CN113824505A - Optical module - Google Patents
Optical module Download PDFInfo
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- CN113824505A CN113824505A CN202010568955.2A CN202010568955A CN113824505A CN 113824505 A CN113824505 A CN 113824505A CN 202010568955 A CN202010568955 A CN 202010568955A CN 113824505 A CN113824505 A CN 113824505A
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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
- H04B10/40—Transceivers
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/695—Arrangements for optimizing the decision element in the receiver, e.g. by using automatic threshold control
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Abstract
The application provides an optical module, which comprises a judgment circuit. The judgment circuit comprises a first resistor, an operational amplifier and a voltage division circuit. The input end of the first resistor is connected with the light receiving component. And the first input end of the operational amplifier receives a first voltage, the second input end of the operational amplifier receives a second voltage, and the operational amplifier is used for judging and obtaining a first RX-LOS signal according to the first voltage and the second voltage. Two ends of the voltage division circuit are respectively connected with the first input end and the output end of the operational amplifier. When the first voltage is greater than the second voltage, the first RX-LOS signal is high. When the first voltage is less than the second voltage, the first RX-LOS signal is low. In the application, the judgment circuit is used for judging the RX-LOS signal, and the first RX-LOS signal is judged and output by directly utilizing the first voltage of the operational amplifier and the second voltage of the operational amplifier, so that the waiting time in a software algorithm is avoided, and the problem of instable RX-LOS time delay is effectively solved.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to an optical module.
Background
In an optical module product, an RX-LOS (Receive LOSs of Signal Alarm) pin is usually designed. And in the using process, whether the receiving signal of the optical module is lost or not is judged by monitoring the RX-LOS state. With the rapid increase of the social bandwidth demand, the optical module starts to realize rate conversion and signal amplification by means of the DSP. And the DSP does not have an RX-LOS function, and cannot meet the functional requirements of the optical module.
In order to solve the problem, a software algorithm is arranged in the MCU of the traditional optical module, and the software algorithm in the MCU is utilized to realize the RX-LOS function. The specific process is as follows: firstly, inputting an optical signal into a light receiving submodule to generate a photo-generated current; secondly, generating a mirror image by the photo-generated current through a mirror image circuit; thirdly, ADC sampling is carried out on the photo-generated current through the MCU to obtain a sampling value; then, comparing the sampling value with an RX-LOS threshold preset by the MCU, wherein when the sampling value is greater than the RX-LOS threshold, the RX-LOS signal is at a low level, and when the sampling value is less than the RX-LOS threshold, the RX-LOS signal is at a high level; and finally, outputting an RX-LOS signal by a GPIO pin of the MCU.
The MCU not only needs to carry out ADC sampling on the photo-generated current, but also needs to obtain an RX-LOS signal by comparing and judging the size of a sampling value and an RX-LOS threshold value, so that the time delay from the intensity change of an input optical signal to the output of the RX-LOS signal is easy to cause great fluctuation.
Disclosure of Invention
The application provides an optical module, which solves the problem that the time delay from the intensity change of an input optical signal to the output of an RX-LOS signal has great fluctuation.
A light module, comprising:
a circuit board;
the light receiving assembly is electrically connected with the circuit board and used for generating photo-generated current;
the MCU is arranged on the circuit board and used for setting an RX-LOS threshold value;
the judging circuit is arranged on the circuit board, a first input end is electrically connected with the light receiving component, a second input end is electrically connected with the MCU and used for judging to obtain a first RX-LOS signal according to a first input voltage of the first input end and a second input voltage of the second input end, and the first RX-LOS signal is output through a first output end, wherein the first input voltage is a voltage obtained by inputting a photoproduction current into the first input end of the judging circuit, and the second input voltage is a voltage obtained by inputting an RX-LOS threshold value into the second input end of the judging circuit;
the judgment circuit includes:
the input end of the first resistor is electrically connected with the light receiving component;
the first input end of the operational amplifier receives a first voltage obtained by inputting a photoproduction current to the first input end of the operational amplifier through a first resistor, the second input end of the operational amplifier receives a second voltage obtained by inputting an RX-LOS threshold value to the second input end of the operational amplifier, and the operational amplifier is used for judging and obtaining a first RX-LOS signal according to the first voltage and the second voltage;
and the input end of the voltage division circuit is electrically connected with the output end of the operational amplifier, and the output end of the voltage division circuit is electrically connected with the first input end of the operational amplifier.
Has the advantages that: the application provides an optical module, including the circuit board, with the light receiving assembly of circuit board electricity connection, set up MCU and the judgement circuit on the circuit board. The light receiving assembly is used for generating photo-generated current. The MCU is used for setting an RX-LOS threshold value. And the judging circuit is electrically connected with the first input end and the second input end, is electrically connected with the MCU, and is used for judging to obtain a first RX-LOS signal according to a first input voltage of the first input end and a second input voltage of the second input end and outputting the first RX-LOS signal through the first output end, wherein the first input voltage is a voltage obtained by inputting photoproduction current into the first input end, and the second input voltage is a voltage obtained by inputting an RX-LOS threshold value into the second input end. The judgment circuit comprises a first resistor, an operational amplifier and a voltage division circuit. The input end of the first resistor is electrically connected with the light receiving component. And the first input end of the operational amplifier receives a first voltage obtained by inputting the photoproduction current to the first input end of the operational amplifier through the first resistor, the second input end of the operational amplifier receives a second voltage obtained by inputting the RX-LOS threshold value to the second input end of the operational amplifier, and the operational amplifier is used for judging and obtaining a first RX-LOS signal according to the first voltage and the second voltage. And the input end of the voltage division circuit is electrically connected with the output end of the operational amplifier, and the output end of the voltage division circuit is electrically connected with the first input end of the operational amplifier. When the first voltage at the first input terminal of the operational amplifier is greater than the second voltage at the second input terminal of the operational amplifier, the first RX-LOS signal output by the output terminal of the operational amplifier is at a high level. When the first voltage at the first input terminal of the operational amplifier is lower than the second voltage at the second input terminal of the operational amplifier, the first RX-LOS signal output by the output terminal of the operational amplifier is at a low level. In the application, the judgment circuit is used for judging the RX-LOS signal, and the first RX-LOS signal is judged and output by directly utilizing the first voltage of the first input end of the operational amplifier and the second voltage of the second input end of the operational amplifier, so that the waiting time in a software algorithm is avoided, and the problem of instable RX-LOS time delay is effectively solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a connection relationship of an optical communication terminal;
FIG. 2 is a schematic diagram of an optical network unit;
fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure;
FIG. 4 is an exploded view of an optical module according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram provided by an embodiment of the present application;
FIG. 6 is a block diagram of a circuit board according to an embodiment of the present disclosure;
fig. 7 is a circuit diagram of a determining circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer, it is necessary to perform interconversion between the electric signal and the optical signal.
The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.
Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;
one end of the optical fiber 101 is connected with a far-end server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the far-end server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.
An optical port of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; an electrical port of the optical module 200 is externally connected to the optical network terminal 100, and establishes bidirectional electrical signal connection with the optical network terminal 100; the optical module realizes the interconversion of optical signals and electric signals, thereby realizing the establishment of information connection between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber.
The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104, which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 is connected to the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module.
At this point, a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.
Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network terminal is an upper computer of the optical module, provides data signals for the optical module, and receives the data signals from the optical module, and the common upper computer of the optical module also comprises an optical line terminal and the like.
Fig. 2 is a schematic diagram of an optical network terminal structure. As shown in fig. 2, the optical network terminal 100 has a circuit board 105, and a cage 106 is disposed on a surface of the circuit board 105; an electric connector is arranged in the cage 106 and used for connecting an electric port of an optical module such as a golden finger; the cage 106 is provided with a heat sink 107, and the heat sink 107 has a projection such as a fin that increases a heat radiation area.
The optical module 200 is inserted into the optical network terminal, specifically, the electrical port of the optical module is inserted into the electrical connector inside the cage 106, and the optical port of the optical module is connected to the optical fiber 101.
The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged in the cage; the optical module is inserted into the cage, held by the cage, and the heat generated by the optical module is conducted to the cage 106 and then diffused by the heat sink 107 on the cage.
Fig. 3 is a schematic structural diagram of an optical module 200 according to an embodiment of the present disclosure, and fig. 4 is an exploded structural diagram of the optical module 200 according to the embodiment of the present disclosure. Fig. 5 is a schematic diagram provided in an embodiment of the present application. Fig. 6 is a structural diagram of a circuit board according to an embodiment of the present application. As shown in fig. 3 to 6, an optical module 200 provided in an embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking handle 203, a circuit board 204, a light emitting module 205, a light receiving module 206, and a determination circuit 207.
The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned at two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a cover plate, and the cover plate covers two side plates of the upper shell to form a wrapping cavity; the upper shell can also comprise two side walls which are positioned at two sides of the cover plate and are perpendicular to the cover plate, and the two side walls are combined with the two side plates to realize that the upper shell covers the lower shell.
The two openings may be two openings located at the same end of the optical module, or two openings located at different ends of the optical module; one opening is an electric port, and a gold finger of the circuit board extends out of the electric port and is inserted into an upper computer such as an optical network unit; the other opening is an optical port for external optical fiber access to connect the optical transmitting assembly 205 and the optical receiving assembly 206 inside the optical module; optoelectronic devices such as circuit board 204, light emitting assembly 205 and light receiving assembly 206 are located in the package cavity.
The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 204, the light emitting assembly 205, the light receiving assembly 206 and other devices can be conveniently installed in the shell, and the outermost packaging protection shell of the optical module is formed by the upper shell and the lower shell; the upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; generally, the shell of the optical module cannot be made into an integrated structure, so that when devices such as a circuit board and the like are assembled, the positioning component, the heat dissipation structure and the electromagnetic shielding structure cannot be installed, and the production automation is not facilitated.
The unlocking handle 203 is located on the outer wall of the wrapping cavity/lower shell 202 and used for realizing the fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.
The unlocking handle 203 is provided with a clamping structure matched with the upper computer cage; the tail end of the unlocking handle is pulled to enable the unlocking handle to move relatively on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer through a clamping structure of the unlocking handle; by pulling the unlocking handle, the clamping structure of the unlocking handle moves along with the unlocking handle, so that the connection relation between the clamping structure and the upper computer is changed, the clamping relation between the optical module and the upper computer is relieved, and the optical module can be drawn out from the cage of the upper computer.
The circuit board 204 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes and MOS transistors) and chips (such as a microprocessor MCU208, a transimpedance amplifier chip TIA, a laser driver chip, a limiting amplifier, a clock data recovery CDR, a power management chip, and a data processing chip DSP 209). The MCU208 is used for setting an RX-LOS threshold value, and the DSP209 is used for digital signal processing.
The circuit board 204 connects the electrical devices in the optical module together according to circuit design through circuit wiring to realize electrical functions such as power supply, electrical signal transmission, grounding and the like.
The circuit board 204 is generally a rigid circuit board, which can also realize a bearing effect due to its relatively hard material, for example, the rigid circuit board can stably bear a chip; the rigid circuit board may also provide a smooth load bearing when the light emitting assembly 205 and the light receiving assembly 206 are located on the circuit board; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, a metal pin/golden finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.
A flexible circuit board is also used in a part of the optical module to supplement a rigid circuit board; the flexible circuit board is generally used in combination with a rigid circuit board, for example, the rigid circuit board may be connected to the optical transceiver device through the flexible circuit board.
And the light emitting component 205 and the light receiving component 206 are electrically connected with the circuit board 204 and are respectively used for realizing the emission of optical signals and the reception of the optical signals. The light emitting element 205 and the light receiving element 206 may be combined together to form an integrated light transmitting and receiving structure.
The light receiving component 206 enables the reception of light signals and generates photo-generated current. Since the photo-generated current is not only needed to determine the output RX-LOS signal, but also to provide current to the TIA (located in the optical receive module) and DSP209 for processing. Therefore, the photo-generated current generated by the light receiving component 206 needs to be divided into two paths of photo-generated current through the mirror circuit, one path of photo-generated current flows to the TIA and the DSP209, and the other path of photo-generated current flows to the determining circuit 207.
And a mirror circuit disposed in the light receiving element 206. When the mirror circuit is disposed in the light receiving element 206, the light receiving element 206 outputs a path of photo-generated current, and the path of photo-generated current flows to the determining circuit 207. Wherein the other photo-generated current is transmitted to the TIA and the DSP209 within the photo-receiving component 206.
The judgment circuit 207 is disposed on the circuit board 203, and has a first input end electrically connected to the light receiving element 206 and a second input end electrically connected to the MCU208, and is configured to judge to obtain a first RX-LOS signal according to a first input voltage at the first input end and a second input voltage at the second input end, and output the first RX-LOS signal through the first output end. The first input voltage is obtained by inputting the photoproduction current into the first input end of the judging circuit, and the second input voltage is obtained by inputting the RX-LOS threshold value into the second input end of the judging circuit. When the first input voltage at the first input terminal of the judgment circuit 207 is greater than K1, the first RX-LOS signal is output to a high level through the first output terminal of the judgment circuit 207. When the first input voltage at the first input terminal of the judgment circuit 207 is less than K2, the first RX-LOS signal is output to a low level through the first output terminal of the judgment circuit 207, wherein K1/K2 is related to the second input voltage at the second input terminal.
According to the present invention, the first RX-LOS signal is obtained by determining the first input voltage at the first input terminal and the second input voltage at the second input terminal of the determining circuit 207, and the photo-generated current passes through the mirror circuit to obtain two paths of photo-generated currents, wherein one path of photo-generated current is input to the first input terminal of the determining circuit 207. In order to input the first input voltage to the first input terminal of the determination circuit 207, a conversion circuit for converting the photo-generated current into the first input voltage is provided between the mirror circuit and the determination circuit 207. The conversion circuit may be provided as a resistance of a certain value.
Fig. 7 is a circuit diagram of a determining circuit according to an embodiment of the present application. As shown in fig. 6 to 7, in the embodiment of the present application, the determining circuit 207 includes a first resistor 2071, an operational amplifier 2072 and a voltage divider circuit 2073. In particular, the method comprises the following steps of,
the first resistor 2071 has an input end electrically connected to the light receiving element 206.
And an operational amplifier 2072, a first input end of which is electrically connected to the output end of the first resistor 2071, and a second input end of which is electrically connected to the MCU208, for determining to obtain a first RX-LOS signal according to a first voltage at the first input end and a second voltage at the second input end. The first input terminal of the operational amplifier 2072 receives a first voltage obtained by inputting a photo-generated current to the first input terminal of the operational amplifier 2072 through the first resistor, and the second input terminal of the operational amplifier 2072 receives a second voltage obtained by inputting an RX-LOS threshold to the second input terminal of the operational amplifier 2072, so as to determine and obtain a first RX-LOS signal according to the first voltage and the second voltage.
When the voltage divider circuit 2073 is not provided, the first input voltage α at the first input terminal of the judgment circuit 207 and the second input voltage β at the second input terminal of the judgment circuit 207 are determined. At this time, the first voltage + IN at the first input terminal of the operational amplifier 2072 and the second voltage-IN at the second input terminal of the operational amplifier 2072 become β. When + IN > -IN, the output terminal of the operational amplifier 2072 outputs a high level (VOUT ═ 3), and the first RX-LOS signal output from the first output terminal of the judgment circuit 207 is high level. When + IN < -IN, the output terminal of the operational amplifier 2072 outputs a low level (VOUT ═ 0), and the first RX-LOS signal output from the first output terminal of the judgment circuit 207 is at a low level.
However, in this case, the optical module cannot realize hysteresis. In order to realize hysteresis of the optical module, a voltage divider circuit 2073 is provided in the embodiment of the present application.
The input terminal of the voltage divider circuit 2073 is electrically connected to the output terminal of the operational amplifier 2072, and the output terminal is electrically connected to the first input terminal of the operational amplifier 2072. The voltage divider circuit 2073 is a second resistor R2. The second resistor R2 is used to divide the voltage output from the output terminal of the operational amplifier 2072.
In the initial state, the first input voltage α at the first input terminal of the determination circuit 207 is 0, and the second input voltage β at the second input terminal of the determination circuit 207 is > 0. At this time, the first voltage + IN of the first input terminal of the operational amplifier 2072 is 0, and the second voltage-IN of the second input terminal of the operational amplifier 2072 is β. When + IN < -IN, the output terminal of the operational amplifier 2072 outputs a low level (VOUT ═ 0), and the first RX-LOS signal output from the first output terminal of the judgment circuit 207 is at a low level.
The input light intensity increases, the first input voltage α at the first input terminal of the determination circuit 207 increases accordingly, and the second input voltage β at the second input terminal of the determination circuit 207 does not change. At this time, the first voltage + IN of the first input terminal of the operational amplifier 2072 is R2/(R1+ R2) × α, and the second voltage-IN of the second input terminal of the operational amplifier 2072 is β. When + IN > -IN, the output terminal of the operational amplifier 2072 outputs a high level (VOUT ═ 3), and the first output terminal of the judgment circuit 207 outputs the first RX-LOS signal as a high level. That is, α > (R1+ R2) × β/R2 was obtained from R2/(R1+ R2) × α > β.
The first voltage + IN ═ R2/(R1+ R2) × α at the first input terminal of the operational amplifier 2072 is calculated as follows: in the initial state, the output terminal of the determination circuit 207 outputs a low voltage, i.e., VOUT is 0. Since the first resistor 2071 and the second resistor R2 are connected IN series, the current I flowing through the first resistor 2071 and the second resistor R2 is α/(R1+ R2), and at this time, the first voltage at the first input terminal of the operational amplifier 2072 is equal to the first input voltage at the first input terminal of the determination circuit 207 minus the voltage flowing through the first resistor 2071, i.e., + IN ═ R2/(R1+ R2) ·. At this time, the voltage flowing through the first resistor is α × R1/(R1+ R2).
The input light intensity decreases, the input voltage α at the first input terminal of the determination circuit 207 decreases accordingly, and the second input voltage β at the second input terminal of the determination circuit 207 does not change. At this time, the first voltage + IN of the first input terminal of the operational amplifier 2072 is α - (α -3) × R1/(R1+ R2), and the second voltage-IN of the second input terminal of the operational amplifier 2072 is β. When + IN < -IN, the output terminal of the operational amplifier 2072 outputs a low voltage (VOUT ═ 0), and the first output terminal of the judgment circuit 207 outputs the first RX-LOS signal at a low level. Namely, α < (R1+ R2) > β/R2-3R1/R2 was obtained from α - (α -3) × R1/(R1+ R2) < β.
The first voltage + IN ═ α - (α -3) × R1/(R1+ R2) at the first input terminal of the operational amplifier 2072 is calculated as follows: the input light intensity increases and the output terminal of the determination circuit 207 outputs a high voltage, i.e., VOUT — 3. Since the first resistor 2071 and the second resistor R2 are connected IN series, the current I flowing through the first resistor and the second resistor is (α -3)/(R1+ R2), and at this time, the first voltage at the first input terminal of the operational amplifier 2072 is equal to the first input voltage at the first input terminal of the determination circuit 207 minus the voltage flowing through the first resistor, i.e., + IN ═ R2/(R1+ R2) ×. At this time, the voltage flowing through the first resistor 2071 is (α -3) × R1/(R1+ R2).
In combination with the above, in the present application, after the first resistor 2071 and the second resistor R2 are set, the RX-LOS signal determining function and the RX-LOS signal delaying function can be realized only by setting the second input voltage β at the second input terminal of the determining circuit 207.
In this case, K1 is made (R1+ R2) × β/R2, K2 is made (R1+ R2) × β/R2-3R1/R2, and K1-K2 is calculated as 3 × R1/R2, that is, the RX-LOS signal determination hysteresis coefficient of the determination circuit 207 is 3 × R1/R2. In combination with the determination hysteresis coefficient, the RX-LOS signal hysteresis can be changed by adjusting the first resistor 2071 and the second resistor R2.
When the first input voltage at the first input terminal of the judgment circuit 207 is greater than K1, the first output terminal of the judgment circuit 207 outputs a high level. When the first input voltage at the first input terminal of the determining circuit 207 is less than K2, the first output terminal of the determining circuit 207 outputs a low level, wherein K1 and K2 are both related to the second input voltage β at the second input terminal of the determining circuit 207.
As shown in fig. 7, in the embodiment of the present application, the determining circuit 207 further includes a MOS transistor 2074 and a fourth resistor R42075.
In particular, the method comprises the following steps of,
the MOS transistor 2074 has a gate electrically connected to the output terminal of the operational amplifier 2072, a source grounded, and a drain connected to the power supply, and is configured to obtain the second RX-LOS signal.
Because the second RX-LOS signal output by the MOS transistor 2074 is synchronized and inverted with the first RX-LOS signal output by the operational amplifier 2072, the polarity inversion of the RX-LOS function is realized.
And an input terminal of the fourth resistor 2075 is electrically connected to the drain of the MOS transistor 2074, and an output terminal of the fourth resistor is connected to a power supply. The fourth resistor 2075 is used for sharing the voltage output by the power supply, so that the MOS transistor 2074 works normally.
Since the determining circuit 207 can obtain the first RX-LOS signal and the second RX-LOS signal at the same time, but the host computer can only receive one RX-LOS signal, a selecting circuit is disposed between the determining circuit 2074 and the gold finger. The selection circuit is located between the first output terminal and the second output terminal of the judgment circuit 2074 and the gold finger, and is used for selecting one RX-LOS signal from the first RX-LOS signal and the second RX-LOS signal to transmit to the gold finger. And the upper computer acquires an RX-LOS signal on the gold finger.
As shown in fig. 7, in the embodiment of the present application, the determining circuit 207 further includes a third resistor 2076. And an input end of the third resistor 2076 is electrically connected to the MCU, and an output end of the third resistor is electrically connected to a second input end of the operational amplifier 2072. Since the operational amplifier 2072 needs to input a bias current, and the first input terminal of the operational amplifier 2072 is connected to the first resistor 2071 and the second resistor, the second input terminal of the operational amplifier 2072 is electrically connected to a third resistor 2076, and the resistance of the third resistor 2076 is close to or equal to the parallel resistance of the first resistor 2071 and the second resistor.
The application provides an optical module, including the circuit board, with the light receiving assembly of circuit board electricity connection, set up MCU and the judgement circuit on the circuit board. The light receiving assembly is used for generating photo-generated current. The MCU is used for setting an RX-LOS threshold value. And the judging circuit is electrically connected with the first input end and the second input end, is electrically connected with the MCU, and is used for judging to obtain a first RX-LOS signal according to a first input voltage of the first input end and a second input voltage of the second input end and outputting the first RX-LOS signal through the first output end, wherein the first input voltage is a voltage obtained by inputting photoproduction current into the first input end, and the second input voltage is a voltage obtained by inputting an RX-LOS threshold value into the second input end. The judgment circuit comprises a first resistor, an operational amplifier and a voltage division circuit. The input end of the first resistor is electrically connected with the light receiving component. And the first input end of the operational amplifier receives a first voltage obtained by inputting the photoproduction current to the first input end of the operational amplifier through the first resistor, the second input end of the operational amplifier receives a second voltage obtained by inputting the RX-LOS threshold value to the second input end of the operational amplifier, and the operational amplifier is used for judging and obtaining a first RX-LOS signal according to the first voltage and the second voltage. And the input end of the voltage division circuit is electrically connected with the output end of the operational amplifier, and the output end of the voltage division circuit is electrically connected with the first input end of the operational amplifier. When the first voltage at the first input terminal of the operational amplifier is greater than the second voltage at the second input terminal of the operational amplifier, the first RX-LOS signal output by the output terminal of the operational amplifier is at a high level. When the first voltage at the first input terminal of the operational amplifier is lower than the second voltage at the second input terminal of the operational amplifier, the first RX-LOS signal output by the output terminal of the operational amplifier is at a low level. In the application, the judgment circuit is used for judging the RX-LOS signal, and the first RX-LOS signal is judged and output by directly utilizing the first voltage of the first input end of the operational amplifier and the second voltage of the second input end of the operational amplifier, so that the waiting time in a software algorithm is avoided, and the problem of instable RX-LOS time delay is effectively solved.
The same and similar parts among the embodiments in the specification are referred to each other. It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A light module, comprising:
a circuit board;
the light receiving assembly is electrically connected with the circuit board and used for generating photo-generated current;
the MCU is arranged on the circuit board and used for setting an RX-LOS threshold value;
a judging circuit, disposed on the circuit board, having a first input end electrically connected to the light receiving component and a second input end electrically connected to the MCU, for judging to obtain a first RX-LOS signal according to a first input voltage of the first input end and a second input voltage of the second input end, and outputting the first RX-LOS signal through a first output end, where the first input voltage is a voltage obtained by inputting the photo-generated current to the first input end of the judging circuit, and the second input voltage is a voltage obtained by inputting the RX-LOS threshold to the second input end of the judging circuit;
the judgment circuit includes:
the input end of the first resistor is electrically connected with the light receiving component;
the first input end of the operational amplifier receives a first voltage obtained by inputting the photo-generated current to the first input end of the operational amplifier through the first resistor, the second input end of the operational amplifier receives a second voltage obtained by inputting the RX-LOS threshold to the second input end of the operational amplifier, and the operational amplifier is used for judging to obtain a first RX-LOS signal according to the first voltage and the second voltage;
and the input end of the voltage division circuit is electrically connected with the output end of the operational amplifier, and the output end of the voltage division circuit is electrically connected with the first input end of the operational amplifier.
2. The optical module of claim 1, wherein the determination circuit further comprises:
and the grid electrode of the MOS tube is electrically connected with the output end of the operational amplifier, the source electrode of the MOS tube is grounded, and the drain electrode of the MOS tube is connected with the power supply and is used for obtaining a second RX-LOS signal.
3. The light module of claim 2, wherein the voltage divider circuit comprises a second resistor;
the second resistor is used for dividing the voltage output by the output end of the operational amplifier.
4. The optical module of claim 2, wherein the determination circuit further comprises:
and the input end of the third resistor is electrically connected with the MCU, and the output end of the third resistor is electrically connected with the second input end of the operational amplifier.
5. The optical module of claim 4, wherein the determination circuit further comprises:
and the input end of the fourth resistor is electrically connected with the drain electrode of the MOS tube, and the output end of the fourth resistor is connected with the power supply.
6. The optical module of claim 1, wherein the optical module further comprises a DSP;
the DSP is electrically connected with the light receiving component.
7. The light module of claim 1, further comprising a selection circuit:
the selection circuit is arranged between the judgment circuit and the golden finger and is used for selecting one RX-LOS signal from the first RX-LOS signal and the second RX-LOS signal to transmit to the golden finger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010568955.2A CN113824505A (en) | 2020-06-19 | 2020-06-19 | Optical module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010568955.2A CN113824505A (en) | 2020-06-19 | 2020-06-19 | Optical module |
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|---|---|---|---|---|
| US20040240892A1 (en) * | 2003-05-27 | 2004-12-02 | Abidin Cindra W. | Method and apparatus for detecting interruption of an input signal |
| CN102752045A (en) * | 2012-07-20 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module for optical network unit |
| CN106953696A (en) * | 2017-05-22 | 2017-07-14 | 福建亿芯源半导体股份有限公司 | Compatible 8472 agreements, the OLT transceiver chips of digital programmable |
| CN206629220U (en) * | 2017-04-18 | 2017-11-10 | 福建亿芯源半导体股份有限公司 | OLT transceiver chips |
| CN108880671A (en) * | 2018-06-20 | 2018-11-23 | 深圳市飞思卓科技有限公司 | The signal loss detection circuit and device of four-way optical module |
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2020
- 2020-06-19 CN CN202010568955.2A patent/CN113824505A/en not_active Withdrawn
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040240892A1 (en) * | 2003-05-27 | 2004-12-02 | Abidin Cindra W. | Method and apparatus for detecting interruption of an input signal |
| CN102752045A (en) * | 2012-07-20 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module for optical network unit |
| CN206629220U (en) * | 2017-04-18 | 2017-11-10 | 福建亿芯源半导体股份有限公司 | OLT transceiver chips |
| CN106953696A (en) * | 2017-05-22 | 2017-07-14 | 福建亿芯源半导体股份有限公司 | Compatible 8472 agreements, the OLT transceiver chips of digital programmable |
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Application publication date: 20211221 |