CN110277730B - Integrated Brillouin scattering laser - Google Patents
Integrated Brillouin scattering laser Download PDFInfo
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- CN110277730B CN110277730B CN201910539768.9A CN201910539768A CN110277730B CN 110277730 B CN110277730 B CN 110277730B CN 201910539768 A CN201910539768 A CN 201910539768A CN 110277730 B CN110277730 B CN 110277730B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
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- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
An integrated Brillouin scattering laser, which sequentially comprises a laser generation module, a Stokes light signal generation module and an output module along an optical path: the laser generating module is used for generating parallel optical signals; the Stokes light signal generating module is used for converting the parallel light signal generated by the laser generating module into a Stokes light signal and comprises a first optical filter (3), a silicon-based micro-ring (4) and a second optical filter (5); and the output module is used for focusing, isolating and outputting the Stokes light signals generated by the Stokes light signal generating module. The integrated Brillouin scattering laser provided by the invention adopts the silicon-based micro-ring with smaller volume to replace the traditional optical fiber to realize the Brillouin nonlinear effect, and effectively reduces the size of the laser.
Description
Technical Field
The invention belongs to the technical field of semiconductors, and particularly relates to an integrated Brillouin scattering laser.
Background
Stimulated brillouin scattering is a nonlinear effect, and is receiving more and more attention from researchers at home and abroad due to the advantages of narrow bandwidth and low noise. In 1991, researchers proposed narrow linewidth single-frequency Brillouin fiber lasers, which mainly realized Brillouin nonlinear effects such as doping rare earth ions (such as Yb) through highly nonlinear fibers or longer single-mode fibers3+、Er3+Etc.) optical fiber, crystal optical fiber (such as Nd: YAG single crystal fiber) and general optical fiber, which have been the research hot spots due to the advantages of simple structure and narrow line width. But is bulky due to the long length of the optical fiber used.
The optical microcavity has the advantages of high integration level, small mode volume, high quality factor and the like, can replace the traditional laser structure with the optical fiber as a gain medium, makes up the defects that the optical fiber is sensitive to external temperature vibration and high-power pumping is needed for generating the nonlinear effect of the optical fiber, and can further realize high-frequency stability and narrower linewidth output.
Disclosure of Invention
Technical problem to be solved
In view of the above, an object of the present invention is to provide an integrated brillouin scattering laser that is reduced in size and can be miniaturized.
(II) technical scheme
The invention provides an integrated Brillouin scattering laser, which sequentially comprises a laser generation module, a Stokes light signal generation module and an output module along a light path, wherein:
the laser generating module is used for generating parallel optical signals;
the stokes light signal generating module is used for converting the parallel light signal generated by the laser generating module into a stokes light signal and comprises the following components:
the first optical filter 3 is used for transmitting the parallel optical signals output by the laser generation module and outputting the parallel optical signals to the silicon-based micro ring 4, and reflecting the Stokes optical signals converted by the silicon-based micro ring 4 and transmitted reversely to the second optical filter 5;
the silicon-based micro-ring 4 is used for receiving the parallel optical signals transmitted by the first optical filter 3, generating a Brillouin scattering effect when the input power of the optical signals received by the silicon-based micro-ring 4 reaches a Brillouin scattering threshold value, converting the parallel optical signals into Stokes optical signals and reversely transmitting the Stokes optical signals to the first optical filter 3; and
a second optical filter 5, for reflecting and outputting the stokes light signal reflected by the first optical filter 3;
and
the output module is used for focusing, isolating and outputting the Stokes light signals generated by the Stokes light signal generating module.
Wherein the laser generation module includes:
a high power DFB laser 1 for emitting divergent laser signals; and
and the collimating lens 2 is used for converting the divergent laser signal emitted by the high-power DFB laser 1 into a parallel optical signal and outputting the parallel optical signal.
Wherein the output module comprises:
a focusing lens 6 for focusing the stokes light signal output by the stokes light signal generating module and transmitting to the isolator 7;
the isolator 7 is used for isolating the Stokes light signals received from the focusing lens 6 and realizing the unidirectional transmission of the Stokes light signals; and
and the collimator optical fiber 8 is used for outputting the Stokes optical signal transmitted in one direction.
In an embodiment of the present invention, the silicon-based micro-ring 4 is a high-Q microcavity fabricated on silicon-based silicon dioxide, and has a Free Spectral Range (FSR) of 50GHz to 100GHz and a Q value greater than 105。
In an embodiment of the present invention, an included angle between the first optical filter 3 and the parallel optical signals converted by the collimating lens 2 is 45 °; the included angle between the stokes light signals reflected by the second optical filter 5 and the first optical filter 3 is 45 degrees; the bandwidth of the first optical filter 3 and the second optical filter 5 is 0.8nm-12nm, and the peak value transmittance is less than 50%.
In an embodiment of the present invention, the output power of the high-power DFB laser 1 is greater than or equal to 100mW, the line width is less than or equal to 100kHz, and the center wavelength is 1520nm to 1560 nm; the wavelength of the collimating lens 2 is 1520nm-1560nm, the focal length is 0.7mm, and the numerical aperture is 0.6 mm; the wavelength of the focusing lens 6 is 1520nm-1560nm, the focal length is 0.7mm, and the numerical aperture is 0.6 mm; the isolation of the isolator 7 is more than 30 dB; the working distance of the collimator fiber 8 is 5mm-25 mm.
(III) advantageous effects
According to the technical scheme, the integrated Brillouin scattering laser provided by the invention has the advantages that the Brillouin nonlinear effect is realized by adopting the silicon-based micro-ring with smaller volume, the optical fiber with larger volume in the traditional laser is replaced, the size of the laser is effectively reduced, and the size is small.
Drawings
To further illustrate the technical content of the present invention, the present invention is further described in detail below with reference to the following embodiments and the accompanying drawings, wherein:
fig. 1 shows a schematic structural diagram of an integrated brillouin scattering laser provided by the present invention.
[ description of reference ]
1: a high power DFB laser; 2: collimating lens
3: first filter 4: silicon-based micro-ring
5: second filter 6: focusing lens
7: the isolator 8: collimator optical fiber
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
In order to solve the technical problem of larger laser volume caused by longer optical fiber, the invention provides an integrated Brillouin scattering laser, the structure of which is shown in figure 1, wherein a solid line is a path of a Stokes optical signal; the dashed arrows are the paths of the laser signals emitted by the lasers.
Referring to fig. 1, the present invention provides an integrated brillouin scattering laser, which includes a laser generation module, a stokes optical signal generation module and an output module in sequence along an optical path, wherein:
the laser generating module is used for generating parallel optical signals;
the stokes light signal generating module is used for converting the parallel light signal generated by the laser generating module into a stokes light signal and comprises the following components:
the first optical filter 3 is used for transmitting the parallel optical signals output by the laser generation module and outputting the parallel optical signals to the silicon-based micro ring 4, and reflecting the Stokes optical signals converted by the silicon-based micro ring 4 and transmitted reversely to the second optical filter 5;
the silicon-based micro-ring 4 is used for receiving the parallel optical signals transmitted by the first optical filter 3, generating a Brillouin scattering effect when the input power of the optical signals received by the silicon-based micro-ring 4 reaches a Brillouin scattering threshold value, converting the parallel optical signals into Stokes optical signals and reversely transmitting the Stokes optical signals to the first optical filter 3; and
a second optical filter 5 for reflecting the Stokes light signal reflected by the first optical filter 3
Outputting after reflection;
and
the output module is used for focusing, isolating and outputting the Stokes light signals generated by the Stokes light signal generating module.
Wherein, the laser generation module includes:
a high power DFB laser 1 for emitting divergent laser signals; and
and the collimating lens 2 is used for converting the divergent laser signal emitted by the high-power DFB laser 1 into a parallel optical signal and outputting the parallel optical signal.
Wherein, output module includes:
a focusing lens 6 for focusing the stokes light signal output by the stokes light signal generating module and transmitting to the isolator 7;
the isolator 7 is used for isolating the Stokes light signals received from the focusing lens 6 and realizing the unidirectional transmission of the Stokes light signals; and
and the collimator optical fiber 8 is used for outputting the Stokes optical signal transmitted in one direction.
In an embodiment of the invention, the high-power DFB laser 1 adopts an asymmetric structure, further improves the limiting capability of current carriers, and increases the output power of the laser, wherein the output power is more than or equal to 100mW, the line width is less than or equal to 100kHz, and the center wavelength is 1520nm-1560 nm.
In an embodiment of the present invention, the silicon-based micro-ring 4 is a high-Q micro-cavity fabricated on silicon-based silicon dioxide, the FSR of the micro-cavity is 50GHz-100GHz, and the Q value is greater than 105. When the input power of the input optical signal received by the silicon-based micro-ring 4 reaches the Brillouin scattering threshold value, a stimulated Brillouin scattering effect occurs in the silicon-based micro-ring to generate stronger backward-transmitted Stokes light. The key to realize certain nonlinear effect in the silicon-based micro-ring 4 is to satisfy the phase matching condition, and all parameters in the microcavityThe frequency of the nonlinear process is required to fall on the cavity mode to effectively realize resonance enhancement, so that a group of cavity modes are required for realizing phase matching, the frequency of the cavity modes meets the energy conservation condition, and the mode number meets the momentum matching condition. Due to the periodic boundary conditions of the microcavity, which is precisely the opposite of achieving phase matching in a waveguide where the frequency is continuous, the energy conservation condition is easily satisfied preferentially. Because the silicon-based micro-ring has smaller volume, the size of the laser is effectively reduced, and the silicon-based micro-ring has the advantage of small volume.
In one embodiment of the present invention, the wavelength of the collimating lens 2 is 1520nm-1560nm, the focal length is 0.7mm, and the numerical aperture is 0.6 mm; the wavelength of the focusing lens 6 is 1520nm-1560nm, the focal length is 0.7mm, and the numerical aperture is 0.6 mm; the isolation of the isolator 7 is greater than 30 dB; the working distance of the collimator fiber 8 is 5mm-25 mm.
In an embodiment of the present invention, an included angle between the first optical filter 3 and the parallel optical signal converted by the collimating lens 2 is 45 °; the included angle between the stokes light signals reflected by the second optical filter 5 and the first optical filter 3 is 45 degrees; the bandwidth of the first optical filter 3 and the second optical filter 5 is 0.8nm-12nm, and the peak value transmittance is less than 50%.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An integrated Brillouin scattering laser, which comprises a laser generation module, a Stokes light signal generation module and an output module along an optical path in sequence, wherein:
the laser generating module is used for generating parallel optical signals;
the stokes light signal generating module is used for converting the parallel light signal generated by the laser generating module into a stokes light signal and comprises the following components:
the first optical filter (3) is used for transmitting the parallel optical signals output by the laser generation module and outputting the parallel optical signals to the silicon-based micro ring (4), and reflecting the reverse-transmitted Stokes optical signals converted by the silicon-based micro ring (4) to the second optical filter (5);
the silicon-based micro-ring (4) is used for receiving the parallel optical signals transmitted by the first optical filter (3), generating a Brillouin scattering effect when the input power of the optical signals received by the silicon-based micro-ring (4) reaches a Brillouin scattering threshold value, converting the parallel optical signals into Stokes optical signals and reversely transmitting the Stokes optical signals to the first optical filter (3); and
the second optical filter (5) is used for outputting the Stokes light signals reflected by the first optical filter (3) after being reflected;
and
the output module is used for focusing, isolating and outputting the Stokes light signals generated by the Stokes light signal generating module.
2. The laser according to claim 1, characterized in that said silicon-based microring (4) is a high-Q microcavity fabricated on silica-on-silicon with a free spectral range of 50GHz-100GHz and a Q value greater than 105。
3. A laser according to claim 1, characterized in that the angle between the second filter (5) and the stokes' light signal after reflection from the first filter (3) is 45 °.
4. The laser according to claim 1, characterized in that the first filter (3) has a bandwidth of 0.8nm to 12nm and a peak transmittance of < 50%; the bandwidth of the second optical filter (5) is 0.8nm-12nm, and the peak value transmittance is less than 50%.
5. The laser of claim 1, wherein the laser generation module comprises:
a high power DFB laser (1) for emitting a diverging laser signal; and
and the collimating lens (2) is used for converting the divergent laser signals emitted by the high-power DFB laser (1) into parallel optical signals and outputting the parallel optical signals.
6. A laser according to claim 5, characterized in that the angle between the first filter (3) and the parallel optical signal converted by the collimating lens (2) is 45 °.
7. The laser according to claim 5, characterized in that the high power DFB laser (1) has an output power of 100mW or more, a line width of 100kHz or less, and a center wavelength of 1520nm to 1560 nm.
8. The laser according to claim 6, characterized in that the wavelength of the collimating lens (2) is 1520nm-1560nm, the focal length is 0.7mm, and the numerical aperture is 0.6 mm.
9. The laser of claim 1, wherein the output module comprises:
a focusing lens (6) for focusing the stokes light signal output by the stokes light signal generating module and transmitting to the isolator (7);
the isolator (7) is used for isolating the Stokes light signal received from the focusing lens (6) to realize the unidirectional transmission of the Stokes light signal; and
and the collimator optical fiber (8) is used for outputting the Stokes light signal transmitted in one direction.
10. The laser according to claim 9, characterized in that the focusing lens (6) has a wavelength of 1520nm-1560nm, a focal length of 0.7mm and a numerical aperture of 0.6 mm.
11. The laser according to claim 9, characterized in that the isolation of the isolator (7) is greater than 30 dB.
12. A laser according to claim 9, characterized in that the working distance of the collimator fiber (8) is 5-25 mm.
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| US7532656B2 (en) * | 2005-02-16 | 2009-05-12 | The Trustees Of Columbia University In The City Of New York | All-silicon raman amplifiers and lasers based on micro ring resonators |
| CN201680924U (en) * | 2010-04-13 | 2010-12-22 | 中国计量学院 | Distributive optical fiber Raman and Brillouin scattering sensor |
| US9046494B2 (en) * | 2010-12-28 | 2015-06-02 | Agency For Science, Technology And Research | Optical sensing system and a method of determining a change in an effective refractive index of a resonator of an optical sensing system |
| CN104617473B (en) * | 2015-02-11 | 2017-10-10 | 太原理工大学 | Filter with low insertion loss Three links theory narrow linewidth Brillouin optical fiber laser |
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| CN101349780A (en) * | 2008-08-30 | 2009-01-21 | 中北大学 | Plane annular micro-cavity |
| CN102681287A (en) * | 2012-05-18 | 2012-09-19 | 上海交通大学 | Full optical code type conversion system based on stimulated Brillouin scattering effect |
| CN104270202A (en) * | 2014-10-21 | 2015-01-07 | 武汉邮电科学研究院 | Multi-wavelength light source based on stimulated raman scattering effect |
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