CN101043268B - Apparatus and method for testing optical signal-noise ratio in optical amplifier transmission link - Google Patents
Apparatus and method for testing optical signal-noise ratio in optical amplifier transmission link Download PDFInfo
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- CN101043268B CN101043268B CN2006100600330A CN200610060033A CN101043268B CN 101043268 B CN101043268 B CN 101043268B CN 2006100600330 A CN2006100600330 A CN 2006100600330A CN 200610060033 A CN200610060033 A CN 200610060033A CN 101043268 B CN101043268 B CN 101043268B
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Abstract
A type of light Signal-to-Noise detecting device in photoamplifier transmission link band includes pulse light signal generator, light splitter, photoelectric transducer, trigger, and spectrometer; the pulse light signal generator is meted into the system which is to be detected before the photoamplifier; the light splitter is connected with the light port of the light transmission system, the light splitter possesses two output, one is connected with the spectrometer, another is connected with the spectrometer via the photoelectric transducer and trigger. The invention also introduces the corresponding detecting method. Adopting the generation measure of trigger signal in test terminal, the invention possesses advancements of measuring light Signal-to-Noise precisely as common spectrometer, and effect that the light Signal-to-Noise of light transmission system can be detected by band-in method by common spectrometer can be achieved.
Description
Technical field
The present invention relates to the testing apparatus of Optical Signal To Noise Ratio in a kind of band of the transmission link with image intensifer, relate in particular to the optical transmission device of optical communication field.
Background technology
The conventional method of optical transmission system Optical Signal To Noise Ratio (OSNR) test is to adopt interpolation method, and with the mean value of the noise of the offset signal centre frequency noise as the signal frequency place, the ratio of signal power and this noise power is Optical Signal To Noise Ratio.This method is commonly referred to as " being with outer method of testing ".
There are some problems in the band external test methods, for example in dense wave division multipurpose (DWDM) optical transmission system, when comprising optical add/drop multiplexer (OADM), because the filter effect of optical filter, the shape of noise of the left and right sides frequency range of offset signal frequency is changed, mean value with the noise at the frequency place, the left and right sides of the offset signal frequency that obtains of the outer method of testing of band is not the true noise of signal, can not obtain correct test result.
In addition, when the wavelength interval of dwdm system is smaller, if use the outer test of band to need the spectrometer of high dynamic range, for example the dwdm system of wavelength interval 25GHz needs the dynamic range of spectrometer to reach 40dB@ ± 0.1nm, and the dynamic range of common spectrometer is generally 40dB@ ± 0.2nm, need buy expensive high accuracy spectrometer with the outer method of testing of band this moment.
In some cases, do not wish to test at optical multiplexing section, for example G.698.2 international standard ITU-T adopts the method standard of black link that the dwdm system of image intensifer is arranged, the OSNR of this standard definition is in the output (optical branching filter output) of black link, this reference point is because the filter effect of optical branching filter, the noise-shape of offset signal frequency is changed, and can't test with the outer method of band.
Another kind method is so-called " band build-in test method ", utilize erbium-doped fiber amplifier (EDFA) in the short time that input optical signal is turned off, the obviously characteristics of change do not take place because of Active Optical Fiber high level ion lifetime characteristic in noise power, adopt the time domain light extinction method to test out in-band noise, thereby calculate the output OSNR of EDFA, and noise factor, as shown in Figure 1, the light pulse that laser Laser produces certain frequency inputs to image intensifer A, laser Laser exports a pulse signal by triggering delivery outlet Trigger out simultaneously, directly gives the triggering input port Trigger in of spectrometer M.Spectrometer M connects the output of image intensifer A, under the pulse triggering signal control of laser Laser, amplified spont-aneous emission (ASE) noise at centre frequency place when spectrometer M test light power turn-offs, the power at centre frequency place when test light power is opened again, thereby calculate the output OSNR of EDFA, and noise factor.
Problem when using method test macro in the band: 1, the time-delay of transmission line; 2, the time-delay of enabled instruction from the receiving terminal to the transmitting terminal; 3, one there is the transmission line of image intensifer in system, and the transient response that luminous power shutoffs/recovery causes when the band build-in test may influence test result because of the system configuration difference; 4, under the device context service conditions, transmitting terminal is in different places with receiving terminal.These problems make band build-in test method inapplicable.
Summary of the invention
The technical problem to be solved in the present invention is in order to overcome the shortcoming of the Optical Signal To Noise Ratio that common image intensifer (OA) noise factor testing apparatus can't the test light transmission system, proposed a kind of device, correspondingly proposed a kind of method of testing with method test light transmission system Optical Signal To Noise Ratio in the band.
Optical Signal To Noise Ratio testing apparatus in the optical amplifier transmission link band among the present invention comprises pulsed optical signals generator, optical splitter, photoelectric transformer, trigger, variable delay device, spectrometer; The pulsed optical signals generator inserts system under test (SUT) before the optical sender input of optical transmission system or before wave multiplexer input or the wave multiplexer output image intensifer; Optical splitter connects the light mouth after optical transmission system transmission, two delivery outlets of optical splitter, and one connects spectrometer, and one connects described spectrometer again through photoelectric transformer, trigger, variable delay device.
In such scheme, can also comprise command generator, the pulsed optical signals generator comprises control impuls generator and optical switch, and the control impuls generator is connected with optical switch, control opening/turn-offing of optical switch, optical switch is connected with the output of optical sender or the output of wave multiplexer; Described command generator produces instruction, gives the control impuls generator or gives the control impuls generator by data communication network on the one hand, makes it to produce control impuls; Deliver to spectrometer on the other hand.
In such scheme, can also comprise a comparator, the control impuls generator is controlled opening/turn-offing of optical switch, produce the pulsed light of certain frequency, optical splitter is divided into two-way with the light signal of test port, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer, and light signal is converted to the signal of telecommunication, and comparator is the delay of the signal of the signal of telecommunication after system transmissions and control impuls generator relatively, obtain retardation, the control impuls generator postpones this retardation, gives trigger, adjusts postponing through the adjustable delay device again, determine the trigger point, trigger spectrometer; Command generator produces instruction, gives the control impuls generator on the one hand and produces control signal, gives spectrometer on the other hand, and spectrometer is received instruction and tested.
In such scheme, can also comprise the comparator and the second control impuls generator; The control impuls generator is controlled opening/turn-offing of optical switch, produce the pulsed light of certain frequency, optical splitter is divided into two-way with the light signal of test port, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer, light signal is converted to the signal of telecommunication, comparator is the signal of telecommunication after system transmissions and the signal delay of the second control impuls generator relatively, obtain retardation, the second control impuls generator postpones this retardation, gives trigger, adjusts postponing through the adjustable delay device again, determine the trigger point, trigger spectrometer; Command generator produces instruction, on the one hand by data communication network, gives the control impuls generator and produces control signal; Give second control impuls generator and the spectrometer on the other hand respectively, spectrometer is received instruction and is tested.
The method of Optical Signal To Noise Ratio in the photometry amplifier transmission link band among the present invention is at the pulsed light of transmitting terminal generation and output certain frequency; Output light signal through system transmissions is divided into two-way through optical splitter, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer, light signal is converted to the signal of telecommunication, recover pulse signal through trigger again, adjust postponing through the adjustable delay device again, determine the trigger point, trigger spectrometer; Luminous power P1 when elder generation's test light signal is opened, the luminous power P2 when the test light signal turn-offs again; Spectrometer calculating Optical Signal To Noise Ratio=signal/noise=(P1-P2)/P2.
Spectrometer carries out spectral scan under the control of the start pulse signal that recovers, the integral light power P 1 that the path central wavelength obtained when the test light signal was opened, the integral light power P 2 that the path central wavelength obtained when light signal turn-offed.
In such scheme, described integral light power is included in the integration of periodic sampling under the definite retardation condition; Or the integration of under a variable retardation condition, repeatedly sampling.
Adopt the present invention, compared with prior art, owing to taked the generating technique measure of test lead triggering signal, obtained the progress of the accurate test light transmission system of normal optical spectrometer Optical Signal To Noise Ratio, reached the effect of normal optical spectrometer with method test light transmission system Optical Signal To Noise Ratio in the band.
Description of drawings
Fig. 1 is the noise factor testing apparatus of image intensifer (OA);
Fig. 2 is with Optical Signal To Noise Ratio testing apparatus resolution chart in the optical amplifier transmission link band of the present invention;
Fig. 3 is an Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band;
Fig. 4 is an Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band;
Fig. 5 is an Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band;
Fig. 6 is an Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band;
Fig. 7 is an Optical Signal To Noise Ratio testing apparatus in the factory condition optical amplifier transmission link band;
Fig. 8 is an Optical Signal To Noise Ratio testing apparatus in the factory condition optical amplifier transmission link band;
Fig. 9 is an Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band;
Figure 10 is an Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band;
Figure 11 is an Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band;
Figure 12 is the test signal schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, enforcement of the present invention is described in detail.
Give the content of the acceptance of the bid note expression of publishing picture earlier:
1,2: tested system;
A: image intensifer;
B: comparator;
C, C ': control impuls generator;
D, E: optical splitter;
DCN: data communication network;
DMUX: channel-splitting filter;
F1, F2: test light interface;
I: command generator;
K: pulsed optical signals generator;
L: optical fiber transmission line;
M: spectrometer;
MUX: wave multiplexer;
O/E: photoelectric transformer;
Rx: optical receiver;
S: optical switch;
T: trigger;
Tx: optical sender;
τ
0: transmitting terminal generation pulse signal and pulse signal are transferred to the delay of test lead;
δ τ: adjustable delay;
τ: transmitting terminal produces the delay of the input triggering signal of pulse signal and spectrometer M.
Fig. 1 is the common testing apparatus with method test light noise figure of amplifier in the band.Among Fig. 1, the light pulse that laser Laser produces certain frequency inputs to image intensifer A, and laser Laser exports a pulse signal by triggering delivery outlet Trigger out simultaneously, directly gives the triggering input port Trigger in of spectrometer M.Spectrometer M connects the output of image intensifer A, under the pulse triggering signal control of laser Laser, amplified spont-aneous emission (ASE) noise at centre frequency place when spectrometer M test light power turn-offs, the power at centre frequency place when test light power is opened again, thereby calculate the output OSNR of EDFA, and noise factor.
Fig. 2 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the optical amplifier transmission link band of the present invention.Fig. 2 can be used for the OSNR of test light transmission system under factory condition or the field condition.
When the OSNR to optical transmission system tested, pulsed optical signals generator K is connecting system before the image intensifer A of optical transmission system, in Fig. 2 was to insert optical transmission system between optical sender Tx output and wave multiplexer MUX input.
Pulsed optical signals generator K control optical sender Tx produces the pulsed light (shown in the K output average light power of Figure 12) of certain frequency (as 25kHz), controls opening and turn-offing of optical transmission system light signal.
Optical splitter D connects the light mouth after the optical transmission system transmission, and Fig. 2 connects the output of channel-splitting filter DMUX.
Two delivery outlets of optical splitter D, one meets spectrometer M, and one meets photoelectric transformer O/E.The average light power of photoelectric transformer O/E test signal is the signal of telecommunication with the converting optical signals after system transmissions, produces a pulse signal through trigger T.
Can connect a variable delay device behind the trigger T, shown in the δ τ frame of broken lines of Fig. 2, the pulse signal of trigger T be realized an adjustable delay δ τ, determine suitable trigger point, trigger spectrometer M again.
Method of testing is as follows:
1) connect testing apparatus: pulsed optical signals generator K connects after the optical sender Tx, and optical splitter D connects the light mouth of optical transmission system after the image intensifer transmission;
2) test light power: the luminous power P1 when the test light signal is opened, the luminous power P2 during shutoff;
3) calculate Optical Signal To Noise Ratio: spectrometer calculating Optical Signal To Noise Ratio=signal/noise=(P1-P2)/P2.
Above-mentioned steps 2) comprise that transmitting terminal tested for three steps to control, the generation of test lead triggering signal, the luminous power of light signal, as follows:
1. transmitting terminal is to the control of light signal; At transmitting terminal, pulsed optical signals generator K controls the emission luminous power, and the pulsed light of output certain frequency (as 25kHz) is shown in the K output average light power of Figure 12;
2. the generation of test lead triggering signal: at test lead, output light signal through system transmissions is divided into two-way through optical splitter D, and one the tunnel sends into the light signal test port of spectrometer, and one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, recovers pulse signal through trigger T again.Open for avoiding light signal/the dynamic response part of shutdown moment luminous power, add an adjustable delay device δ τ behind trigger T, the pulse signal that trigger T is recovered adds an adjustable delay, adjusts to determine suitable trigger point postponing, and triggers spectrometer;
3. luminous power test: after transmitting terminal produces pulsed optical signals, spectrometer carries out spectral scan under the control of the start pulse signal that recovers, the integral light power P 1 (comprising signal and noise) that the path central wavelength obtained when the test light signal was opened, the integral light power P 2 (only comprising noise) that the path central wavelength obtained when light signal turn-offed.Integrated power wherein comprises following situation: at a definite retardation τ=τ
0The integration of periodic sampling under the+δ τ condition; Or at a variable retardation τ=τ
0The integration of repeatedly sampling under+δ τ ' (wherein δ τ ' the changes within the specific limits) condition.
Fig. 3 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band.Fig. 3 can be used for the OSNR of test light transmission system under factory condition or the field condition.Control impuls generator C produces opening/turn-offing of pulse signal control optical switch S, and the light signal of optical sender Tx output is through the pulsed light of optical switch S generation certain frequency, shown in the K output average light power of Figure 12.Optical splitter D connects the delivery outlet of the channel-splitting filter DMUX of optical transmission system, the light signal of channel-splitting filter DMUX delivery outlet is divided into two-way through optical splitter D, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, recovers pulse triggering signal by trigger T again, adjust postponing δ τ through the adjustable delay device, determine suitable trigger point, trigger spectrometer and test.
Fig. 4 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band.Fig. 4 can be used for the OSNR of test light transmission system under factory condition or the field condition.Control impuls generator C control optical sender Tx opens/turn-offs, and is output as the pulsed light of certain frequency, shown in the K output average light power of Figure 12.Optical splitter D connects the delivery outlet of the channel-splitting filter DMUX of optical transmission system, the light signal of channel-splitting filter DMUX delivery outlet is divided into two-way through optical splitter D, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, recovers pulse triggering signal by trigger T again, adjust postponing δ τ through the adjustable delay device, determine suitable trigger point, trigger spectrometer and test.
Fig. 5 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band.Fig. 5 can be used for the OSNR of test light transmission system 1 under field condition or the factory condition.Control impuls generator C produces opening/turn-offing of pulse signal control optical switch S, and the light signal of optical sender Tx output is through the pulsed light of optical switch S generation certain frequency, shown in the K output average light power of Figure 12.Optical splitter D connects the delivery outlet of the channel-splitting filter DMUX of optical transmission system 1, the light signal of channel-splitting filter DMUX delivery outlet is divided into two-way through optical splitter D, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, recovers pulse triggering signal by trigger T again, adjust postponing δ τ through the adjustable delay device, determine suitable trigger point, trigger spectrometer.Command generator I produces instruction, gives control impuls generator C by data communication network DCN on the one hand, makes it to produce control impuls; Deliver to spectrometer M on the other hand.Spectrometer is received the instruction of command generator I, tests.
Fig. 6 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band.Fig. 6 can be used for that the OSNR to optical transmission system tests under field condition or the factory condition.Comprise optical switch S and light optical splitter D in the optical transmission system 2, and reserved test point F1 and F2.Control impuls generator C passes through tested points F1 inserts, and control optical switch S opens/turn-offs, and produces the pulsed light of certain frequency, shown in the K output average light power of Figure 12.Test point F2 meets optical splitter D, be divided into two-way, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, recovers pulse triggering signal by trigger T again, adjust postponing δ τ through the adjustable delay device, determine suitable trigger point, trigger spectrometer.Command generator I produces instruction, gives control impuls generator C by data communication network DCN on the one hand, makes it to produce control impuls; Give spectrometer M on the other hand.Spectrometer is received the instruction of command generator I, tests.
Fig. 7 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the factory condition optical amplifier transmission link band.Fig. 7 can be used for that the OSNR to optical transmission system tests under the factory condition.Comprise optical switch S in the optical transmission system, and reserved test point F1 and F2.Control impuls generator C passes through tested points F1 inserts, and control optical switch S opens/turn-offs, and produces the pulsed light of certain frequency, shown in the K output average light power of Figure 12.Test point F2 meets optical splitter D, be divided into two-way, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, recovers pulse triggering signal by trigger T again, adjust postponing δ τ through the adjustable delay device, determine suitable trigger point, trigger spectrometer.Command generator I produces instruction, gives control impuls generator C on the one hand, produces control impuls; Deliver to spectrometer M on the other hand.Spectrometer M receives the instruction of command generator I, tests.
Fig. 8 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the factory condition optical amplifier transmission link band.Fig. 8 can be used for factory condition to be tested the OSNR of optical transmission system.Comprise optical switch S in the optical transmission system 2, and reserved test point F1 and F2.Control impuls generator C passes through tested points F1 inserts, and control optical switch S opens/turn-offs, and produces the pulsed light of certain frequency, shown in the K output average light power of Figure 12.Test point F2 connects spectrometer.The pulse that control impuls generator C produces is postponing τ
0After, give trigger T, adjust postponing δ τ through the adjustable delay device again, determine suitable trigger point, trigger spectrometer and test.As Figure 12, τ
0It is the delay that control impuls generator C generation pulse signal and pulsed optical signals are transferred to test point F2.
Fig. 9 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band.Fig. 9 can be used for that the OSNR to optical transmission system 2 tests under field condition or the factory condition.Comprise optical switch S in the optical transmission system 2, and reserved test point F1 and F2.Control impuls generator C passes through tested points F1 inserts, and control optical switch S opens/turn-offs, and produces the pulsed light of certain frequency, shown in the K output average light power of Figure 12.Test point F2 connects spectrometer.Command generator I produces instruction, by data communication network DCN, gives control impuls generator C on the one hand, produces control signal; Control produces and postpones τ on the other hand
0, give trigger T, adjust postponing δ τ through the adjustable delay device again, determine suitable trigger point, trigger spectrometer and test.As Figure 12, τ
0It is the delay that control impuls generator C generation pulse signal and pulsed optical signals are transferred to test point F2.
Figure 10 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the field condition optical amplifier transmission link band.Figure 10 can be used for that the OSNR to optical transmission system 2 tests under field condition or the factory condition.Comprise optical switch S in the optical transmission system 2, and reserved test point F1.Control impuls generator C passes through tested points F1 inserts, and control optical switch S opens/turn-offs, and produces the pulsed light of certain frequency, shown in the K output average light power of Figure 12.Optical splitter D connects the test port of optical transmission system 2, and the light signal of test port is divided into two-way, one the tunnel sends into the light signal test port of spectrometer M, one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, comparator B is the signal of telecommunication after system transmissions and the signal delay of control impuls generator C ' relatively, obtains postponing τ
0, control impuls generator C ' postpones τ
0, adjust postponing δ τ through the adjustable delay device again, determine suitable trigger point, trigger spectrometer.Command generator I produces instruction, on the one hand by data communication network DCN, gives control impuls generator C and produces control signal; Give control impuls generator C ' and spectrometer M on the other hand respectively, spectrometer is received instruction and is tested.
Figure 11 is an embodiment of Optical Signal To Noise Ratio testing apparatus in the factory condition optical amplifier transmission link band.Figure 11 can be used for factory condition to be tested the OSNR of optical transmission system 2.Comprise optical switch S in the optical transmission system 2, and reserved test point F1.Control impuls generator C passes through tested points F1 inserts, and control optical switch S opens/turn-offs, and produces the pulsed light of certain frequency, shown in the K output average light power of Figure 12.Optical splitter D connects the test port of optical transmission system 2, and the light signal of test port is divided into two-way, one the tunnel sends into the light signal test port of spectrometer M, one the tunnel sends into photoelectric transformer O/E, light signal is converted to the signal of telecommunication, comparator B is the delay of the signal of the signal of telecommunication after system transmissions and control impuls generator C relatively, obtains postponing τ
0, control impuls generator C postpones τ
0, adjust postponing δ τ through the adjustable delay device again, determine suitable trigger point, trigger spectrometer M.Command generator I produces instruction, gives control impuls generator C on the one hand and produces control signal, gives spectrometer M on the other hand, and spectrometer M receives instruction and tests.
The K output average light power of Figure 12 is the output average light power of the pulsed optical signals of pulsed optical signals generator K output.The T input control signal is the pulse control signal of trigger T output.M input average light power is the average light power of the input signal of spectrometer M.M input triggering signal is the triggering signal that inputs to spectrometer M.M test point value is the schematic diagram of the spectrometer M light signal that test obtains under the control of input triggering signal.
Claims (7)
1. the interior Optical Signal To Noise Ratio testing apparatus of optical amplifier transmission link band is characterized in that, comprises pulsed optical signals generator, optical splitter, photoelectric transformer, trigger, variable delay device, spectrometer;
The pulsed optical signals generator inserts system under test (SUT) before the optical sender input of optical transmission system or before wave multiplexer input or the wave multiplexer output image intensifer; Optical splitter connects the light mouth after optical transmission system transmission, two delivery outlets of optical splitter, and one connects spectrometer, and one connects described spectrometer again through photoelectric transformer, trigger, variable delay device.
2. Optical Signal To Noise Ratio testing apparatus in the described optical amplifier transmission link band of claim 1, it is characterized in that, also comprise command generator, the pulsed optical signals generator comprises control impuls generator and optical switch, the control impuls generator is connected with optical switch, control opening/turn-offing of optical switch, optical switch is connected with the output of optical sender or the output of wave multiplexer; Described command generator produces instruction, gives the control impuls generator or gives the control impuls generator by data communication network on the one hand, makes it to produce control impuls; Deliver to spectrometer on the other hand.
3. Optical Signal To Noise Ratio testing apparatus in the described optical amplifier transmission link band of claim 2, it is characterized in that, also comprise a comparator, the control impuls generator is controlled opening/turn-offing of optical switch, produce the pulsed light of certain frequency, optical splitter is divided into two-way with the light signal of test port, and one the tunnel sends into the light signal test port of spectrometer, and one the tunnel sends into photoelectric transformer, light signal is converted to the signal of telecommunication, comparator is the delay of the signal of the signal of telecommunication after system transmissions and control impuls generator relatively, obtains retardation, and the control impuls generator postpones this retardation, give trigger, adjust postponing through the adjustable delay device again, determine the trigger point, trigger spectrometer; Command generator produces instruction, gives the control impuls generator on the one hand and produces control signal, gives spectrometer on the other hand, and spectrometer is received instruction and tested.
4. Optical Signal To Noise Ratio testing apparatus in the described optical amplifier transmission link band of claim 2 is characterized in that, also comprises the comparator and the second control impuls generator; The control impuls generator is controlled opening/turn-offing of optical switch, produce the pulsed light of certain frequency, optical splitter is divided into two-way with the light signal of test port, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer, light signal is converted to the signal of telecommunication, comparator is the signal of telecommunication after system transmissions and the signal delay of the second control impuls generator relatively, obtain retardation, the second control impuls generator postpones this retardation, gives trigger, adjusts postponing through the adjustable delay device again, determine the trigger point, trigger spectrometer; Command generator produces instruction, on the one hand by data communication network, gives the control impuls generator and produces control signal; Give second control impuls generator and the spectrometer on the other hand respectively, spectrometer is received instruction and is tested.
5. the method for the interior Optical Signal To Noise Ratio of photometry amplifier transmission link band is characterized in that, comprises step:
Produce and export the pulsed light of certain frequency at transmitting terminal;
Output light signal through system transmissions is divided into two-way through optical splitter, one the tunnel sends into the light signal test port of spectrometer, one the tunnel sends into photoelectric transformer, light signal is converted to the signal of telecommunication, recover pulse signal through trigger again, adjust postponing through the adjustable delay device again, determine the trigger point, trigger spectrometer;
Luminous power P1 when elder generation's test light signal is opened, the luminous power P2 when the test light signal turn-offs again; Spectrometer calculating Optical Signal To Noise Ratio=signal/noise=(P1-P2)/P2.
6. the method for Optical Signal To Noise Ratio in the described photometry amplifier of the claim 5 transmission link band is characterized in that,
Spectrometer carries out spectral scan under the control of the start pulse signal that recovers, the integral light power P 1 that the path central wavelength obtained when the test light signal was opened, the integral light power P 2 that the path central wavelength obtained when light signal turn-offed.
7. the method for Optical Signal To Noise Ratio in the described photometry amplifier of the claim 6 transmission link band is characterized in that,
Described integral light power is included in the integration of periodic sampling under the definite retardation condition; Or the integration of under a variable retardation condition, repeatedly sampling.
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| CN108365889B (en) * | 2018-02-28 | 2020-02-14 | 武汉光迅科技股份有限公司 | Method for improving OSNR accuracy of wavelength division multiplexing system |
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| CN1411196A (en) * | 2001-09-22 | 2003-04-16 | 三星电子株式会社 | Method for monitoring optical signal performance in interleaving system and apparatus thereof |
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