CN112532327B - Method and system for improving received light power indication precision - Google Patents
Method and system for improving received light power indication precision Download PDFInfo
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- CN112532327B CN112532327B CN201910876273.5A CN201910876273A CN112532327B CN 112532327 B CN112532327 B CN 112532327B CN 201910876273 A CN201910876273 A CN 201910876273A CN 112532327 B CN112532327 B CN 112532327B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/23—Indication means, e.g. displays, alarms, audible means
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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
- H04B10/25—Arrangements specific to fibre transmission
Abstract
The invention discloses a method and a system for improving the indication precision of received optical power, which relate to the technical field of optical communication, and the method comprises the following steps: converting the first photocurrent detected by the receiving side into voltage, and amplifying according to a preset first amplification factor to obtain first voltage; converting the second photocurrent detected by the transmitting side into a voltage, and amplifying the voltage according to a preset second amplification factor to obtain a second voltage, wherein the first amplification factor and the second amplification factor are configured to: adding the first voltage and the second voltage and eliminating the influence of the light splitting ratio on detection; the first voltage and the second voltage are added and then used for receiving light power indication. The invention can eliminate the influence caused by the change of the splitting ratio so as to improve the indication precision of the light receiving power.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a method and a system for improving the indication precision of received optical power.
Background
The field of optical communication technology has developed rapidly in the near future, and 100G optical transmission is widely used in commercial use. The main force for realizing long-distance transmission of the 100G OTN line is a 100G coherent optical module. Silicon optical technology has been rapidly developed on 100G coherent optical devices due to its great advantages in cost and integration.
The silicon optical coherent integrated device integrates a coherent receiver and a coherent modulator. The volume is greatly reduced after the integration, but the problem of low receiving optical power indication sensitivity exists. The main reasons are as follows: the input light of an external light source is split by a light splitting structure on a silicon optical chip, one path of light is distributed to a coherent modulator for electro-optical modulation, and the other path of light is distributed to a coherent receiver to be used as local oscillation light to interfere with signal light input to the coherent receiver. The signal light of the coherent receiver is detected by a built-in detection device, and because the internal space is very small, a certain small proportion of local oscillation light can irradiate a photosensitive surface of the built-in detection device, so that the detection device receives a certain proportion of local oscillation light. This light affects the detection accuracy of the signal light by the detection device, and thus affects the accuracy of the signal received light power indication. Due to the defect of the light splitting structure of the silicon optical integrated device, the split ratio is very sensitive to the temperature, the split local oscillator light is in jitter change all the time, the power of interference light received by the detection device is in fluctuation all the time, and the sensitivity of signal receiving light power indication cannot be improved by a method of subtracting a local oscillator light interference constant.
Disclosure of Invention
In view of the defects in the prior art, an object of the present invention is to provide a method for improving the indication accuracy of received optical power, which can eliminate the influence caused by the change of the splitting ratio, thereby improving the indication accuracy of received optical power.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a method for improving the accuracy of received optical power indication, the method comprising the steps of:
converting the first photocurrent detected by the receiving side into voltage, and amplifying according to a preset first amplification factor to obtain first voltage;
converting the second photocurrent detected by the transmitting side into a voltage, and amplifying the voltage according to a preset second amplification factor to obtain a second voltage, wherein the first amplification factor and the second amplification factor are configured to: adding the first voltage and the second voltage and eliminating the influence of the light splitting ratio on detection;
the first voltage and the second voltage are added and then used for receiving light power indication.
On the basis of the technical proposal, the device comprises a shell,
according to formula Impd_Rx＝β*(Xtalk(1-αTx)PITLA+Psig) Determining a magnitude of the detected first photocurrent;
according to formula Impd_Tx＝β*IL*αTx*PITLADetermining a magnitude of the detected second photocurrent;
wherein, Impd_RxIs the magnitude of the first photocurrent, Impd_TxIs the magnitude of the second photocurrent, beta is the responsivity of MPD, XtalkIs a fixed crosstalk value, alphaTxIs the splitting ratio, PITLAFor inputting the optical power of silicon optical coherence integrated devices, PsigIL is the insertion loss coefficient of the coherent modulator.
In the aboveOn the basis of the technical scheme, the first magnification is N times of IL, and the second magnification is XtalkN times, where N is a positive integer.
On the basis of the technical scheme, the first photocurrent is converted into voltage through the first transimpedance amplifier, and the voltage is amplified by taking the resistance value of the first resistor of the first transimpedance amplifier as a multiple to obtain the first voltage, wherein the resistance value of the first resistor is N times of IL.
On the basis of the technical scheme, the second photocurrent is converted into voltage through the second transimpedance amplifier, and the voltage is amplified by taking the resistance value of a second resistor of the second transimpedance amplifier as a multiple to obtain second voltage, wherein the resistance value of the second resistor is XtalkN times.
The invention aims to provide a system for improving the indication precision of received light power, which can eliminate the influence caused by the change of a splitting ratio and improve the indication precision of the received light power.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a system for improving the accuracy of received optical power indication, the method comprising the steps of:
first detecting means for detecting a magnitude of the first photocurrent;
the input end of the first amplifier is connected with the output end of the first detection device, and the first amplifier is used for converting the first photocurrent into voltage and amplifying the voltage according to a preset first amplification factor to obtain a first voltage;
second detecting means for detecting a magnitude of the second photocurrent;
a second amplifier, an input end of which is connected to an output end of the second detection device, the second amplifier being configured to convert the second photocurrent into a voltage, and amplify the second photocurrent according to a preset second amplification factor to obtain a second voltage, wherein the first amplification factor and the second amplification factor are configured to: adding the first voltage and the second voltage, and eliminating the influence of light splitting ratio on detection; and
and the input ends of the adders are respectively connected with the output ends of the first amplifier and the second amplifier, and the adders are used for adding the first voltage and the second voltage.
On the basis of the technical proposal, the device comprises a shell,
the first detecting device is according to formula Impd_Rx＝β*(Xtalk(1-αTx)PITLA+Psig) Determining a magnitude of the detected first photocurrent;
the second detecting device is according to formula Impd_Tx＝β*IL*αTx*PITLADetermining a magnitude of the detected second photocurrent;
wherein, Impd_RxIs the magnitude of the first photocurrent, Impd_TxIs the magnitude of the second photocurrent, beta is the responsivity of MPD, XtalkIs a fixed crosstalk value, alphaTxIs the splitting ratio, PITLAFor inputting the optical power of silicon optical coherence integrated devices, PsigIL is the insertion loss coefficient of the coherent modulator.
On the basis of the technical scheme, the first magnification is N times of IL, and the second magnification is X timestalkWherein N is a positive integer.
On the basis of the above technical solution, the first amplifier is a first transimpedance amplifier, the first transimpedance amplifier is configured to convert the first photocurrent into a voltage, and amplify the first photocurrent by using a resistance value of a first resistor of the first transimpedance amplifier as a multiple to obtain a first voltage, and the resistance value of the first resistor is N times of IL.
On the basis of the above technical scheme, the second amplifier is a second transimpedance amplifier, the second transimpedance amplifier is configured to convert the second photocurrent into a voltage, and amplify the second photocurrent by using a resistance value of a second resistor of the second transimpedance amplifier as a multiple to obtain a second voltage, and the resistance value of the second resistor is XtalkN times.
Compared with the prior art, the invention has the advantages that:
the method for improving the indication precision of the received optical power in the invention outputs the optical power of the coherent modulatorThe method is considered with the local oscillation optical power of the coherent receiver as a whole, a first voltage and a second voltage are obtained by converting and amplifying the detected first photocurrent and second photocurrent into voltages, and then the first voltage and the second voltage are added and then used for receiving optical power indication, namely alpha can be eliminatedTxThe influence brought by the method further improves the indication precision of the received optical power.
Drawings
Fig. 1 is a flowchart of a method for improving received optical power indication accuracy according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention;
fig. 3 is a block diagram of a system for improving received optical power indication accuracy according to an embodiment of the present invention.
In the figure: 1-a first detection device; 2-a first amplifier; 3-a second detection device; 4-a second amplifier; 5-adder.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a method for improving received optical power indication accuracy, where the method includes the following steps:
s1, converting a first photocurrent detected by a receiving side into a voltage, and amplifying according to a preset first amplification factor to obtain a first voltage.
S2, converting the second photocurrent detected by the transmitting side into voltage, and amplifying according to a preset second amplification factor to obtain a second voltage, wherein the first amplification factor and the second amplification factor are configured as follows: and eliminating the influence of the light splitting ratio on detection after the first voltage and the second voltage are added.
And S3, adding the first voltage and the second voltage and then using the sum for light receiving power indication.
Specifically, in the present embodiment, the first photocurrent is mainly detected by the detection devices on the receiving side and the transmitting side, the detection device on the receiving side may be mpd _ Rx (photo detection photodiode) built in the coherent receiver, and the detection device on the transmitting side may be mpd _ Tx built in the coherent modulator. Thus, the magnitudes of the first photocurrent and the second photocurrent may be determined by mpd _ Rx and mpd _ Tx.
In particular, according to formula Impd_Rx＝β*(Xtalk(1-αTx)PITLA+Psig) Determining a magnitude of the detected first photocurrent;
according to formula Impd_Tx＝β*IL*αTx*PITLADetermining a magnitude of the detected second photocurrent;
wherein, Impd_RxIs the magnitude of the first photocurrent, Impd_TxIs the magnitude of the second photocurrent, beta is the responsivity of MPD, XtalkIs a fixed crosstalk value, alphaTxIs the splitting ratio, PITLAFor inputting the optical power of silicon optical coherence integrated devices, PsigFor the intensity of the signal light, i.e. the light signal that the coherent receiver Rx needs to demodulate, IL is the insertion loss coefficient of the coherent modulator.
After the magnitudes of the first photocurrent and the second photocurrent are obtained, the first photocurrent and the second photocurrent may be converted into a voltage by an amplifier and amplified. In this embodiment, requirements are set for the first amplification factor and the second amplification factor, which must satisfy the requirement that the influence of the spectral ratio on the detection is eliminated after the first voltage and the second voltage are added.
Specific principle referring to fig. 2, the optical power P of the silicon optical coherence integrated device is input in fig. 2ITLAThe light is split by a light splitting structure on a silicon optical chip, and one path of light is split to a coherent modulator, namely alphaTx*PITLA(ii) a Then after passing through the coherent modulator Tx, the final output optical power is P due to the insertion loss coefficient of the coherent modulator Txmpd_Tx＝IL*αTx*PITLA. The other light is split into coherent receivers Rx, i.e. (1-alpha)Tx)*PITLA(ii) a However, (1-. alpha.) due to the small inner spaceTx)*PITLAA certain small proportion of the partial light can shine on a built-in photosensitive surface of the mpd _ Rx, so that the mpd _ Rx receives a certain proportion of local oscillator light Xtalk(1-αTx)PITLAResulting in an optical power P detected by mpd _ Rxmpd_Rx＝Xtalk(1-αTx)PITLA+Psig. But for Xtalk(1-αTx)PITLAThe partial local oscillator light causes that the split ratio is very sensitive to the temperature due to the defect of the split structure of the silicon optical integrated device, the split local oscillator light is in jitter change all the time, the power of interference light received by the mpd _ Rx is in fluctuation all the time, and the optical power detected by the mpd _ Rx is in fluctuation all the time, and the X is the Xtalk(1-αTx)PITLAThe signal receiving optical power indication sensitivity cannot be improved by subtracting a local oscillator optical interference constant from the indication formula.
However, the output optical power of the coherent modulator and the local oscillator optical power of the coherent receiver fluctuate complementarily because the reason for fluctuation of the output optical power of the coherent modulator and the local oscillator optical power of the receiver is that the splitting ratio of the spectrometer fluctuates due to temperature.
The embodiment considers the output optical power of the coherent modulator and the local oscillation optical power of the coherent receiver as a whole, and based on the principle of complementation, reasonably sets the multiples of the two amplifiers, namely the first amplification factor and the second amplification factor are configured as follows: and eliminating the influence of the light splitting ratio on detection after the first voltage and the second voltage are added. Is embodied in the form of alpha referred to in the expressionTxTo be eliminated.
To achieve the above object, the first magnification is N times of IL, and the second magnification is X timestalkWherein N is a positive integer.
In a specific practice, the amplification factor may be implemented by using a transimpedance amplifier, i.e., a resistor of the transimpedance amplifier. The first photocurrent is converted into voltage through the first transimpedance amplifier, and the voltage is amplified by taking the resistance value of a first resistor of the first transimpedance amplifier as a multiple to obtain first voltage, wherein the resistance value of the first resistor is N times of IL. Converting the second photocurrent into a voltage through a second transimpedance amplifier, and amplifying the voltage by taking the resistance of a second resistor of the second transimpedance amplifier as a multiple to obtain a second voltage, wherein the resistance of the second resistor is XtalkN times.
Finally, theThe voltage obtained by adding the first voltage and the second voltage is used for the received light power indication again, i.e. based on Impd_Rx＝β*(Xtalk(1-αTx)PITLA+Psig) And Impd_Tx＝β*IL*αTx*PITLACan obtain
Due to alphaTxThe remaining parameters have been eliminated as fixed values. That is, P corresponding to the voltage obtained by adding the first voltage and the second voltage can be usedmpd_RxTo characterize the intensity of the signal light.
In summary, in the method for improving the received optical power indication accuracy in the present invention, the output optical power of the coherent modulator and the local oscillation optical power of the coherent receiver are considered as a whole, the detected first optical current and the detected second optical current are converted into voltages and amplified to obtain a first voltage and a second voltage, and then the first voltage and the second voltage are added and used for the received optical power indication, so that α can be eliminatedTxThe influence brought by the method further improves the indication precision of the received optical power.
Referring to fig. 3, an embodiment of the present invention provides a system for improving accuracy of received optical power indication, which includes a first detection device 1, a first amplifier 2, a second detection device 3, a second amplifier 4, and an adder 5.
Wherein, the first detection device 1 is used for detecting the magnitude of the first photocurrent.
And the input end of the first amplifier 2 is connected with the output end of the first detection device 1, and the first amplifier 2 is used for converting the first photocurrent into voltage and amplifying the voltage according to a preset first amplification factor to obtain a first voltage.
Second detection means 3 for detecting the magnitude of the second photocurrent;
a second amplifier 4, an input end of which is connected to the output end of the second detection apparatus 3, wherein the second amplifier 4 is configured to convert the second photocurrent into a voltage, and amplify the second photocurrent with a preset second amplification factor to obtain a second voltage, and the first amplification factor and the second amplification factor are configured to: adding the first voltage and the second voltage, and eliminating the influence of light splitting ratio on detection; and
an adder 5, the input terminals of which are connected to the output terminals of the first amplifier 2 and the second amplifier 4, respectively, wherein the adder 5 is configured to add the first voltage and the second voltage.
Preferably, the first detecting means 1 is mpd _ Rx, the first detecting means 1 being according to formula Impd_Rx＝β*(Xtalk(1-αTx)PITLA+Psig) A magnitude of the detected first photocurrent is determined.
The second detection means 3 is mpd _ Tx according to formula Impd_Tx＝β*IL*αTx*PITLAA magnitude of the detected second photocurrent is determined.
Wherein, Impd_RxIs the magnitude of the first photocurrent, Impd_TxIs the magnitude of the second photocurrent, beta is the responsivity of MPD, XtalkIs a fixed crosstalk value, alphaTxIs the splitting ratio, PITLAFor inputting the optical power of silicon optical coherence integrated devices, PsigIL is the insertion loss coefficient of the coherent modulator.
Further, the first magnification is N times of IL, and the second magnification is XtalkWherein N is a positive integer.
Further, the first amplifier 2 is a first transimpedance amplifier, and the first transimpedance amplifier is configured to convert the first photocurrent into a voltage and amplify the voltage by using a resistance value of a first resistor of the first transimpedance amplifier as a multiple to obtain a first voltage VrxAnd the resistance value of the first resistor is N times of IL.
Further, the second amplifier 4 is a second transimpedance amplifier, and the second transimpedance amplifier is configured to convert the second photocurrent into a voltage and amplify the voltage by using a resistance value of a second resistor of the second transimpedance amplifier as a multiple to obtain a second voltage VtxThe resistance value of the second resistor is XtalkN times.
The first voltage V is then applied by means of an adder 5rxAnd a second voltage VtxAdd to obtain a voltage Vrx', will Vrx' for receiving optical power indication, i.e. using Vrx' corresponding Pmpd_RxThe indication precision of the light receiving power can be improved by representing the intensity of the signal light.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (8)
1. A method for improving received optical power indication accuracy, the method comprising:
converting the first photocurrent detected by the receiving side into voltage, and amplifying according to a preset first amplification factor to obtain first voltage;
converting the second photocurrent detected by the transmitting side into a voltage, and amplifying the voltage according to a preset second amplification factor to obtain a second voltage, wherein the first amplification factor and the second amplification factor are configured to: adding the first voltage and the second voltage and eliminating the influence of the light splitting ratio on detection;
adding the first voltage and the second voltage and then using the sum for receiving light power indication;
wherein, according to formula Impd_Rx＝β*(Xtalk(1-αTx)PITLA+Psig) Determining a magnitude of the detected first photocurrent;
according to formula Impd_Tx＝β*IL*αTx*PITLADetermining a magnitude of the detected second photocurrent;
wherein, Impd_RxIs the magnitude of the first photocurrent, Impd_TxIs the magnitude of the second photocurrent, beta is the responsivity of MPD, XtalkIs a fixed crosstalk value, alphaTxIs the splitting ratio, PITLAFor inputting the optical power of silicon optical coherence integrated devices, PsigFor intensity of signal light, IL is coherent modulationThe insertion loss coefficient of the system.
2. The method of claim 1, wherein the received optical power indication precision is improved by: the first magnification is N times of IL, and the second magnification is XtalkWherein N is a positive integer.
3. The method as claimed in claim 2, wherein the method further comprises: the first photocurrent is converted into voltage through the first transimpedance amplifier, and the voltage is amplified by taking the resistance value of a first resistor of the first transimpedance amplifier as a multiple to obtain first voltage, wherein the resistance value of the first resistor is N times of IL.
4. The method as claimed in claim 2, wherein the method further comprises: converting the second photocurrent into a voltage through a second transimpedance amplifier, and amplifying the voltage by taking the resistance of a second resistor of the second transimpedance amplifier as a multiple to obtain a second voltage, wherein the resistance of the second resistor is XtalkN times.
5. A system for improving received optical power indication accuracy, comprising:
first detecting means for detecting a magnitude of the first photocurrent;
the input end of the first amplifier is connected with the output end of the first detection device, and the first amplifier is used for converting the first photocurrent into voltage and amplifying the voltage according to a preset first amplification factor to obtain a first voltage;
second detecting means for detecting a magnitude of the second photocurrent;
a second amplifier, an input end of which is connected to an output end of the second detection device, the second amplifier being configured to convert the second photocurrent into a voltage and amplify the second photocurrent with a preset second amplification factor to obtain a second voltage, wherein the first amplification factor and the second amplification factor are configured to: adding the first voltage and the second voltage, and eliminating the influence of light splitting ratio on detection; and
the input end of the adder is respectively connected with the output ends of the first amplifier and the second amplifier, and the adder is used for adding the first voltage and the second voltage;
and the first detection device is according to formula Impd_Rx＝β*(Xtalk(1-αTx)PITLA+Psig) Determining a magnitude of the detected first photocurrent;
the second detecting device is according to formula Impd_Tx＝β*IL*αTx*PITLADetermining a magnitude of the detected second photocurrent;
wherein, Impd_RxIs the magnitude of the first photocurrent, Impd_TxIs the magnitude of the second photocurrent, beta is the responsivity of MPD, XtalkIs a fixed crosstalk value, αTxAs the splitting ratio, PITLAFor inputting the optical power of silicon optical coherence integrated devices, PsigIL is the insertion loss coefficient of the coherent modulator.
6. The system of claim 5, wherein the received optical power indication precision is improved by: the first magnification is N times of IL, and the second magnification is XtalkWherein N is a positive integer.
7. The system of claim 6, wherein the received optical power indication precision is improved by: the first amplifier is a first transimpedance amplifier, the first transimpedance amplifier is used for converting a first photocurrent into a voltage and amplifying the voltage by taking the resistance value of a first resistor of the first transimpedance amplifier as a multiple to obtain a first voltage, and the resistance value of the first resistor is N times of IL.
8. The system of claim 6, wherein the received optical power indication precision is improved by: the second amplifier is a second transimpedance amplifier for converting the second photocurrent to a voltage and for outputting a first photocurrentAmplifying the resistance value of a second resistor of the second transimpedance amplifier as a multiple to obtain a second voltage, wherein the resistance value of the second resistor is XtalkN times.
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