An optical module with service management function

Abstract

The present invention discloses an optical module with a service management function, comprising an MCU, an optical receiving component and a signal amplifying unit; wherein the optical receiving component is used for, after receiving an optical signal carrying service management information, converting the optical signal into an analog voltage signal and outputting the signal amplifying unit after AC coupling; the signal amplifying unit is used for amplifying the analog voltage signal; the voltage comparator is used for demodulating a digital signal from the amplified analog voltage signal according to a reference voltage; the communication interface unit is used for decoding the digital signal to obtain the service management information; the present invention can realize the monitoring and management of the network, which not only solves the problems of difficult troubleshooting and maintenance in the prior art, but also has a cost advantage and a higher cost-performance ratio because only one MCU is used to realize Manchester encoding and decoding functions, thereby improving market competitiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of optical communications, and in particular to an optical module with a service management function. Background Art

[0002] In early November 2019, the three major operators announced the official commercial use of 5G. 5G is still in its early stages of development, and its advantages over 4G in terms of disruptive impact on our lives have not yet been realized, but it is no longer far from our smart life. 5G network is the fifth generation of mobile communication network. Its main goal is not only to satisfy the high-speed and high-bandwidth video and voice connection between people, but also to break through and transform to the connection between things. For example, it will support smart homes, unmanned driving, AR / VR technology experience, telemedicine, smart cities, etc., to promote the arrival of the era of the Internet of Everything.

[0003] At present, in the process of 5G network construction, due to the shortage of spectrum resources in the mid- and low-frequency bands, 5G networks have selected higher-frequency spectrum resources. However, the higher the frequency, the greater the loss. Therefore, the base station density of 5G networks will be about 3 to 5 times that of 4G networks.

[0004] With the increase in 5G base station sites and the increase in 5G network node reuse, coupled with the use of passive wavelength division devices, the complexity of the network has increased dramatically, the operation and maintenance of 5G networks and problem location have become more difficult, and background inspection and management are very inconvenient.

[0005] Therefore, in order to solve the problem of on-site application maintenance and improve the efficiency and reliability of network installation and maintenance, it is necessary to provide an optical module with business management capabilities to increase its monitorability, which is of great significance to the operator's network management and maintainability.

[0006] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0007] The present invention provides an optical module with a service management function to solve the deficiencies of the prior art.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] An optical module with service management function, comprising an MCU, an optical receiving component and a signal amplification unit; wherein:

[0010] The MCU includes a voltage comparator and a communication interface unit connected to the voltage comparator; the optical receiving component is connected to the signal amplifying unit, and the signal amplifying unit is connected to the voltage comparator;

[0011] The optical receiving component is used to convert the optical signal carrying the service management information into an analog voltage signal after receiving the optical signal and output it to the signal amplifying unit after AC coupling;

[0012] The signal amplification unit is used to amplify the analog voltage signal;

[0013] The voltage comparator is used to demodulate the digital signal from the amplified analog voltage signal according to the reference voltage;

[0014] The communication interface unit is used to decode the digital signal to obtain the service management information;

[0015] The light receiving component includes a transimpedance amplifier and a photodiode connected to the transimpedance amplifier;

[0016] The signal amplification unit comprises a first operational amplifier;

[0017] The positive input terminal of the first operational amplifier is connected to the output terminal of the transimpedance amplifier through a first capacitor, and the first capacitor and the transimpedance amplifier are grounded through a third resistor;

[0018] The negative input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier through a second resistor and a fifth capacitor connected in parallel;

[0019] The output end of the first operational amplifier is connected to the IN+ pin of the MCU.

[0020] Furthermore, in the optical module with service management function, the optical module also includes a low-pass filter circuit unit;

[0021] The signal amplification unit is also connected to the voltage comparator through the low-pass filter circuit unit;

[0022] The voltage comparator uses the DC bias voltage output by the signal amplifying unit and passes it through the low-pass filtering circuit unit to obtain a DC voltage as the reference voltage.

[0023] Furthermore, in the optical module with service management function, the low-pass filter circuit unit includes a fifth resistor and a second capacitor;

[0024] The IN-pin of the MCU is grounded through the second capacitor, and is connected to the output end of the first operational amplifier through the fifth resistor.

[0025] Furthermore, in the optical module with service management function, the MCU also includes a CLU clock and data recovery unit;

[0026] The OUT pin of the MCU is connected to the CLU pin to connect the CLU clock and data recovery unit to the communication interface unit;

[0027] The voltage comparator is connected to the communication interface unit through the CLU clock and data recovery unit;

[0028] The CLU clock and data recovery unit is used to recover the clock signal and the data signal from the digital signal encoded by the physical layer;

[0029] The communication interface unit decodes the service management information from the digital signal according to the clock signal and the data signal.

[0030] Furthermore, in the optical module with service management function, the optical module also includes a sampling isolation unit;

[0031] The MCU further includes an analog-to-digital converter, and the optical receiving component is connected to the analog-to-digital converter via the sampling isolation unit;

[0032] The MCU is used to sample the signal converted by the analog-to-digital converter to monitor the received optical power of the optical receiving component.

[0033] Further, in the optical module with service management function, the sampling isolation unit includes a second operational amplifier;

[0034] The positive input terminal of the second operational amplifier is connected to the output terminal of the transimpedance amplifier, and the negative input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier;

[0035] The output end of the second operational amplifier is connected to the ADC pin of the MCU.

[0036] Furthermore, in the optical module with service management function, the optical module further includes an optical transmitting component, a driving unit and a switch selection unit, and the MCU further includes an encoding unit and at least two digital-to-analog converters;

[0037] The encoding unit is connected to the switch selection unit, the digital-to-analog converter is connected to the switch selection unit, and the switch selection unit is connected to the light emitting component via the driving unit;

[0038] The encoding unit is used to encode the transmission signal carrying the service management information;

[0039] The digital-to-analog converter is used to set the current of the driving unit;

[0040] The switch selection unit is used to conduct with one of the at least two digital-to-analog converters, so that the driving unit works according to the current of the currently conducted digital-to-analog converter;

[0041] The optical transmission component is used to convert the coded modulated transmission signal into an optical signal and transmit it under the drive of the driving unit.

[0042] Furthermore, in the optical module with service management function, the optical emitting component includes a laser diode;

[0043] The cathode of the laser diode is connected to the OUTK pin of the driving unit, and the anode of the laser diode is connected to the OUTA pin of the driving unit;

[0044] The VCCT pin of the driving unit is connected to the OUTA pin of the driving unit through a filtering isolation device;

[0045] The SDA pin of the driving unit is connected to the SDA pin of the MCU, and the SCL pin of the driving unit is connected to the SCL pin of the MCU;

[0046] The RDIP pin of the driving unit is connected to the transimpedance amplifier through a third capacitor, and the RDIN pin of the driving unit is connected to the transimpedance amplifier through a fourth capacitor;

[0047] The SDA pin of the driving unit is connected to the power supply voltage through a sixth resistor, and the SCL pin of the driving unit is connected to the power supply voltage through a seventh resistor.

[0048] Furthermore, in the optical module with service management function, the NC pin of the switch selection unit is connected to the DAC1 pin of the MCU;

[0049] The NO pin of the switch selection unit is connected to the DAC2 pin of the MCU;

[0050] The IN pin of the switch selection unit is connected to the IO pin of the MCU;

[0051] An EN pin of the switch selection unit is grounded.

[0052] Furthermore, in the optical module with service management function, the optical module also includes a V / I conversion circuit and a reference voltage circuit;

[0053] The V / I conversion circuit includes a fourth operational amplifier;

[0054] The positive input terminal of the fourth operational amplifier is connected between the ninth resistor and the eighth resistor connected in series;

[0055] The other end of the ninth resistor is connected to the COM pin of the switch selection unit, and the other end of the eighth resistor is connected to the cathode of the laser diode;

[0056] The negative input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier through an eleventh resistor;

[0057] The output end of the fourth operational amplifier is connected to the cathode of the laser diode through a tenth resistor;

[0058] The reference voltage circuit includes a third operational amplifier;

[0059] The positive input terminal of the third operational amplifier is connected to the Vref pin of the MCU;

[0060] The negative input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier;

[0061] The output terminal of the third operational amplifier is connected to the ground through the thirteenth resistor and the fourteenth resistor in series; the negative input terminal of the fourth operational amplifier is connected between the thirteenth resistor and the fourteenth resistor through the twelfth resistor;

[0062] The negative input terminal of the third operational amplifier is also grounded via a fifteenth resistor and a sixteenth resistor connected in series;

[0063] The positive input terminal of the first operational amplifier is also connected between the fifteenth resistor and the sixteenth resistor through a first resistor, and the negative input terminal of the first operational amplifier is also connected between the fifteenth resistor and the sixteenth resistor through a fourth resistor.

[0064] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0065] An optical module with a service management function provided in an embodiment of the present invention can realize monitoring and management of the network, which not only solves the problems of difficult troubleshooting and maintenance in the prior art, but also has a more cost-effective and higher cost-performance ratio because only one MCU is used to realize Manchester encoding and decoding functions, thereby improving market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0067] Figure 1 This is a functional module schematic diagram of an optical module with a service management function provided by an embodiment of the present invention;

[0068] Figure 2 This is a schematic diagram of the circuit principle of an optical module with a service management function provided by an embodiment of the present invention;

[0069] Figure 3 It is a schematic diagram of the implementation principle of the top adjustment signal of the optical module provided by an embodiment of the present invention;

[0070] Figure 4 The figure is a modulation principle diagram of a top modulation signal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0071] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0073] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0074] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0075] Embodiment 1

[0076] In view of the defects of the above-mentioned existing optical module technology, the inventor, based on many years of rich practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with the application of principles, actively conducts research and innovation, in order to create a solution that can solve the maintenance and management problems caused by the increase in 5G network node reuse and the use of passive wavelength division devices, so that the produced optical modules are more reliable. After continuous research and design, and after repeated trial samples and improvements, the present invention with real practical value was finally created.

[0077] Please refer to Figures 1 to 4 The embodiment of the present invention provides an optical module with a service management function (i.e., the so-called "top adjustment" technology), including an MCU U3, an optical receiving component and a signal amplifying unit, which constitute the receiving part of the optical module, such as Figure 1 As shown; among them,

[0078] The MCU U3 includes a voltage comparator and a communication interface unit connected to the voltage comparator; the optical receiving component is connected to the signal amplifying unit, and the signal amplifying unit is connected to the voltage comparator;

[0079] The optical receiving component is used to convert the optical signal carrying the service management information into an analog voltage signal after receiving the optical signal and output it to the signal amplifying unit after AC coupling;

[0080] The signal amplification unit is used to amplify the analog voltage signal;

[0081] The voltage comparator is used to demodulate the digital signal from the amplified analog voltage signal according to the reference voltage;

[0082] The communication interface unit is used to decode the digital signal to obtain the service management information;

[0083] The optical receiving component includes a transimpedance amplifier TIA and a photodiode connected to the transimpedance amplifier TIA;

[0084] The signal amplification unit includes a first operational amplifier U2;

[0085] The positive input terminal of the first operational amplifier U2 is connected to the output terminal of the transimpedance amplifier TIA through the first capacitor C1, and the first capacitor C1 and the transimpedance amplifier TIA are grounded through the third resistor R3;

[0086] The negative input terminal of the first operational amplifier U2 is connected to the output terminal of the first operational amplifier U2 through the second resistor R2 and the fifth capacitor C5 connected in parallel;

[0087] The output end of the first operational amplifier U2 is connected to the IN+ pin of the MCU U3.

[0088] Wherein, the communication interface unit may be a SPI interface (Serial Peripheral Interface, serial peripheral interface), Figure 1 The SPI interface is shown in the figure.

[0089] It should be noted that the optical module in this embodiment realizes the function of receiving and processing low-frequency amplitude modulation service management information, and can receive remote query and configuration information.

[0090] In this embodiment, since the demodulated digital signal needs to meet certain requirements of the DC bias range, the voltage comparator needs to complete the demodulation according to the reference voltage, and the optical module may further include a low-pass filter circuit unit;

[0091] The signal amplification unit is also connected to the voltage comparator through the low-pass filter circuit unit;

[0092] The voltage comparator uses the DC bias voltage output by the signal amplification unit and passes it through the low-pass filter circuit unit to obtain a DC voltage as the reference voltage, which can obtain a better dynamic response speed and also reduce the duty cycle distortion problem of the signal.

[0093] like Figure 2 As shown, preferably, the low-pass filter circuit unit includes a fifth resistor R5 and a second capacitor C2;

[0094] The IN-pin of the MCU U3 is grounded through the second capacitor C2 and connected to the output end of the first operational amplifier U2 through the fifth resistor R5.

[0095] Of course, the reference voltage mentioned above may also be obtained from the outside, such as from an external independent circuit unit, which is not limited in this embodiment.

[0096] In this embodiment, when the communication interface unit adopts the SPI interface, since the digital signal obtained by demodulation by the voltage comparator still has a certain duty cycle distortion, in order to further reduce the duty cycle distortion problem of the signal, the MCU U3 may also include a CLU clock and data recovery unit. Figure 1 Indicated by CLU;

[0097] The OUT pin of the MCU U3 is connected to the CLU pin to connect the CLU clock and data recovery unit to the communication interface unit;

[0098] The voltage comparator is connected to the communication interface unit through the CLU clock and data recovery unit;

[0099] The CLU clock and data recovery unit is used to recover the clock signal and the data signal from the digital signal encoded by the physical layer;

[0100] The communication interface unit decodes the service management information from the digital signal according to the clock signal and the data signal, which can effectively reduce the duty cycle distortion problem and improve the signal quality.

[0101] In this embodiment, the optical module may further include a sampling isolation unit;

[0102] The MCU U3 also includes an analog-to-digital converter (ADC). Figure 1 ADC is shown in the figure, and the light receiving component is connected to the analog-to-digital converter through the sampling isolation unit;

[0103] The MCU U3 is used to sample the signal converted by the analog-to-digital converter to monitor the received optical power of the optical receiving component.

[0104] Since the noise inside the MCU U3 can easily interfere with the input signal of the signal amplifying unit during the signal sampling process, resulting in reduced sensitivity of the signal amplifying unit and decreased signal quality, the embodiment of the present invention adds a sampling isolation unit while sampling to implement received optical power monitoring, so as to prevent the internal noise of the MCU U3 from interfering with the low-frequency weak signal carried in the input signal of the signal amplifying unit.

[0105] like Figure 2 As shown, preferably, the sampling isolation unit includes a second operational amplifier U1;

[0106] The positive input terminal of the second operational amplifier U1 is connected to the output terminal of the transimpedance amplifier TIA, and the negative input terminal of the second operational amplifier U1 is connected to the output terminal of the second operational amplifier U1;

[0107] The output end of the second operational amplifier U1 is connected to the ADC pin of the MCU U3.

[0108] like Figure 1 As shown, the optical module further includes an optical transmitting component, a driving unit U4 and a switch selection unit, and the MCU U3 further includes an encoding unit and at least two digital-to-analog converters (DACs). Figure 1 As shown in DAC, these parts constitute the transmitting part of the optical module;

[0109] The encoding unit is connected to the switch selection unit, the digital-to-analog converter is connected to the switch selection unit, and the switch selection unit is connected to the light emitting component through the driving unit U4;

[0110] The encoding unit is used to encode the transmission signal carrying the service management information;

[0111] The digital-to-analog converter is used to set the current of the driving unit U4;

[0112] The switch selection unit is used to conduct with one of the at least two digital-to-analog converters, so that the driving unit U4 works according to the current of the currently conducted digital-to-analog converter;

[0113] The optical transmission component is used to convert the coded modulated transmission signal into an optical signal and transmit it under the drive of the driving unit U4.

[0114] It should be noted that by selecting multiple digital-to-analog converters to set the drive current through a switch mode, supporting the drive current Sink or Source mode, it is possible to effectively avoid the optical power instability factors and deviation effects that may exist during the dynamic adjustment of the DAC.

[0115] like Figure 2 As shown, preferably, the light emitting component includes a laser diode LD;

[0116] The cathode of the laser diode LD is connected to the OUTK pin of the driving unit U4, and the anode of the laser diode LD is connected to the OUTA pin of the driving unit;

[0117] The VCCT pin of the driving unit U4 is connected to the OUTA pin of the driving unit through a filtering isolation device (such as a ferrite bead FB1);

[0118] The SDA pin of the driving unit U4 is connected to the SDA pin of the MCU U3, and the SCL pin of the driving unit U4 is connected to the SCL pin of the MCU U3;

[0119] The RDIP pin of the driving unit U4 is connected to the transimpedance amplifier TIA through the third capacitor C3, and the RDIN pin of the driving unit U4 is connected to the transimpedance amplifier TIA through the fourth capacitor C4, which is a high-speed data receiving and transmission path;

[0120] The SDA pin of the driving unit U4 is connected to the power supply voltage through the sixth resistor R6, and the SCL pin of the driving unit is connected to the power supply voltage through the seventh resistor R7.

[0121] like Figure 2 As shown, preferably, the NC pin of the switch selection unit U5 is connected to the DAC1 pin of the MCU U3;

[0122] The NO pin of the switch selection unit U5 is connected to the DAC2 pin of the MCU U3;

[0123] The IN pin of the switch selection unit U5 is connected to the IO pin of the MCU U3;

[0124] The EN pin of the switch selection unit U5 is grounded.

[0125] like Figure 2 As shown, preferably, the optical module also includes a V / I conversion circuit and a reference voltage circuit;

[0126] The V / I conversion circuit includes a fourth operational amplifier U6;

[0127] The positive input terminal of the fourth operational amplifier U6 is connected between the ninth resistor R9 and the eighth resistor R8 connected in series;

[0128] The other end of the ninth resistor R9 is connected to the COM pin of the switch selection unit U5, and the other end of the eighth resistor R8 is connected to the cathode of the laser diode LD;

[0129] The negative input terminal of the fourth operational amplifier U6 is connected to the output terminal of the fourth operational amplifier U6 through the eleventh resistor R11; the output terminal of the fourth operational amplifier U6 is connected to the cathode of the laser diode LD through the tenth resistor R10;

[0130] The reference voltage circuit includes a third operational amplifier U7;

[0131] The positive input terminal of the third operational amplifier U7 is connected to the Vref pin of the MCU U3; the negative input terminal of the third operational amplifier U7 is connected to the output terminal of the third operational amplifier; the output terminal of the third operational amplifier U7 is grounded through the thirteenth resistor R13 and the fourteenth resistor R14 connected in series; the negative input terminal of the fourth operational amplifier U6 is connected between the thirteenth resistor R13 and the fourteenth resistor R14 through the twelfth resistor R12; the negative input terminal of the third operational amplifier U7 is also grounded through the fifteenth resistor R15 and the sixteenth resistor R16 connected in series;

[0132] The positive input terminal of the first operational amplifier U2 is also connected between the fifteenth resistor R15 and the sixteenth resistor R16 through the first resistor R1, and the negative input terminal of the first operational amplifier U2 is also connected between the fifteenth resistor R15 and the sixteenth resistor R16 through the fourth resistor R4.

[0133] The circuit function design of the transmitting part is realized:

[0134] The Manchester encoding is used for the encoding of the transmitted OAM low-frequency drive amplitude modulation signal. The low-high level jump represents 0, and the high-low level jump represents 1. The transmitted signal is encoded by the encoding unit of MCU U3 and output to the IN pin of the switch selection unit through the IO pin. Different DAC outputs are selected according to the high and low levels. When the IN pin is high, the voltage input to the NC pin of DAC1 is output from the COM pin; when the IN pin is low, the voltage input to the NO pin of DAC2 is output from the COM pin.

[0135] The reference voltage is V ref After the voltage follower, the resistor divider gives:

[0136]

[0137] Working principle of V / I conversion circuit:

[0138] Assume R 10 The voltage at the left end is V1, the voltage at the right end is V2, and the positive input terminal of the fourth operational amplifier U6 is V P , the inverting input terminal is V N ;

[0139] The input resistance of the op amp is infinite. According to the linear resistor network and the superposition law, we get:

[0140]

[0141]

[0142] Since the V / I conversion circuit introduces voltage series negative feedback, the virtual short V P =V N condition,

[0143]

[0144] When R8 / R9=R 11 / R 12 = k condition, we get:

[0145]

[0146] The magnitude of the top adjustment signal driving current is:

[0147]

[0148] The 2-way DAC output of MCU U3 is selected by the switch selection unit U5 and outputs V DAC Voltage. When V DAC >V aWhen V1>V2, the V / I conversion circuit current Source outputs, and the optical power amplitude decreases;

[0149] When V DAC <V a When V1 is less than V2, the V / I conversion circuit current Sink outputs, and the optical power amplitude increases; MCU U3 uses DAC to set the V / I conversion drive current I mod The size of the LD output optical power amplitude is changed to achieve the 3% to 5% low-frequency optical power amplitude modulation function.

[0150] The circuit function design and implementation of the receiving part:

[0151] When the optical receiving assembly (ROSA) receives the optical signal, it generates a response current RSSI, which is converted into a voltage signal through R3. One of the paths is isolated by the second operational amplifier U1 and input to the ADC pin of MCU U3 for sampling as a monitoring of the received optical power. The other path is coupled by the first capacitor C1 and input to the signal amplification unit composed of the first operational amplifier U2. After amplifying the low-frequency amplitude signal, it is input to the comparator IN+ pin of MCU U3, and the reference voltage of the comparator IN- pin is the DC voltage obtained by low-pass filtering the output signal of the first operational amplifier U2 of the signal amplification unit through R5 and C2. The internal comparator of MCU U3 is used to convert the analog signal into a digital signal and output it from the OUT pin, and then input it into the configurable CLU clock and data recovery unit inside MCU U3 for clock and data recovery, and finally the low-frequency amplitude modulation signal is restored through internal SPI communication decoding.

[0152] The reference voltage is V ref After passing through the third operational amplifier U7, the resistor voltage is divided to obtain:

[0153]

[0154] Working principle of the signal amplification unit in the receiving part:

[0155] The characteristics of the in-phase proportional amplifier circuit are as follows:

[0156] When there is no AC signal input:

[0157] The negative feedback circuit formed by the first operational amplifier U2 satisfies V + =V - =V b , then the voltage across R4 is V b , its DC input current is zero, and the output voltage V O =V - +R2*0=Vb , the output DC bias voltage of the first operational amplifier U2 is V b .

[0158] When there is an AC signal On input:

[0159]

[0160] make So, the output voltage in the frequency domain can be simplified to:

[0161]

[0162] Select appropriate resistance and capacitance values ​​of R1, C1, R2, and C5. When the operating frequency is f L <<f<<f H In the range, the output is

[0163] The optical module with service management function provided by the embodiment of the present invention only uses one MCU to realize Manchester encoding and decoding functions. In Manchester decoding, the CLU resources of the MCU are used, and the solution cost is more advantageous and the cost performance is higher.

[0164] The drive modulation circuit supports Sink and Source current modes. The average current flowing through the LD before and after modulation is constant, so the output average optical power can be kept constant. In addition, the indirect modulation method is realized by hardware switching, which makes the drive circuit more stable and has shorter delay.

[0165] In terms of design optimization in reception and demodulation, the present invention designs a low-noise, high-amplification signal amplification unit. The amplified signal is converted into a digital signal through the MCU voltage comparator, and then the clock and data signals are restored through the internal CLU, which reduces the difficulty of software processing and improves product reliability. The high-magnification and wide DC range amplifier circuit with bias also considers the influence of MCU noise, and performs circuit isolation to reduce the noise caused by sampling and improve the sensitivity of reception.

[0166] Thus far, the description of the above-described embodiments is provided for the purpose of illustration and description. It is not intended to be exhaustive or to limit the present disclosure. The individual elements or features of a specific embodiment are generally not subject to the limitations of the specific embodiment, but when applicable, they can be interchanged and used for selected embodiments even if not specifically shown or described. In many respects, the same element or feature also can be changed. This variation is not considered to be a departure from the present disclosure, and all such modifications are intended to be included in the scope of the present disclosure.

[0167] Example embodiments are provided so that the present disclosure will be thorough and the scope will be fully conveyed to those skilled in the art. In order to thoroughly understand the embodiments of the present disclosure, numerous details are set forth, such as examples of specific parts, devices, and methods. Obviously, for those skilled in the art, it is not necessary to use specific details, the example embodiments can be implemented in many different forms, and neither should be construed as limiting the scope of the present disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0168] Here, specialized vocabulary is used only for the purpose of describing specific example embodiments, and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a" and "the" used herein may be intended to include plural forms as well. The terms "including" and "having" are inclusive, and therefore specify the presence of the claimed features, wholes, steps, operations, elements and / or components, but do not exclude the presence or additional presence of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. Unless the order of execution is clearly indicated, the method steps, processing and operations described herein are not interpreted as necessarily needing to be performed in the specific order discussed and shown. It should also be understood that additional or optional steps may be adopted.

[0169] When an element or layer is referred to as being "on ...", "engaged with ...", "connected to" or "coupled to" another element or layer, it may be directly on another element or layer, engaged with another element or layer, connected to or coupled to another element or layer, or there may be an intervening element or layer. In contrast, when an element or layer is referred to as being "directly on ...", "directly engaged with ...", "directly connected to" or "directly coupled to" another element or layer, there may be no intervening element or layer. Other words used to describe element relationships should be interpreted in a similar manner (e.g., "between ..." and "directly between ...", "adjacent" and "directly adjacent", etc.). The term "and / or" used herein includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts are not limited by these terms. These terms may only be used to distinguish one element, component, region or part from another element, component, region or part. Unless clearly indicated by the context, the use of terms such as "first", "second" and other numerical terms herein does not imply sequence or order. Therefore, the first element, component, region, layer or part discussed below can adopt the terminology of the second element, component, region, layer or part without departing from the teaching of the exemplary embodiment.

[0170] Spatially relative terms, such as "inside", "outside", "below", "below...", "lower", "above", "upper", etc., may be used herein for ease of description to describe the relationship between one element or feature and one or more other elements or features as shown in the figure. Spatially relative terms may be meant to include different orientations of the device in addition to the orientation depicted in the figure. For example, if the device in the figure is flipped, the elements described as "below other elements or features" or "below elements or features" will be oriented as "above other elements or features". Therefore, the example term "below..." may include both upward and downward orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations) and interpreted with the spatially relative descriptions herein.

Claims

1. An optical module with service management function, characterized in that: It includes MCU, optical receiving component and signal amplification unit; wherein, The MCU includes a voltage comparator and a communication interface unit connected to the voltage comparator; the optical receiving component is connected to the signal amplifying unit, and the signal amplifying unit is connected to the voltage comparator; The optical receiving component is used to convert the optical signal carrying the service management information into an analog voltage signal after receiving the optical signal and output it to the signal amplifying unit after AC coupling; The signal amplification unit is used to amplify the analog voltage signal; The voltage comparator is used to demodulate the digital signal from the amplified analog voltage signal according to the reference voltage; The communication interface unit is used to decode the digital signal to obtain the service management information; The light receiving component includes a transimpedance amplifier and a photodiode connected to the transimpedance amplifier; The signal amplification unit comprises a first operational amplifier; The positive input terminal of the first operational amplifier is connected to the output terminal of the transimpedance amplifier through a first capacitor, and the first capacitor and the transimpedance amplifier are grounded through a third resistor; The negative input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier through a second resistor and a fifth capacitor connected in parallel; The output end of the first operational amplifier is connected to the IN+ pin of the MCU; The optical module also includes a low-pass filter circuit unit; The signal amplification unit is also connected to the voltage comparator through the low-pass filter circuit unit; The voltage comparator uses the DC bias voltage output by the signal amplification unit and passes it through the low-pass filter circuit unit to obtain a DC voltage as the reference voltage; The optical module further includes an optical transmitting component, a driving unit and a switch selection unit, and the MCU further includes an encoding unit and at least two digital-to-analog converters; The encoding unit is connected to the switch selection unit, the digital-to-analog converter is connected to the switch selection unit, and the switch selection unit is connected to the light emitting component via the driving unit; The encoding unit is used to encode the transmission signal carrying the service management information; The digital-to-analog converter is used to set the current of the driving unit; The switch selection unit is used to conduct with one of the at least two digital-to-analog converters, so that the driving unit works according to the current of the currently conducted digital-to-analog converter; The optical transmission component is used to convert the coded and modulated transmission signal into an optical signal and transmit it under the drive of the driving unit.

2. The optical module with service management function according to claim 1, characterized in that: The low-pass filter circuit unit includes a fifth resistor and a second capacitor; The IN-pin of the MCU is grounded through the second capacitor, and is connected to the output end of the first operational amplifier through the fifth resistor.

3. The optical module with service management function according to claim 1, characterized in that: The MCU also includes a CLU clock and data recovery unit; The OUT pin of the MCU is connected to the CLU pin to connect the CLU clock and data recovery unit to the communication interface unit; The voltage comparator is connected to the communication interface unit through the CLU clock and data recovery unit; The CLU clock and data recovery unit is used to recover the clock signal and the data signal from the digital signal encoded by the physical layer; The communication interface unit decodes the service management information from the digital signal according to the clock signal and the data signal.

4. The optical module with service management function according to claim 1, characterized in that: The optical module also includes a sampling isolation unit; The MCU further includes an analog-to-digital converter, and the optical receiving component is connected to the analog-to-digital converter via the sampling isolation unit; The MCU is used to sample the signal converted by the analog-to-digital converter to monitor the received optical power of the optical receiving component.

5. The optical module with service management function according to claim 4, characterized in that: The sampling isolation unit includes a second operational amplifier; The positive input terminal of the second operational amplifier is connected to the output terminal of the transimpedance amplifier, and the negative input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier; The output end of the second operational amplifier is connected to the ADC pin of the MCU.

6. The optical module with service management function according to claim 1, characterized in that: The light emitting assembly includes a laser diode; The cathode of the laser diode is connected to the OUTK pin of the driving unit, and the anode of the laser diode is connected to the OUTA pin of the driving unit; The VCCT pin of the driving unit is connected to the OUTA pin of the driving unit through a filtering isolation device; The SDA pin of the driving unit is connected to the SDA pin of the MCU, and the SCL pin of the driving unit is connected to the SCL pin of the MCU; The RDIP pin of the driving unit is connected to the transimpedance amplifier through a third capacitor, and the RDIN pin of the driving unit is connected to the transimpedance amplifier through a fourth capacitor; The SDA pin of the driving unit is connected to the power supply voltage through a sixth resistor, and the SCL pin of the driving unit is connected to the power supply voltage through a seventh resistor.

7. The optical module with service management function according to claim 6, characterized in that: The NC pin of the switch selection unit is connected to the DAC1 pin of the MCU; The NO pin of the switch selection unit is connected to the DAC2 pin of the MCU; The IN pin of the switch selection unit is connected to the IO pin of the MCU; An EN pin of the switch selection unit is grounded.

8. The optical module with service management function according to claim 7, characterized in that: The optical module also includes a V / I conversion circuit and a reference voltage circuit; The V / I conversion circuit includes a fourth operational amplifier; The positive input terminal of the fourth operational amplifier is connected between the ninth resistor and the eighth resistor connected in series; The other end of the ninth resistor is connected to the COM pin of the switch selection unit, and the other end of the eighth resistor is connected to the cathode of the laser diode; The negative input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier through an eleventh resistor; The output end of the fourth operational amplifier is connected to the cathode of the laser diode through a tenth resistor; The reference voltage circuit includes a third operational amplifier; The positive input terminal of the third operational amplifier is connected to the Vref pin of the MCU; The negative input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier; The output end of the third operational amplifier is connected to the ground through the thirteenth resistor and the fourteenth resistor in series; the negative input end of the fourth operational amplifier is connected between the thirteenth resistor and the fourteenth resistor through the twelfth resistor; The negative input terminal of the third operational amplifier is also grounded via a fifteenth resistor and a sixteenth resistor connected in series; The positive input terminal of the first operational amplifier is also connected between the fifteenth resistor and the sixteenth resistor through a first resistor, and the negative input terminal of the first operational amplifier is also connected between the fifteenth resistor and the sixteenth resistor through a fourth resistor.

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