CN117631403A - Multi-path pumping optical system and optical network device - Google Patents
Multi-path pumping optical system and optical network device Download PDFInfo
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- CN117631403A CN117631403A CN202311621218.4A CN202311621218A CN117631403A CN 117631403 A CN117631403 A CN 117631403A CN 202311621218 A CN202311621218 A CN 202311621218A CN 117631403 A CN117631403 A CN 117631403A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 62
- 238000005086 pumping Methods 0.000 title claims abstract description 18
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 5
- 230000005283 ground state Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- -1 neodymium yttrium aluminum Chemical compound 0.000 claims description 3
- 239000005365 phosphate glass Substances 0.000 claims description 3
- 239000005368 silicate glass Substances 0.000 claims description 3
- 229910019655 synthetic inorganic crystalline material Inorganic materials 0.000 claims description 3
- 229910019901 yttrium aluminum garnet Inorganic materials 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a multi-path pumping optical system and an optical network device, wherein the multi-path pumping optical system comprises a reflecting lens group, a ball lens, an optical gain amplifying module and a reflecting mirror which are sequentially arranged along an optical axis; the reflecting lens groups are symmetrically arranged about the center of the reflecting mirror; the light is emitted in the same angle after entering the reflecting lens group; when the optical gain amplifying module works, light is shot into the optical gain amplifying module through the input port of the reflecting lens group, focused by the ball lens, reflected back through the reflecting mirror, then horizontally shot into the reflecting lens group through the ball lens, reflected again through the reflecting lens group, shot onto the optical gain amplifying module through the ball lens, and shot out from the output port of the reflecting lens group after multiple round trips. In the invention, the light can be emitted in the same angle after entering the reflecting lens, thereby avoiding the influence of the installation angle of the reflecting lens on the light path and improving the stability of the system.
Description
Technical Field
The invention belongs to the field of optical fiber communication, and particularly relates to a multi-path pumping optical system and an optical network device.
Background
With the rapid development of the optical communication industry, the optical network traffic increases year by year. This presents new challenges for the load and long-distance transmission capabilities of optical networks. The transmission quality of the system is seriously affected by the reduction of optical power caused by absorption, scattering and other reasons in long-distance optical fiber transmission. This requires an amplification compensation of the lost light during transmission.
The conventional optical amplification technology uses erbium-doped fiber as an amplifier. The erbium-doped fiber amplifier has the advantages of high gain, low noise, polarization independence and the like, and is widely used in long-distance and large-capacity fiber communication systems. However, the optical fiber fusion connection method has the problems of large insertion loss, complex structure, low reliability and the like, and is not suitable for a free space optical system.
The existing free space optical amplification technology uses a disc multi-pass structure, the disc crystal is usually a gain substance activated by a pumping source, and a plurality of reflectors are used for enabling signal light to pass through the disc crystal repeatedly in a cavity, so that gain amplification of the signal light is realized. The structure has the advantages of high gain, low noise and the like, but has complex structure and high assembly difficulty.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a multi-pass pump optical system and an optical network device, and aims to solve the problems of complex structure and high processing and installation difficulty in a multi-pass round trip structure in the prior art.
The invention provides a multi-pass pump optical system, comprising: the optical system comprises a reflecting lens group, a ball lens, an optical gain amplifying module and a reflecting mirror which are sequentially arranged along an optical axis; the reflecting lens groups are symmetrically arranged about the center of the reflecting mirror; the light is emitted in the same angle after entering the reflecting lens group; when the optical gain amplifying module works, light is shot in from an input port of the reflecting lens group, focused by the ball lens, shot on the optical gain amplifying module, reflected by the reflecting mirror, shot into the reflecting lens group horizontally by the ball lens, reflected again by the reflecting lens group, shot on the optical gain amplifying module by the ball lens, and shot out from an output port of the reflecting lens group after a plurality of round trips.
Further, the number of ports of the reflection lens group is 2 n ×2 m； The reflecting lens group comprises a plurality of identical reflecting lenses, the output port of each reflecting lens and the input port of the next reflecting lens are symmetrical about the center of the reflecting lens group, and two empty ports are reserved as input and output ports of signal light, wherein n and m are positive integers.
Further, the reflecting lens is a square ball lens, the front surface of the reflecting lens is a spherical surface, the rear surface of the reflecting lens is a plane plated with a reflecting film, and the aspect ratio of the cross section of the reflecting lens is 2.
Still further, the optical gain amplification module includes: the pump source, WDM filter plate and gain medium disc; the pump source is used for generating pump light for exciting the gain medium; the WDM filter is used for reflecting the pump light to the gain medium disc without influencing the reciprocating of the signal light; the gain medium disc is used for receiving the pumping light and then enabling particles to transition from a ground state to a high energy level, so that the inversion of the particle number is realized; when the signal light is irradiated to the gain medium disc, stimulated radiation is generated, electrons with high energy level migrate to low energy level and emit photons with the same frequency as the signal light, so that the signal light is amplified.
The pump source and the gain medium disc can be determined according to the wavelength of the signal light.
Further preferably, when the wavelength of the signal light is 1064nm, the pumping source may be an LD light source with a wavelength of 808nm, and the gain medium disc is a neodymium yttrium aluminum garnet (Nd: YAG) single crystal. When the wavelength of the signal light is 1550nm, the pumping source is a laser diode LD light source with the wavelength of 976nm, and the gain medium disk is Er 3+ /Yb 3+ Double doped phosphate glass. When the wavelength of the signal light is 1950nm, the pump source selects LD light source with wavelength of 1570nm, and the gain medium disk is Tm doped 3+ Silicate glass.
Still further, the WDM filter is placed at a 45 ° tilt angle.
The invention also provides an optical network device, which comprises a multi-pass pump optical system, wherein the multi-pass pump optical system is the multi-pass pump optical system.
Compared with the prior art, the technical scheme of the invention has the advantages that the system stability can be effectively improved and the cost can be reduced because the angle of the input light of the adopted reflecting lens is consistent with that of the reflected light, the reflecting lens group structure is used for replacing a plurality of reflecting mirror structures, the volume can be effectively reduced, the installation difficulty is reduced, and smaller loss is obtained.
Drawings
FIG. 1 is a schematic diagram of a multi-pass pump optical system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a reflective lens structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a reflective lens assembly according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a reflective lens group port according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a multi-pass pump optical system, comprising: the system comprises a reflecting lens group, a ball lens, a pumping source, a WDM filter, a gain medium disc and a reflecting mirror;
the reflecting lens group is formed by combining a plurality of identical reflecting lenses, the reflecting lenses are square ball lenses, and the aspect ratio of the cross section of the reflecting lenses is 2. Light is emitted in the same angle after entering the reflecting lens, so that the stability of the light path is improved, and the incident point and the emergent point are two ports of the reflecting lens. The plurality of reflecting lenses form a reflecting lens group, and the number of ports is generally 4×4 or 8×8. Two empty ports are used as light input port and light output port in the system.
The combination of the reflective lens group and the mirror enables multiple round trips of light in the system. Light enters the reflecting lens group from the input port of the reflecting lens group, is focused by the ball lens and then is transmitted to the gain medium disc, then is reflected by the reflecting mirror, enters the reflecting lens group horizontally through the ball lens, is transmitted to the gain medium disc through the ball lens after being reflected again by the reflecting lens group, and is transmitted from the output port of the reflecting lens group after being transmitted back and forth for many times.
The WDM filter, pump source and gain medium disk combination realizes the gain amplification of light. The pump source and the gain medium disc are different based on the wavelength of the signal light, and an LD light source with the wavelength of 808nm and a neodymium yttrium aluminum garnet (Nd: YAG) single crystal are generally selected aiming at the wavelength of 1064 nm; for 1550nm wavelength, a laser diode LD light source with 976nm wavelength and Er are generally selected 3+ /Yb 3+ Double-doped phosphate glass; the LD light source with the wavelength of 1570nm and the Tm are generally selected for the wavelength of 1950nm 3+ Silicate glass.
The WDM filters have different reflectivities for light of different wavelengths. The WDM filter will reflect the pump light and not the signal light. The WDM filter is placed at an inclination angle of 45 DEG in the optical path, and reflects the pump light to the gain medium disk without affecting the reciprocation of the signal light. The pumping source is used as an energy source and is used for generating pumping light to excite the gain medium, and particles transition to a high energy level from a ground state after the gain medium disc receives the pumping light, so that the population inversion is realized. When the signal light is irradiated to the gain medium disc, stimulated radiation can be generated, and electrons with high energy level can migrate to low energy level and emit photons with the same frequency as the signal light, so that the signal light is amplified. In the embodiment of the invention, the signal light passes through the gain medium disc repeatedly, and the amplification factor is improved through repeated gain.
The invention adopts the reflecting lens to input light with the same angle with the reflecting light, can effectively improve the system stability and reduce the cost, and uses the reflecting lens group structure to replace a multi-piece reflecting mirror structure, thereby effectively reducing the volume, reducing the installation difficulty and obtaining smaller loss.
The multi-path pumping optical system provided by the embodiment of the invention is mainly applied to the field of optical fiber communication, and the reflecting lens group structure is used for replacing a multi-sheet reflecting mirror structure in the prior scheme in the embodiment of the invention, so that the multi-path pumping optical system has the advantages of simple structure and low cost.
The schematic diagram of the multi-path pumping optical system provided by the embodiment of the invention is shown in fig. 1, and the system consists of a reflecting lens group 1, a ball lens 2, a pumping source 3, a WDM filter 4, a gain medium disc 5 and a reflecting mirror 6. The combination of the reflective lens group 1 and the mirror 6 enables multiple round trips of light in the system. The light enters the reflecting lens group 1 from the input port, is focused by the ball lens 2, is applied to the gain medium disc 5, is reflected by the reflecting mirror 6, enters the reflecting lens group 1 horizontally through the ball lens 2, is reflected again by the reflecting lens group 1, is applied to the gain medium disc 5 through the ball lens 2, and is emitted from the output port of the reflecting lens group 1 after a plurality of round trips. The pump source 3 provides pump light and the WDM filter 4 has different reflectivities for light of different wavelengths. The WDM filter 4 reflects the pump light and not the signal light. The WDM filter 4 is placed at an inclination of 45 ° in the optical path to reflect the pump light to the gain medium disc 5 without affecting the reciprocation of the signal light.
The structure of the reflecting lens is shown in fig. 2, the reflecting lens is a square ball lens, the aspect ratio of the cross section of the reflecting lens is 2, the front surface of the reflecting lens is a spherical surface, and the rear surface of the reflecting lens is a plane plated reflecting film. When light is incident on the front surface of the reflecting lens, reflected by the rear surface and then emitted from the front surface, the deflection of the light path is completed, and the incident point and the emergent point correspond to the two ports of the reflecting lens. Since the rear surface of the reflecting lens is located on the focal plane of the front surface, the incident light and the outgoing light are parallel to each other, irrespective of the incident angle. The requirement on the installation precision of the reflecting lens is effectively reduced, and the stability of the light path is further improved. As shown in fig. 3, the reflection lens group 1 is formed by combining a plurality of identical reflection lenses, and the output port of each reflection lens and the input port of the next reflection lens are symmetrical with respect to the center of the reflection lens group, and the number of the ports is generally 4×4 or 8×8. Two empty ports are used as input ports and output ports of signal light in the system.
Fig. 4 shows a schematic port diagram of the reflection lens group 1, which is a 4×4 port layout. Light is incident from the incident port P1, and since the reflection lens group 1 is centered on the mirror 6 in the optical path, the light reflected back through the mirror reaches the port P2 symmetrical to the incident port P1. After passing through the reflecting lens, the light exits from the other port P3, and passes through the reflecting mirror back to the port P4. And thus comes out from the exit port P16 after 8 round trips.
The pump source 3, WDM filter 4 and gain medium disk 5 combine to achieve gain amplification of the light. The pump source 3 and the gain medium disc 5 are different based on the wavelength of the signal light. The pump source 3 is used as an energy source and is used for generating pump light to excite the gain medium, and the gain medium disc 5 receives the pump light and then the particles transition from the ground state to the high energy level, so that the population inversion is realized. When the signal light strikes the gain medium disc 5, stimulated radiation occurs, and electrons with high energy level migrate to low energy level and emit photons with the same frequency as the signal light, so that the signal light is amplified. In the technical scheme, the signal light repeatedly passes through the gain medium disc 5, and the amplification factor is improved through repeated gain.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A multipass pump optical system, comprising: the optical gain device comprises a reflecting lens group (1), a ball lens (2), an optical gain amplifying module and a reflecting mirror (6) which are sequentially arranged along an optical axis;
the reflecting lens group (1) is arranged symmetrically about the center of the reflecting mirror (6); light is emitted in the same angle after entering the reflecting lens group (1);
during operation, light is injected from an input port of the reflecting lens group (1), is focused by the ball lens (2), then is injected onto the optical gain amplifying module, is reflected by the reflecting mirror (6), is injected into the reflecting lens group (1) horizontally by the ball lens (2), is injected onto the optical gain amplifying module again by the reflecting lens group (1) after being reflected by the ball lens (2), and is injected from an output port of the reflecting lens group (1) after being repeatedly reciprocated.
2. The multipass pump optical system of claim 1, wherein the reflection-transmissionThe port number of the lens group is 2 n ×2 m； The reflecting lens group comprises a plurality of identical reflecting lenses, the output port of each reflecting lens and the input port of the next reflecting lens are symmetrical about the center of the reflecting lens group, and two empty ports are reserved as input and output ports of signal light, wherein n and m are positive integers.
3. The multipass pump optical system of claim 2, wherein the reflecting lens is a square ball lens having a spherical front surface and a planar rear surface coated with a reflecting film, and has a cross-sectional aspect ratio of 2.
4. A multipass pump optical system according to any of claims 1 to 3, wherein the optical gain amplification module comprises: a pump source (3), a WDM filter (4) and a gain medium disc (5);
the pump source (3) is used for generating pump light for exciting the gain medium;
the WDM filter (4) is used for reflecting the pump light to the gain medium disc (5) without influencing the reciprocating of the signal light;
the gain medium disc (5) is used for receiving the pumping light and then enabling particles to transition from a ground state to a high energy level so as to realize the inversion of the particle number; when the signal light is irradiated to the gain medium disc (5), stimulated radiation is generated, electrons with high energy level migrate to low energy level and emit photons with the same frequency as the signal light, so that the signal light is amplified.
5. A multipass pump optical system according to claim 4 wherein the pump source (3) and the gain medium disc (5) are determined in dependence on the wavelength of the signal light.
6. The multi-pass pump optical system according to claim 5, wherein when the wavelength of the signal light is 1064nm, the pump source (3) is an LD light source with a wavelength of 808nm, and the gain medium disc (5) is a neodymium yttrium aluminum garnet (Nd: YAG) single crystal.
7. The multipass pump optical system of claim 5, wherein the pump source (3) is a laser diode LD source with a wavelength of 976nm when the wavelength of signal light is 1550nm, and the gain medium disk (5) is Er 3+ /Yb 3+ Double doped phosphate glass.
8. The multi-pass pump optical system according to claim 5, wherein when the wavelength of signal light is 1950nm, the pump source (3) is an LD light source with wavelength of 1570nm, and the gain medium disk (5) is Tm doped 3+ Silicate glass.
9. A multipass pump optical system according to any of claims 4 to 8 wherein the WDM filter (4) is disposed at a 45 ° tilt angle.
10. An optical network comprising a multi-pass pump optical system, characterized in that the multi-pass pump optical system is a multi-pass pump optical system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311621218.4A CN117631403A (en) | 2023-11-28 | 2023-11-28 | Multi-path pumping optical system and optical network device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311621218.4A CN117631403A (en) | 2023-11-28 | 2023-11-28 | Multi-path pumping optical system and optical network device |
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| CN117631403A true CN117631403A (en) | 2024-03-01 |
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| CN202311621218.4A Pending CN117631403A (en) | 2023-11-28 | 2023-11-28 | Multi-path pumping optical system and optical network device |
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| CN (1) | CN117631403A (en) |
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- 2023-11-28 CN CN202311621218.4A patent/CN117631403A/en active Pending
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