CN210142796U - Two-stage cascade low-noise erbium-doped optical fiber amplifier optical system - Google Patents
Two-stage cascade low-noise erbium-doped optical fiber amplifier optical system Download PDFInfo
- Publication number
- CN210142796U CN210142796U CN201921167068.3U CN201921167068U CN210142796U CN 210142796 U CN210142796 U CN 210142796U CN 201921167068 U CN201921167068 U CN 201921167068U CN 210142796 U CN210142796 U CN 210142796U
- Authority
- CN
- China
- Prior art keywords
- stage
- erbium
- doped fiber
- optical
- optical signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
The utility model relates to an optical communication network equipment technical field particularly, relates to a doublestage cascades low noise erbium-doped fiber amplifier optical system. A double-stage cascade low-noise erbium-doped fiber amplifier optical system comprises a first-stage amplification system, a second-stage amplification system, a first fiber coupler and a second fiber coupler. The first-stage amplification system comprises a first-stage erbium-doped fiber, a first isolator, a first pump laser and a first Wavelength Division Multiplexer (WDM); the second-stage amplification system comprises a second-stage erbium-doped fiber, a second isolator, a second pump laser and a second Wavelength Division Multiplexer (WDM).
Description
Technical Field
The utility model relates to an optical communication network equipment technical field particularly, relates to a doublestage cascades low noise erbium-doped fiber amplifier optical system.
Background
An erbium-doped fiber is an optical fiber doped with a small amount of rare earth, in particular an optical fiber doped with elemental erbium. In the early 90 s, the successful development of erbium-doped optical fibers breaks through the limitation of optical fiber loss on the transmission distance of optical fiber communication, so that the all-optical communication distance is prolonged to thousands of kilometers, revolutionary change is brought to the optical fiber communication, and the erbium-doped optical fiber is known as a milestone for the development of optical communication.
The existing design approach for Erbium Doped Fiber Amplifiers (EDFAs) is through the amplification of 1550nm signal light, which typically employs single-stage erbium doped fiber amplification techniques. The optical system is simple in design and convenient to operate, but has a high system noise coefficient and a low signal-to-noise ratio, and has poor performance in a high-stability optical communication transmission system, and the long-term working of the optical system can reduce the service life of a pump laser and influence the long-term stable working of the optical system, so that the optical system is difficult to apply to the high-stability optical communication transmission system.
Therefore, how to reduce the noise coefficient of the EDFA optical system, further reduce the failure rate of the pump laser during long-term operation, and improve the stability of the EDFA optical system becomes a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a doublestage cascades low noise erbium-doped fiber amplifier optical system, through the cascade of multistage amplification system and the setting of a plurality of isolators, has reduced the noise figure that doublestage cascades low noise erbium-doped fiber amplifier optical system, has further reduced the failure rate of pump laser long-term work, has improved the stability that doublestage cascades low noise erbium-doped fiber amplifier optical system.
The embodiment of the utility model is realized like this:
the embodiment of the utility model provides a doublestage cascades low noise erbium-doped fiber amplifier optical system, include:
the first-stage amplification system comprises a first-stage erbium-doped fiber for receiving part of output optical signals and pump light of the first optical fiber coupler;
the second-stage amplification system comprises a second-stage erbium-doped fiber for receiving output optical signals and pump light of the first-stage amplification system, and the length of the second-stage erbium-doped fiber is greater than that of the first-stage erbium-doped fiber;
a first fiber coupler configured to receive an input optical signal of the optical system and route the input optical signal to the first stage amplification system and an input optical power detection device;
a second fiber coupler configured to receive the output optical signal of the second stage amplification system and route the output optical signal to the optical system output and to an output optical power detection device.
Optionally, the first stage amplification system comprises:
a first isolator configured to receive an output optical signal of the first fiber coupler;
a first pump laser configured to provide pump light to the first stage amplification system;
a first wavelength division multiplexer WDM configured to receive an output optical signal from the first isolator and pump light from the first pump laser and provide an input optical signal to the first stage erbium doped fiber.
Optionally, the second stage amplification system comprises:
a second isolator configured to receive an output optical signal of the first stage amplification system and output an optical signal;
a second pump laser configured to provide pump light to the second stage amplification system;
a second wavelength division multiplexer WDM configured to receive the output optical signal from the second isolator and the pump light from the first pump laser and provide an input optical signal to the second stage erbium doped fiber.
Optionally, the two-stage cascade low-noise erbium-doped fiber amplifier optical system further includes a third isolator that receives the output optical signal of the second-stage amplification system and provides the input optical signal for the second fiber coupler.
Optionally, the ratio of the length of the first-stage erbium-doped fiber to the length of the second-stage erbium-doped fiber is 1: 2.
Optionally, the length of the first stage erbium-doped fiber is 6 meters, and the length of the second stage erbium-doped fiber is 12 meters.
Optionally, the first pump laser is arranged in a forward direction.
Optionally, the second pump laser is arranged in the forward direction.
Optionally, the optical signal of the optical system is transmitted in a single direction.
Optionally, the input optical power detection device is specifically configured as an input PIN photodiode, and the output optical power detection device is specifically configured as an output PIN photodiode.
The utility model discloses beneficial effect includes: through the cascade of the multistage amplification system and the arrangement of the plurality of isolators, the noise coefficient of the optical system of the two-stage cascade low-noise erbium-doped optical fiber amplifier is reduced, the failure rate of the pump laser during long-term operation is further reduced, and the stability of the optical system of the two-stage cascade low-noise erbium-doped optical fiber amplifier is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic structural diagram of an optical system of a two-stage cascade low-noise erbium-doped fiber amplifier according to an embodiment of the present invention.
Illustration of the drawings:
among them, 100-amplifier optical system; 102-a first fiber coupler; 104-input optical power detection means; 112-a first isolator; 114-a first wavelength division multiplexer WDM; 116-a first pump laser; 118-first order erbium doped fiber; 122-a second isolator; 124-a second wavelength division multiplexer, WDM; 126-a second pump laser; 128-second stage erbium doped fiber; 132-a third isolator; 142-a second fiber coupler; 144-output optical power detection means.
Detailed Description
Now, in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship in which the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
First embodiment
As shown in fig. 1, the amplifier optical system 100 includes a first fiber coupler 102 at the input of the system, which receives an input optical signal from the outside. Such as an input optical signal from an optical cable or a signal from other optical communication equipment. The incoming optical signal may comprise signals of different frequencies and different wavelength bands. In at least other embodiments, the first fiber coupler 102 is provided with a standard interface, such as a small round FC or a large square SC, to facilitate connection to a universal fiber optic cable and other optical devices.
The first fiber coupler 102 routes most of the input optical signal to the first stage amplification system. In this embodiment, the first fiber coupler 102 is configured to route 99% of the input optical signal to the first stage amplification system, which is configured to retain as strong an input optical signal as possible.
The first fiber coupler 102 routes another portion of the input optical signal to the input optical power detection device 104 for power measurement of the total input optical signal. In this embodiment, the first fiber coupler 102 is configured to route 1% of the input optical signal to the input optical power detection device 104, so as to determine the power value of all the input optical signals, and provide data reference for evaluating the amplification effect of the amplifier optical system 100. In this embodiment, the first fiber coupler 102 may be specifically configured as a PIN photodiode, as shown in fig. 1.
The first stage amplification system includes a first stage erbium doped fiber 118 that receives the output optical signal of the first fiber coupler 102 and the pump light. In this embodiment, the first stage amplification system further includes a first isolator 112, a first wavelength division multiplexer WDM114, and a first pump laser 116, as shown in fig. 1.
The first isolator 112 receives the output optical signal from the first optical fiber coupler 102, and the first isolator 112 routes the optical signal with the wavelength of 1550nm in the original input optical signal through the first isolator 112, and substantially attenuates and prevents the optical signals with the wavelengths other than 1550nm from passing through, so that the output optical signal of the first isolator 112 is the optical signal with the wavelength of 1550nm required by the amplifier optical system 100. This has the advantage of avoiding interference of other wavelength signals in the optical signal within the amplifier optical system 100. The gain difficulty of the amplifier optical system 100 is reduced, and the service life and stability of the pump laser are improved.
The first pump laser 116 serves as a pump light source of the first-stage amplification system. In this embodiment, the first pump laser 116 injects pump light into the first wavelength division multiplexer WDM114 before injecting pump light into the first stage erbium doped fiber 118. In at least other embodiments, the center wavelength of the first pump laser 116 is set to 974nm and the pump light power is set to 360 mW.
Further, the first pump laser 116 is configured to be forward pumped, i.e., the signal light and the pump light are configured to have the same transmission direction. The forward pumping arrangement allows the amplifier optical system 100 to achieve a lower noise figure than the dereverbered and bidirectional pumping arrangements. The noise figure is used as an index parameter of the optical system of the amplifier for measuring the degree of deterioration of the signal-to-noise ratio of the optical system, and can reflect the performance of the optical system of the amplifier.
It should be noted that, in the optical system of the erbium-doped fiber amplifier, most of the components are passive optical devices, and the reliability is high. The pump laser is an active device, and in order to ensure stable output gain of the system, the power of the pump laser needs to be adjusted according to the ratio of the output optical signal power and the input optical signal power of the system, so that the optical system of the amplifier obtains a stable output level. Therefore, the optical system of the amplifier can be more stable due to a lower noise coefficient, so that the adjustment frequency and the adjustment amplitude of the pump laser are reduced, and the stability and the service life of the pump laser are improved. The improvement of the stability and the improvement of the service life of the pump laser directly determine the overall stability of the optical system of the erbium-doped fiber amplifier, so that the optical system of the erbium-doped fiber amplifier can be practically applied in the field of optical communication inter-provincial trunk lines or international trunk lines.
The first wavelength division multiplexer WDM114 multiplexes the optical signal from the first isolator 112 and the pump light from the first pump laser 116, and the multiplexed optical signal output is injected into the first stage erbium-doped fiber 118 for pre-amplification of the optical signal.
The first-stage erbium-doped optical fiber 118 receives an output optical signal from the first wavelength division multiplexer WDM114, the output optical signal including a 1550nm wavelength optical signal and a 980nm wavelength pump light, and the first-stage erbium-doped optical fiber 118 absorbs energy of the pump light and uses the absorbed energy for amplification of the optical signal. In this embodiment, the length of the first-stage erbium-doped fiber 118 is set smaller than the length of the second-stage erbium-doped fiber 128. This arrangement enables the amplifier optical system 100 to obtain a smaller noise figure.
The second stage amplification system includes a second stage erbium doped fiber 128 that receives the output optical signal from the first stage amplification system and receives the pump light, the length of the second stage erbium doped fiber 128 being greater than the length of the first stage erbium doped fiber 118. In this embodiment, the second stage amplification system further includes a second isolator 122, a second wavelength division multiplexer WDM124, and a second pump laser 126.
A second isolator 122, in this embodiment configured to receive the pre-amplified optical signal from the first stage erbium doped fiber 118. The second isolator 122 routes the optical signal with the wavelength of 1550nm in the optical signal through the isolator, and substantially attenuates and prevents the interference optical signals with wavelengths other than 1550nm from passing through, so that the optical signal output by the second isolator 122 is the optical signal with the wavelength of 1550nm required by the amplifier optical system 100. The beneficial effect of such an arrangement is that it is avoided that other wavelength signals in the input optical signal of the second-stage amplification system generate interference in the amplifier optical system 100, thereby reducing the noise coefficient of the system, reducing the frequency and amplitude of power adjustment of the pump laser, improving the stability and life of the pump laser, and further improving the stability of the optical system.
The second pump laser 126 is configured to provide pump light to the second stage amplification system. In this embodiment, the second pump laser 126 injects pump light into the second wavelength division multiplexer WDM124 before injecting pump light into the second stage erbium doped fiber 128. In at least other embodiments, the second pump laser 126 is set up the same as the first pump laser with a center wavelength of 974nm and a pump power of 360 mW.
Further, the second pump laser 126 is configured to be forward pumped, i.e., the signal light and the pump light are configured to travel in the same direction. The forward pumping arrangement allows the amplifier optical system 100 to achieve a lower noise figure than the dereverbered and bidirectional pumping arrangements.
The second wavelength division multiplexer WDM124 in this embodiment multiplexes the optical signal from the second isolator 122 and the pump light from the second pump laser 126, and injects the multiplexed optical signal output into the second-stage erbium-doped fiber 128 for secondary amplification of the optical signal.
The second stage erbium doped fiber 128 receives the output optical signal from the second wavelength division multiplexer WDM124, the output optical signal comprising a 1550nm wavelength optical signal and a 980nm wavelength pump light, the second stage erbium doped fiber 128 absorbing energy of the pump light and using the absorbed energy for amplification of the optical signal. In this embodiment, the length of the second stage erbium doped fiber 128 is greater than the length of the first stage erbium doped fiber 118.
The erbium-doped amplifier is generally applied to a long-distance trunk line and used as an optical relay, and passive optical devices in an amplifier optical system, such as an optical fiber coupler, an isolator, a wavelength division multiplexer and the like, are generally stable in performance and are not easy to damage. An active device pump laser is easy to malfunction, and if the pump laser fails to work, an optical signal is not amplified in an erbium-doped amplifier, and large loss is generated, so that a receiving station cannot receive the optical signal, communication is interrupted, and the failure is not allowed on some high-reliability service load optical cables. Therefore, the second-stage amplification system can effectively improve the system reliability, when the first-stage amplification system breaks down, the second-stage amplification system can amplify optical signals at all, the optical signals can still be received at the receiving end of the optical cable, the signal intensity cannot reach the normal level at the moment, communication interruption cannot be generated, and precious time is provided for system emergency maintenance.
Further, the ratio of the length of the first-stage erbium-doped fiber 118 to the length of the second-stage erbium-doped fiber 128 is set to 1:2, a smaller noise figure can be obtained.
Further, the length of the first-stage erbium-doped fiber 118 is set to 6 meters, and the length of the second-stage erbium-doped fiber 128 is set to 12 meters, so that a smaller noise figure can be obtained. Under the conditions set in the way, a laboratory can obtain the high-quality amplifier performance with the output signal light power of 23dBm and the noise coefficient of 3.7dB, so that the frequency and the amplitude of power adjustment control of the pump laser are reduced, the stability and the service life of the pump laser are improved, and the amplifier optical system 100 can be applied to long-distance communication.
In this embodiment, the amplifier optical system 100 further includes a third isolator 132 that receives the output optical signal from the second stage amplification system and outputs a desired wavelength-specific optical signal. The third isolator 132 routes the optical signal with the wavelength of 1550nm in the secondary amplified optical signal output by the second-stage erbium-doped fiber 128 through the third isolator 132, and substantially attenuates and prevents the interference optical signal with the wavelength other than the signal with the wavelength of 1550nm from passing through, so that the optical signal output by the third isolator 132 is the optical signal with the wavelength of 1550nm required to be output by the amplifier optical system 100. This has the advantage that the optical signal output by the amplifier optical system 100 can be prevented from including other interfering signals.
The second fiber coupler 142 is configured in this embodiment to receive the output optical signal from the second stage amplification system, i.e., from the third isolator 132. The second fiber coupler 142 routes a portion of the optical signal injected by the third isolator 132 to the output optical power detection device 144 for power measurement of the total output optical signal.
In this embodiment, the second fiber coupler 142 routes 1% of the optical signals injected by the third isolator 132 to the output optical power detection device 144, so as to determine the power of all the output optical signals, and provide a data reference for evaluating the amplification effect of the amplifier optical system 100.
In this embodiment, the second fiber coupler 142 may be specifically configured as a PIN photodiode, as shown in fig. 1.
Further, by comparing the measured value of the output optical power detection device 144 with the value of the input optical power detection device 104, the output gain of the amplifier optical system 100 can be determined, and the powers of the first pump laser 116 and the second pump laser 126 can be adjusted by other known control methods, so as to ensure that the amplifier optical system 100 maintains a stable output index.
The second fiber coupler 142 routes most of the optical signal injected by the third isolator 132 to the output of the amplifier optical system 100. In at least other embodiments, the output of the second fiber coupler 142 is provided with a standard interface, such as a small round FC or a large square SC, to facilitate connection to a universal fiber optic cable and other optical devices.
In this embodiment, the second fiber coupler 142 routes 99% of the optical signal injected by the third isolator 132 to the output of the amplifier optical system 100, which is configured to retain as much higher intensity of the output optical signal as possible.
Further, the optical signal in the amplifier optical system 100 is transmitted in a single direction. Since both the first pump laser 116 and the second pump laser 126 are arranged in the forward direction, it is necessary to ensure that the light direction in the system coincides with the direction of the pump lasers. The forward pumping arrangement allows the amplifier optical system 100 to achieve a lower noise figure than the dereverbered and bidirectional pumping arrangements.
The amplifier optical system 100 has simple assembly, convenient operation and lower cost, can reduce the failure rate of the long-term work of the pump laser, and has lower noise coefficient, so that the application in the optical communication transmission system with high stability becomes possible.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A two-stage cascaded low-noise erbium-doped fiber amplifier optical system, comprising:
the first-stage amplification system comprises a first-stage erbium-doped fiber for receiving part of output optical signals and pump light of the first optical fiber coupler;
the second-stage amplification system comprises a second-stage erbium-doped fiber for receiving output optical signals and pump light of the first-stage amplification system, and the length of the second-stage erbium-doped fiber is greater than that of the first-stage erbium-doped fiber;
a first fiber coupler configured to receive an input optical signal of the optical system and route the input optical signal to the first stage amplification system and an input optical power detection device;
a second fiber coupler configured to receive the output optical signal of the second stage amplification system and route the output optical signal to the optical system output and to an output optical power detection device.
2. The two-stage cascaded low-noise erbium-doped fiber amplifier optical system of claim 1, wherein the first-stage amplification system comprises:
a first isolator configured to receive an output optical signal of the first fiber coupler;
a first pump laser configured to provide pump light to the first stage amplification system;
a first wavelength division multiplexer WDM configured to receive an output optical signal from the first isolator and pump light from the first pump laser and provide an input optical signal to the first stage erbium doped fiber.
3. The two-stage cascaded low-noise erbium-doped fiber amplifier optical system of claim 2, wherein the second-stage amplification system comprises:
a second isolator configured to receive an output optical signal of the first stage amplification system and output an optical signal;
a second pump laser configured to provide pump light to the second stage amplification system;
a second wavelength division multiplexer WDM configured to receive the output optical signal from the second isolator and the pump light from the first pump laser and provide an input optical signal to the second stage erbium doped fiber.
4. The two-stage cascaded low-noise erbium-doped fiber amplifier optical system of claim 1, further comprising a third isolator for receiving an output optical signal of the second stage amplification system and providing an input optical signal to the second fiber coupler.
5. The two-stage cascade low noise erbium-doped fiber amplifier optical system of claim 1, wherein the ratio of the length of the first stage erbium-doped fiber to the length of the second stage erbium-doped fiber is 1: 2.
6. The two-stage cascade low noise erbium-doped fiber amplifier optical system of claim 1 or 5, wherein the length of the first stage erbium-doped fiber is 6 meters, and the length of the second stage erbium-doped fiber is 12 meters.
7. The optical system of claim 2, wherein the first pump laser is forward configured.
8. The optical system of claim 3, wherein the second pump laser is forward-configured.
9. The optical system of claim 1, wherein the optical signal of the optical system is transmitted in a single direction.
10. The optical system of claim 1, wherein the input optical power detection device is specifically configured as an input PIN photodiode, and the output optical power detection device is specifically configured as an output PIN photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921167068.3U CN210142796U (en) | 2019-07-24 | 2019-07-24 | Two-stage cascade low-noise erbium-doped optical fiber amplifier optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921167068.3U CN210142796U (en) | 2019-07-24 | 2019-07-24 | Two-stage cascade low-noise erbium-doped optical fiber amplifier optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210142796U true CN210142796U (en) | 2020-03-13 |
Family
ID=69735810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921167068.3U Active CN210142796U (en) | 2019-07-24 | 2019-07-24 | Two-stage cascade low-noise erbium-doped optical fiber amplifier optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210142796U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505976A (en) * | 2021-02-03 | 2021-03-16 | 深圳市汇海鑫科技有限公司 | Optical signal amplification method |
| CN114499678A (en) * | 2022-01-28 | 2022-05-13 | 长春理工大学 | Multichannel balanced aerospace light preamplifier for random large input power range |
| CN115085807A (en) * | 2022-04-27 | 2022-09-20 | 苏州中科光桥空间技术有限公司 | Small-size laser communication system |
-
2019
- 2019-07-24 CN CN201921167068.3U patent/CN210142796U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505976A (en) * | 2021-02-03 | 2021-03-16 | 深圳市汇海鑫科技有限公司 | Optical signal amplification method |
| CN114499678A (en) * | 2022-01-28 | 2022-05-13 | 长春理工大学 | Multichannel balanced aerospace light preamplifier for random large input power range |
| CN114499678B (en) * | 2022-01-28 | 2023-07-07 | 长春理工大学 | Multi-channel balanced aerospace pre-amplifier for random large input power range |
| CN115085807A (en) * | 2022-04-27 | 2022-09-20 | 苏州中科光桥空间技术有限公司 | Small-size laser communication system |
| CN115085807B (en) * | 2022-04-27 | 2024-04-05 | 苏州中科光桥空间技术有限公司 | Small-sized laser communication system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210142796U (en) | Two-stage cascade low-noise erbium-doped optical fiber amplifier optical system | |
| KR100265788B1 (en) | Optical fiber amplifier having high small signal gain | |
| EP0669730A2 (en) | Optical amplifier and optical communication system provided with the optical amplifier | |
| CA2140802C (en) | Optical fiber system and method for overcoming the effects of polarization gain anisotropy in a fiber amplifier | |
| US7508575B2 (en) | Cascaded pump delivery for remotely pumped erbium-doped fiber amplifiers | |
| Ciaramella et al. | 1.28 Terabit/s (32× 40 Gbit/s) WDM transmission over a double-pass free space optical link | |
| US20200381885A1 (en) | Optical amplifier | |
| CN102280803A (en) | Pulse fiber amplifier | |
| US6934078B2 (en) | Dispersion-compensated erbium-doped fiber amplifier | |
| EP1096703A2 (en) | Long-band light source for testing optical elements using feedback loop | |
| CN214255051U (en) | High-power optical fiber amplifier | |
| Haugen et al. | Bidirectional transmission at 622 Mb/s utilizing erbium-doped fiber amplifiers | |
| KR19990005155A (en) | Optical amplifier with absorber | |
| JPH05211367A (en) | Amplifier using amplification optical fiber | |
| CN202183550U (en) | Pulse optical fiber amplifier | |
| CN210899183U (en) | Optical structure of remote gain module | |
| CN209844964U (en) | Optical transmission system for extending unrepeatered transmission distance | |
| CN210668978U (en) | Low-noise erbium-doped optical fiber amplifier optical path structure | |
| CN102231473A (en) | EDFA (Erbium-doped optical fiber amplifier) | |
| US6504647B1 (en) | Optical fiber amplifier, a method of amplifying optical signals, optical communications system | |
| CN111416270A (en) | Pump alignment structure in optical amplifier | |
| CN201466463U (en) | Distributed broadband optical fiber raman amplifier | |
| Yu et al. | Analysis of optical gain enhanced erbium-doped fiber amplifiers using optical filters | |
| KR100219711B1 (en) | Optical fiber amplifier with flat gain property | |
| CN217387856U (en) | Optical fiber amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |