CN210608006U - Wavelength-switchable single-wavelength fiber laser - Google Patents
Wavelength-switchable single-wavelength fiber laser Download PDFInfo
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- CN210608006U CN210608006U CN201921974246.3U CN201921974246U CN210608006U CN 210608006 U CN210608006 U CN 210608006U CN 201921974246 U CN201921974246 U CN 201921974246U CN 210608006 U CN210608006 U CN 210608006U
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Abstract
The utility model discloses a changeable single wavelength fiber laser of wavelength, include: a laser for generating a pump light source; the a end of the wavelength division multiplexer is connected to the output end of the laser; one end of the gain optical fiber is connected to the b end of the wavelength division multiplexer; the input end of the first optical isolator is connected to the other end of the gain optical fiber; the d end of the optical splitter is connected to the output end of the first optical isolator, the optical splitter is used for distributing the energy of the input signal and the energy of the output signal, and the e end of the optical splitter is used as a laser output interface; and the MEMS optical switch is provided with a plurality of input ends, the input ends of the MEMS optical switch are connected with the FBG Bragg fiber gratings with different wavelengths, and the common end of the MEMS optical switch is connected to the f end of the optical splitter and used for MEMS channel switching to switch the wavelengths. The utility model discloses take full fiber structure, do the switching that pumping source and MEMS photoswitch realized different wavelengths through a semiconductor laser, satisfied the demand to the different wavelengths of fiber laser.
Description
Technical Field
The utility model relates to a fiber laser field, concretely relates to changeable single wavelength fiber laser of wavelength.
Background
The currently common single-wavelength light source is mainly a DFB semiconductor narrow linewidth laser, and the technology is mature and commonly used by virtue of the characteristics of narrow linewidth, stable performance, excellent spectrum shape and the like. However, the disadvantage is that only one specific wavelength can be output, and if multiple wavelengths are required, special customization is required, which increases cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a changeable single wavelength fiber laser of wavelength.
The technical scheme of the utility model as follows:
a wavelength switchable single wavelength fiber laser comprising:
a laser for generating a pump light source;
the a end of the wavelength division multiplexer is connected to the output end of the laser;
one end of the gain optical fiber is connected to the b end of the wavelength division multiplexer and used for generating gain laser under the action of the pump laser;
the input end of the first optical isolator is connected to the other end of the gain optical fiber and used for ensuring the one-way propagation of light waves and avoiding the damage of the laser caused by optical feedback;
the d end of the optical splitter is connected to the output end of the first optical isolator, the optical splitter is used for distributing the energy of the input signal and the energy of the output signal, and the e end of the optical splitter is used as a laser output interface;
and the MEMS optical switch is provided with a plurality of input ends, the input ends of the MEMS optical switch are connected with the FBG Bragg fiber gratings with different wavelengths, and the common end of the MEMS optical switch is connected to the f end of the optical splitter and used for MEMS channel switching to switch the wavelengths.
In the above scheme, the method further comprises:
and the second optical isolator is connected between the g end of the optical splitter and the c end of the wavelength division multiplexer, the input end of the second optical isolator is connected to the g end of the optical splitter, and the output end of the second optical isolator is connected to the c end of the wavelength division multiplexer, and is used for ensuring the unidirectional propagation of the light wave in the optical path so as to form a unidirectional ring cavity structure.
In the above scheme, the laser is a semiconductor laser.
In the above scheme, the gain fiber is a doped fiber.
In the above scheme, the gain fiber is an erbium-doped fiber.
In the above scheme, the optical splitting coupler is an equal splitting coupler.
In the above scheme, the optical splitting coupler is a 2 × 2 equalizing coupler.
In the above scheme, the e end of the optical splitting coupler is used as a laser output interface by connecting a jumper wire.
In the above scheme, an output isolator is arranged at the output interface of the laser.
In the above scheme, the connection between the f-end of the optical splitter and the common end of the MEMS optical switch, and the connection between the input end of the MEMS optical switch and the FBG bragg fiber grating are all welded.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the utility model is mainly used for testing special wave bands, breaks through the constraint of wavelength, and utilizes the wavelength flexibility of FBG to convert the wavelength flexibility into the wavelength flexibility of light source;
2. the utility model discloses not only be limited to C wave band working range, change doping optic fibre and work pumping, but also can produce the continuous changeable light source of single wavelength in the 1um wave band scope.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a block diagram illustrating a wavelength switchable single-wavelength fiber laser according to the present invention;
fig. 2 is an output spectrum diagram of a wavelength switchable single-wavelength fiber laser provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Examples
The utility model relates to a fiber laser field, when needing a plurality of wavelengths to traditional fiber laser, then need additionally purchase special customization, cause the higher problem of cost, provide a changeable single wavelength fiber laser of wavelength, it can be used to optical communication, the test of light passive device, the light sensing experiment, EDFA signal input experiment.
As shown in fig. 1, the wavelength switchable single-wavelength fiber laser provided in this embodiment includes a laser 1, a wavelength division multiplexer 2, a gain fiber 3, a first optical isolator 4, a beam splitter coupler 5, a second optical isolator 6, and an MEMS optical switch 7, and the connection relationship and principle between the two are specifically described below:
a laser 1 for generating a pump light source. In this embodiment, the laser is a semiconductor laser.
The wavelength division multiplexer 2 is provided with an end a, an end b and an end c, wherein the end a is connected to the output end of the laser 1, and the function of the wavelength division multiplexer is to combine a series of optical signals which carry information and have different wavelengths into a bundle and transmit the bundle along a single optical fiber.
And one end of the gain fiber 3 is connected to the b end of the wavelength division multiplexer 2 and is used for generating gain laser under the action of pump laser, the gain fiber 3 is a doped fiber, and the doped fiber is a fiber which is doped with impurities and points to the fiber core of the fiber, so that the fiber is modified, and an optical effect is generated. The pumping light emitted by the semiconductor laser enters the doped optical fiber after passing through the wavelength division multiplexer 2, the wavelength of the pumping light source must be matched with the atoms of the working substance of the doped optical fiber, namely the energy of one pumping photon is exactly equal to the working condition of stimulated absorption of the atoms of the working substance of the doped optical fiber, and the working wave bands of other optical devices are also within the range of the wave band of spontaneous radiation transition of the doped working substance. This is the basic condition for a fiber laser to work properly. In this embodiment, the gain fiber 3 is an erbium-doped fiber, and based on the amplification characteristics of the erbium-doped fiber, only the wavelength within the spontaneous emission bandwidth of erbium atoms can be output, and for other wavelengths, the working substance and the doped fiber need to be changed, and the same principle can be used.
And the input end of the first optical isolator 4 is connected to the other end of the gain fiber 3 and is used for ensuring the unidirectional propagation of light waves and avoiding the damage of the laser caused by optical feedback.
And the optical splitting coupler 5 is provided with a d terminal, an e terminal, an f terminal and a g terminal, wherein the d terminal is connected to the output terminal of the first optical isolator 4 and used for distributing the energy of the input signal and the energy of the output signal, and the e terminal is used as a laser output interface. In this embodiment, the splitting coupler 5 is a 2 × 2 equalizing coupler, but the splitting ratio of the splitting coupler 5 may be other ratios such as 40/60 instead of being equalized. The e end of the optical splitting coupler 5 can be used as a laser output interface by connecting a jumper, and an output isolator can be added at the laser output interface to place end face return light.
And the second optical isolator 6 is connected between the g end of the optical splitter 5 and the c end of the wavelength division multiplexer 2, the input end of the second optical isolator is connected to the g end of the optical splitter 5, and the output end of the second optical isolator is connected to the c end of the wavelength division multiplexer 2, and is used for ensuring the unidirectional propagation of light waves in an optical path so as to form a unidirectional ring cavity structure.
And the MEMS optical switch 7 is provided with a plurality of input ends, the input ends of the MEMS optical switch are connected with FBG fiber Bragg gratings with different wavelengths, and the common end of the MEMS optical switch is connected to the f end of the optical splitter coupler 5 for MEMS channel switching to switch the wavelengths. The connection between the f end of the optical splitter 5 and the common end of the MEMS optical switch 7, and the connection between the input end of the MEMS optical switch 7 and the FBG bragg fiber grating are all welded. The FBG must have a reflection wavelength within the range of the doped fiber amplification. The other end of the FBG is treated in a small winding. For example, if ten FBGs are used and the corresponding wavelengths are λ 1 to λ 10, an optical switch of 1 × 10 is used. The working mode of the MEMS optical switch only allows one channel to work at a certain moment, and other channels are all disconnected, so that according to the working principle, a digital optical switch channel switching device is equipped, and which channel of FBG needs to be switched as long as the channel corresponding to the FBG is switched. The device can be integrated in a small case, and is convenient to carry and transport. The final output spectral shape is shown in fig. 2. It can be seen that the spectral shape is good and the SMSR is superior.
To sum up, the utility model provides a wavelength switchable single-wavelength fiber laser adopts the all-fiber structure, uses a semiconductor laser as the pumping source and a MEMS photoswitch is used for switching the wavelength, can be used for the test of special wave band, has broken through the constraint of wavelength, utilizes the wavelength flexibility of FBG, converts into the wavelength flexibility of light source; just the utility model discloses not only be limited to C wave band working range, change and mix optic fibre and work pumping, can also produce the continuous changeable light source of single wavelength in the 1um wave band scope.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A wavelength switchable single wavelength fiber laser comprising:
a laser for generating a pump light source;
the a end of the wavelength division multiplexer is connected to the output end of the laser;
one end of the gain optical fiber is connected to the b end of the wavelength division multiplexer and used for generating gain laser under the action of the pump laser;
the input end of the first optical isolator is connected to the other end of the gain optical fiber and used for ensuring the one-way propagation of light waves and avoiding the damage of the laser caused by optical feedback;
the d end of the optical splitter is connected to the output end of the first optical isolator, the optical splitter is used for distributing the energy of the input signal and the energy of the output signal, and the e end of the optical splitter is used as a laser output interface;
and the MEMS optical switch is provided with a plurality of input ends, the input ends of the MEMS optical switch are connected with the FBG Bragg fiber gratings with different wavelengths, and the common end of the MEMS optical switch is connected to the f end of the optical splitter and used for MEMS channel switching to switch the wavelengths.
2. A wavelength switchable single wavelength fiber laser as claimed in claim 1, further comprising:
and the second optical isolator is connected between the g end of the optical splitter and the c end of the wavelength division multiplexer, the input end of the second optical isolator is connected to the g end of the optical splitter, and the output end of the second optical isolator is connected to the c end of the wavelength division multiplexer, and is used for ensuring the unidirectional propagation of the light wave in the optical path so as to form a unidirectional ring cavity structure.
3. A wavelength switchable single wavelength fiber laser as claimed in claim 1, wherein the laser is a semiconductor laser.
4. A wavelength switchable single wavelength fiber laser as claimed in claim 1, wherein the gain fiber is a doped fiber.
5. A wavelength switchable single wavelength fiber laser as claimed in claim 4, wherein the gain fiber is an erbium doped fiber.
6. A wavelength switchable single wavelength fiber laser as claimed in claim 1, wherein the splitting coupler is a homodyne coupler.
7. A wavelength switchable single wavelength fiber laser as claimed in claim 6, wherein the splitting coupler is a 2 x 2 homogenizing coupler.
8. The wavelength switchable single wavelength fiber laser of claim 1, wherein an e-port of the optical splitting coupler is used as a laser output interface by connecting a jumper wire.
9. A wavelength switchable single wavelength fiber laser as claimed in claim 1 or 8, wherein an output isolator is provided at the laser output interface.
10. A wavelength switchable single wavelength fiber laser as claimed in claim 1, wherein the connection between the f-port of the optical splitter and the common port of the MEMS optical switch, and the connection between the input port of the MEMS optical switch and the FBG bragg fiber grating are all welded together.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921974246.3U CN210608006U (en) | 2019-11-13 | 2019-11-13 | Wavelength-switchable single-wavelength fiber laser |
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| CN201921974246.3U CN210608006U (en) | 2019-11-13 | 2019-11-13 | Wavelength-switchable single-wavelength fiber laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671509A (en) * | 2021-08-16 | 2021-11-19 | 南京牧镭激光科技有限公司 | Large-energy multichannel laser radar beam switching method |
| CN115967002A (en) * | 2022-11-25 | 2023-04-14 | 山东省科学院激光研究所 | Multi-channel fast selection and tunable single-frequency fiber laser and use method |
-
2019
- 2019-11-13 CN CN201921974246.3U patent/CN210608006U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671509A (en) * | 2021-08-16 | 2021-11-19 | 南京牧镭激光科技有限公司 | Large-energy multichannel laser radar beam switching method |
| CN113671509B (en) * | 2021-08-16 | 2023-07-11 | 南京牧镭激光科技股份有限公司 | High-energy multichannel laser radar beam switching method |
| CN115967002A (en) * | 2022-11-25 | 2023-04-14 | 山东省科学院激光研究所 | Multi-channel fast selection and tunable single-frequency fiber laser and use method |
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