阅读说明：本技术 一种多波长布里渊光纤激光器 (Multi-wavelength Brillouin fiber laser ) 是由 徐荣辉 张先强 牛国振 汪杰君 张文涛 苑立波 于 2020-07-20 设计创作，主要内容包括：本发明公开了一种多波长布里渊光纤激光器,包括窄线宽可调激光器(1)、第一光纤耦合器(2)、第一光放大器(3)、四端口光环形器(4)、第一布里渊光纤(5)、三端口光环形器(6)、第二布里渊光纤(7)、第二光放大器(8)、第二光纤耦合器(9),窄线宽可调激光器(1)输出的激光做为布里渊泵浦(BP),BP在第一布里渊光纤中发生受激布里渊散射产生一阶斯托克斯(BS1),BS1在第二布里渊光纤中发生级联受激布里渊散射产生二阶斯托克斯(BS2)和三阶斯托克斯(BS3),借助第一光放大器和第二光放大器的功率增益作用,这样就可以获得波长间隔为三倍布里渊频移值的多波长光纤激光器。该多波长光纤激光器具有简单的结构,成本低,在光通信、波分复用系统,微波光子及光纤传感网络中均具有应用潜力。(The invention discloses a multi-wavelength Brillouin optical fiber laser, which comprises a narrow linewidth adjustable laser (1), a first optical fiber coupler (2), a first optical amplifier (3), a four-port optical circulator (4), a first Brillouin optical fiber (5), a three-port optical circulator (6), a second Brillouin optical fiber (7), a second optical amplifier (8) and a second optical fiber coupler (9), wherein laser output by the narrow linewidth adjustable laser (1) is used as a Brillouin Pump (BP), the BP generates stimulated Brillouin scattering in the first Brillouin optical fiber to generate a first-order Stokes (BS1), the BS1 generates cascade stimulated Brillouin scattering in the second Brillouin optical fiber to generate a second-order Stokes (BS2) and a third-order Stokes (BS3), and by means of power gain effects of the first optical amplifier and the second optical amplifier, thus, a multi-wavelength fiber laser with a wavelength interval of three times the Brillouin frequency shift value can be obtained. The multi-wavelength fiber laser has a simple structure and low cost, and has application potential in optical communication, wavelength division multiplexing systems, microwave photons and fiber sensing networks.)

1. A multi-wavelength Brillouin fiber laser is characterized by comprising a narrow linewidth adjustable laser (1), a first fiber coupler (2), a first optical amplifier (3), a four-port optical circulator (4), a first Brillouin fiber (5), a three-port optical circulator (6), a second Brillouin fiber (7), a second optical amplifier (8) and a second fiber coupler (9).

2. The multi-wavelength Brillouin optical fiber laser is characterized in that the output end of a narrow linewidth adjustable laser (1) is connected with an A1 port at the A end of a four-port optical fiber coupler (2), a B1 port at the B end of the four-port optical fiber coupler is connected with the input end of a first optical amplifier (3), a 41 port of a four-port optical circulator (4) is connected with the output end of the first optical amplifier, a 42 port of the four-port optical circulator (4) is connected with one end of a first Brillouin optical fiber (5), a 62 port of a three-port optical circulator (6) is connected with the other end of the first Brillouin optical fiber (5), a 61 port and a 63 port of the three-port optical circulator (6) are connected, a 43 port of the four-port optical circulator (4) is connected with one end of a second Brillouin optical fiber (7), and the other end of the second Brillouin optical fiber (7) is connected with one end of a second optical amplifier (8), the 44 port of the four-port optical circulator (4) is connected with the D1 port of the D end of the second optical fiber coupler (9), the C1 port of the C end of the second optical fiber coupler is connected with the other end of the second optical amplifier, the D2 port of the D end of the second optical fiber coupler is connected with the A2 port of the A end of the first optical fiber coupler, the B2 port of the B end of the first optical fiber coupler is the laser output port of the multi-wavelength Brillouin optical fiber laser, and the laser output port can be connected to an optical spectrum analyzer.

3. The multi-wavelength Brillouin optical fiber laser is characterized in that laser output by a narrow-linewidth adjustable laser is used as Brillouin pump light (BP), the BP enters a first optical amplifier (3) through a port B1 of a first optical fiber coupler (2) to be amplified, the amplified BP is injected into one end of a first Brillouin gain optical fiber (5) through a port 42 of a four-port optical fiber circulator (4) and generates Brillouin scattering with the one end, when the power of the BP exceeds the stimulated Brillouin threshold value of the first Brillouin optical fiber, first-order Stokes light (BS1) with the frequency shift value transmitted in the reverse direction of the BP is generated, a three-port optical circulator (6) is used as an optical fiber reflector and reflects residual forward BP back to the first Brillouin optical fiber to enhance the power of BS1, the BS1 is injected into one end of a second Brillouin optical fiber (7) through a port 43 of the four-port optical circulator (4) and generates Brillouin scattering with the one end, when the power of the BS1 is enough, second-order Stokes light (BS2) with the frequency shifted by the Brillouin frequency shift value is excited in the second Brillouin optical fiber, the BS2 is output from a 44 port of the four-port optical fiber circulator (4), enters the second optical amplifier (8) through the second optical fiber coupler (9) to be amplified, the amplified BS2 is injected into the other end of the second Brillouin optical fiber (7) and generates Brillouin scattering with the other end of the second Brillouin optical fiber, when the power of the BS2 exceeds the stimulated Brillouin threshold value of the second Brillouin optical fiber, third-order Stokes light (BS3) with the frequency shifted by the Brillouin frequency shift value is generated, the BS3 is amplified by the second optical amplifier, one part of the BS3 enters the first optical amplifier through a C1-D2-A2-B1 to be amplified as the Brillouin pumping light output from a first optical fiber 3 which is output by the first optical fiber 2, due to the power gain functions of the first optical amplifier and the second optical amplifier, on one hand, power loss in an optical path is compensated, on the other hand, Stokes light is amplified, stimulated Brillouin scattering processes in the first Brillouin optical fiber and the second Brillouin optical fiber can occur in a cascade mode, and therefore multi-wavelength Brillouin laser with triple Brillouin frequency shift value wavelength intervals can be observed by a spectrum analyzer at a port B2 of the first optical fiber coupler.

4. The multi-wavelength Brillouin fiber laser is characterized in that the first Brillouin fiber and the second Brillouin fiber are single-mode quartz fibers with the same Brillouin frequency shift value.

5. The multi-wavelength Brillouin fiber laser is characterized in that the first optical amplifier and the second optical amplifier are both self-made erbium-doped fiber amplifiers, wherein the second optical amplifier can amplify bidirectionally.

Technical Field

The invention relates to the technical fields of optical fiber communication technology, optical fiber laser technology and microwave photon technology, in particular to a multi-wavelength Brillouin optical fiber laser with triple Brillouin frequency shift wavelength intervals.

Background

With the rapid development of internet technology and various communication technologies, the development trend of all-optical communication networks is going to be toward ultra-high speed, ultra-large capacity, and long-distance transmission. The multi-wavelength fiber laser is an effective way to combine the nonlinear gain in the brillouin gain fiber with the linear gain of the erbium-doped fiber amplifier to generate a large number of multiple wavelengths. The multi-wavelength fiber laser has potential application in the aspects of large-capacity dense wavelength division multiplexing systems, microwave photonics, fiber sensing networks, optical element tests and the like.

The multi-wavelength Brillouin fiber laser has the following advantages: the tunable optical fiber has stable multi-wavelength output, wide tunable range, low threshold power, low noise intensity and the like at room temperature. Most studies now also have stayed on multi-wavelength outputs with single or double brillouin shifts, with the single brillouin shift spacing of the standard single mode fibre being about 0.08 nm. Such a wavelength interval makes signal conditioning difficult and also causes crosstalk between channels to increase the bit error rate, which is far from satisfying the needs of modern technologies. Therefore, the research on triple or even more multiple wavelength brillouin fiber lasers with simple and practical structures has become an urgent need of various technologies.

Disclosure of Invention

The invention aims to provide a multi-wavelength Brillouin fiber laser, which generates cascade stimulated Brillouin scattering through Brillouin pump light in two rolls of common single-mode quartz fibers with the same Brillouin frequency shift, can realize circulating cascade Brillouin frequency shift due to the power gain effect of an optical amplifier, thereby realizing multi-wavelength Brillouin laser output with a wavelength interval of three times of Brillouin frequency shift (about 30 GHz).

The invention adopts the following technical scheme for solving the technical problems:

a multi-wavelength Brillouin fiber laser is characterized by comprising a narrow linewidth adjustable laser (1), a first fiber coupler (2), a first optical amplifier (3), a four-port optical circulator (4), a first Brillouin fiber (5), a three-port optical circulator (6), a second Brillouin fiber (7), a second optical amplifier (8) and a second fiber coupler (9).

The multi-wavelength Brillouin optical fiber laser is characterized in that the output end of a narrow linewidth adjustable laser (1) is connected with an A1 port at the A end of a four-port optical fiber coupler (2), a B1 port at the B end of the four-port optical fiber coupler is connected with the input end of a first optical amplifier (3), a 41 port of a four-port optical circulator (4) is connected with the output end of the first optical amplifier, a 42 port of the four-port optical circulator (4) is connected with one end of a first Brillouin optical fiber (5), a 62 port of a three-port optical circulator (6) is connected with the other end of the first Brillouin optical fiber (5), a 61 port and a 63 port of the three-port optical circulator (6) are connected, a 43 port of the four-port optical circulator (4) is connected with one end of a second Brillouin optical fiber (7), and the other end of the second Brillouin optical fiber (7) is connected with one end of a second optical amplifier (8), the 44 port of the four-port optical circulator (4) is connected with the D1 port of the D end of the second optical fiber coupler (9), the C1 port of the C end of the second optical fiber coupler is connected with the other end of the second optical amplifier, the D2 port of the D end of the second optical fiber coupler is connected with the A2 port of the A end of the first optical fiber coupler, the B2 port of the B end of the first optical fiber coupler is the laser output port of the multi-wavelength Brillouin optical fiber laser, and the laser output port can be connected to an optical spectrum analyzer.

The multi-wavelength Brillouin optical fiber laser is characterized in that laser output by a narrow-linewidth adjustable laser is used as Brillouin pump light (BP), the BP enters a first optical amplifier (3) through a port B1 of a first optical fiber coupler (2) to be amplified, the amplified BP is injected into one end of a first Brillouin gain optical fiber (5) through a port 42 of a four-port optical fiber circulator (4) and generates Brillouin scattering with the one end, when the power of the BP exceeds the stimulated Brillouin threshold value of the first Brillouin optical fiber, first-order Stokes light (BS1) with the frequency shift value transmitted in the reverse direction of the BP is generated, a three-port optical circulator (6) is used as an optical fiber reflector and reflects residual forward BP back to the first Brillouin optical fiber to enhance the power of BS1, the BS1 is injected into one end of a second Brillouin optical fiber (7) through a port 43 of the four-port optical circulator (4) and generates Brillouin scattering with the one end, when the power of the BS1 is enough, second-order Stokes light (BS2) with the frequency shifted by the Brillouin frequency shift value is excited in the second Brillouin optical fiber, the BS2 is output from a 44 port of the four-port optical fiber circulator (4), enters the second optical amplifier (8) through the second optical fiber coupler (9) to be amplified, the amplified BS2 is injected into the other end of the second Brillouin optical fiber (7) and generates Brillouin scattering with the other end of the second Brillouin optical fiber, when the power of the BS2 exceeds the stimulated Brillouin threshold value of the second Brillouin optical fiber, third-order Stokes light (BS3) with the frequency shifted by the Brillouin frequency shift value is generated, the BS3 is amplified by the second optical amplifier, one part of the BS3 enters the first optical amplifier through a C1-D2-A2-B1 to be amplified as the Brillouin pumping light output from a first optical fiber 3 which is output by the first optical fiber 2, due to the power gain functions of the first optical amplifier and the second optical amplifier, on one hand, power loss in an optical path is compensated, on the other hand, Stokes light is amplified, stimulated Brillouin scattering processes in the first Brillouin optical fiber and the second Brillouin optical fiber can occur in a cascade mode, and therefore multi-wavelength Brillouin laser with triple Brillouin frequency shift value wavelength intervals can be observed by a spectrum analyzer at a port B2 of the first optical fiber coupler.

The multi-wavelength Brillouin fiber laser is characterized in that the first Brillouin fiber and the second Brillouin fiber are single-mode quartz fibers with the same Brillouin frequency shift value.

The multi-wavelength Brillouin fiber laser is characterized in that the first optical amplifier and the second optical amplifier are both self-made erbium-doped fiber amplifiers, wherein the second optical amplifier is also required to be capable of realizing bidirectional amplification design.

Drawings

Fig. 1 is a schematic diagram of a multi-wavelength brillouin fiber laser device.

The reference numerals in fig. 1 are interpreted as: 1-narrow linewidth tunable laser, 2-first optical fiber coupler, 3-first optical amplifier, 4-four-port optical circulator, 5-first Brillouin optical fiber, 6-three-port optical circulator, 7-second Brillouin optical fiber, 8-second optical amplifier, 9-second optical fiber coupler, A1-first port of A end of first optical fiber coupler, A2-second port of A end of first optical fiber coupler, B1-first port of B end of first optical fiber coupler, B2-second port of B end of first optical fiber coupler, C1-first port of C end of second optical fiber coupler, D1-first port of D end of second optical fiber coupler, D2-second port of D end of second optical fiber coupler, 41-first port of four-port optical circulator, 42-the second port of the four-port optical circulator, 43-the third port of the four-port optical circulator, 44-the fourth port of the four-port optical circulator, 61-the first port of the three-port optical circulator, 62-the second port of the three-port optical circulator, 63-the third port of the three-port optical circulator.

Fig. 2 is an output spectrum of a multi-wavelength brillouin fiber laser.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

A multi-wavelength Brillouin fiber laser is characterized by comprising a narrow linewidth adjustable laser (1), a first fiber coupler (2), a first optical amplifier (3), a four-port optical circulator (4), a first Brillouin fiber (5), a three-port optical circulator (6), a second Brillouin fiber (7), a second optical amplifier (8) and a second fiber coupler (9).

The method is characterized in that the output end of a narrow linewidth adjustable laser (1) is connected with an A1 port at the A end of a four-port optical fiber coupler (2), a B1 port at the B end of the four-port optical fiber coupler is connected with the input end of a first optical amplifier (3), a 41 port of a four-port optical circulator (4) is connected with the output end of the first optical amplifier, a 42 port of the four-port optical circulator (4) is connected with one end of a first Brillouin optical fiber (5), a 62 port of a three-port optical circulator (6) is connected with the other end of the first Brillouin optical fiber (5), a 61 port and a 63 port of the three-port optical circulator (6) are connected, a 43 port of the four-port optical circulator (4) is connected with one end of a second Brillouin optical fiber (7), the other end of the second Brillouin optical fiber (7) is connected with one end of a second optical amplifier (8), a 44 port of the four-port optical circulator (4) is connected with a D1 port of a second optical fiber coupler (9), the port C1 of the end C of the second optical fiber coupler is connected with the other end of the second optical amplifier, the port D2 of the end D of the second optical fiber coupler is connected with the port A2 of the end A of the first optical fiber coupler, the port B2 of the end B of the first optical fiber coupler is a laser output port of the multi-wavelength Brillouin optical fiber laser, and the laser output port can be connected to an optical spectrum analyzer.

The multi-wavelength Brillouin optical fiber laser is characterized in that laser output by a narrow-linewidth adjustable laser is used as Brillouin pump light (BP), the BP enters a first optical amplifier (3) through a port B1 of a first optical fiber coupler (2) to be amplified, the amplified BP is injected into one end of a first Brillouin gain optical fiber (5) through a port 42 of a four-port optical fiber circulator (4) and generates Brillouin scattering with the one end, when the power of the BP exceeds the stimulated Brillouin threshold value of the first Brillouin optical fiber, first-order Stokes light (BS1) with the frequency shift value transmitted in the reverse direction of the BP is generated, a three-port optical circulator (6) is used as an optical fiber reflector and reflects residual forward BP back to the first Brillouin optical fiber to enhance the power of BS1, the BS1 is injected into one end of a second Brillouin optical fiber (7) through a port 43 of the four-port optical circulator (4) and generates Brillouin scattering with the one end, when the power of the BS1 is enough, second-order Stokes light (BS2) with the frequency shifted by the Brillouin frequency shift value is excited in the second Brillouin optical fiber, the BS2 is output from a 44 port of the four-port optical fiber circulator (4), enters the second optical amplifier (8) through the second optical fiber coupler (9) to be amplified, the amplified BS2 is injected into the other end of the second Brillouin optical fiber (7) and generates Brillouin scattering with the other end of the second Brillouin optical fiber, when the power of the BS2 exceeds the stimulated Brillouin threshold value of the second Brillouin optical fiber, third-order Stokes light (BS3) with the frequency shifted by the Brillouin frequency shift value is generated, the BS3 is amplified by the second optical amplifier, one part of the BS3 enters the first optical amplifier through a C1-D2-A2-B1 to be amplified as the Brillouin pumping light output from a first optical fiber 3 which is output by the first optical fiber 2, due to the power gain functions of the first optical amplifier and the second optical amplifier, on one hand, power loss in an optical path is compensated, on the other hand, Stokes light is amplified, stimulated Brillouin scattering processes in the first Brillouin optical fiber and the second Brillouin optical fiber can occur in a cascade mode, and therefore multi-wavelength Brillouin laser with triple Brillouin frequency shift value wavelength intervals can be observed by a spectrum analyzer at a port B2 of the first optical fiber coupler.

The narrow linewidth adjustable laser is characterized in that: the line width is lower than 1MHz, the output wavelength and power can be continuously tuned, the wavelength range is C + L wave band, and the power is 15 mW.

The first optical amplifier and the second optical amplifier are self-made erbium-doped optical fiber amplifiers, the second optical amplifier is in a bidirectional amplification design, the two optical amplifiers are respectively provided with a 980nm pump laser, a 1550nm/980nm wavelength division multiplexer and a section of 6m long erbium-doped optical fiber, and the maximum output power of the 980nm pump laser is 400 mW.

Fig. 2 shows the output of the multi-wavelength brillouin fiber laser, which is measured under the conditions that the output power of the narrow-linewidth tunable laser is 2.5mw, the wavelength is 1530.33nm, the output power of 980nm in the first optical amplifier is 284mw, the output power of 980nm in the second optical amplifier is 380mw, the lengths of the first brillouin fiber and the second brillouin fiber are both 20km, the brillouin frequency shift values are both 10.85GHz, the four-port optical circulator and the three-port optical circulator are both single-mode silica fiber optical circulators, and the first fiber coupler and the second fiber coupler are both 3dB single-mode silica fiber couplers.

While the operation of the present invention has been described in detail, it will be apparent to those skilled in the art that variations in the specific embodiments, such as the type of fiber amplifier, the location of the fiber amplifier, other schemes having the same effect as a three-port fiber circulator, etc., are possible according to the concept provided by the present invention, and such variations should be considered as within the scope of the present invention.