CN215581185U - OAM (operation administration and maintenance) implementation circuit of multi-carrier amplitude modulation scheme - Google Patents
OAM (operation administration and maintenance) implementation circuit of multi-carrier amplitude modulation scheme Download PDFInfo
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Abstract
The utility model relates to the technical field of carrier amplitude modulation, in particular to an OAM (operation administration and maintenance) realizing circuit of a multi-carrier amplitude modulation scheme, which comprises the following steps: the constant current source circuit comprises a voltage-controlled current source circuit for providing constant current, a signal loading circuit for realizing OAM signal loading and a mirror current source circuit, wherein the signal loading circuit comprises a MOS (metal oxide semiconductor) transistor Q2; the input end of the voltage-controlled current source circuit is connected with a carrier signal, the output end of the voltage-controlled current source circuit is electrically connected with the first end of the MOS tube Q2, the grid of the MOS tube Q2 is connected with an OAM signal, the second end of the MOS tube Q2 is connected with the input end of the mirror current source circuit, and the output end of the mirror current source circuit is connected with the laser. The scheme realizes the multi-carrier amplitude modulation OAM signal modulation scheme, the modulation depth is accurate and controllable, meanwhile, the influence of the OAM signal on an optical link is further reduced, and the product performance and batch production provide reliable guarantee.
Description
Technical Field
The utility model relates to the technical field of carrier amplitude modulation, in particular to an OAM (operation administration and maintenance) implementation circuit of a multi-carrier amplitude modulation scheme.
Background
With the strong advance of 5G construction, the problem of insufficient optical fiber resources in the forward transmission field is gradually exposed. The technical problem of effectively utilizing the existing optical fiber resources and ensuring the stability and intelligent controllability of an optical fiber channel is solved. Currently, several operators in China propose semi-active equipment schemes to solve the problem. Wherein, China mobile adopts MWDM mode, China telecom adopts LWDM mode. In either way, a low-frequency small-amplitude OAM signal is superposed on a high-speed signal to realize monitoring and management of the optical fiber channel.
Currently, there are two main ways for OAM signal modulation: 1. a single carrier amplitude modulation scheme; 2. a multi-carrier amplitude modulation scheme. For the multi-carrier amplitude modulation scheme, each carrier corresponds to one WDM wavelength, so that the wavelength of a corresponding channel can be known at the receiving end of the device by analyzing the frequencies of different carriers, and the receiving end can analyze OAM signals of multiple wavelengths only by one receiving circuit. And the single carrier amplitude modulation scheme has only one carrier, so that the semi-active equipment segment is provided with an OAM signal receiving circuit for each wavelength.
In contrast, single carrier amplitude modulation scheme techniques are simpler to implement, but the cost of semi-active devices may increase. The multi-carrier can reduce the equipment cost, but the technical difficulty of realizing the multi-carrier on the optical module is higher.
Currently, there are many technical documents about single carrier amplitude modulation, but the technical proposals for multi-carrier amplitude modulation schemes are still relatively rare. With the current solution, there are mainly several problems: 1. the function of multi-carrier amplitude modulation is not realized; 2. by loading the top-adjusting signal on the power supply voltage of the laser, the top-adjusting signal is easily influenced by power supply noise, and the sensitivity of the receiving end of the optical module is reduced; 3. the modulation depth of the OAM signal cannot be quantized and is not easy to control.
Disclosure of Invention
The utility model provides an OAM realization circuit of a multi-carrier amplitude modulation scheme, which solves the technical problem of the realization obstacle of the multi-carrier amplitude modulation function.
The present invention provides an OAM implementation circuit of a multi-carrier amplitude modulation scheme for solving the above technical problems, which includes: the constant current source circuit comprises a voltage-controlled current source circuit for providing constant current, a signal loading circuit for realizing OAM signal loading and a mirror current source circuit, wherein the signal loading circuit comprises a MOS (metal oxide semiconductor) transistor Q2;
the input end of the voltage-controlled current source circuit is connected with a carrier signal, the output end of the voltage-controlled current source circuit is electrically connected with the first end of the MOS tube Q2, the grid of the MOS tube Q2 is connected with an OAM signal, the second end of the MOS tube Q2 is connected with the input end of the mirror current source circuit, and the output end of the mirror current source circuit is connected with the laser.
Optionally, the voltage-controlled current source circuit includes an operational amplifier U1, a current pump Q1, and a measurement resistor R6, an output terminal of the operational amplifier U1 is connected to an input terminal of the current pump Q1 through a resistor R3, and an output terminal of the current pump Q1 is connected in series with the measurement resistor R6 and then supplies power to the signal loading circuit.
Optionally, the voltage-controlled current source circuit further includes a simple filter circuit formed by a resistor R1 and a capacitor C1, the carrier signal is connected to an input terminal of the filter circuit, and an output terminal of the filter circuit is connected to an input terminal of the operational amplifier U1.
Optionally, the signal loading circuit includes a safety capacitor C2, and one end of the safety capacitor C2 is grounded, and the other end of the safety capacitor C2 is electrically connected to the second end of the MOS transistor Q2.
Optionally, the OAM implementation circuit further includes a 3.3V regulator, and the 3.3V regulator is configured to supply power to the voltage-controlled current source circuit and the mirror current source circuit.
Optionally, a light emitting diode LD is connected in series between the 3.3V regulated power supply and the mirror current source circuit.
Optionally, the OAM signal is a square wave with a frequency of 1K.
Has the advantages that: the utility model provides an OAM realization circuit of a multi-carrier amplitude modulation scheme, which comprises: the constant current source circuit comprises a voltage-controlled current source circuit for providing constant current, a signal loading circuit for realizing OAM signal loading and a mirror current source circuit, wherein the signal loading circuit comprises a MOS (metal oxide semiconductor) transistor Q2; the input end of the voltage-controlled current source circuit is connected with a carrier signal, the output end of the voltage-controlled current source circuit is electrically connected with the first end of the MOS tube Q2, the grid of the MOS tube Q2 is connected with an OAM signal, the second end of the MOS tube Q2 is connected with the input end of the mirror current source circuit, and the output end of the mirror current source circuit is connected with the laser. The scheme realizes the multi-carrier amplitude modulation OAM signal modulation scheme, the modulation depth is accurate and controllable, meanwhile, the influence of the OAM signal on an optical link is further reduced, and the product performance and batch production provide reliable guarantee.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
fig. 1 is a schematic diagram of the design of an OAM implementation circuit of the multi-carrier amplitude modulation scheme of the present invention;
fig. 2 is a signal diagram of a modulated signal of an OAM implementation circuit of a multi-carrier amplitude modulation scheme of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model. The utility model is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 and fig. 2, the present invention provides an OAM implementation circuit of a multi-carrier amplitude modulation scheme, which includes: the constant current source circuit comprises a voltage-controlled current source circuit 1 for providing constant current, a signal loading circuit 2 for realizing OAM signal loading and a mirror current source circuit 3, wherein the signal loading circuit 2 comprises a MOS (metal oxide semiconductor) transistor Q2; the input end of the voltage-controlled current source circuit 1 is connected with a carrier signal, the output end of the voltage-controlled current source circuit 1 is electrically connected with the first end of the MOS tube Q2, the grid of the MOS tube Q2 is connected with an OAM signal, the second end of the MOS tube Q2 is connected with the input end of the mirror current source circuit 3, and the output end of the mirror current source circuit 3 is connected with the laser. The voltage-controlled current source circuit 1 receives a carrier signal to provide a constant current for the laser, then inputs the constant current to the signal loading circuit 2, loads an OAM signal, and finally outputs the OAM signal through the mirror current source circuit 3. The scheme realizes the multi-carrier amplitude modulation OAM signal modulation scheme, the modulation depth is accurate and controllable, meanwhile, the influence of the OAM signal on an optical link is further reduced, and the product performance and batch production provide reliable guarantee.
Optionally, the OAM implementation circuit further includes a 3.3V voltage regulator, and the 3.3V voltage regulator is used to supply power to the voltage-controlled current source circuit and the mirror current source circuit. All circuits adopt a uniform 3.3V voltage-stabilizing source for power supply, and the precision of the measurement reference is ensured.
Optionally, the signal loading circuit includes a safety capacitor C2, and one end of the safety capacitor C2 is grounded, and the other end of the safety capacitor C2 is electrically connected to the second end of the MOS transistor Q2. The safety capacitor C2 plays a role in preventing surge current from flowing back, and plays a role in protection.
In one particular implementation scenario:
the voltage controlled current source circuit 1 is used to provide a constant current to the laser, and this linear drive circuit provides a cleaner drive current than a switching PWM circuit. The circuit is characterized in that a current pump Q1 with a current boosting function is connected to an output pin of an operational amplifier U1, and the size of a driving circuit is tested by measuring the voltage drop of a resistor R6. The resistor R1 and the capacitor C1 form a simple filter circuit, and the cutoff frequency f is 1/(2 pi R1 and C1), so that the noise interference is further reduced.
The signal loading circuit 2 is used for realizing the function of loading the OAM signals, and the OAM signals are square waves with a frequency of about 1K according to the existing standard. The square wave signal can be generated by an MCU, and the high and low levels of the square wave can be controlled. The MOS transistor Q2 is a MOS FET, and the OAM signal can be loaded by using its basic switching characteristic. When the OAM signal is 1, a high level is output, the MOS transistor Q2 is turned on, and the current generated by the 1 st part can be loaded on the laser. When the OAM signal is 0, a low level is output, the MOS transistor Q2 is turned off, and the current generated by the voltage-controlled current source circuit 1 is short-circuited and cannot be applied to the laser. The current thus applied to the laser contains both the carrier information and the OAM information. The modulated signal diagram is shown in fig. 2.
Output current I of voltage-controlled current source 1OUTControlled by the voltage input (i.e., the current flowing into the MOS transistor Q2), the input voltage and the carrier voltage V of multiple frequenciesINThe carrier voltage can be output by the MCU or a special analog voltage source. Output currentIOUTSatisfies the following formula:
IOUT＝(R5＊VIN)/(R4＊R6) (1)
after passing through the signal loading circuit 2, the generated OAM current IOAM and the level VOAM of the OAM signal satisfy the following relationship:
IOAM＝(R5＊VIN)/(R4＊R6) (VOAM＝1)
IOAM＝0 (VOAM＝0)
the output current and the input current of the mirror current source 3 are equal. Input current of mirror current source, i.e. current I generated by voltage-controlled current source circuit 1 and signal loading circuit 2OAMThen the final drive current I of the laser and the original bias current I of the laserbiasAnd IOAMSatisfies the following formula:
I＝Ibias+IOAM (3)
the relationship between the output light power P of the laser and the drive current of the laser is as follows:
P＝(I－Ith)＊SE (4)
in the above formula IthFor the threshold current of the laser, SE is the electro-optic conversion efficiency of the laser, where the modulation depth is defined as:
Φ＝(P(1)－P(0))/(P(1)+P(0)) (5)
where P (1) represents the average optical power when the modulation signal is "1", i.e., VOAMAverage optical power at 1; p (0) represents the average optical power when the modulation signal is "0", i.e., V OAM1 is the average optical power.
The modulation depth of OAM can be accurately controlled by formulas 1-5.
The technical scheme of the utility model realizes the OAM signal modulation scheme of multi-carrier amplitude modulation, the modulation depth is accurate and controllable, meanwhile, the influence of the OAM signal on the optical link is further reduced, and the product performance and batch production provide reliable guarantee.
The foregoing is merely a preferred embodiment of the utility model and is not intended to limit the utility model in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the utility model as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (7)
1. An OAM implementation circuit of a multi-carrier amplitude modulation scheme, comprising: the constant current source circuit comprises a voltage-controlled current source circuit for providing constant current, a signal loading circuit for realizing OAM signal loading and a mirror current source circuit, wherein the signal loading circuit comprises a MOS (metal oxide semiconductor) transistor Q2;
the input end of the voltage-controlled current source circuit is connected with a carrier signal, the output end of the voltage-controlled current source circuit is electrically connected with the first end of the MOS tube Q2, the grid of the MOS tube Q2 is connected with an OAM signal, the second end of the MOS tube Q2 is connected with the input end of the mirror current source circuit, and the output end of the mirror current source circuit is connected with the laser.
2. The OAM implementation circuit of claim 1, wherein the voltage-controlled current source circuit comprises an operational amplifier U1, a current pump Q1 and a measuring resistor R6, an output terminal of the operational amplifier U1 is connected with an input terminal of the current pump Q1 through a resistor R3, and an output terminal of the current pump Q1 is connected with the measuring resistor R6 in series to supply power to the signal loading circuit.
3. A OAM implementation circuit of a multi-carrier amplitude modulation scheme as claimed in claim 2, characterized in that said voltage controlled current source circuit further comprises a simple filter circuit consisting of a resistor R1 and a capacitor C1, said carrier signal being connected to an input of said filter circuit, an output of said filter circuit being connected to an input of said op-amp U1.
4. The OAM implementation circuit of a multi-carrier amplitude modulation scheme according to claim 1, wherein the signal loading circuit comprises a safety capacitor C2, one end of the safety capacitor C2 is grounded, and the other end is electrically connected to the second end of the MOS transistor Q2.
5. The OAM implementation circuit of claim 1, further comprising a 3.3V regulated supply, wherein the 3.3V regulated supply is configured to power the voltage controlled current source circuit and a mirror current source circuit.
6. A OAM implementation circuit for a multi-carrier amplitude modulation scheme according to claim 5, wherein a light emitting diode (LD) is connected in series between the 3.3V regulated supply and the mirror current source circuit.
7. A multi-carrier amplitude modulation scheme OAM implementation circuit as recited in claim 1, wherein said OAM signal is a square wave of frequency 1K.
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| CN202122106834.9U CN215581185U (en) | 2021-09-01 | 2021-09-01 | OAM (operation administration and maintenance) implementation circuit of multi-carrier amplitude modulation scheme |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115483982A (en) * | 2022-08-30 | 2022-12-16 | 西北核技术研究所 | Analog optical link input signal measuring method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115483982A (en) * | 2022-08-30 | 2022-12-16 | 西北核技术研究所 | Analog optical link input signal measuring method and device |
| CN115483982B (en) * | 2022-08-30 | 2024-06-21 | 西北核技术研究所 | Analog optical link input signal measuring method and device |
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