CN220341675U - High polarization ratio optical fiber coupled laser capable of monitoring power - Google Patents
High polarization ratio optical fiber coupled laser capable of monitoring power Download PDFInfo
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- CN220341675U CN220341675U CN202223486561.6U CN202223486561U CN220341675U CN 220341675 U CN220341675 U CN 220341675U CN 202223486561 U CN202223486561 U CN 202223486561U CN 220341675 U CN220341675 U CN 220341675U
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- 230000010287 polarization Effects 0.000 title claims abstract description 50
- 239000013307 optical fiber Substances 0.000 title claims abstract description 32
- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 claims abstract description 24
- 239000013078 crystal Substances 0.000 claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims description 13
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The utility model provides a high polarization ratio optical fiber coupling laser capable of monitoring power, which comprises a laser diode, a lens system, a birefringent crystal, a double polarization maintaining optical fiber head and a PD, wherein the lens system is arranged at the output end of the laser diode, the birefringent crystal is arranged in the lens system, and the double polarization maintaining optical fiber head is arranged at the output end of the lens system; the double refraction crystal divides the light beam emitted by the laser diode into two polarized lights which are parallel and have mutually perpendicular polarization directions; the PD is connected with the double polarization maintaining fiber head; the high polarization ratio fiber coupled laser capable of monitoring power provided by the utility model can not only improve the polarization ratio of the laser, but also realize split power monitoring.
Description
Technical Field
The utility model relates to an optical fiber coupled laser, in particular to an optical fiber coupled laser with high polarization ratio and capable of monitoring power.
Background
At present, an ACC mode is generally adopted for driving an optical fiber coupling laser in a visible light wave band, the output power is not monitored, and poor long-term working stability is caused, and the causes include the following: 1. the output power of the laser diode is unstable; 2. the divergence angle of the light beam of the output facula of the laser diode is unstable; 3. the coupling system of the optical fiber coupling laser is unstable; 4. or the PD is integrated at the output end to form APC closed loop power control, but the structure of the output end is complex and the volume can not be reduced, the PD wire and the output optical fiber also need additional protection, and the cost is high.
Disclosure of Invention
In view of the above, the utility model provides a high polarization ratio fiber coupled laser capable of monitoring power, which can not only improve the polarization ratio of the laser, but also realize split power monitoring.
The utility model provides a high polarization ratio optical fiber coupling laser capable of monitoring power, which comprises a laser diode, a lens system, a birefringent crystal, a double polarization maintaining optical fiber head and a PD, wherein the lens system is arranged at the output end of the laser diode, the birefringent crystal is arranged in the lens system, and the double polarization maintaining optical fiber head is arranged at the output end of the lens system; the double refraction crystal divides the light beam emitted by the laser diode into two polarized lights which are parallel and have mutually perpendicular polarization directions; the PD is connected with the double polarization maintaining fiber head.
Further, the dual polarization maintaining fiber optical fiber head comprises a dual fiber capillary and two polarization maintaining fibers arranged in the capillary.
Further, the PD is connected with one of the bias-preserving optical fibers.
Further, the laser diode is an LD laser diode of a visible light band.
Further, the lens system comprises a coupling optical unit and a focusing lens, wherein the focusing lens is positioned at the output end of the coupling optical unit, and the birefringent crystal is arranged between the coupling optical unit and the focusing lens.
Further, the coupling optical unit comprises a shaping unit and a collimating unit.
According to the high-polarization-ratio fiber coupled laser capable of monitoring power, provided by the utility model, the polarization ratio of the laser is obviously improved by introducing the birefringent crystal, so that the test precision is improved; the driving of the traditional ACC mode is overcome, the APC driving mode is realized, and the long-term working power stability of the laser is ensured; and under the condition that the appearance of the optical fiber coupling part is consistent with that of the original optical fiber coupling part, the output end does not need to be integrated with the PD, the output end can realize compact volume, and in addition, the output optical fiber does not need to be additionally protected.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic structural diagram of a high polarization ratio fiber coupled laser capable of monitoring power according to an embodiment of the present utility model.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Embodiment one:
referring to fig. 1, a high polarization ratio fiber coupled laser capable of monitoring power according to a first embodiment of the present utility model is shown, which includes a laser diode 1, a lens system 2, a birefringent crystal 3, a dual polarization maintaining fiber head 4 and a PD, the lens system is disposed at an output end of the laser diode 1, the birefringent crystal 3 is disposed in the lens system, and the dual polarization maintaining fiber head 4 is disposed at an output end of the lens system; the birefringent crystal 3 divides the light beam emitted by the laser diode 1 into two polarized lights which are parallel and have mutually perpendicular polarization directions; the PD is connected with the double polarization maintaining fiber head 4.
Wherein the double polarization maintaining fiber optical fiber head 4 comprises a double fiber capillary and two polarization maintaining fibers 41 arranged in the capillary; the PD is connected to one of the polarization maintaining fibers 41.
The high polarization ratio optical fiber coupling laser capable of monitoring power provided by the embodiment, the light beam output by the laser diode 1 is subjected to the functions of spot shaping, collimation and focusing of the lens system 2, and then passes through the birefringent crystal 3, and the birefringent effect of the birefringent crystal 3 is divided into two polarized light o light and e light which are parallel and have the polarization directions perpendicular to each other, so that the o light is coupled into one polarization maintaining optical fiber of the birefringent optical fiber head 4 to serve as the output end of the laser through optical coupling adjustment, the output of the high polarization ratio laser is realized, and the e light is coupled into the other polarization maintaining optical fiber of the birefringent optical fiber head 4, and the optical fiber is connected with the PD to realize power monitoring; in general, by introducing the birefringent crystal 3, the polarization ratio of the laser is remarkably improved, thereby improving the test accuracy; the driving of the traditional ACC mode is overcome, the APC driving mode is realized, and the long-term working power stability of the laser is ensured; and under the condition that the appearance of the optical fiber coupling part is consistent with that of the original optical fiber coupling part, the output end does not need to be integrated with the PD, the output end can realize compact volume, and in addition, the output optical fiber does not need to be additionally protected.
Embodiment two:
referring to fig. 1, a high polarization ratio fiber coupled laser capable of monitoring power according to a second embodiment of the present utility model is shown in the drawing, and the present embodiment further makes the following technical solutions as improvements based on the foregoing embodiments: the laser diode 1 is an LD laser diode of the visible light band.
By the further improvement, the embodiment has the following advantages compared with the prior art: the semiconductor laser diode is adopted, so that the power of emitted light is larger, and the output effect and the testing precision of the laser are improved.
Embodiment III:
referring to fig. 1, a high polarization ratio fiber coupled laser capable of monitoring power according to a third embodiment of the present utility model is shown in the drawing, and the present embodiment further makes the following technical solutions as improvements based on the foregoing embodiments: the lens system 2 includes a coupling optical unit 21 and a focusing lens 22, the focusing lens 22 being located at an output end of the coupling optical unit 21, the birefringent crystal 3 being disposed between the coupling optical unit 21 and the focusing lens 22; the coupling optical unit 21 includes a shaping unit and a collimating unit.
By the further improvement, the embodiment has the following advantages compared with the prior art: the emitted light can be shaped, collimated and focused to obtain polarized light, and the output efficiency of the lens system is further improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The high polarization ratio optical fiber coupling laser capable of monitoring power is characterized by comprising a laser diode (1), a lens system (2), a birefringent crystal (3), a double polarization maintaining optical fiber head (4) and a PD, wherein the lens system is arranged at the output end of the laser diode (1), the birefringent crystal (3) is arranged in the lens system, and the double polarization maintaining optical fiber head (4) is arranged at the output end of the lens system; the birefringent crystal (3) divides the light beam emitted by the laser diode (1) into two polarized lights which are parallel and have mutually perpendicular polarization directions; the PD is connected with the double polarization maintaining fiber head (4).
2. A high polarization ratio fiber coupled laser capable of monitoring power according to claim 1, characterized in that the dual polarization maintaining fiber optical fiber head (4) comprises a dual fiber capillary and two polarization maintaining fibers (41) arranged in the capillary.
3. A high polarization ratio fiber coupled laser capable of monitoring power according to claim 2, wherein the PD is connected to one of the polarization maintaining fibers (41).
4. A high polarization ratio fiber coupled laser capable of monitoring power according to claim 3, characterized in that the laser diode (1) is an LD laser diode of the visible light band.
5. The high polarization ratio fiber coupled laser of claim 4, wherein the lens system (2) comprises a coupling optical unit (21) and a focusing lens (22), the focusing lens (22) is located at the output end of the coupling optical unit (21), and the birefringent crystal (3) is disposed between the coupling optical unit (21) and the focusing lens (22).
6. A high polarization ratio fiber coupled laser with power monitoring according to claim 5, characterized in that the coupling optical unit (21) comprises a shaping unit and a collimating unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223486561.6U CN220341675U (en) | 2022-12-23 | 2022-12-23 | High polarization ratio optical fiber coupled laser capable of monitoring power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223486561.6U CN220341675U (en) | 2022-12-23 | 2022-12-23 | High polarization ratio optical fiber coupled laser capable of monitoring power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220341675U true CN220341675U (en) | 2024-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223486561.6U Active CN220341675U (en) | 2022-12-23 | 2022-12-23 | High polarization ratio optical fiber coupled laser capable of monitoring power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220341675U (en) |
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2022
- 2022-12-23 CN CN202223486561.6U patent/CN220341675U/en active Active
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