CN113078535A - All-fiber structure switchable C/L waveband amplified spontaneous radiation light source system - Google Patents
All-fiber structure switchable C/L waveband amplified spontaneous radiation light source system Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08059—Constructional details of the reflector, e.g. shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
Abstract
The invention discloses a switchable C/L waveband amplified spontaneous emission light source system with an all-fiber structure, which is characterized by comprising a C waveband generating device and an L waveband generating device, wherein pumping light enters the C waveband generating device or the L waveband generating device through a first optical switch to realize C/L/C + L waveband switching. The tunable ASE light source has the advantages of simple switching structure, simpler structure compared with the conventional tunable ASE light source, strong stability, reduced cost and realization of the function of switching the wave band.
Description
Technical Field
The invention relates to the technical field of optical fiber communication and optical fiber sensing, in particular to a switchable L, C + L waveband Amplified Spontaneous Emission (ASE) light source.
Background
In recent years, with the popularization of various communication products, the requirement on communication capacity is higher and higher, and gradually, the conventional C-band broadband light source cannot meet the requirement of people on bandwidth, and people immediately put eyes on an L-band which is longer than the C-band. At present, the leading idea of realizing broadband and ultra-wideband amplification is to combine the amplifiers of each band. In the research of erbium-doped fiber broadband ASE light sources with various structures, researchers found that the output spectrum pattern of a C + L band broadband ASE light source is mostly uneven without adding a Gain Flattening Filter (GFF), and a peak exists around 1535nm, which is caused by the characteristics of erbium ions. If the problem is not solved, the gain power difference between the peak of the output spectrum and other positions will be very large, and the usable bandwidth and flatness of the output spectrum as a whole will be seriously affected. Similarly, in the field of the ASE light source, the output power of the C waveband is often high, the power of the C + L waveband is small, the application field of the L waveband is continuously widened, and if a single ASE light source is used, the output of the C, L and C + L wavebands can be realized, so that the application field of the ASE light source can be greatly improved. Therefore, the simple tuning device is designed to tune the wave band of the laser in the C, L, C + L wave bands, and has strong practical value.
Disclosure of Invention
Therefore, in order to realize an ASE light source which is switched among C, L, C + L wave bands under the condition of not adding GFF, the invention provides a novel switchable L, C + L wave band Amplified Spontaneous Emission (ASE) light source. Based on the working principle of amplified spontaneous radiation, the Er-doped fiber laser adopts a mature commercial fiber amplifier and a more common single-mode fiber core pumping structure, respectively utilizes the gain characteristics of the Er-doped fiber, and under the condition that a pumping laser provides pumping (pumping) energy3+Ion absorptionThe pump light forms a particle number inversion process that in turn produces an Amplified Spontaneous Emission (ASE) light output. The switching of the working waveband can be realized by adjusting the optical switch path, and finally, ASE optical output with stable output power, good spectral flatness and switchable waveband is realized. The technical proposal is that the method comprises the following steps,
a full-optical-fiber-structure switchable C/L waveband amplified spontaneous emission light source system comprises a C waveband generation device and an L waveband generation device, wherein pumping light enters the C waveband generation device or the L waveband generation device through a first optical switch; the L-band generating device comprises a first wavelength division multiplexer, an optical isolator and an optical circulator, pump light sequentially passes through the first wavelength division multiplexer, a first section of low erbium-doped optical fiber and a first optical fiber reflector, then sequentially enters the optical isolator and the optical circulator through the first wavelength division multiplexer, is output by the optical circulator, sequentially enters a second section of low erbium-doped optical fiber and a second optical fiber reflector, returns to the optical circulator through the second optical fiber reflector, and is output to the first optical fiber coupler through the optical circulator to output L-band light; the C-band generating device comprises a second wavelength division multiplexer, a third optical fiber reflector and a third section of low erbium-doped optical fiber, and pump light sequentially passes through the second wavelength division multiplexer, the third section of low erbium-doped optical fiber and the third optical fiber reflector, enters the second wavelength division multiplexer from the third optical fiber reflector, then enters the first optical fiber coupler and outputs C-band light.
The pump light enters the C-band generating device through the second optical fiber coupler and enters the L-band generating device through the third optical fiber coupler; the pump light realizes the switching among the L-waveband light, the C-waveband light and the C + L-waveband light through the first optical switch and the second optical switch.
Further, generating the L-band light includes the steps of:
s1, pump light is generated by a laser diode, enters a third optical fiber coupler through a first optical switch, sequentially enters a first wavelength division multiplexer, a first section of low erbium-doped optical fiber and a first optical fiber reflector through the third optical fiber coupler, and enters an optical isolator through the first wavelength division multiplexer through the first optical fiber reflector;
s2.C waveband light enters the optical circulator through the optical isolator, is output by the optical circulator, sequentially enters the second section of low erbium-doped optical fiber and the second optical fiber reflector, and enters the optical circulator through the second optical fiber reflector;
and S3, the L-band light enters the first optical fiber coupler through the optical circulator, and the first optical fiber coupler outputs the L-band light.
Further, generating the C-band light includes the steps of:
s1, pump light is generated by a laser diode, enters a second optical fiber coupler through a first optical switch, and enters a second wavelength division multiplexer, a third section of low erbium-doped optical fiber and a third optical fiber reflector in sequence through selection of the second optical switch, and passes through the second wavelength division multiplexer by the third optical fiber reflector;
and S2, the C-band light enters the first optical fiber coupler through the second wavelength division multiplexer and is output.
Further, generating the C + L band light includes the steps of:
s1, pump light is generated by a laser diode and enters a second optical fiber coupler and a third optical fiber coupler simultaneously through a first optical switch;
s2, pumping light enters a third optical fiber coupler from one part of the second optical fiber coupler through a second optical switch, and the other part of the pumping light enters a second wavelength division multiplexer; the light of C wave band enters the optical circulator through the optical isolator, and after being output by the optical circulator, the light enters the second section of low erbium-doped optical fiber and the second optical fiber reflector in sequence, and enters the optical circulator through the second optical fiber reflector; meanwhile, the pump light output by the second wavelength division multiplexer sequentially passes through the third section of low erbium-doped fiber and the third fiber reflector, and is output by the third fiber reflector through the second wavelength division multiplexer;
and S3, coupling the light from the optical circulator and the light from the second wavelength division multiplexer through the first optical fiber coupler and then outputting C + L section light.
Furthermore, the switching method of the output light of the ASE light of the C wave band and the L wave band is that,
the pumping light is switched through the first light switch, the second light switch is always closed, and the first light switch determines whether the pumping light firstly passes through the L-band generating device or the C-band generating device;
when the light passes through the L-band generating device, no pumping light is injected into the C-band generating device, so that the output light is L-band ASE light;
when the pump light passes through the C-band generation device, the pump light is injected into the C-band generation device, the L-band generation device is not injected with the pump light, the ASE light output of the C-band is realized, and the switching of the output light of the ASE light of the C, L bands is realized.
Furthermore, the switching method of the output light of the ASE light of C + L wave band and L wave band is that,
the pump light is switched through a first light switch, and the first light switch determines whether the pump light firstly passes through the second optical fiber coupler or the third optical fiber coupler;
when the light passes through the third optical fiber coupler, the light bypasses the second optical fiber coupler, so that no pump light is injected into the second part, and the output light is L-waveband ASE light;
when the pumping light passes through the second optical fiber coupler, the pumping light is divided into two paths, at the moment, the second light is switched on, one path of pumping L-waveband generating device and the other path of pumping C-waveband generating device are finally coupled and output at the first optical fiber coupler, the output of ASE light of C + L waveband is realized, and the switching of the output light of the ASE light of L and C + L wavebands is realized.
The switching method of the output light of the ASE light of C + L wave band and C wave band is that,
the pump light path enters the second optical fiber coupler through the first optical switch and is switched by the second optical switch, and the second optical switch determines whether the pump light simultaneously passes through the third optical fiber coupler and the second wavelength division multiplexer or independently enters the second wavelength division multiplexer;
simultaneously enters a third optical fiber coupler and a second wavelength division multiplexer to realize ASE optical output of C + L wave band; independently enter a second wavelength division multiplexer to realize the output of the ASE light of the C wave band, thereby realizing the switching of the output light of the ASE light of the C wave band and the C + L wave band
Furthermore, the amplified spontaneous emission light source system is of an all-fiber structure and can switch C/L/C + L wave bands.
Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
1) by adopting a wave band combination method, the pumping light path of the LD is changed by opening light, so that the single LD generates light with C and L wave bands, and the output light wave band is selected. And the spectral flatness is high without adding a gain flattening filter;
2) the invention has simple switching structure, simpler structure and strong stability compared with the prior tunable ASE light source, and realizes the function of switching wave bands while reducing the cost.
3) The invention uses the all-fiber structure, has stable structure, is not easily interfered by the external environment, and adopts the fiber reflector to reflect ASE light for secondary amplification, thereby improving the pumping efficiency.
Drawings
FIG. 1 is a schematic diagram of an C, L, C + L band switchable ASE light source system;
FIG. 2 is a graph of the output L-band spectrum;
FIG. 3 is a chart of the output C + L band spectrum;
FIG. 4 is a schematic diagram of an C, L waveband switchable ASE light source system;
wherein 1, a first Optical Fiber Reflector (OFR)2, a first section of low erbium-doped fiber (EDF)3, a first Wavelength Division Multiplexer (WDM)4, an Optical Isolator (ISO)5, a second section of low erbium-doped fiber 6, a second Optical Fiber Reflector (OFR)7, an Optical Circulator (OC)8, a 1 × 2 first Optical fiber coupler 9, a third Optical Fiber Reflector (OFR)10, a third section of low erbium-doped fiber (EDF)11, a second Wavelength Division Multiplexer (WDM)12, a first 1 × 2 Optical Switch (Optical Switch)13, a 976nm Laser Diode (LD)14, a second 1 × 2 Optical fiber coupler 15 and a third 1 × 2 Optical fiber coupler; 16. a second optical switch.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The present example provides a structure of L, C or C + L band switched ASE light source based on optical switch regulation as shown in fig. 1, which includes three parts: the first part is an L-band generating device which consists of a first optical fiber reflector 1, a first section of low erbium-doped optical fiber 2, a first wavelength division multiplexer (980/1550)3, an optical isolator 4, a second section of low erbium-doped optical fiber 5, a second optical fiber reflector 6, an optical circulator 7 and a first 1 multiplied by 2 optical fiber coupler 8. The second part is a C-band generating device which consists of a third optical fiber reflector 9, a third section of low erbium-doped optical fiber 10 and a second wavelength division multiplexer 11, and the third part is a pump light and band switching device which consists of a first 1 x 2 optical switch 12, a 976nm laser diode 13, a second 1 x 2 optical fiber coupler 14, a third 1 x 2 optical fiber coupler 15 and a second optical switch 16.
The pump light comprises a 976nm laser diode and a pigtail, the central wavelength of the 976nm laser diode is 976nm, the pump light is a single-mode pump, the average power is more than 300mW, and the pigtail is a single-mode optical fiber.
The splitting ratios of the first 1 × 2 optical fiber coupler 8, the second 1 × 2 optical fiber coupler 14, and the third 1 × 2 optical fiber coupler 15 are all 50: 50 and has high transmittance to S + C + L wave band.
The first wavelength division multiplexer 3 and the second wavelength division multiplexer 11 are 976/1550 in type, and the first wavelength division multiplexer and the second wavelength division multiplexer have two output ends, three-section end tail fiber, wherein the tail fiber is single mode fiber, one end is 1550 end, and the other end is 976 end.
The first section of low erbium-doped fiber 2 and the second section of low erbium-doped fiber 5 adopt MP980 fibers of OFS company, the fiber core and the cladding of the fibers are respectively 7 mu m/125 mu m, the secondary absorption efficiency of the L waveband is obviously improved by utilizing the first fiber reflector 1 and the second fiber reflector 7, and the length of the used EDF is shortened.
The first low Erbium Doped Fiber (EDF) described in this example has a length of 13.3m and an absorption of 6dB/m at 976 nm.
The length of the second EDF in this embodiment is 90m, and the absorbance at 976nm is 6 dB/m.
The length of the third EDF in this embodiment is 7.5m, and the absorbance at 976nm is 6 dB/m.
In this embodiment, the central wavelength of the first fiber mirror and the second fiber mirror is 1570nm, the bandwidth is 100nm, and the transmittance is not less than 90%.
The central wavelength of the optical fiber circulator 8 described in this embodiment is 1580nm, and the optical fiber circulator has high transmittance in the S + C + L waveband.
When the optical switch described in this embodiment is turned off, the transmittance thereof is-30 dB.
Generating the L-band light comprises the steps of:
s1, pump light is generated by a 976nm laser diode 13, enters a third 1 x 2 optical fiber coupler 15 through a first 1 x 2 optical switch 12, is turned off at the moment, enters a first wavelength division multiplexer 3, a first section of low erbium-doped optical fiber 2 and a first optical fiber reflector 1 from the third 1 x 2 optical fiber coupler 15 in sequence, is reflected by the first optical fiber reflector 1, then passes through the first section of low erbium-doped optical fiber 2, and then enters an optical isolator 4 through the first wavelength division multiplexer 3;
s2.C waveband light enters an optical circulator 7 through an optical isolator 4, is output by the optical circulator 7, sequentially enters a second section of low erbium-doped optical fiber 5 and a second optical fiber reflector 6, and enters the optical circulator 7 again through the second optical fiber reflector 6;
and S3. the L-band light enters the first 1 x 2 optical fiber coupler 8 through the optical circulator 7, and the first 1 x 2 optical fiber coupler 8 outputs the L-band light.
Generating the C-band light includes the steps of:
s1, pump light is generated by a laser diode 13, the pump light enters a second 1 x 2 optical fiber coupler 14 through a first 1 x 2 optical switch 12, at the moment, a second optical switch 16 is closed, the light sequentially enters a second wavelength division multiplexer 11, a third section of low erbium-doped optical fiber 10 and a third optical fiber reflector 9 through the second 1 x 2 optical fiber coupler 14 and the second optical switch 16, and passes through the second wavelength division multiplexer 11 through the third optical fiber reflector 9;
and S2.C band light enters the first 1 multiplied by 2 optical fiber coupler 8 through the second wavelength division multiplexer 11 and is output.
Generating the C + L band light comprises the steps of:
s1, pump light is generated by a laser diode 13, the pump light simultaneously enters a second 1 × 2 optical fiber coupler 14 and a third 1 × 2 optical fiber coupler 15 through a first 1 × 2 optical switch 12, and at the moment, a second optical switch 16 is opened;
s2, pumping light enters a third optical fiber coupler 15 from one part of a second optical fiber coupler 14 through a second optical switch 16, and the other part of the pumping light enters a second wavelength division multiplexer 11; the light of the C waveband enters the optical circulator 7 through the optical isolator 4, is output by the optical circulator 7, then enters the second section of low erbium-doped optical fiber 5 and the second optical fiber reflector 6 in sequence, and enters the optical circulator 7 through the second optical fiber reflector 6; meanwhile, the C-band light output by the second wavelength division multiplexer 11 sequentially passes through a third section of low erbium-doped fiber 10 and a third fiber reflector 9, and is output by the third fiber reflector 9 through the second wavelength division multiplexer 11;
and S3, coupling the light from the optical circulator 7 and the light from the second wavelength division multiplexer 11 by the first 1X 2 optical fiber coupler 8 and then outputting C + L section light.
the pump light beam emitted by the pump light described in this embodiment enters the first section of low erbium-doped fiber and the second section of low erbium-doped fiber of the first portion through the first wavelength division multiplexer to be pumped, so as to form an output in an L-band.
The pump light beam emitted by the pump light described in this embodiment enters the first low erbium-doped fiber and the third section of low erbium-doped fiber through the first wavelength division multiplexer and the second wavelength division multiplexer of the second portion, respectively, and is pumped, so as to form an output in a C + L band.
In the third part, the pump light path is switched by a first optical switch 12, and the first optical switch 12 determines whether the pump light first passes through a second 1 × 2 fiber coupler 14 or a third 1 × 2 fiber coupler 15. When passing through the third 1 × 2 fiber coupler 15, it bypasses the second 1 × 2 fiber coupler 14, so that no pump light is injected into the second portion, and the output light is L-band ASE light. When the pumping light passes through the second 1 × 2 optical fiber coupler 14, the pumping light is divided into two paths, at this time, the second light switch 16 is switched on, one path of pumping light is pumped by the L-band generating device, the other path of pumping light is pumped by the C-band generating device, and finally the pumping light is coupled and output at the first 1 × 2 optical fiber coupler 8, so that the ASE light output of the C + L band is realized, and the effect of switching the output light of the ASE light of the L and C + L bands is achieved.
the pump light beam emitted by the pump light described in this embodiment enters the first section of low erbium-doped fiber and the second section of low erbium-doped fiber of the first portion through the first wavelength division multiplexer to be pumped, so as to form an output in an L-band.
The pump beam emitted by the pump light described in this embodiment enters the first section of low erbium-doped fiber through the second wavelength division multiplexer of the second section to be pumped, so as to form an output of the C-band.
The length of the first erbium-doped fiber EDFL is 13.3m, and the absorptivity at 976nm is 6 dB/m.
The length of the second erbium-doped fiber EDFL is 90m, and the absorptivity at 976nm is 6 dB/m.
The length of the third erbium-doped fiber EDFL is 7.5m, and the absorptivity at 976nm is 6 dB/m.
The center wavelength of the optical fiber reflector described in this embodiment is 1570nm, the bandwidth is 100nm, and the transmittance is not less than 90%.
The center wavelength of the optical fiber circulator described in this embodiment is 1580nm, and the optical fiber circulator has high transmittance in the S + C + L waveband.
When the optical switch described in this embodiment is turned off, the transmittance thereof is-30 dB.
In the third part, the pump light path is switched by the first 1 × 2 light switch 12, the second optical switch 16 is always closed, and the first 1 × 2 light switch 12 determines whether the pump light first passes through the L-band generating device or the C-band generating device. When the light passes through the L-band generation device, no pump light is injected into the C-band generation device, so that the output light is L-band ASE light. When the pump light passes through the C-band generating device, the pump light is injected into the C-band generating device, and the L-band generating device is not injected with the pump light, so that the ASE light output of the C-band is realized. Thereby achieving the effect of switching the output light of the ASE light of C, L wave bands.
Embodiment 3 a method for implementing the switching between C and C + L bands is as follows:
the pumping light path enters the second 1 × 2 optical fiber coupler 14 through the first 1 × 2 optical switch 12, and is switched by the second optical switch 16, and the second optical switch 16 determines that the pumping light passes through the third 1 × 2 optical fiber coupler 15 and the second wavelength division multiplexer 11 at the same time. Simultaneously enters the third 1X 2 optical fiber coupler 15 and the second wavelength division multiplexer 11 to realize the output of the ASE light of the C + L wave band, independently enters the second wavelength division multiplexer 11, passes through the C wave band generating device to realize the output of the ASE light of the C wave band, thereby achieving the effect of switching the output light of the ASE light of the C wave band and the C + L wave band.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A full-optical-fiber-structure switchable C/L waveband amplified spontaneous emission light source system is characterized by comprising a C waveband generating device and an L waveband generating device, wherein pumping light enters the C waveband generating device or the L waveband generating device through a first optical switch; the L-band generating device comprises a first wavelength division multiplexer, an optical isolator and an optical circulator, pump light sequentially passes through the first wavelength division multiplexer, a first section of low erbium-doped optical fiber and a first optical fiber reflector, then sequentially enters the optical isolator and the optical circulator through the first wavelength division multiplexer, is output by the optical circulator, sequentially enters a second section of low erbium-doped optical fiber and a second optical fiber reflector, returns to the optical circulator through the second optical fiber reflector, and is output to the first optical fiber coupler through the optical circulator to output L-band light; the C-band generating device comprises a second wavelength division multiplexer, a third optical fiber reflector and a third section of low erbium-doped optical fiber, and pump light sequentially passes through the second wavelength division multiplexer, the third section of low erbium-doped optical fiber and the third optical fiber reflector, enters the second wavelength division multiplexer from the third optical fiber reflector, then enters the first optical fiber coupler and outputs C-band light.
2. The switchable C/L band spontaneous emission light source system of claim 1, further comprising a second fiber coupler and a third fiber coupler, wherein a second optical switch is disposed between the second fiber coupler and the third fiber coupler, and the pump light enters the C band generating device through the second fiber coupler and enters the L band generating device through the third fiber coupler; the pump light realizes the switching among the L-waveband light, the C-waveband light and the C + L-waveband light through the first optical switch and the second optical switch.
3. The switchable C/L band amplified spontaneous emission light source system of claim 2, wherein the generating of the L band light comprises the following steps:
s1, pump light is generated by a laser diode, enters a third optical fiber coupler through a first optical switch, sequentially enters a first wavelength division multiplexer, a first section of low erbium-doped optical fiber and a first optical fiber reflector through the third optical fiber coupler, and enters an optical isolator through the first wavelength division multiplexer through the first optical fiber reflector;
s2.C waveband light enters the optical circulator through the optical isolator, is output by the optical circulator, sequentially enters the second section of low erbium-doped optical fiber and the second optical fiber reflector, and enters the optical circulator through the second optical fiber reflector;
and S3, the L-band light enters the first optical fiber coupler through the optical circulator, and the first optical fiber coupler outputs the L-band light.
4. The switchable C/L band amplified spontaneous emission light source system of claim 2, wherein the generation of C band light comprises the following steps:
s1, pump light is generated by a laser diode, enters a second optical fiber coupler through a first optical switch, and enters a second wavelength division multiplexer, a third section of low erbium-doped optical fiber and a third optical fiber reflector in sequence through selection of the second optical switch, and passes through the second wavelength division multiplexer by the third optical fiber reflector;
and S2, the C-band light enters the first optical fiber coupler through the second wavelength division multiplexer and is output.
5. The switchable C/L band amplified spontaneous emission light source system of claim 2, wherein the generation of C + L band light comprises the following steps:
s1, pump light is generated by a laser diode and enters a second optical fiber coupler and a third optical fiber coupler simultaneously through a first optical switch;
s2, pumping light passes through a second optical fiber coupler, one part of the pumping light passes through a second optical switch to enter a third optical fiber coupler, and the other part of the pumping light enters a second wavelength division multiplexer; the light of C wave band enters the optical circulator through the optical isolator, and after being output by the optical circulator, the light enters the second section of low erbium-doped optical fiber and the second optical fiber reflector in sequence, and enters the optical circulator through the second optical fiber reflector; meanwhile, the pump light output by the second wavelength division multiplexer sequentially passes through the third section of low erbium-doped fiber and the third fiber reflector, and is output by the third fiber reflector through the second wavelength division multiplexer;
and S3, coupling the light from the optical circulator and the light from the second wavelength division multiplexer through the first optical fiber coupler and then outputting C + L section light.
6. The switchable C/L band spontaneous emission light source system of claim 2, wherein the pump light is switched by a first light switch, and the second light switch is always turned off, and the first light switch determines whether the pump light first passes through the L band generating device or the C band generating device;
when the light passes through the L-band generating device, no pumping light is injected into the C-band generating device, so that the output light is L-band ASE light;
when the pump light passes through the C-band generation device, the pump light is injected into the C-band generation device, the L-band generation device is not injected with the pump light, the ASE light output of the C-band is realized, and the switching of the output light of the ASE light of the C, L bands is realized.
7. The switchable C/L band spontaneous emission light source system of claim 2, wherein the pump light is switched by a first optical switch, and the first optical switch determines whether the pump light first passes through the second fiber coupler or the third fiber coupler;
when the light passes through the third optical fiber coupler, the light bypasses the second optical fiber coupler, so that no pump light is injected into the second part, and the output light is L-waveband ASE light;
when the pumping light passes through the second optical fiber coupler, the pumping light is divided into two paths, at the moment, the second light is switched on, one path of pumping L-waveband generating device and the other path of pumping C-waveband generating device are finally coupled and output at the first optical fiber coupler, the output of ASE light of C + L waveband is realized, and the switching of the output light of the ASE light of L and C + L wavebands is realized.
8. The switchable C/L band amplified spontaneous emission light source system of claim 2, wherein the pump light path enters the second fiber coupler through the first optical switch and is switched by the second optical switch, and the second optical switch determines whether the pump light simultaneously passes through the third fiber coupler and the second wavelength division multiplexer or enters the second wavelength division multiplexer separately;
simultaneously enters a third optical fiber coupler and a second wavelength division multiplexer to realize ASE optical output of C + L wave band; and the light enters the second wavelength division multiplexer independently to realize the output of the ASE light of the C waveband, so that the switching of the output light of the ASE light of the C and C + L wavebands is realized.
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