High-power spontaneous radiation light source

Abstract

The invention discloses a high-power spontaneous radiation light source, and relates to the field of optical communication and optical fiber sensing, and the high-power spontaneous radiation light source comprises a first-stage light path structure and a second-stage light path structure. The primary optical path structure comprises a first pump laser, a first erbium optical fiber and an optical fiber filter; the first pump laser emits first pump light; the first erbium optical fiber absorbs the first pump light, so that the spontaneous radiation spectrum works in a short wave part in the whole spectrum range, and the internal light is transmitted to the optical fiber filter; the optical fiber filter shapes the spontaneous radiation spectrum generated by the first erbium optical fiber to improve the spectrum flatness; the secondary optical path structure comprises a second erbium optical fiber and an optical fiber coupler; and the second erbium optical fiber enables the spontaneous radiation spectrum of the first-stage output light to work in a long wave part in the whole spectrum range, and transmits the internal light to the optical fiber coupler to output second-stage output light. The requirement for the output power of the pump laser is lowered while the requirement for the spectrum flatness is met and high-power output is achieved.

Description

Technical Field

[0001] The present application relates to the field of optical communication and optical fiber sensing, and in particular to a high-power spontaneous radiation light source. Background Art

[0002] At present, in the field of optical communication and fiber optic sensor technology, high-power spontaneous radiation light output is mainly achieved by increasing the power of the pump laser. At the same time, in order to meet the spectral flatness requirements, a gain flattening filter is generally used. However, the loss of the gain flattening filter is large. The use of this device has high requirements for the pump laser, and a higher pump laser output power is required to meet the requirements of the final output optical power. Therefore, it is difficult for existing high-power spontaneous radiation light sources to reduce the requirements for the pump laser output power while meeting the spectral flatness requirements and achieving high power output. Summary of the invention

[0003] The purpose of the present application is to provide a high-power spontaneous radiation light source, which can reduce the requirements on the output power of the laser while meeting the spectral flatness requirements and achieving high power output.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] The present application provides a high-power spontaneous radiation light source, including: a primary light path structure and a secondary light path structure;

[0006] The primary optical path structure includes a first pump laser, a first erbium optical fiber and an optical fiber filter; the first pump laser is used to emit a first pump light; the first erbium optical fiber is used to absorb the first pump light and generate a spontaneous radiation spectrum, so that the spontaneous radiation spectrum works in the short-wave part of the entire spectrum range, and transmits the internal light to the optical fiber filter; the optical fiber filter is used to shape the spontaneous radiation spectrum transmitted by the first erbium optical fiber and output a primary output light;

[0007] The secondary optical path structure includes a second erbium optical fiber and an optical fiber coupler; the second erbium optical fiber is used to make the spontaneous radiation spectrum of the primary output light work in the long-wave part of the entire spectrum range, and transmit the internal light to the optical fiber coupler; the optical fiber coupler is used to output the secondary output light.

[0008] Optionally, the first-level optical path structure also includes a first wavelength division multiplexer; the first wavelength division multiplexer is arranged on the output optical path of the first pump laser; the first wavelength division multiplexer is connected to the optical fiber filter through the first erbium optical fiber; the first wavelength division multiplexer is used to couple the first pump light into the first erbium optical fiber.

[0009] Optionally, the primary optical path structure further includes a fiber optic reflector; the fiber optic reflector is used to reflect backward light of the primary optical path structure to the first wavelength division multiplexer to increase the power of the primary output light.

[0010] Optionally, the primary optical path structure further includes a first optical fiber isolator; the first optical fiber isolator is arranged between the first erbium optical fiber and the optical fiber filter; the first optical fiber isolator is used to prevent the backward return light of the secondary optical path structure from affecting the spectrum of the primary output light.

[0011] Optionally, the optical fiber filter is a gain flattening filter.

[0012] Optionally, the secondary optical path structure also includes a second wavelength division multiplexer; the second wavelength division multiplexer is arranged on the output optical path of the optical fiber filter; the second wavelength division multiplexer is connected to the optical fiber coupler through the second erbium optical fiber; the second wavelength division multiplexer is used to couple the primary output light into the second erbium optical fiber.

[0013] Optionally, the secondary optical path structure further includes a second pump laser; the second pump laser is used to emit a second pump light to the second wavelength division multiplexer; the second wavelength division multiplexer integrates the primary output light and the second pump light into one light path and couples it into the second erbium optical fiber.

[0014] Optionally, the secondary optical path structure further includes a second optical fiber isolator; the second optical fiber isolator is arranged between the second erbium optical fiber and the optical fiber coupler; the second optical fiber isolator is used to prevent the return light generated by the final output light end face from affecting the spectral flatness of the secondary output light.

[0015] Optionally, the secondary optical path structure further includes a photodetector; and the optical fiber coupler is further used to couple part of the secondary output light into the photodetector.

[0016] Optionally, the length of the first erbium optical fiber is shorter than the length of the second erbium optical fiber.

[0017] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0018] The present application provides a high-power spontaneous radiation light source, wherein the first erbium optical fiber in the primary optical path structure absorbs the first pump light, so that the spontaneous radiation spectrum works in the short-wave part of the entire spectral range, and the light of the spontaneous radiation spectrum generated by the first erbium optical fiber is filtered and shaped by the optical fiber filter. The optical power output by the primary optical path structure is low, and is mainly used to optimize the spontaneous radiation spectrum and meet the spectral flatness requirements. The second erbium optical fiber in the secondary optical path structure makes the spontaneous radiation spectrum of the output light work in the long-wave part of the entire spectral range, and the spectrum is optimized again, and high-power output is achieved. The present application reduces the requirements for the output power of the pump laser while meeting the spectral flatness requirements and achieving high-power output through the cooperation of the primary optical path structure and the secondary optical path structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a high-power spontaneous radiation light source provided in one embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] In an exemplary embodiment, Figure 1 As shown, a high-power spontaneous radiation light source is provided, including: a primary light path structure 10 and a secondary light path structure 20.

[0024] The primary optical path structure 10 is used to make the light source have a good emission spectrum, but the output light power is not high, and the secondary optical path structure 20 is used to increase the output light power.

[0025] The primary optical path structure 10 includes the following components:

[0026] (11) First pump laser 101. The first pump laser 101 is used to emit a first pump light.

[0027] (12) A first wavelength division multiplexer 102. The first wavelength division multiplexer 102 is disposed on the output optical path of the first pump laser 101. The first wavelength division multiplexer 102 is connected to the optical fiber filter 105 via the first erbium optical fiber 103. The first wavelength division multiplexer 102 is used to couple the first pump light into the first erbium optical fiber 103.

[0028] (13) A first erbium fiber 103. The first erbium fiber 103 is used to absorb the first pump light and generate a spontaneous emission spectrum, so that the spontaneous emission spectrum works in the short-wave part of the entire spectrum range, and transmits the internal light to the optical fiber filter 105. In a specific example, the wavelength of the first pump laser 101 is 980nm, the working wavelength of the spontaneous emission spectrum is 1528nm~1565nm, and the first erbium fiber 103 absorbs the first pump light of 980nm and outputs spontaneous emission light of 1528nm~1565nm.

[0029] (14) A first optical fiber isolator 104. The first optical fiber isolator 104 is disposed between the first erbium optical fiber 103 and the optical fiber filter 105. The first optical fiber isolator 104 is used to prevent the backward return light of the secondary optical path structure 20 from affecting the spectrum of the primary output light. The first optical fiber isolator 104 can be provided to protect the first pump laser 101.

[0030] That is, the first wavelength division multiplexer 102 is connected to the optical fiber filter 105 through the first erbium optical fiber 103 and the first optical fiber isolator 104. The first erbium optical fiber 103 first transmits the internal light to the first optical fiber isolator 104, and then transmits it to the optical fiber filter 105 through the first optical fiber isolator 104.

[0031] (15) Optical fiber filter 105. The optical fiber filter 105 is used to filter and shape the light transmitted by the first erbium optical fiber 103 to output primary output light. The optical fiber filter 105 is used to make the primary output light have a good emission spectrum.

[0032] In a specific example, the optical fiber filter 105 is a gain flattening filter.

[0033] (16) Fiber optic reflector 106. The fiber optic reflector 106 is used to reflect the backward light of the primary optical path structure 10 to the first wavelength division multiplexer 102, so as to increase the power of the primary output light.

[0034] The secondary optical path structure 20 includes the following components:

[0035] (21) A second wavelength division multiplexer 201. The second wavelength division multiplexer 201 is disposed on the output optical path of the optical fiber filter 105. The second wavelength division multiplexer 201 is connected to the optical fiber coupler 205 via the second erbium optical fiber 203. The second wavelength division multiplexer 201 is used to couple the primary output light into the second erbium optical fiber 203.

[0036] (22) Second pump laser 202 . The second pump laser 202 is used to emit second pump light to the second wavelength division multiplexer 201 .

[0037] That is, the second wavelength division multiplexer 201 integrates the primary output light and the second pump light into one light and couples it into the second erbium optical fiber 203 .

[0038] (23) A second erbium optical fiber 203 . The second erbium optical fiber 203 is used to make the spontaneous emission spectrum of the primary output light operate in the long-wave portion of the entire spectrum range, and transmit the internal light to the optical fiber coupler 205 .

[0039] (24) A second optical fiber isolator 204. The second optical fiber isolator 204 is disposed between the second erbium optical fiber 203 and the optical fiber coupler 205. The second optical fiber isolator 204 is used to prevent the return light generated by the final output light end face from affecting the spectral flatness of the secondary output light. The second optical fiber isolator 204 can protect the second pump laser 202.

[0040] That is, the second wavelength division multiplexer 201 is connected to the fiber coupler 205 through the second erbium fiber 203 and the second fiber isolator 204. The second erbium fiber 203 first transmits the internal light to the second fiber isolator 204, and then transmits it to the fiber coupler 205 through the second fiber isolator 204.

[0041] (25) Fiber coupler 205. The fiber coupler 205 is used to output secondary output light.

[0042] (26) Photodetector 206 . The optical fiber coupler 205 is also used to couple part of the secondary output light into the photodetector 206 .

[0043] The optical fiber coupler 205 divides a small amount of light into the photodetector 206 as monitoring feedback. The photodetector 206 is used to convert the received optical power into a current signal, and the circuit module performs current-voltage conversion and gain ratio tuning to meet high-precision control while protecting the receiving end analog-to-digital conversion circuit module.

[0044] In the present application, the length of the first erbium optical fiber 103 is shorter than that of the second erbium optical fiber 203. The spontaneous radiation spectra of the two sections of erbium optical fibers of different lengths are different. The second erbium optical fiber 203 makes the spontaneous radiation in the long-wave part while amplifying the short-wave part generated in the first stage, so as to achieve high spectral flatness.

[0045] The primary optical path structure 10 uses a short erbium fiber and a gain flattening filter to optimize the spontaneous emission spectrum, so that the spontaneous emission spectrum mainly works in the short-wave part of the entire spectrum range. Because the insertion loss of the gain flattening filter is large, the output optical power is low. The secondary optical path structure 20 uses a long erbium fiber, which mainly makes the spontaneous emission spectrum work in the long-wave part of the entire spectrum range to achieve high optical power output.

[0046] The high-power spontaneous radiation light source provided by the present application can simultaneously meet the requirements of high optical power and spectral flatness. The optical power output by the primary optical path structure 10 is relatively low, and is mainly used to optimize the spontaneous radiation spectrum. After the primary output light enters the secondary optical path structure 20, the spectrum is optimized again to meet the spectral flatness requirements and achieve high-power output. Moreover, the present application reduces the requirements for the output power of the pump laser through the cooperation of the primary optical path structure 10 and the secondary optical path structure 20.

[0047] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A high-power spontaneous radiation light source, characterized in that: The high-power spontaneous radiation light source comprises: a primary light path structure and a secondary light path structure; The primary optical path structure includes a first pump laser, a first erbium optical fiber and an optical fiber filter; the first pump laser is used to emit a first pump light; the first erbium optical fiber is used to absorb the first pump light and generate a spontaneous radiation spectrum, so that the spontaneous radiation spectrum works in the short-wave part of the entire spectrum range, and transmits the internal light to the optical fiber filter; the optical fiber filter is used to shape the spontaneous radiation spectrum generated by the first erbium optical fiber and output a primary output light; The secondary optical path structure includes a second erbium optical fiber and an optical fiber coupler; the second erbium optical fiber is used to make the spontaneous radiation spectrum of the primary output light work in the long-wave part of the entire spectrum range, and transmit the internal light to the optical fiber coupler; the optical fiber coupler is used to output the secondary output light.

2. The high-power spontaneous radiation light source according to claim 1, characterized in that: The primary optical path structure also includes a first wavelength division multiplexer; the first wavelength division multiplexer is arranged on the output optical path of the first pump laser; the first wavelength division multiplexer is connected to the optical fiber filter through the first erbium optical fiber; the first wavelength division multiplexer is used to couple the first pump light into the first erbium optical fiber.

3. The high-power spontaneous radiation light source according to claim 2, characterized in that: The primary optical path structure also includes a fiber optic reflector; the fiber optic reflector is used to reflect the backward light of the primary optical path structure to the first wavelength division multiplexer to increase the power of the primary output light.

4. The high-power spontaneous radiation light source according to claim 1, characterized in that: The primary optical path structure also includes a first optical fiber isolator; the first optical fiber isolator is arranged between the first erbium optical fiber and the optical fiber filter; the first optical fiber isolator is used to prevent the backward return light of the secondary optical path structure from affecting the spectrum of the primary output light.

5. The high-power spontaneous radiation light source according to claim 1, characterized in that: The optical fiber filter is a gain flattening filter.

6. The high-power spontaneous radiation light source according to claim 1, characterized in that: The secondary optical path structure also includes a second wavelength division multiplexer; the second wavelength division multiplexer is arranged on the output optical path of the optical fiber filter; the second wavelength division multiplexer is connected to the optical fiber coupler through the second erbium optical fiber; the second wavelength division multiplexer is used to couple the primary output light into the second erbium optical fiber.

7. The high-power spontaneous radiation light source according to claim 6, characterized in that: The secondary optical path structure also includes a second pump laser; the second pump laser is used to emit a second pump light to the second wavelength division multiplexer; the second wavelength division multiplexer integrates the primary output light and the second pump light into one light path and couples it into the second erbium optical fiber.

8. The high-power spontaneous radiation light source according to claim 1, characterized in that: The secondary optical path structure also includes a second optical fiber isolator; the second optical fiber isolator is arranged between the second erbium optical fiber and the optical fiber coupler; the second optical fiber isolator is used to prevent the return light generated by the final output light end face from affecting the spectral flatness of the secondary output light.

9. The high-power spontaneous radiation light source according to claim 1, characterized in that: The secondary optical path structure also includes a photodetector; the optical fiber coupler is also used to couple part of the secondary output light into the photodetector.

10. The high-power spontaneous radiation light source according to claim 1, characterized in that: The length of the first erbium optical fiber is shorter than the length of the second erbium optical fiber.

Images