CN215528185U - Light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation - Google Patents
Light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation Download PDFInfo
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- CN215528185U CN215528185U CN202121050535.1U CN202121050535U CN215528185U CN 215528185 U CN215528185 U CN 215528185U CN 202121050535 U CN202121050535 U CN 202121050535U CN 215528185 U CN215528185 U CN 215528185U
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Abstract
The utility model relates to a light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation, which comprises a signal light source, an isolator, a first beam combiner, a gain optical fiber, a second beam combiner, a continuous pumping light source, a filter, a control light source and a modulator, wherein the isolator is arranged on the signal light source; the utility model introduces a pulse control light, the pulse control light enters the gain fiber in the time period of the pulse-free signal light, the inverse particle number of the upper energy level pumped by the continuous pumping light source of the device is consumed, and the pulse-free control light is in the time period of the pulse signal light. By adopting the structure, ASE is effectively reduced, and the gain of the pulse signal light can be controlled by controlling the duration and the light intensity of the pulse control light.
Description
Technical Field
The utility model relates to the field of laser radars, in particular to a light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation.
Background
The emitting source applied to the laser radar is usually a pulse optical fiber amplifier, and the common pulse optical fiber amplifier adopts a pulse seed light source and is added with an amplifier structure of continuous optical pumping. The problem of the common pulse laser is that the ASE is large, continuous pump light forms an inversion particle number in the pumping process all the time in a time period without the seed light pulse, and the inversion particle number easily forms an output of Amplified Spontaneous Emission (ASE) because no seed light pulse is consumed, so that the signal-to-noise ratio of the output laser is reduced, and the detection performance of the laser radar is reduced.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide an optical fiber amplifier that suppresses amplified spontaneous emission to reduce ASE and control the gain of signal light by adjusting the duration of control light.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation comprises a signal light source, an isolator, a first beam combiner, a gain optical fiber, a second beam combiner, a continuous pumping light source, a filter, a control light source and a modulator;
pulse signal light emitted by the signal light source passes through the isolator and then is coupled into the gain optical fiber after passing through the first beam combiner;
the control light source outputs pulse control light after being modulated by the modulator, and the pulse control light is coupled into the gain optical fiber after being coupled by the first beam combiner;
the continuous pumping light source outputs continuous pumping light, and the continuous pumping light is coupled to the gain fiber after passing through the second beam combiner to pump the gain fiber;
the gain optical fiber forms population inversion, time-sharing amplification is carried out on the pulse signal light and the pulse control light, and the amplified pulse signal light and the amplified pulse control light respectively output the signal light and the control light from two ports after passing through the filter.
Further, the signal light source adopts a semiconductor laser with the wavelength of 1530 nm to 1560 nm.
Further, the control light source adopts a semiconductor laser with the wavelength of 1535 nm.
Furthermore, the gain fiber adopts erbium-doped fiber or erbium-ytterbium co-doped fiber.
Furthermore, the optical fiber type is a single mode optical fiber or a multimode optical fiber, and the optical fiber structure is a single cladding optical fiber or a double cladding optical fiber.
Furthermore, the pumping light source adopts a semiconductor laser, and the wavelength of the semiconductor laser is 900 nm-1000 nm.
Furthermore, the pumping light source is connected with the second beam combiner and arranged at the front end or the rear end of the gain fiber.
Furthermore, the modulator, the control light source and the first beam combiner are connected in sequence and are arranged at the front end or the rear end of the gain optical fiber.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model effectively reduces ASE, and can control the gain of the pulse signal light by controlling the duration and the light intensity of the pulse control light.
Drawings
FIG. 1 is a schematic view of an optical fiber amplifier for suppressing amplified spontaneous emission according to example 1 of the present invention;
FIG. 2 is a schematic diagram of the pulse timing of an optically controlled fiber amplifier for suppressing amplified spontaneous emission according to the present invention;
the optical fiber amplifier comprises a signal light source 1, an isolator 2, a first beam combiner 3, a gain optical fiber 4, a second beam combiner 5, a filter 6, a control light source 7, a modulator 8 and a continuous pumping light source 9.
Detailed Description
The utility model is further explained below with reference to the drawings and the embodiments.
Referring to fig. 1, the present embodiment provides an optical fiber amplifier for suppressing amplified spontaneous emission, which includes a signal light source 1, an isolator 2, a first beam combiner 3, a gain fiber 4, a second beam combiner 5, a filter 6, a control light source 7, a modulator 8, and a continuous pumping light source 9.
In this embodiment, the signal light source 1 is a pulse output semiconductor laser, and pulse signal light emitted by the pulse output semiconductor laser passes through the isolator 2 and is then coupled into the gain fiber 4 through the first beam combiner 3, the control light source 7 outputs pulse control light after being modulated by the modulator 8, and the pulse control light is coupled into the gain fiber 4 through the first beam combiner 3; the continuous pumping light source 9 outputs continuous pumping light, and the continuous pumping light is coupled to the gain fiber 4 through the second beam combiner 5 to pump the gain fiber 4.
In this embodiment, when the continuous pumping light source continues pumping, the gain fiber is always in a population inversion state, and after the first pulse signal light enters the gain fiber, the inversion population is consumed, and the pulse signal light is amplified. After the first pulse signal light is finished, the gain fiber is continuously in a population inversion state, and if the inversion population is not consumed before the second pulse signal light enters the gain fiber, Amplified Spontaneous Emission (ASE) is formed. Therefore, in the utility model, after the first pulse signal light is finished, the pulse control light is coupled into the gain fiber, the inversion particle number is continuously consumed until the time delta t before the second pulse signal light enters the gain fiber is finished, the inversion particle number is consumed within the pulse control light duration, ASE is not formed, and only one amplified pulse control light is provided. And in the delta t time period, the pumping light source continues to pump the gain fiber to accumulate the required inversion particle number for the light amplification of the second pulse signal. The time of delta t is related to the service life of the upper energy level of the gain optical fiber, and the size of delta t can be artificially controlled, so that the number of inversion particles accumulated in the delta t time period is controlled, and the gain of the pulse signal light is controlled.
Specifically, referring to fig. 2, in the present embodiment, t1 to t2, t4 to t5 in fig. 2 are durations of the pulse signal light, t2 to t3, and t5 to t6 bits of pulse control light, and Δ t = t4 to t 3. The light intensity of the pulse signal light is Ps, and the light intensity of the pulse control light is Pc. The gain fiber 4 is continuously pumped by the pumping light source to form population inversion, and after the first pulse signal light enters the gain fiber 4, the inversion population is consumed, and the pulse signal light is amplified. After the first pulse signal light ends, the pulse control light enters the gain fiber 4, the inversion particle number is continuously consumed until the second pulse signal light t3 ends, the inversion particle number is consumed within the pulse control light duration, ASE is not formed, and only one amplified pulse control light is provided. And in the time period of delta t = t 4-t 3, the pumping light source continues to pump the gain fiber 4 to obtain the number of inversion particles required for amplifying and accumulating the second pulse signal light. The time of delta t is related to the service life of the upper energy level of the gain optical fiber, and the size of delta t can be artificially controlled, so that the number of inversion particles accumulated in the delta t time period is controlled, and the gain of the pulse signal light is controlled.
Preferably, the gain fiber 4 time-divisionally amplifies the pulse signal light and the pulse control light, and the amplified pulse signal light and the amplified pulse control light respectively output the amplified pulse signal light and the amplified pulse control light from two ports after passing through the filter 6.
Preferably, the wavelength of the control light source 7 is 1535nm, and the gain fiber 4 has the strongest fluorescence spectrum at 1535nm, so that the population inversion at the time of no-signal light can be consumed most efficiently.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (8)
1. A light-operated optical fiber amplifier for restraining amplified spontaneous emission is characterized by comprising a signal light source, an isolator, a first beam combiner, a gain optical fiber, a second beam combiner, a continuous pumping light source, a filter, a control light source and a modulator;
pulse signal light emitted by the signal light source passes through the isolator and then is coupled into the gain optical fiber after passing through the first beam combiner;
the control light source outputs pulse control light after being modulated by the modulator, and the pulse control light is coupled into the gain optical fiber after being coupled by the first beam combiner;
the continuous pumping light source outputs continuous pumping light, and the continuous pumping light is coupled to the gain fiber after passing through the second beam combiner to pump the gain fiber;
the gain optical fiber forms population inversion, time-sharing amplification is carried out on the pulse signal light and the pulse control light, and the amplified pulse signal light and the amplified pulse control light respectively output the signal light and the control light from two ports after passing through the filter.
2. The optically controlled optical fiber amplifier for suppressing amplified spontaneous emission as claimed in claim 1, wherein said signal light source is a semiconductor laser having a wavelength of 1530 nm to 1560 nm.
3. The optically controlled optical fiber amplifier for suppressing amplified spontaneous emission of claim 1, wherein the control light source is a semiconductor laser with a wavelength of 1535 nm.
4. The optically controlled fiber amplifier of claim 1, wherein the gain fiber is erbium doped or erbium ytterbium co-doped.
5. The optically controlled fiber amplifier for suppressing amplified spontaneous emission of claim 4, wherein the optical fiber is of a single mode fiber or a multimode fiber, and the optical fiber structure is a single clad fiber or a double clad fiber.
6. The optical fiber amplifier as claimed in claim 1, wherein the pumping light source is a semiconductor laser with a wavelength of 900nm to 1000 nm.
7. The optically controlled optical fiber amplifier for suppressing amplified spontaneous emission of claim 1, wherein the pump light source is connected to the second beam combiner and disposed at the front end or the rear end of the gain fiber.
8. The optically controlled optical fiber amplifier for suppressing amplified spontaneous emission of claim 1, wherein the modulator, the control light source and the first beam combiner are sequentially connected and disposed at the front end or the rear end of the gain fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121050535.1U CN215528185U (en) | 2021-05-17 | 2021-05-17 | Light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121050535.1U CN215528185U (en) | 2021-05-17 | 2021-05-17 | Light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation |
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| CN215528185U true CN215528185U (en) | 2022-01-14 |
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| CN202121050535.1U Active CN215528185U (en) | 2021-05-17 | 2021-05-17 | Light-operated optical fiber amplifier for inhibiting amplified spontaneous radiation |
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2021
- 2021-05-17 CN CN202121050535.1U patent/CN215528185U/en active Active
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