CN117579148A - Optical noise testing device and testing method for erbium-ytterbium ion co-doped fiber amplifier - Google Patents
Optical noise testing device and testing method for erbium-ytterbium ion co-doped fiber amplifier Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 169
- 239000000835 fiber Substances 0.000 title claims abstract description 71
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 42
- 239000010703 silicon Substances 0.000 claims abstract description 42
- 239000013307 optical fiber Substances 0.000 claims abstract description 33
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims description 38
- 230000002441 reversible effect Effects 0.000 claims description 28
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 24
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 21
- KWMNWMQPPKKDII-UHFFFAOYSA-N erbium ytterbium Chemical compound [Er].[Yb] KWMNWMQPPKKDII-UHFFFAOYSA-N 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 15
- 229910052691 Erbium Inorganic materials 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 10
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 9
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 229910052738 indium Inorganic materials 0.000 claims description 6
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 8
- 238000010998 test method Methods 0.000 abstract description 4
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- KXNLCSXBJCPWGL-UHFFFAOYSA-N [Ga].[As].[In] Chemical compound [Ga].[As].[In] KXNLCSXBJCPWGL-UHFFFAOYSA-N 0.000 description 2
- 238000012113 quantitative test Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
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- 108010023082 activin A Proteins 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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Abstract
The invention discloses an optical noise testing device of an erbium-ytterbium ion co-doped fiber amplifier, which comprises a signal generator, a pump laser driver, a pump laser, a first silicon photoelectric detector, a second silicon photoelectric detector, a first InGaAs photoelectric detector, a second InGaAs photoelectric detector, a first wavelength division multiplexer, a second wavelength division multiplexer, a first pump beam combiner, a second pump beam combiner and erbium-ytterbium ion co-doped fiber, wherein the signal generator, the pump laser driver and the pump laser are sequentially connected; the dynamic change of the working light noise intensity of the erbium-ytterbium ion co-doped optical fiber gain medium with any specification in the optical fiber amplifier can be accurately tested; by the test method and the device, the interlocking protection response time required by the failure loss of the input laser signal of the EYDFA system can be accurately calibrated.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an optical noise testing device and an optical noise testing method for an erbium-ytterbium ion co-doped optical fiber amplifier.
Background
Erbium ytterbium ion co-doped fiber is the most common type of gain fiber in high power output, various continuous or pulsed fiber amplifier configurations in the 1.5um band (typical optical wavelength range 1500-1650 nm). The electromagnetic radiation signal of the spectrum band has low transmission loss in the optical fiber waveguide and the free space atmosphere environment, and is 'eye-safe' (the maximum acceptable optical radiation power density threshold is 2-4 orders of magnitude higher than the ultraviolet and visible spectrum band). The erbium-ytterbium ion co-doped fiber with the doped fiber is used as a fiber amplifier of a gain medium, and is widely applied to the fields of fiber communication, space laser communication, fiber sensing, laser radar, atmospheric environment laser remote sensing and the like.
The conventional low-power Erbium-doped fiber amplifier (Erbium-Doped Fiber Amplifier, hereinafter referred to as EDFA) cannot realize higher concentration doping due to the influence of quenching effect among Erbium ions on amplification pumping efficiency, and the highest amplification output optical power is only in the order of hundred milliwatts. The erbium-ytterbium ion doped fiber is doped by mixing erbium ions and ytterbium ions according to a proper concentration ratio, and compared with the erbium ions, the ytterbium ions doped with higher concentration can absorb the pumping laser energy injected into the fiber amplifier more efficiently, so that the negative influence of concentration quenching effect among the erbium ions is effectively reduced. The ytterbium ion doped sensitization can realize the amplification output of the EYDFA at the hundred watt level laser power of the 1.5um spectrum band. In practical system engineering application, the optical fiber amplifier mainly provides various gain amplification functions of front-end input small-signal laser, when the input laser power is lower than a certain threshold value, the pump light power injected into the optical fiber amplifier cannot be effectively absorbed and converted, and a large amount of optical noise transmitted along the forward and backward directions of an optical fiber link is generated in the system and is characterized by wide-spectrum amplified spontaneous emission (Amplified Spontaneous Emission, ASE for short below) noise. The optical noise transmitted in the system is accumulated to a certain extent, which can damage the normal performance of various optical fiber devices in the link, and the stability of the system is reduced and even the devices are damaged. In practical engineering application, the lowest safety threshold power of an input laser signal needs to be tested and set to ensure the normal operation of the system. The presence of two doping ions also means that there are two bands of ASE optical noise in the fiber amplifier, the typical spectral wavelength ranges being 1520-1570nm of erbium band ASE optical noise and 1000-1100nm of ytterbium band ASE optical noise, respectively.
In the EYDF design of practical engineering application, especially, under the condition of fault interruption of an input laser signal to be amplified, the intensity and the accumulation speed of erbium-ytterbium dual-band ASE noise generated in a transient state in a system are considered, reasonable early warning response time and a safety threshold are designed, the pumping current of an amplifier is turned off to eliminate ASE optical noise, and the working performance of each device in the optical fiber amplifier is protected from the influence of the interruption of the burst input signal through the interlocking (inter) function. In recent years, a great deal of theoretical and experimental researches are carried out on the generation mechanism and the inhibition scheme of erbium and ytterbium dual-band ASE noise in a 1.5um spectrum band EYDFA, but quantitative tests for the transient evolution process of the optical noise intensity in an optical fiber amplifier system are lacked, and parameters required by practical engineering application designs such as the interlocking response time of the optical fiber amplifier, the safety threshold value of the optical power of an input signal and the like cannot be accurately calibrated.
Disclosure of Invention
The invention aims to provide an erbium-ytterbium ion co-doped fiber amplifier optical noise testing device and method for aiming at the defect that the quantitative test of the transient evolution process of the optical noise intensity in a fiber amplifier system in the prior art cannot accurately calibrate parameters required by practical engineering application designs such as the interlocking response time of the fiber amplifier, the input signal optical power safety threshold value and the like.
In order to achieve the above object, the present invention adopts the following technical scheme:
the optical noise testing device of the erbium-ytterbium ion co-doped fiber amplifier comprises a signal generator, a pump laser driver, a pump laser, a first silicon photoelectric detector, a second silicon photoelectric detector, a first InGaAs photoelectric detector, a second InGaAs photoelectric detector, a first wavelength division multiplexer, a second wavelength division multiplexer, a first pump beam combiner, a second pump beam combiner and erbium-ytterbium ion co-doped fiber, wherein the signal generator, the pump laser driver and the pump laser are sequentially connected;
after the electric pulse generated by the signal generator is loaded to the pump laser driver, the pump laser generates pump laser pulse, the pump laser pulse enters the erbium-ytterbium ion co-doped optical fiber through the first pump beam combiner, the generated forward transmission erbium-ytterbium dual-band ASE optical noise is transmitted rightwards, the forward transmission erbium-ytterbium dual-band ASE optical noise is separated into erbium-band and ytterbium-band optical noise through the second wavelength division multiplexer, the ytterbium-band optical noise is collected into the second silicon photoelectric detector through the second wavelength division multiplexer, and the erbium-band optical noise is collected into the second indium-gallium-arsenic photoelectric detector through the second wavelength division multiplexer, so that an optical noise forward transmission detection path in the device is formed;
after the electric pulse generated by the signal generator is loaded to the pump laser driver, the pump laser generates pump laser pulse, the pump laser pulse enters the erbium-ytterbium ion co-doped optical fiber through the second pump beam combiner, the generated reverse transmission erbium-ytterbium dual-band ASE optical noise enters the first wavelength division multiplexer to the left, the erbium-ytterbium dual-band ASE optical noise is separated into erbium-band optical noise and ytterbium-band optical noise, the ytterbium-band optical noise is collected into the first silicon photoelectric detector through the first wavelength division multiplexer, and the erbium-band optical noise is collected into the first indium-gallium-arsenic photoelectric detector through the first wavelength division multiplexer to form a reverse transmission detection path of the optical noise in the device.
As a further preferred aspect of the present invention, a second pump filter is disposed between the first wavelength division multiplexer and the erbium ytterbium ion co-doped fiber; and a first pump filter is arranged between the second wavelength division multiplexer and the erbium ytterbium ion co-doped fiber.
As a further preferred mode of the invention, the first pump filter and the second pump filter have the same structure and comprise a tail fiber core diameter and a numerical aperture, and the tail fiber core diameter and the numerical aperture are matched with the erbium ytterbium ion co-doped optical fiber.
As a further preferred aspect of the present invention, the first silicon photodetector and the second silicon photodetector may each be a free space type silicon photodetector, a silicon photodetector with pigtail input, or a photodetector with adjustable attenuation factor.
As a further preferred aspect of the present invention, the first ingaas photodetector and the second ingaas photodetector may each be a free space type silicon photodetector, a silicon photodetector with a pigtail input, or a photodetector with an adjustable attenuation factor.
As a further preferred aspect of the present invention, the erbium ytterbium ion co-doped fiber is configured as a single-mode, few-mode or multimode fiber.
As a further preferred aspect of the present invention, the first wavelength division multiplexer includes a first connection port, a second connection port, and a third connection port; the first connecting port is used for connecting with the second pump filter, the second connecting port is used for connecting with the first silicon photoelectric detector, and the third connecting port is used for connecting with the first InGaAs photoelectric detector.
As a further preferred aspect of the present invention, the second wavelength division multiplexer includes a fourth connection port, a fifth connection port, and a sixth connection port; the fourth connection port is used for being connected with the first pumping filter, the fifth connection port is used for being connected with the second silicon photoelectric detector, and the sixth connection port is used for being connected with the second InGaAs photoelectric detector.
The test method of the erbium-ytterbium ion co-doped fiber amplifier optical noise test device comprises the following steps:
s1, outputting optical pulse by a pump laser to delay T0 relative to the output triggering pulse signal of a signal generator;
s2, the delay of the ytterbium-band optical noise signal detected by the first silicon photoelectric detector relative to the trigger signal is T1, and the optical noise signal strength is V1;
s3, the delay of the ytterbium-band optical noise signal detected by the second silicon photoelectric detector relative to the trigger signal is T2, and the optical noise signal strength is V2;
s4, the delay of the erbium-band optical noise signal detected by the first InGaAs photoelectric detector relative to the trigger signal is T3, and the optical noise signal strength is V3;
s5, the delay of the erbium-band optical noise signal detected by the second InGaAs photoelectric detector relative to the trigger signal is T4, and the optical noise signal strength is V4;
s6, obtaining the generation time of the optical noise of the reverse transmission ytterbium wave band as T1-T0 and the generation time of the optical noise of the reverse transmission erbium wave band as T3-T0 through calculation;
s7, calculating to obtain that the forward transmission ytterbium-band optical noise generation time is T2-T0, and the forward transmission erbium-band optical noise generation time is T4-T0;
s8, comparing four groups of time in S6 and S7, wherein the minimum time value is defined as the erbium-ytterbium ion co-doped fiber amplifier system; the safe interlocking time value when the input laser signal is lost, the pump laser driver is rapidly turned off and the output laser of the pump laser is turned off within the safe interlocking time value, so that the normal performance of each device in the system can be protected;
s9, quantitatively analyzing the magnitudes of the optical noise of the reverse ytterbium wave band and the forward ytterbium wave band by comparing the optical noise signal strength V1 of the optical noise of the ytterbium wave band with the optical noise signal strength V2 of the optical noise of the ytterbium wave band;
s10, quantitatively analyzing the magnitudes of the reverse and forward erbium-band optical noise by comparing the optical noise signal intensity V3 of the erbium-band optical noise with the optical noise signal intensity V4 of the erbium-band optical noise;
s11, measuring the corresponding time and optical noise intensity by changing the length of the erbium-ytterbium ion co-doped fiber and the pump laser intensity, and forming a design reference value.
Compared with the prior art, the optical noise testing device and the optical noise testing method for the erbium-ytterbium ion co-doped optical fiber amplifier have the following beneficial effects:
1. the invention has simple structure, simple testing method, wide application range and high practicability;
2. the dynamic change of the working light noise intensity of the erbium-ytterbium ion co-doped optical fiber gain medium with any specification in the optical fiber amplifier can be accurately tested;
3. by the test method and the device, the interlocking protection response time required by the failure loss of the input laser signal of the EYDFA system can be accurately calibrated.
Drawings
FIG. 1 is a schematic diagram of a forward transmission detection path of optical noise in an optical noise testing device of an erbium-ytterbium ion co-doped fiber amplifier according to the present invention;
FIG. 2 is a schematic diagram of a reverse transmission detection path of optical noise in an optical noise testing device of an erbium-ytterbium ion co-doped fiber amplifier according to the present invention;
fig. 3 is a schematic diagram of a time sequence measured by an optical noise testing device of the erbium-ytterbium ion co-doped fiber amplifier according to the present invention.
Meaning of reference numerals in the drawings: 1. a first silicon photodetector; 101. a second silicon photodetector; 2. a first InGaAs photodetector; 201. a second InGaAs photodetector; 3. a first wavelength division multiplexer; 3A, a first connection port; 3B, a second connection port; 3C, a third connection port; 301. a second wavelength division multiplexer; 301A, a fourth connection port; 301B, fifth connection port; 301C, a sixth connection port; 4. a first pump combiner; 401. a second pump combiner; 5. a pump laser; 6. a pump laser driver; 7. a signal generator; 8. erbium ytterbium ion co-doped fiber; 9. a first pump filter; 901. a second pump filter.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments.
In order to analyze transient generation and strength evolution of erbium-ytterbium dual-band ASE optical noise transmitted in forward and backward directions in an optical fiber amplifier link under the condition that EYDFA does not have input signal light, and accurately measure effective response speed of an interlocking protection function of an optical fiber amplifying system, the invention provides an erbium-ytterbium ion co-doped optical fiber amplifier optical noise testing device and an erbium-ytterbium ion co-doped optical fiber amplifier optical noise testing method.
The optical noise testing device and the testing method for the erbium-ytterbium ion co-doped fiber amplifier are suitable for continuous laser signal input and also suitable for pulse laser signal input; the method is suitable for the optical fiber amplifier to adopt a unidirectional pumping (forward or reverse) mode, and is also suitable for the optical fiber amplifier to adopt a bidirectional pumping (forward and reverse simultaneous) mode; in particular, the device is applicable to a fiber amplifier, and the wavelength range of an input laser signal to be amplified is 1.5um spectrum band (the typical wavelength range of light is 1500-1650 nm).
Embodiment one: referring to fig. 1 and 2, the optical noise testing device for the erbium ytterbium ion co-doped fiber 8 comprises a signal generator 7, a pump laser driver 6, a pump laser 5, a first silicon photoelectric detector 1, a first indium gallium arsenic photoelectric detector 2, a first wavelength division multiplexer 3, a second pump filter 901, a first pump beam combiner 4, a second silicon photoelectric detector 101, a second indium gallium arsenic photoelectric detector 201, a second wavelength division multiplexer 301, a first pump filter 9, a second pump beam combiner 401 and the erbium ytterbium ion co-doped fiber 8, which are sequentially connected.
The first silicon photodetector 1 and the second silicon photodetector 101 can select a free space mode or a pigtail input mode according to a received light radiation mode; the photoelectric detector with adjustable attenuation multiple can be used for detecting ytterbium-band optical noise of forward and reverse transmission according to different light intensity ranges of saturated detection, and typical response wave bands are 200nm-1100nm and are arranged on the front side and the rear side of EYDAA.
The first and second ingaas photodetectors 2 and 201 may receive optical radiation in a free space mode or a pigtail input mode. The photoelectric detector can also be an adjustable attenuation multiple according to different light intensity ranges of saturation detection, and the typical response wave band is 850nm-1700nm, and is arranged on the front side and the rear side of EYDAA and used for detecting erbium-band optical noise of forward and reverse transmission.
The signal generator 7 is used for generating a pulse signal with adjustable amplitude, frequency and pulse width, the pulse signal is used as a driving current trigger signal of the EYDFA pump laser 5, the pump laser 5 is turned on when the pulse signal is at a high level, the pump laser 5 is turned off when the pulse signal is at a low level, and the output power amplitude of the pump laser 5 is determined by the output amplitude of the pulse signal.
The pumping wavelength of the pumping laser 5 is the absorption peak wavelength of the erbium-ytterbium ion co-doped fiber 8, including but not limited to 900-1000 nm.
The pump beam combiner is used for coupling pump laser into the erbium ytterbium ion co-doped fiber 8 through a pump end, reverse transmission optical noise generated in the testing process is output from an input port, forward transmission optical noise is output from an output port, and the core diameter and the cladding of the fiber at the output end are matched with the erbium ytterbium ion co-doped fiber 8.
A second pump filter 901 is arranged between the first wavelength division multiplexer 3 and the erbium ytterbium ion co-doped optical fiber 8; a first pump filter 9 is arranged between the second wavelength division multiplexer 301 and the erbium ytterbium ion co-doped fiber 8; the first pump filter 9 and the second pump filter 901 are used for filtering the remaining unabsorbed pump light in the erbium ytterbium ion co-doped fiber 8, and the core diameter and the numerical aperture of the tail fiber are matched with those of the erbium ytterbium ion co-doped fiber 8.
The erbium-ytterbium ion co-doped fiber 8 can be single-mode, few-mode and multi-mode fibers, including but not limited to erbium-ytterbium ion co-doped fibers 8 with different commercial specifications of Nufern, ixbule, reactive, wuhan growth and other manufacturers; in particular, for the same specification of optical fiber, the optical noise characteristics of the optical fiber amplifier can be tested when different lengths of optical fiber are used.
Wavelength division multiplexer for separating erbium ytterbium dual-band ASE optical noise output from EYDFA two ends and respectively guiding the noise into corresponding spectral band photodetectors
The first wavelength division multiplexer 3 comprises a first connection port 3A, a second connection port 3B and a third connection port 3C; the first connection port 3A is used for connecting with a second pump filter 901, the second connection port 3B is used for connecting with a first silicon photodetector 1, and the third connection port 3C is used for connecting with a first indium gallium arsenide photodetector 2.
The second wavelength division multiplexer 301 includes a fourth connection port 301A, a fifth connection port 301B, and a sixth connection port 301C; the fourth connection port 301A is used for connecting to the first pump filter 9, the fifth connection port 301B is used for connecting to the second silicon photodetector 101, and the sixth connection port 301C is used for connecting to the second indium gallium arsenide photodetector 201.
In the device, the output trigger pulse signal frequency and pulse width of the signal generator 77 are regulated, so that the time dynamic process of the evolution of the optical noise characteristics of the doped fiber under different pumping time conditions can be tested.
After the electric pulse generated by the signal generator 7 is loaded to the pump laser driver 6, the pump laser 5 generates pump laser pulse, the pump laser pulse enters the erbium ytterbium ion co-doped optical fiber 8 through the first pump beam combiner 4, the generated forward transmission erbium ytterbium dual-band ASE optical noise is transmitted rightward, the forward transmission erbium ytterbium dual-band ASE optical noise is separated into erbium band and ytterbium band optical noise through the second wavelength division multiplexer 301, the ytterbium band optical noise is collected into the second silicon photoelectric detector 101 through the second wavelength division multiplexer 301, and the erbium band optical noise is collected into the second indium gallium arsenic photoelectric detector 201 through the second wavelength division multiplexer 301, so that an optical noise forward transmission detection path in the device is formed.
After the electric pulse generated by the signal generator 7 is loaded to the pump laser driver 6, the pump laser 5 generates pump laser pulse, the pump laser pulse enters the erbium-ytterbium ion co-doped optical fiber 8 through the second pump beam combiner 401, the generated reverse transmission erbium-ytterbium dual-band ASE optical noise enters the first wavelength division multiplexer 3 leftwards, the erbium-ytterbium dual-band ASE optical noise is separated into erbium-band optical noise and ytterbium-band optical noise, the ytterbium-band optical noise is collected into the first silicon photoelectric detector 1 through the first wavelength division multiplexer 3, the erbium-band optical noise is collected into the first indium-gallium-arsenic photoelectric detector 2 through the first wavelength division multiplexer 3, and a reverse transmission detection path of the optical noise in the device is formed.
Embodiment two: referring to fig. 3, the delay T0 of the pump laser signal with respect to the external trigger signal (without loss of generality, reference is made to the rising edge); the ytterbium wave band ASE optical noise of reverse transmission is delayed by T1 relative to pumping laser; the ytterbium wave band ASE optical noise of forward transmission is delayed by T2 relative to pumping laser; the ASE optical noise of the erbium wave band transmitted in the reverse direction is delayed by T3 relative to the pumping laser; the delay T4 of the ASE optical noise of the erbium wave band transmitted in the T4-forward direction relative to the pump laser; the amplitude V1 of the noise intensity of the ytterbium-band ASE light in reverse transmission; v2-ytterbium-band ASE optical noise intensity amplitude V2 of forward transmission; the intensity amplitude V3 of the reverse transmitted erbium-band ASE optical noise; the forward transmitted erbium-band ASE optical noise intensity amplitude V4.
The test method of the erbium-ytterbium ion co-doped fiber 8 amplifier optical noise test device comprises the following steps:
s1, outputting a light pulse by a pump laser 5 and outputting a triggering pulse signal by a triggering pulse signal generator 7 with a delay of T0;
s2, the delay of the ytterbium-band optical noise signal detected by the first silicon photoelectric detector 1 relative to the trigger signal is T1, and the optical noise signal strength is V1;
s3, the delay of the ytterbium-band optical noise signal detected by the second silicon photoelectric detector 101 relative to the trigger signal is T2, and the optical noise signal strength is V2;
s4, the delay of the erbium-band optical noise signal detected by the first InGaAs photoelectric detector 2 relative to the trigger signal is T3, and the optical noise signal strength is V3;
s5, the delay of the erbium-band optical noise signal detected by the second InGaAs photoelectric detector 201 relative to the trigger signal is T4, and the optical noise signal strength is V4;
s6, obtaining the generation time of the optical noise of the reverse transmission ytterbium wave band as T1-T0 and the generation time of the optical noise of the reverse transmission erbium wave band as T3-T0 through calculation;
s7, calculating to obtain that the forward transmission ytterbium-band optical noise generation time is T2-T0, and the forward transmission erbium-band optical noise generation time is T4-T0;
s8, comparing four groups of time in S6 and S7, wherein the minimum time value is defined as the erbium-ytterbium ion co-doped fiber 8 amplifier system; the safe interlocking time value when the input laser signal is lost, and the pump laser driver 6 and the output laser of the pump laser 5 are rapidly turned off within the safe interlocking time value, so that the normal performance of each device in the system can be protected;
s9, quantitatively analyzing the magnitudes of the optical noise of the reverse ytterbium wave band and the forward ytterbium wave band by comparing the optical noise signal strength V1 of the optical noise of the ytterbium wave band with the optical noise signal strength V2 of the optical noise of the ytterbium wave band;
s10, quantitatively analyzing the magnitudes of the reverse and forward erbium-band optical noise by comparing the optical noise signal intensity V3 of the erbium-band optical noise with the optical noise signal intensity V4 of the erbium-band optical noise;
s11, measuring the corresponding time and optical noise intensity by changing the length of the erbium-ytterbium ion co-doped optical fiber 8 and the pumping laser intensity, and forming a design reference value.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.
Claims (9)
1. The optical noise testing device of the erbium-ytterbium ion co-doped fiber amplifier comprises a signal generator (7), a pump laser driver (6) and a pump laser, and is sequentially connected with the pump laser driver, and is characterized by further comprising a first silicon photoelectric detector (1), a second silicon photoelectric detector (101), a first InGaAs photoelectric detector (2), a second InGaAs photoelectric detector (201), a first wavelength division multiplexer (3), a second wavelength division multiplexer (301), a first pump beam combiner (4), a second pump beam combiner (401) and an erbium-ytterbium ion co-doped fiber (8);
after an electric pulse generated by a signal generator (7) is loaded to a pump laser driver (6), a pump laser (5) generates a pump laser pulse, the pump laser pulse enters an erbium-ytterbium ion co-doped optical fiber (8) through a first pump beam combiner (4), generated forward transmission erbium-ytterbium dual-band ASE optical noise is transmitted rightwards, the forward transmission erbium-ytterbium dual-band ASE optical noise is separated into erbium-band and ytterbium-band optical noise through a second wavelength division multiplexer (301), the ytterbium-band optical noise is collected into a second silicon photoelectric detector (101) through the second wavelength division multiplexer (301), and the erbium-band optical noise is collected into a second indium-gallium-arsenic photoelectric detector (201) through the second wavelength division multiplexer (301), so that an optical noise forward transmission detection path in the device is formed;
after the electric pulse generated by the signal generator (7) is loaded to the pump laser driver (6), the pump laser (5) generates pump laser pulse, the pump laser pulse enters the erbium-ytterbium ion co-doped optical fiber (8) through the second pump beam combiner (401), the generated reverse transmission erbium-ytterbium dual-band ASE optical noise enters the first wavelength division multiplexer (3) leftwards, the erbium-ytterbium dual-band ASE optical noise is separated into erbium-band optical noise and ytterbium-band optical noise, the ytterbium-band optical noise is collected into the first silicon photoelectric detector (1) through the first wavelength division multiplexer (3), and the erbium-band optical noise is collected into the first indium gallium arsenic photoelectric detector (2) through the first wavelength division multiplexer (3), so that a reverse transmission detection path of the optical noise in the device is formed.
2. The optical noise testing device of the erbium-ytterbium ion co-doped fiber amplifier according to claim 1, wherein a second pump filter (901) is arranged between the first wavelength division multiplexer (3) and the erbium-ytterbium ion co-doped fiber (8); a first pump filter (9) is arranged between the second wavelength division multiplexer (301) and the erbium ytterbium ion co-doped fiber (8).
3. The optical noise testing device of the erbium ytterbium ion co-doped fiber amplifier according to claim 2, wherein the first pump filter (9) and the second pump filter (901) have the same structure and comprise a tail fiber core diameter and a numerical aperture, and the tail fiber core diameter and the numerical aperture are matched with the erbium ytterbium ion co-doped fiber (8).
4. The erbium ytterbium ion co-doped fiber amplifier optical noise testing device according to claim 1, wherein the first silicon photodetector (1) and the second silicon photodetector (101) can be free space type silicon photodetectors, pigtail input type silicon photodetectors or photodetectors with adjustable attenuation factors.
5. The erbium ytterbium ion co-doped fiber amplifier optical noise testing device according to claim 1, wherein the first indium gallium arsenic photodetector (2) and the second indium gallium arsenic photodetector (201) can be free space type silicon photodetectors, pigtail input type silicon photodetectors or photodetectors with adjustable attenuation factors.
6. The erbium ytterbium ion co-doped fiber amplifier optical noise testing device according to claim 1, wherein the erbium ytterbium ion co-doped fiber (8) is configured as a single-mode, a few-mode or a multi-mode fiber.
7. The erbium ytterbium ion co-doped fiber amplifier optical noise testing device according to claim 2, wherein the first wavelength division multiplexer (3) comprises a first connection port (3A), a second connection port (3B) and a third connection port (3C); the first connection port (3A) is used for being connected with the second pumping filter (901), the second connection port (3B) is used for being connected with the first silicon photoelectric detector (1), and the third connection port (3C) is used for being connected with the first InGaAs photoelectric detector (2).
8. The erbium ytterbium ion co-doped fiber amplifier optical noise testing device according to claim 2, wherein the second wavelength division multiplexer (301) comprises a fourth connection port (301A), a fifth connection port (301B), and a sixth connection port (301C); the fourth connection port (301A) is used for being connected with the first pump filter (9), the fifth connection port (301B) is used for being connected with the second silicon photoelectric detector (101), and the sixth connection port (301C) is used for being connected with the second InGaAs photoelectric detector (201).
9. The testing method of the optical noise testing device of the erbium-ytterbium ion co-doped fiber amplifier according to any one of claims 1 to 8, comprising the following steps:
s1, outputting optical pulse by a pump laser (5) and outputting a trigger electric pulse signal by a relative signal generator (7) with a delay of T0;
s2, the delay of the ytterbium-band optical noise signal detected by the first silicon photoelectric detector (1) relative to the trigger signal is T1, and the optical noise signal strength is V1;
s3, the delay of the ytterbium-band optical noise signal detected by the second silicon photoelectric detector (101) relative to the trigger signal is T2, and the optical noise signal strength is V2;
s4, the delay of the erbium-band optical noise signal detected by the first InGaAs photoelectric detector (2) relative to the trigger signal is T3, and the optical noise signal intensity is V3;
s5, the delay of the erbium-band optical noise signal detected by the second InGaAs photoelectric detector (201) relative to the trigger signal is T4, and the optical noise signal intensity is V4;
s6, obtaining the generation time of the optical noise of the reverse transmission ytterbium wave band as T1-T0 and the generation time of the optical noise of the reverse transmission erbium wave band as T3-T0 through calculation;
s7, calculating to obtain that the forward transmission ytterbium-band optical noise generation time is T2-T0, and the forward transmission erbium-band optical noise generation time is T4-T0;
s8, comparing four groups of time in S6 and S7, wherein the minimum time value is defined as the erbium-ytterbium ion co-doped optical fiber (8) amplifier system; when the input laser signal is lost, the safety interlocking time value is smaller than the safety interlocking time value, the pump laser driver (6) is rapidly turned off, and the output laser of the pump laser (5) is turned off, so that the normal performance of each device in the system can be protected;
s9, quantitatively analyzing the magnitudes of the optical noise of the reverse ytterbium wave band and the forward ytterbium wave band by comparing the optical noise signal strength V1 of the optical noise of the ytterbium wave band with the optical noise signal strength V2 of the optical noise of the ytterbium wave band;
s10, quantitatively analyzing the magnitudes of the reverse and forward erbium-band optical noise by comparing the optical noise signal intensity V3 of the erbium-band optical noise with the optical noise signal intensity V4 of the erbium-band optical noise;
s11, measuring the corresponding time and optical noise intensity by changing the length of the erbium-ytterbium ion co-doped fiber (8) and the pumping laser intensity, and forming a design reference value.
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