated brillouin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model belongs to the field of optical fiber lasers, and particularly relates to a narrow-linewidth optical fiber laser generation device for inhibiting a stimulated Brillouin scattering effect. The laser generating device comprises a narrow linewidth laser seed source for super-fluorescence source filtering, wherein the narrow linewidth laser seed source is used for outputting wide-spectrum incoherent light, and filtering is carried out by using a narrow linewidth fiber grating to obtain narrow linewidth laser; the optical fiber pre-amplifier is used for amplifying the laser power to a proper magnitude; and the passive spectrum broadening module is used for broadening the laser to a proper spectrum width. And the high-power amplification module is used for amplifying the narrow linewidth laser to required power. The utility model improves the effect of stimulated Brillouin scattering threshold of the optical fiber laser amplifier, and has the advantages of full optical fiber, simple structure and low cost.
Description
Technical Field
The utility model belongs to the field of optical fiber lasers, and particularly relates to a narrow-linewidth optical fiber laser generation device for inhibiting a stimulated Brillouin scattering effect.
Background
The narrow-linewidth high-power optical fiber laser has important application in the fields of beam combination, laser frequency conversion, laser communication and the like. The stimulated brillouin scattering effect is one of the main factors limiting the laser power increase. In order to suppress the intensity of the stimulated brillouin scattering effect, researchers at home and abroad have proposed various methods including using a large mode field optical fiber, applying a temperature gradient or a stress gradient to the optical fiber, and appropriately broadening a laser spectrum.
The method is an effective technical scheme for suppressing the stimulated brillouin scattering effect in the amplifier by properly widening a laser spectrum. A commonly used broadening method is to perform phase modulation on a single-frequency laser by using a radio frequency signal with a gigahertz bandwidth, such as a White Noise (WNS) signal or a pseudo random sequence (PRBS) digital signal, to obtain a narrow linewidth seed light with a linewidth of 0.1 nm. The power amplification of the broadened seed light is achieved, and the output power of the broadened seed light exceeds 4 kW.
However, a scheme system for realizing spectrum broadening by adopting phase modulation needs a plurality of radio frequency signal sources, electro-optic phase modulators and corresponding circuit control modules, and has the disadvantages of complex structure, high cost and insufficient reliability. Therefore, developing a new spectrum broadening technology, improving the reliability of a high-power laser system, reducing the system cost, and simultaneously keeping the stimulated Brillouin scattering threshold of the laser at a higher level becomes an important research direction.
SUMMERY OF THE UTILITY MODEL
Compared with the existing method for realizing spectrum broadening by phase modulating laser through radio frequency signals, the narrow linewidth optical fiber laser generation device for inhibiting the stimulated Brillouin scattering effect improves the effect of the stimulated Brillouin scattering threshold of the optical fiber laser amplifier, has the advantages of full optical fiber, simple structure and low cost, and lays a foundation for large-scale application of narrow linewidth high-power lasers.
In order to achieve the technical purpose, the utility model adopts the following specific technical scheme:
a narrow linewidth optical fiber laser generating device for suppressing a stimulated Brillouin scattering effect, the laser generating device comprising,
the narrow linewidth laser seed source 101 for super-fluorescence source filtering is used for outputting wide-spectrum incoherent light, and filtering is carried out by using a narrow linewidth fiber bragg grating to obtain narrow linewidth laser;
a fiber pre-amplifier 102 for amplifying the magnitude of the laser power;
the passive spectrum broadening module 103 is used for broadening the spectrum width of the laser;
and the high-power amplification module 104 is used for amplifying the narrow linewidth laser to required power.
Further, the passive spectrum broadening module 103 adopts a passive optical fiber.
Further, the passive fiber is G652D or HI1060 or PLMA-10/125.
Further, the length of the passive fiber is at least 100 meters.
Further, the time domain of the narrow linewidth laser generated by the narrow linewidth laser seed source 101 of the super-fluorescence source filtering is continuous laser.
Further, the polarization direction of the narrow linewidth laser generated by the narrow linewidth laser seed source 101 of the super-fluorescence source filtering is linear polarization or random polarization or elliptical polarization. Further, the narrow linewidth laser seed source 101 for filtering the super-fluorescence source is a DFB laser or a DBR laser or a laser for filtering the super-fluorescence source or a random distributed feedback laser.
The utility model has the following beneficial effects:
1. the utility model provides a narrow linewidth optical fiber laser generation device for inhibiting a stimulated Brillouin scattering effect, which can realize pre-broadening of a narrow linewidth laser spectrum so as to achieve the effect of improving the stimulated Brillouin scattering threshold of an optical fiber laser amplifier. Compared with the existing method for carrying out phase modulation by utilizing radio frequency signals, the method does not need an additional radio frequency signal source, has a simple structure, has the advantage of full optical fiber and is convenient for system integration.
2. The utility model can realize flexible adjustment of sub-nanometer level spectral width by adjusting the length of the optical fiber, and is suitable for a narrow-linewidth optical fiber laser system used for spectral synthesis. The output power of the narrow linewidth optical fiber amplifier can be greatly improved.
Drawings
Fig. 1 is a block diagram schematically showing the structure of a narrow-linewidth fiber laser generating apparatus for suppressing a stimulated brillouin scattering effect;
FIG. 2 is an unsharpened spectrum in the example;
FIG. 3 is a spectrum broadened by the method of the present invention in an example.
Description of reference numerals:
101. a narrow linewidth laser seed source for filtering the super-fluorescence source; 102. the optical fiber pre-amplifier comprises an optical fiber pre-amplifier 103 and a passive spectrum broadening module; 104. a high power fiber amplifier stage.
Detailed Description
In order to make the embodiments of the present invention more clear, the present invention will be explained in detail below with reference to the accompanying drawings and examples. The specific embodiments described herein are merely illustrative of the utility model and do not limit the scope of the utility model as claimed.
The narrow linewidth optical fiber laser generation device for inhibiting the stimulated Brillouin scattering effect injects a narrow linewidth laser signal into a long-distance optical fiber, and realizes the broadening of the spectrum by utilizing the self-phase modulation of the laser signal so as to achieve the purpose of inhibiting the stimulated Brillouin scattering effect. When the spectrum of the narrow-linewidth laser signal is broadened, the gain of the stimulated Brillouin scattering effect is obviously reduced; when the line width is more widened, the corresponding effective Brillouin gain spectrum is wider, the gain of stimulated Brillouin scattering is smaller, and the stimulated Brillouin scattering threshold of the laser is higher.
Example (b):
as shown in fig. 1, the narrow linewidth fiber laser generation apparatus for suppressing the stimulated brillouin scattering effect according to this embodiment includes:
the narrow linewidth laser seed source 101 of the super-fluorescence source filter, the super-fluorescence source works in the spontaneous radiation state of the gain fiber, outputs the incoherent light of the wide spectrum, and utilizes the narrow linewidth fiber grating to filter, and the laser signal of the narrow linewidth is obtained. The spectrum of the laser signal is shown in FIG. 2, with a center wavelength of 1064nm and a full width at half maximum of 0.07 nm. The light source type of the narrow-linewidth laser signal generated in the narrow-linewidth fiber laser generating device for inhibiting the stimulated Brillouin scattering effect is not limited, and the narrow-linewidth fiber laser generating device can be a fiber laser, and can also be a solid laser or a semiconductor laser coupled and output by fiber. The principle of the light source may be a DFB laser, DBR laser, superfluorescent source filtered laser or a randomly distributed feedback laser. The generated laser signal is continuous light in the time domain. The polarization state of the laser signal is not limited, and the laser signal can be circularly polarized light, elliptically polarized light or linearly polarized light.
The fiber pre-amplifier 102 is used for amplifying the magnitude of the signal power. The power of the laser signal may affect the intensity of the self-phase modulation effect in the subsequent passive spectrum broadening module 103, and affect the spectrum broadening effect, in this embodiment, the power of the laser signal is amplified to 1W;
and the passive spectrum broadening module 103 is used for broadening the spectrum width of the laser signal. The fiber type that plays a role in passive spectral broadening in this embodiment is G652D communication fiber. A narrow linewidth laser signal of 1W average power is injected into a passive optical fiber of 4km length, and the spectral linewidth is broadened to 0.21nm under the effect of self-phase modulation effect in the optical fiber, as shown in fig. 3. The types of passive fibers used to spectrally broaden narrow linewidth laser signals can be matched to the fibers used in the seed source as desired, including but not limited to: G652D, HI1060, PLMA-10/125 and the like. The length of the optical fiber is in the order of hundreds of meters and kilometers, which is far longer than the typical length of the optical fiber used by the common optical fiber laser.
The degree of spectral broadening after passing through the passive optical fiber is determined by parameters such as dispersion coefficient, nonlinear coefficient of the optical fiber and power of laser signals. The relationship between the lengths of different types of optical fibers and the broadened spectral width can be calculated by solving the nonlinear Schrodinger equation of the optical fibers. The fiber nonlinear schrodinger equation is as follows:
z represents the fiber length, α represents the fiber loss, β2The method comprises the steps of representing group velocity dispersion of an optical fiber, gamma representing a nonlinear coefficient of the optical fiber, A (z, t) representing slow amplitude fluctuation of a continuous laser signal, obtaining a spectrum of the laser signal through Fourier transform, and then obtaining a broadened spectrum width.
The embodiment further includes a high power amplification module 104 for amplifying the narrow linewidth laser signal to a required power. According to the formula estimation of the laser line width and the stimulated Brillouin scattering threshold of the amplification stage, after the spectrum is broadened, the upper limit of the power of the laser can be improved by 3 times.
The present invention is disclosed above and not limited thereto, and the scope of the present invention is defined by the claims.
Claims (7)
1. A narrow linewidth fiber laser generation device for inhibiting stimulated Brillouin scattering effect is characterized in that: the laser generating device comprises a laser generating device and a laser generating device,
the narrow linewidth laser seed source (101) for super-fluorescence source filtering is used for outputting wide-spectrum incoherent light, and filtering is carried out by using a narrow linewidth fiber grating to obtain narrow linewidth laser;
a fiber pre-amplifier (102) for amplifying the magnitude of the laser power;
a passive spectral broadening module (103) for broadening a spectral width of the laser light;
and the high-power amplification module (104) is used for amplifying the narrow-linewidth laser to required power.
2. The narrow-linewidth fiber laser generating device for suppressing the stimulated brillouin scattering effect according to claim 1, wherein: the passive spectrum broadening module (103) adopts passive optical fibers.
3. The narrow-linewidth fiber laser generating device for suppressing the stimulated brillouin scattering effect according to claim 2, wherein: the passive fiber is G652D or HI1060 or PLMA-10/125.
4. The narrow-linewidth fiber laser generating device for suppressing the stimulated brillouin scattering effect according to claim 2, wherein: the length of the passive optical fiber is at least 100 meters.
5. The narrow-linewidth fiber laser generating device for suppressing the stimulated brillouin scattering effect according to claim 1, wherein: the time domain of the narrow linewidth laser generated by the narrow linewidth laser seed source (101) of the super-fluorescence source filtering is continuous laser.
6. The narrow-linewidth fiber laser generating device for suppressing the stimulated brillouin scattering effect according to claim 1, wherein: the polarization direction of the narrow linewidth laser generated by the narrow linewidth laser seed source (101) of the super-fluorescence source filtering is linear polarization or random polarization or elliptical polarization.
7. The narrow-linewidth fiber laser generating device for suppressing the stimulated brillouin scattering effect according to claim 1, wherein: the narrow linewidth laser seed source (101) for filtering the super-fluorescence source is a DFB laser or a DBR laser or a laser for filtering the super-fluorescence source or a random distributed feedback laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120922622.5U CN215452039U (en) | 2021-04-30 | 2021-04-30 | Narrow linewidth optical fiber laser generation device for inhibiting stimulated Brillouin scattering effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120922622.5U CN215452039U (en) | 2021-04-30 | 2021-04-30 | Narrow linewidth optical fiber laser generation device for inhibiting stimulated Brillouin scattering effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215452039U true CN215452039U (en) | 2022-01-07 |
Family
ID=79706215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120922622.5U Active CN215452039U (en) | 2021-04-30 | 2021-04-30 | Narrow linewidth optical fiber laser generation device for inhibiting stimulated Brillouin scattering effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215452039U (en) |
-
2021
- 2021-04-30 CN CN202120922622.5U patent/CN215452039U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8275264B2 (en) | Optical waveform controlling apparatus | |
| CN111342332B (en) | Active mode-locking photoelectric oscillator | |
| Yu et al. | Optimization of the frequency response of a semiconductor optical amplifier wavelength converter using a fiber Bragg grating | |
| Chow et al. | Widely tunable wavelength converter using a double-ring fiber laser with a semiconductor optical amplifier | |
| Janer et al. | Optical phase conjugation technique using four-wave mixing in semiconductor optical amplifier | |
| CN103513491B (en) | A kind of method and apparatus producing optical frequency com based on Parabolic Phase modulation | |
| CN215452039U (en) | Narrow linewidth optical fiber laser generation device for inhibiting stimulated Brillouin scattering effect | |
| CN113097850A (en) | Narrow-linewidth optical fiber laser generation device and method for inhibiting stimulated Brillouin scattering effect | |
| Rani et al. | Performance evaluation of DWDM system using semiconductor optical amplifier in the presence of fiber non-linearities | |
| Marconi et al. | Narrow linewidth fibre-optical wavelength converter with strain suppression of SBS | |
| CN113097847A (en) | Novel narrow-linewidth high-power optical fiber laser generation device and method based on dispersion management | |
| CN113991404A (en) | Noise signal generating device and method | |
| CN114336227A (en) | Microwave signal generating device based on low-distortion dissipative Kerr soliton | |
| Shi et al. | Real-time definite sequence modulation based spectral broadening scheme for high-power narrow-linewidth fiber laser | |
| Guo et al. | Cross-gain modulation suppression in a Raman-assisted fiber optical parametric amplifier | |
| USH2190H1 (en) | Sampled analog transmission | |
| Hashimoto et al. | 40-GHz tunable optical pulse generation from a highly-stable external-cavity mode-locked semiconductor laser module | |
| Suzuki et al. | 5 Gbit/s, 250 km error-free soliton transmission with Er3+-doped fibre amplifiers and repeaters | |
| Shi et al. | High SBS threshold fiber laser with spectral management using binarized multi-tone signal modulation | |
| CN111834869A (en) | Chaotic light source all-optical phase modulation seed source for high-power narrow-spectrum optical fiber amplification | |
| Kharraz et al. | Polarization-independent ASE four-wave mixing in a fast semiconductor optical amplifier | |
| CN112467504B (en) | Intensity noise suppression device of ultra-short pulse optical fiber amplifier | |
| CN117595056A (en) | High-power fiber laser frequency spectrum linear regulation and optimization method | |
| CN111442851B (en) | Time lens measuring system based on Raman soliton self-frequency shift | |
| Hu et al. | All-optical tunable delay line based on wavelength conversion in semiconductor optical amplifiers and dispersion in dispersion-compensating fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |