CN114336256A - Multi-pass amplification multiplexing polarization-maintaining ASE light source device - Google Patents
Multi-pass amplification multiplexing polarization-maintaining ASE light source device Download PDFInfo
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- CN114336256A CN114336256A CN202111446584.1A CN202111446584A CN114336256A CN 114336256 A CN114336256 A CN 114336256A CN 202111446584 A CN202111446584 A CN 202111446584A CN 114336256 A CN114336256 A CN 114336256A
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Abstract
The invention discloses a multi-pass amplification multiplexing polarization-maintaining ASE light source device, which comprises a pumping signal beam combiner, a pumping source, a Faraday rotary mirror, a gain optical fiber, a polarization beam splitter, a high-reflectivity fiber Bragg grating and a polarization-maintaining optical isolator, wherein the pumping source, the Faraday rotary mirror and the gain optical fiber are respectively connected with a pumping end, a signal end and a public end of the pumping signal beam combiner through passive optical fibers; based on the polarization characteristics of the polarization beam splitter and the Faraday rotator, the invention enables ASE light with different transmission directions and different polarization directions to be in the same polarization state after being adjusted by the polarization state for different times, and the ASE light is polarized and emitted by the polarization beam splitter together to obtain linear polarization output.
Description
Technical Field
The invention belongs to the technical field of optical fiber sensing and optical device measurement, and particularly relates to a multi-pass amplification multiplexing polarization-maintaining ASE light source device.
Background
An ASE light source generated by Amplified Spontaneous Emission (ASE) can generate a broad spectrum output with a wavelength range of ten nanometers to hundred nanometers, is a mainstream technical scheme of the current broad spectrum light source, and is commonly used for applications such as optical fiber sensing systems and passive optical device tests. Compared with other wide-spectrum light sources such as Light Emitting Diodes (LEDs), ASE light sources have the characteristics of high spectral stability and low temporal coherence, and are easily and effectively coupled with an optical fiber system.
The traditional ASE light source generally adopts the technical scheme of a pumping optical fiber ring, namely, the optical fiber ring is formed by connecting two ports on the same side of an optical fiber coupler, and the ASE light is obtained in the optical fiber ring based on the fiber core pumping technology. The polarization state of the output of the traditional ASE light source is random and generally has low power, so that the traditional ASE light source is difficult to be used for accurately testing the spectral characteristics of the polarization-maintaining passive device.
The existing polarization-maintaining ASE light source obtains linear polarization output by adopting a polarizing film polarizing mode, polarization components different from the polarizing direction are directly lost, the energy utilization rate is reduced, and the output power is difficult to further improve.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a multi-pass amplification multiplexing polarization-maintaining ASE light source device to realize low-loss polarization and improve the energy utilization rate of the ASE light source, thereby further improving the purpose of output power.
The technical scheme adopted by the invention for solving the technical problems is as follows: the multi-pass amplification multiplexing polarization-maintaining ASE light source device comprises a pumping signal beam combiner, a pumping source, a Faraday rotary mirror and a gain optical fiber, wherein the pumping source, the Faraday rotary mirror and the gain optical fiber are respectively connected with a pumping end, a signal end and a public end of the pumping signal beam combiner through passive optical fibers, the polarization beam splitter further comprises a high-reflectivity fiber Bragg grating and a polarization-maintaining optical isolator, the high-reflectivity fiber Bragg grating and the polarization-maintaining optical isolator are respectively connected with a horizontal polarization (p wave) output end and a vertical polarization (s wave) output end of the polarization beam splitter through the passive optical fibers, the input end of the polarization beam splitter is connected with the other end of the gain optical fiber through the passive optical fibers, and the output end of the polarization-maintaining optical isolator serves as the output end of a polarization-maintaining ASE light source.
Furthermore, the pump signal combiner is a Multimode Pump Combiner (MPC), the type is (2+1) × 1, the signal end and common end tail fibers are passive double-clad fibers, the diameter of the fiber core is 10 μm, the diameter of the inner cladding is 125 μm, the pump end tail fiber is a multimode fiber, the diameter of the fiber core is 105 μm, the diameter of the cladding is 125 μm, and the numerical aperture of the fiber core is 0.22.
The pump source is a multimode pump source, and the multimode pump source is a semiconductor laser with a pump wavelength of 976 nm.
The gain fiber is an active double-clad YDF, the diameter of the fiber core is 10 microns, the diameter of the inner cladding is 125 microns, the numerical aperture of the fiber core is 0.08, the length of the fiber is 5m, and the input end, the horizontal polarization output end and the vertical polarization output end of the polarization beam splitter are respectively connected with the gain fiber, the high-reflectivity fiber Bragg grating and the polarization-maintaining optical isolator through passive double-clad fibers.
The Faraday rotator mirror, the multimode pump beam combiner, the gain fiber, the polarization beam splitter, the high-reflectivity fiber Bragg grating, the polarization-maintaining optical isolator and the multimode pump source are connected in a fusion mode.
Further, the pump signal combiner is a Wavelength Division Multiplexer (WDM) with type 980/1550, the signal end and common end tail fiber are passive single mode fiber, the diameter of the fiber core is 6 μm, the diameter of the inner cladding is 125 μm, and the pump end tail fiber is single mode fiber.
The pump source is a single-mode pump source, and the single-mode pump source is a semiconductor laser with the pump wavelength of 980 nm.
The gain fiber is an active single-mode EDF, the diameter of a fiber core is 6 microns, the diameter of an inner cladding is 125 microns, the numerical aperture of the fiber core is 0.08, the length of the fiber is 5m, and the input end, the horizontal polarization output end and the vertical polarization output end of the polarization beam splitter are respectively connected with the gain fiber, the high-reflectivity fiber Bragg grating and the polarization-maintaining optical isolator through passive single-mode fibers.
The Faraday rotator mirror, the wavelength division multiplexer, the gain optical fiber, the polarization beam splitter, the high-reflectivity fiber Bragg grating, the polarization-maintaining optical isolator and the single-mode pump source are connected in a fiber flange butt joint mode.
Compared with the prior art, the invention has the advantages that:
according to the polarization beam splitter and Faraday rotator, based on the polarization characteristics of the polarization beam splitter and the Faraday rotator, ASE light in different transmission directions and different polarization directions is adjusted to be in the same polarization state for different times, and is polarized and emitted through the polarization beam splitter together to obtain linear polarization output; compared with the prior art, the polarization component that is different from the polarization direction in polarization can not be directly lost, and the polarization component can be reused after being adjusted by different times of amplification strokes and polarization states, so that the polarization loss of the system is reduced; and secondly, the polarization loss is reduced, the energy utilization rate is improved, and the required pumping power can be reduced, so that the space for further improving the output power of the polarization-maintaining ASE light source is provided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
The figures are numbered: the optical fiber laser comprises a Faraday rotating mirror 1, a pump signal beam combiner 2, a gain optical fiber 3, a polarization beam splitter 4, a high-reflectivity fiber Bragg grating 5, a polarization-maintaining optical isolator 6 and a pump source 8.
Detailed Description
The present invention will be further explained below with reference to specific examples and drawings, but is not limited to the embodiments.
Referring to fig. 1, the polarization-maintaining ASE light source device for multi-pass amplification multiplexing disclosed by the invention comprises a faraday rotating mirror 1, a pumping signal beam combiner 2, a gain fiber 3, a polarization beam splitter 4, a high-reflectivity fiber bragg grating 5, a polarization-maintaining optical isolator 6 and a pumping source 8; the pumping end, the signal end and the common end of the pumping signal combiner 2 are respectively connected with a pumping source 8, a Faraday rotation mirror 1 and a gain optical fiber 3; the input end, the horizontal polarization (p wave) output end and the vertical polarization (s wave) output end of the polarization beam splitter 4 are respectively connected with the other end of the gain fiber 3, the high-reflectivity fiber Bragg grating 5 and the polarization-maintaining optical isolator 6; the output end of the polarization-maintaining optical isolator 6 is used as the output end of the polarization-maintaining ASE light source.
According to the invention, a pumping source 8 pumps an active fiber, namely a gain fiber 3 generates ASE light output, spontaneous radiation light with different transmission directions and different polarization directions is reflected by a Faraday rotator 1 and a high-reflectivity fiber Bragg grating 5, amplified by the gain fiber 3 for one time or multiple times and adjusted in polarization state by the Faraday rotator 1, finally, ASE light amplified in different strokes is in the same polarization state, is polarized and emitted by a polarization beam splitter 4 together, and is output as linearly polarized ASE light after passing through a polarization maintaining isolator 6.
Example 1
As shown in fig. 2, the multi-pass amplification multiplexing polarization-maintaining ASE light source device provided by the present invention includes:
the optical fiber polarization beam splitter comprises a multimode pump beam combiner serving as a pump signal beam combiner 2, a pump source 8, a Faraday rotary mirror 1 and a gain optical fiber 3 which are respectively connected with a pump end, a signal end and a common end of the multimode pump beam combiner through passive optical fibers, a polarization beam splitter 4, a high-reflectivity fiber Bragg grating 5 and a polarization-maintaining optical isolator 6 which are respectively connected with a horizontal polarization (p wave) output end and a vertical polarization (s wave) output end of the polarization beam splitter 4 through the passive optical fibers, and an input end of the polarization beam splitter 4 is connected with the other end of the gain optical fiber 3 through the passive optical fibers.
The multimode pump beam combiner (MPC) is of the type of (2+1) multiplied by 1, the signal end and the public end tail fiber are passive double-clad optical fibers, the fiber core diameter is 10 mu m, and the inner cladding diameter is 125 mu m; the tail fiber at the pumping end is a multimode fiber, the diameter of the fiber core is 105 mu m, the diameter of the cladding is 125 mu m, and the numerical aperture of the fiber core is 0.22.
The pump source 8 is a multimode pump source, the multimode pump source 8 is a semiconductor laser, the pump wavelength of the semiconductor laser is 976nm, and the semiconductor laser is used for pumping an active double-cladding YDF (YDF), namely the gain fiber 3, and generating 1 mu mASE light output in different transmission directions and different polarization directions.
The gain fiber 3 is an active double-cladding YDF, the diameter of a fiber core of the active double-cladding YDF is 10 mu m, the diameter of an inner cladding is 125 mu m, the numerical aperture of the fiber core is 0.08, and the length of the fiber is 5 m; the input end, the horizontal polarization (p wave) output end and the vertical polarization (s wave) output end of the polarization beam splitter 4 are respectively connected with the other end of the gain fiber 3, the high-reflectivity fiber Bragg grating 5 and the polarization-maintaining optical isolator 6 through the passive double-clad fiber, and the output end of the polarization-maintaining optical isolator 6 is used as the output end of the polarization-maintaining ASE light source.
The faraday rotator mirror 1 is used to adjust the polarization state of its reflected light such that it is rotated by 90 ° compared to the polarization direction before incidence. The polarization beam splitter 4 is used for separating two polarization components in orthogonal directions, wherein light (s wave) in one polarization direction is emitted in a linear polarization manner to realize a polarization function, and light (p wave) in the other polarization direction is guided to the high-reflectivity fiber bragg grating 5 from the other port. The high-reflectivity fiber Bragg grating 5 is used for reflecting light at the horizontal polarization (p wave) output end of the polarization beam splitter 4 without changing the polarization state of the light; the reflectivity of the fiber reaches 99.9%, and the end face of the tail fiber in the other direction is inclined by 8 degrees and is plated with an anti-reflection film. And the polarization-maintaining optical isolator 6 is used for obtaining the output linearly polarized 1 mu m ASE light (s wave) and isolating the stray light reflected back from the output end.
The multimode pump source, the Faraday rotation mirror 1, the multimode pump beam combiner, the gain fiber 3, the polarization beam splitter 4, the high-reflectivity fiber Bragg grating 5 and the polarization-maintaining optical isolator 6 are connected in a fusion mode.
Finally, the ASE light amplified in different strokes is in the same polarization state, is polarized and emitted through the polarization beam splitter 4, and is output after passing through the polarization-maintaining optical isolator 6 to obtain linearly polarized 1-micron ASE light.
Example 2
As shown in fig. 3, the multi-pass amplified multiplexed polarization-maintaining ASE light source device provided by the present invention includes:
the high-reflectivity optical fiber Bragg grating polarization maintaining optical isolator comprises a wavelength division multiplexer serving as a pumping signal combiner 2, a pumping source 8, a Faraday rotary mirror 1 and a gain optical fiber 3 which are respectively connected to a pumping end, a signal end and a public end of the wavelength division multiplexer through passive optical fibers, a polarization beam splitter 4, a high-reflectivity optical fiber Bragg grating 5 and a polarization maintaining optical isolator 6 which are respectively connected to a horizontal polarization (p wave) output end and a vertical polarization (s wave) output end of the polarization beam splitter 4 through the passive optical fibers, and an input end of the polarization beam splitter 4 is connected with the other end of the gain optical fiber 3 through the passive optical fibers.
The Wavelength Division Multiplexer (WDM) is 980/1550, the signal end and common end tail fiber are passive single mode fiber, the fiber core diameter is 6 μm, and the inner cladding diameter is 125 μm; the pumping end tail fiber is a single mode fiber, and the diameter of the fiber core, the diameter of the cladding and the numerical aperture of the fiber core are the same as those of the pumping source 8 tail fiber.
The pump source 8 is a single-mode pump source, the single-mode pump source is a semiconductor laser, the pump wavelength of the semiconductor laser is 980nm, and the semiconductor laser is used for pumping active single-mode EDF (erbium doped fiber), namely the gain fiber 3, and generating 1.5 mu mASE (micro-nano-array antenna) light output in different transmission directions and different polarization directions.
The gain fiber 3 is an active single-mode EDF, the diameter of a fiber core of the active single-mode EDF is 6 mu m, the diameter of an inner cladding is 125 mu m, the numerical aperture of the fiber core is 0.08, and the length of the fiber is 5 m. The faraday rotator mirror 1 is used to adjust the polarization state of its reflected light such that it is rotated by 90 ° compared to the polarization direction before incidence. The polarization beam splitter 4 is used for separating two polarization components in orthogonal directions, wherein light (s wave) in one polarization direction is emitted in a linear polarization manner to realize a polarization function, and light (p wave) in the other polarization direction is guided to the high-reflectivity fiber bragg grating 5 from the other port. The high-reflectivity fiber Bragg grating 5 is used for reflecting light at the horizontal polarization (p wave) output end of the polarization beam splitter 4 without changing the polarization state of the light; the reflectivity of the fiber reaches 99.9%, and the end face of the tail fiber in the other direction is inclined by 8 degrees and is plated with an anti-reflection film. The polarization-maintaining optical isolator 6 is used for obtaining output linearly polarized 1.5 μm ASE light (s wave) and isolating stray light reflected back from the output end.
The gain fiber 3 is an active single-mode EDF, the diameter of a fiber core of the active single-mode EDF is 6 mu m, the diameter of an inner cladding is 125 mu m, the numerical aperture of the fiber core is 0.08, and the length of the fiber is 5 m. The input end, the horizontal polarization (p wave) output end and the vertical polarization (s wave) output end of the polarization beam splitter 4 are respectively connected with the other end of the gain fiber 3, the high-reflectivity fiber Bragg grating 5 and the polarization-maintaining optical isolator 6 through the passive single-mode fiber, and the output end of the polarization-maintaining optical isolator 6 is used as the output end of the polarization-maintaining ASE light source.
Finally, the ASE light amplified in different strokes is in the same polarization state, is polarized and emitted through the polarization beam splitter 4, and is output after passing through the polarization-maintaining optical isolator 6 to obtain linearly polarized 1.5 mu m ASE light.
The single-mode pump source, the Faraday rotary mirror 1, the wavelength division multiplexer, the gain fiber 3, the polarization beam splitter 4, the high-reflectivity fiber Bragg grating 5 and the polarization-maintaining optical isolator 6 are connected in a fiber flange butt joint mode.
The above embodiments are merely illustrative of the principles and effects of the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (9)
1. A multi-pass amplification multiplexing polarization-maintaining ASE light source device is characterized in that: the polarization beam splitter comprises a pumping signal beam combiner (2), a pumping source (8), a Faraday rotary mirror (1) and a gain optical fiber (3), wherein the pumping source (8), the Faraday rotary mirror (1) and the gain optical fiber (3) are connected to a pumping end, a signal end and a public end of the pumping signal beam combiner (2) through passive optical fibers respectively, the polarization beam splitter (4) further comprises a high-reflectivity fiber Bragg grating (5) and a polarization-preserving optical isolator (6), the high-reflectivity fiber Bragg grating (5) and the polarization-preserving optical isolator are connected to a horizontal polarization output end and a vertical polarization output end of the polarization beam splitter (4) through the passive optical fibers respectively, the input end of the polarization beam splitter (4) is connected with the gain optical fiber (3) through the passive optical fibers, and the output end of the polarization-preserving optical isolator (6) serves as an output end of an ASE light source.
2. The ASE light source device of claim 1, wherein the pump signal combiner (2) is a multimode pump combiner of type (2+1) × 1, the signal end and common end pigtails are passive double-clad fibers, the core diameter is 10 μm, the inner cladding diameter is 125 μm, the pump end pigtails are multimode fibers, the core diameter is 105 μm, the cladding diameter is 125 μm, and the core numerical aperture is 0.22.
3. The device as claimed in claim 2, wherein the pump source (8) is a multimode pump source, and the multimode pump source is a semiconductor laser with a pump wavelength of 976 nm.
4. The ASE light source device of claim 2 or 3, wherein the gain fiber (3) is active double-clad YDF, the core diameter is 10 μm, the inner cladding diameter is 125 μm, the core numerical aperture is 0.08, the fiber length is 5m, and the input end, the horizontal polarization output end and the vertical polarization output end of the polarization beam splitter (4) are respectively connected with the gain fiber (3), the high-reflectivity fiber Bragg grating (5) and the polarization-maintaining optical isolator (6) through passive double-clad fibers.
5. The multiple-pass amplified multiplexed polarization-maintaining ASE light source device as claimed in claim 4, wherein the faraday rotator mirror (1), the multimode pump combiner, the gain fiber (3), the polarization beam splitter (4), the high-reflectivity fiber bragg grating (5), the polarization-maintaining optical isolator (6) and the multimode pump source are connected by fusion.
6. The ASE light source device according to claim 1, wherein the pump signal combiner (2) is a wavelength division multiplexer of type 980/1550, and the signal end and common end pigtails are passive single mode fibers with a core diameter of 6 μm, an inner cladding diameter of 125 μm, and the pump end pigtails are single mode fibers.
7. The multiple-pass amplified multiplexed polarization-maintaining ASE light source device as claimed in claim 6, wherein the pump source (8) is a single-mode pump source, and the single-mode pump source is a semiconductor laser with a pump wavelength of 980 nm.
8. The ASE light source device of claim 6 or 7, wherein the gain fiber (3) is an active single mode EDF, the diameter of the fiber core is 6 μm, the diameter of the inner cladding is 125 μm, the numerical aperture of the fiber core is 0.08, the length of the fiber is 5m, and the input end, the horizontal polarization output end and the vertical polarization output end of the polarization beam splitter (4) are respectively connected with the gain fiber (3), the high-reflectivity fiber Bragg grating (5) and the polarization-maintaining optical isolator (6) through passive single mode fibers.
9. The ASE light source device of claim 8, wherein the faraday rotator (1), the wavelength division multiplexer, the gain fiber (3), the polarization beam splitter (4), the high-reflectivity fiber bragg grating (5), the polarization-maintaining optical isolator (6) and the single-mode pump source are connected by fiber flange butt joint.
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