CN112929093B - OAM signal top-adjusting circuit - Google Patents
OAM signal top-adjusting circuit Download PDFInfo
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- CN112929093B CN112929093B CN202110213978.6A CN202110213978A CN112929093B CN 112929093 B CN112929093 B CN 112929093B CN 202110213978 A CN202110213978 A CN 202110213978A CN 112929093 B CN112929093 B CN 112929093B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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Abstract
The invention relates to an OAM signal top-tuning circuit which comprises an amplifying unit, a laser unit connected with the amplifying unit and a modulating unit, wherein the modulating unit comprises a first modulating resistor, a second modulating resistor and a loop switch, one end of the first modulating resistor and one end of the loop switch are respectively connected with the input end of the amplifying unit, the other end of the first modulating resistor is connected with APC voltage, the other end of the loop switch is connected with one end of the second modulating resistor, the other end of the second modulating resistor is grounded, and the ratio of the first modulating resistor to the sum of the first modulating resistor and the second modulating resistor is 3% -5%. The invention takes the backlight current of the laser as feedback, controls the amplitude of the top adjustment in a closed loop manner, and can ensure that the amplitude of the top adjustment in the whole life cycle is kept unchanged. The voltage division ratio of the first modulation resistor and the second modulation resistor is adjusted, or the amplitude of the adjustable top regulation of the OAM voltage is changed, so that the production is simple and convenient, the production time can be saved, the complexity of a production system can be reduced, and the production cost can be saved.
Description
Technical Field
The invention relates to the technical field of communication tuning, in particular to an OAM signal top-tuning circuit.
Background
When the optical fiber is in operation, a wireless operator expects an OAM (operation administration and maintenance) channel to be arranged between the transmitting end and the receiving end of the optical module, and a data rate channel of 1kb/s or 10kb/s of Manchester coding is required to be used for allowing communication of OAM basic information, and the OAM basic information is mainly used for supporting end-to-end monitoring and management of the optical module through an optical path.
In a traditional mode, the proportion of the Bias current of the laser in the optical module is controlled to be the vertex-adjusting amplitude, so that the influence of the laser Ith on the vertex-adjusting proportion and the influence of the laser Ith on the vertex-adjusting proportion caused by the change of the laser Ith due to aging cannot be eliminated. And a plurality of temperature points need to be debugged, and temperature compensation is carried out by matching with a lookup table, so that the production debugging system is complex and the production time is long.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an OAM signal top-adjusting circuit.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the utility model provides a OAM signal top-tuning circuit, includes the amplifying unit, the laser unit of being connected with the amplifying unit, still includes the modulating unit, the modulating unit includes first modulation resistance, second modulation resistance, return circuit switch, the one end of first modulation resistance, return circuit switch's one end respectively with the input of amplifying unit is connected, APC voltage is inserted to the other end of first modulation resistance, and return circuit switch's the other end is connected with the one end of second modulation resistance, and the other end ground connection of second modulation resistance, and the ratio of the sum of first modulation resistance and second modulation resistance of first modulation resistance is 3% ~5%.
As an implementable manner, in this solution, the tuning amplitude is modulated by setting the resistance ratio of the first modulation resistor and the second modulation resistor, so that the magnitude of the voltage signal fed back by the laser unit is equal to the magnitude of the modulation voltage signal received by the amplification unit, thereby achieving the purpose of APC tuning.
Preferably, the loop switch is connected with an alternating current power supply, and the output frequency of the alternating current power supply is 2kHz or 20KHz. According to the regulation and agreement of the operator, the tuning is completed under the conditions of 2kHz and 20kHz frequencies.
Preferably, the ratio of the first modulation resistance to the sum of the first modulation resistance and the second modulation resistance is 4%.
When the loop switch is turned off, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
APCset＝DAC_APCset (1)
in the formula (1), DAC _ APCset is the APC voltage that the first modulation resistor is connected;
when the loop switch is closed, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
in the formula (2), R1 is a resistance value of the first modulation resistor, and R2 is a resistance value of the second modulation resistor.
As another possible implementation, the other end of the second modulation resistor is replaced by the ground to be connected to the DAC _ OAMset voltage.
In the scheme, modulation and top modulation amplitude can be realized by adjusting the input OAM voltage signal only by the condition that the resistance value of the first modulation resistor is smaller than that of the second modulation resistor.
When the loop switch is turned off, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
APCset＝DAC_APCset (3)
in the formula (3), DAC _ APCset is the APC voltage that the first modulation resistor is connected;
when the switch loop is closed, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
in the formula (4), R1 is a resistance value of the first modulation resistor, R2 is a resistance value of the second modulation resistor, and DAC _ OAMset is an OAM setting voltage accessed by the second modulation resistor.
Furthermore, the amplifying unit comprises an amplifier and a triode, one end of the first modulating resistor and one end of the second modulating resistor are respectively connected with the positive phase input end of the amplifier, the output end of the amplifier is connected with the base electrode of the triode, and the emitting electrode of the triode is connected with the laser unit.
Furthermore, the laser unit comprises a laser diode and a backlight receiver, wherein an emitter of the triode is connected with the laser diode, and the backlight receiver receives the output optical power of the laser diode.
Compared with the prior art, the invention has the beneficial effects that:
the invention takes the backlight current of the laser as feedback to control the peak-adjusting amplitude in a closed loop manner, thereby ensuring that the peak-adjusting amplitude in the whole life cycle is kept unchanged. The voltage division ratio of the first modulation resistor and the second modulation resistor is adjusted, or the amplitude of the adjustable top regulation is adjusted by changing the OAM voltage (DAC _ OAMset), so that the production is simple and convenient, the production time can be saved, the complexity of a production system can be reduced, and the production cost can be saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a tuning circuit according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a tuning circuit according to embodiment 2 of the present invention;
FIG. 3 is a waveform of current outputted when the AC power supply (VG 1) is 20 kHz;
FIG. 4 shows a waveform of current outputted when the AC power supply (VG 1) is 2 kHz.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Also, in the description of the present invention, the terms "first", "second", and the like are used for distinguishing between descriptions and not necessarily for describing a relative importance or implying any actual relationship or order between such entities or operations.
Example 1:
as an implementation manner, please refer to fig. 1, an OAM signal top-modulation circuit includes an amplifying unit, a laser unit connected to the amplifying unit, and a modulating unit, where the modulating unit includes a first modulating resistor (R1), a second modulating resistor (R2), and a loop switch (SW 1), and a ratio of the first modulating resistor (R1) to a sum of the first modulating resistor (R1) and the second modulating resistor (R2) is 3% to 5% (a top-modulation ratio index is derived from a standard of "chinese mobile Open-WDM specification V1.8"). The amplifying unit comprises an amplifier (U1) and a triode (T1), and the laser unit comprises a light emitting diode (LD) and a backlight receiving tube (PD).
One end of the first modulation resistor (R1) and one end of the loop switch (SW 1) are respectively connected with the positive phase input end of the amplifier (U1), the other end of the first modulation resistor (R1) is connected with the APC voltage (DAC _ APCset), the other end of the loop switch (SW 1) is connected with one end of the second modulation resistor (R2), and the other end of the second modulation resistor (R2) is grounded.
The output end of the amplifier (U1) is connected with one end of a fourth resistor (R4), the other end of the fourth resistor (R4) is connected with the base electrode of the triode (T1), the emitting electrode of the triode (T1) is connected with the anode of the light-emitting diode (LD), and the cathode of the light-emitting diode (LD) is grounded. The backlight receiving tube (PD) receives the output light power of the light emitting diode (LD) and outputs a feedback signal (TxPD _ FB) after being sampled by the eighth sampling resistor (R8).
The collector electrode of the triode (T1) is connected with one end of a fifth resistor (R5), the other end of the fifth resistor (R5) is connected with a power supply (VLaser) of the light-emitting diode (LD) and a power supply battery, and the voltage of the power supply battery is 2.3V.
The inverting input end of the amplifier (U1) is connected with one end of a third resistor (R3) and one end of a first capacitor (C1) respectively, the other end of the third resistor (R3) is connected into a feedback signal (TxPD _ FB) of the backlight receiving tube (PD), and the other end of the first capacitor (C1) is connected with the output end of the amplifier (U1).
The loop switch (SW 1) is connected with an alternating current power supply (VG 1), the opening and closing of the loop switch (SW 1) is controlled by the alternating current power supply (VG 1), for example, when the alternating current power supply (VG 1) outputs positive half cycle, the loop switch (SW 1) is closed, and when the alternating current power supply (VG 1) outputs negative half cycle, the loop switch (SW 1) is opened. The scheme sets the output frequency of the alternating current power supply (SW 1) to be 2kHz or 20kHz.
In the present embodiment, it is preferable that the ratio of the first modulation resistance (R1) to the sum of the first modulation resistance (R1) and the second modulation resistance (R2) is 4%, that is, it is preferable that
Corresponding to a ratio of the second modulation resistor (R2) to the sum of the first modulation resistor (R1) and the second modulation resistor (R2) of 96%, i.e. < >>
Assume that the resistance of the first modulation resistor (R1) is selected to be 100 Ω, and the resistance of the second modulation resistor (R2) is selected to be 2400 Ω.
When the loop switch (SW 1) is turned off, the voltage APCset output to the amplifier (U1) by the modulation unit is as follows:
APCset＝DAC_APCset (1)
in the formula (1), DAC _ APCset is APC voltage connected to the first modulation resistor (R1);
when the loop switch (SW 1) is closed, the voltage APCset output to the amplifier (U1) by the modulation unit is as follows:
in the formula (2), R1 is the resistance of the first modulation resistor (R1), and R2 is the resistance of the second modulation resistor (R2).
The amplifier (U1) is an integrating operational amplifier, the APC voltage (DAC _ APCset) at the positive input end of the amplifier (U1) is compared with the feedback signal (TxPD _ FB) at the negative input end, a control voltage is output, the base current of the triode (T1) is controlled, and therefore the output light power of the Laser (LD) is controlled, the feedback voltage (TxPD _ FB) generated after the photocurrent of the backlight receiving tube (PD) flows through the eighth sampling resistor (R8) is equal to the APC voltage (DAC _ APCset) at the positive input end of the amplifier (U1), and the purpose of APC control and top adjustment (APC: automatic power control) is achieved.
The current waveforms of the voltage signals generated by the backlight receiver (PD) are shown in fig. 3 and 4, where fig. 3 is a current waveform of the feedback voltage (TxPD _ FB) output when the ac power supply (VG 1) is 20kHz, and fig. 4 is a current waveform of the feedback voltage (TxPD _ FB) output when the ac power supply (VG 1) is 2 kHz. The simulation results of the current waveform are used for illustrating that the circuit can support two modulation frequencies of 2kHz and 20kHz.
In this embodiment, the amplitude of the tuning is adjusted by dividing the voltage through resistors (selecting the ratio of the first modulation resistor to the second modulation resistor) without changing the connected APC voltage.
Example 2:
as another possible implementation manner, please refer to fig. 2, an OAM signal vertex-adjusting circuit includes an amplifying unit, a laser unit connected to the amplifying unit, and a modulating unit, where the modulating unit includes a first modulating resistor (R1), a second modulating resistor (R2), and a loop switch (SW 1), and a resistance of the first modulating resistor (R1) is smaller than a resistance of the second modulating resistor (R2). And selecting a proper resistance value according to the proportion of the proportion calculation formula according to the required roof-adjusting proportion. The amplifying unit comprises an amplifier (U1) and a triode (T1), and the laser unit comprises a light emitting diode (LD) and a backlight receiving tube (PD).
One end of the first modulation resistor (R1) and one end of the loop switch (SW 1) are respectively connected with a positive phase input end of the amplifier (U1), the other end of the first modulation resistor (R1) is connected with the APC voltage (DAC _ APCset), the other end of the loop switch (SW 1) is connected with one end of the second modulation resistor (R2), and the other end of the second modulation resistor (R2) is connected with the OAM voltage.
The output end of the amplifier (U1) is connected with one end of a fourth resistor (R4), the other end of the fourth resistor (R4) is connected with the base electrode of the triode (T1), the emitting electrode of the triode (T1) is connected with the anode of the light-emitting diode (LD), and the cathode of the light-emitting diode (LD) is grounded. The backlight receiving tube (PD) receives the output optical power of the light emitting diode (LD), outputs a feedback signal (TxPD _ FB) and outputs a top-adjusting signal (VF 1) through an eighth sampling resistor (R8).
The collector electrode of the triode (T1) is connected with one end of a fifth resistor (R5), the other end of the fifth resistor (R5) is connected with a power supply (VLaser) of the light-emitting diode (LD) and a power supply battery, and the voltage of the power supply battery is 2.3V.
The inverting input end of the amplifier (U1) is connected with one end of a third resistor (R3) and one end of a first capacitor (C1) respectively, the other end of the third resistor (R3) is connected into a feedback signal (TxPD _ FB) of the backlight receiving tube (PD), and the other end of the first capacitor (C1) is connected with the output end of the amplifier (U1).
The circuit switch (SW 1) is connected with an alternating current power supply (VG 1), the opening and closing of the circuit switch (SW 1) are controlled by the alternating current power supply (VG 1), for example, when the alternating current power supply (VG 1) outputs positive half cycle, the circuit switch (SW 1) is closed, and when the alternating current power supply (VG 1) outputs negative half cycle, the circuit switch (SW 1) is opened. The output frequency of the alternating current power supply (SW 1) is 2kHz or 20kHz.
In this embodiment, the ratio of the first modulation resistor (R1) to the second modulation resistor (R2) is not limited, the resistance of the first modulation resistor (R1) is only required to be smaller than that of the second modulation resistor (R2), and the voltage value connected to the positive-phase input terminal of the amplifier (U1) can be adjusted by adjusting the connected OAM voltage.
When the loop switch (SW 1) is turned off, the voltage APCset output to the amplifier (U1) by the modulation unit is as follows:
APCset＝DAC_APCset (3)
in the formula (3), DAC _ APCset is the APC voltage that the first modulation resistor (R1) is connected;
when the switch loop (SW 1) is closed, the voltage APCset output to the amplifier (U1) by the modulation unit is as follows:
in the formula (4), R1 is a resistance value of the first modulation resistor (R1), R2 is a resistance value of the second modulation resistor (R2), and DAC _ OAMset is an OAM voltage accessed by the second modulation resistor (R2).
In this embodiment, assuming that the resistance of the first modulation resistor (R1) is 1k Ω, the resistance of the second modulation resistor (R2) is 10k Ω, the voltage of the connected APC is 1V, the loop switch (SW 1) is closed, and the voltage value finally output to the amplifier (U1) is controlled to be 95% to 97% of the APCset when the loop switch (SW 1) is open by adjusting the voltage value of the connected OAM, as shown in table 1:
| R1(kΩ) | R2(kΩ) | DAC_APCset(V) | DAC_OAMset(V) | OMASet(％) |
| 1 | 10 | 1 | 0.56 | 4.00％ |
| 1 | 10 | 1 | 0.67 | 3.00％ |
| 1 | 10 | 1 | 0.45 | 5.00％ |
TABLE 1
In this embodiment, the amplitude of the peak-to-peak modulation is modulated by varying the OAM voltage (DAC _ OAMset).
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An OAM signal top-tuning circuit comprises an amplifying unit and a laser unit connected with the amplifying unit, and is characterized in that: the circuit comprises an amplifying unit, a modulation unit and a control unit, wherein the modulation unit comprises a first modulation resistor, a second modulation resistor and a loop switch, one end of the first modulation resistor and one end of the loop switch are respectively connected with the input end of the amplifying unit, the other end of the first modulation resistor is connected to APC voltage, the other end of the loop switch is connected with one end of the second modulation resistor, the other end of the second modulation resistor is grounded, and the ratio of the first modulation resistor to the sum of the first modulation resistor and the second modulation resistor is 3% -5%;
the amplitude of the top modulation is modulated by setting the resistance ratio of the first modulation resistor and the second modulation resistor, so that the amplitude of the voltage signal fed back by the laser unit is equal to the amplitude of the modulation voltage signal received by the amplifying unit finally, and the aim of APC (automatic power control) top modulation is fulfilled.
2. The OAM signal settop circuit of claim 1, wherein: the loop switch is connected with an alternating current power supply, and the output frequency of the alternating current power supply is 2kHz or 20KHz.
3. The OAM signal settop circuit of claim 1, wherein: the ratio of the first modulation resistance to the sum of the first modulation resistance and the second modulation resistance is 4%.
4. The OAM signal ceiling termination circuit of claim 3, wherein: when the loop switch is turned off, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
APCset＝DAC_APCset (1)
in the formula (1), DAC _ APCset is the APC voltage that the first modulation resistor is connected;
when the loop switch is closed, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
in the formula (2), R1 is the resistance of the first modulation resistor, and R2 is the resistance of the second modulation resistor.
5. The OAM signal settop circuit of claim 1, wherein: the other end of the second modulation resistor is replaced by a voltage connected into DAC _ OAMset from the ground; and setting the resistance value of the first modulation resistor to be smaller than that of the second modulation resistor, and modulating the top modulation amplitude by adjusting the input OAM voltage signal.
6. The OAM signal ceiling termination circuit of claim 5, wherein: when the loop switch is turned off, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
APCset＝DAC_APCset (3)
in the formula (3), DAC _ APCset is the APC voltage that the first modulation resistor is connected;
when the loop switch is closed, the voltage APCset output to the amplifying unit by the modulating unit is as follows:
in the formula (4), R1 is a resistance value of the first modulation resistor, R2 is a resistance value of the second modulation resistor, and DAC _ OAMset is an OAM setting voltage accessed by the second modulation resistor.
7. The OAM signal ceiling termination circuit of claim 1 or 5, wherein: the amplifying unit comprises an amplifier and a triode, one end of the first modulation resistor and one end of the loop switch are respectively connected with the positive phase input end of the amplifier, the output end of the amplifier is connected with the base electrode of the triode, and the emitting electrode of the triode is connected with the laser unit.
8. The OAM signal settop circuit of claim 7, wherein: the laser unit comprises a laser diode and a backlight receiver, wherein an emitting electrode of the triode is connected with the laser diode, and the backlight receiver receives the output light power of the laser diode.
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