CN108847897B - Optical module - Google Patents
Optical module Download PDFInfo
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- CN108847897B CN108847897B CN201810877773.6A CN201810877773A CN108847897B CN 108847897 B CN108847897 B CN 108847897B CN 201810877773 A CN201810877773 A CN 201810877773A CN 108847897 B CN108847897 B CN 108847897B
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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
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
- H04B10/672—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal
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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
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
- H04B10/6931—Automatic gain control of the preamplifier
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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
- H04B10/697—Arrangements for reducing noise and distortion
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- Light Receiving Elements (AREA)
Abstract
The application provides an optical module, and particularly, a light power monitoring module and a voltage adjusting module are additionally arranged in the optical module, firstly, the light power monitoring module is used for monitoring the intensity of a light signal received by an avalanche photodiode, and when the light signal power is greater than a preset light power load point, a voltage control signal sent to the voltage adjusting module is generated; then, after the voltage adjusting module receives the voltage control signal, the output voltage of the trans-impedance amplifier is adjusted, so that the voltage of the positive output end is smaller than that of the negative output end. Therefore, by using the structure, when the light intensity of the optical module receiving signal is close to the light intensity of the overload point, the voltage of the positive output end of the transimpedance amplifier is still smaller than the voltage of the negative output end, so that the problem of duty ratio distortion of a TIA output signal caused by overlarge light intensity of the optical module receiving signal can be prevented, and the burst overload performance of the optical module can be improved.
Description
Technical Field
The present disclosure relates to the field of optical fiber communication technologies, and in particular, to an optical module.
Background
In an optical fiber communication system, an optical module is a kind of connection module that performs a photoelectric conversion function. A typical optical module generally includes a light receiving end and a light emitting end, wherein the light receiving end is used to convert a received optical signal into an electrical signal for further processing and identification.
Fig. 1 is a basic circuit diagram of a light receiving end in an optical module. With the circuit in fig. 1, a Microprocessor (MCU) 10 controls a boost control circuit 20 to output a high voltage signal, which is supplied to a high voltage pin of an Avalanche Photodiode (APD) 30 in a ROSA (Receiver Optical Subassembly), so that the Avalanche photodiode 30 can obtain a sufficient voltage to generate Avalanche, thereby generating a multiplication effect. After the avalanche photodiode 30 obtains a sufficient voltage, the received optical signal is converted into an electrical signal, and the electrical signal is converted into a differential signal by a Trans-Impedance Amplifier (TIA) in the rosa 40 and output to the limiting Amplifier 50, and the differential signal is shaped by the limiting Amplifier 50 and output through an electrical interface.
According to the illumination characteristic of the avalanche photodiode, the photo-generated current is proportional to the intensity of the received light signal, so that as the intensity of the received light signal by the APD increases, the current output by the APD to the TIA also increases. Further, according to the operating characteristics of the TIA, as the current at the input terminal of the TIA increases, the voltage at the positive output terminal of the corresponding TIA increases, and the voltage at the negative output terminal of the TIA decreases. Moreover, when the light intensity of the signal received by the optical module approaches the light intensity at the overload point, that is, when the current output by the APD to the TIA increases to a value near the overload point of the TIA, the voltage of the positive output end of the TIA is greater than the voltage of the negative output end, which causes distortion of the duty ratio of the signal output to the limiting amplifier 50, and the receiving index of the corresponding optical module at the overload point also deteriorates.
Disclosure of Invention
The embodiment of the invention provides an optical module, which aims to solve the problem that the duty ratio of a TIA output signal is distorted when the light intensity of a received signal of the optical module approaches the light intensity of an overload point in the prior art, so that the sudden overload index is influenced.
The embodiment of the invention provides an optical module, which specifically comprises an avalanche photodiode, a trans-impedance amplifier, an optical power monitoring module and a voltage adjusting module, wherein:
the avalanche photodiode is used for converting a received optical signal into a photocurrent, and transmitting the photocurrent to the transimpedance amplifier and the optical power monitoring module;
the optical power monitoring module is used for generating a voltage control signal when the optical signal power received by the avalanche photodiode is judged to be larger than a preset optical power overload point according to the photocurrent;
the output end of the voltage adjusting module is respectively connected with the positive output end and the negative output end of the transimpedance amplifier and used for receiving the voltage control signal and adjusting the output voltage of the transimpedance amplifier according to the voltage control signal, so that the voltage of the positive output end of the transimpedance amplifier is smaller than the voltage of the negative output end.
The beneficial effect of this application is as follows:
as can be seen from the above technical solutions, in the optical module provided in the embodiments of the present invention, by additionally providing an optical power monitoring module and a voltage adjusting module in the optical module, firstly, the optical power monitoring module is used to monitor the intensity of an optical signal received by an avalanche photodiode, and when it is monitored that the optical signal power is greater than a preset optical power load point, a voltage control signal sent to the voltage adjusting module is generated; then, after the voltage adjusting module receives the voltage control signal, the output voltage of the trans-impedance amplifier is adjusted, so that the voltage of the positive output end is smaller than that of the negative output end. Therefore, by using the structure, when the light intensity of the optical module receiving signal is close to the light intensity of the overload point, the voltage of the positive output end of the transimpedance amplifier is still smaller than the voltage of the negative output end, so that the problem of duty ratio distortion of a TIA output signal caused by overlarge light intensity of the optical module receiving signal can be prevented, and the burst overload performance of the optical module can be improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a basic circuit diagram of an optical receiver in an optical module in the prior art;
FIG. 2 is an electrical eye diagram of a transimpedance amplifier output signal in an optical module of the prior art;
fig. 3 is a basic block diagram of an optical receiving end in an optical module according to an embodiment of the present disclosure;
fig. 4 is a basic circuit diagram of an example one of a light receiving end in an optical module according to an embodiment of the present disclosure;
fig. 5 is a basic circuit diagram of a second example of an optical receiving end in an optical module according to an embodiment of the present application;
fig. 6 is a basic circuit diagram of an example three of an optical receiving end in an optical module according to an embodiment of the present application;
fig. 7 is a basic circuit diagram of the voltage adjustment module in fig. 6.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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 invention.
Fig. 2 is an electrical eye diagram of a transimpedance amplifier output signal in an optical module of the prior art. As shown in fig. 2, when the received light intensity of the conventional optical module increases to near the overload point of the transimpedance amplifier, the voltage of the positive output terminal of the transimpedance amplifier is greater than the voltage of the negative output terminal thereof, which causes a high cross point of the electric eye of the output signal thereof, and thus the reception index of the optical module at the overload point becomes poor. In view of the above problems, in this embodiment, an optical power monitoring module and a voltage adjusting module are added at a receiving end of an optical module to adjust an output voltage of a transimpedance amplifier, so as to improve the quality of an output signal of the optical module. The optical module provided in the present embodiment will be described in detail below with reference to the drawings.
Fig. 3 is a basic block diagram of an optical receiving end in an optical module according to an embodiment of the present disclosure. As shown in fig. 3, the optical module includes an avalanche photodiode 30, a transimpedance amplifier 40, an optical power monitoring module 60, and a voltage adjustment module 70, wherein:
the output end of the avalanche photodiode 30 is connected to the input ends of the transimpedance amplifier 40 and the optical power monitoring module 60, respectively, and is configured to convert the received optical signal into a photocurrent, and transmit the photocurrent to the transimpedance amplifier 40 and the optical power monitoring module 60;
the output end of the optical power monitoring module 60 is connected to the input end of the voltage adjusting module 70, and is configured to generate a voltage control signal when the optical signal power received by the avalanche photodiode 30 is judged to be greater than a preset optical power overload point according to the photocurrent;
the output end of the voltage adjusting module 70 is connected to the positive output end and the negative output end of the transimpedance amplifier 40, respectively, and is configured to receive the voltage control signal and adjust the output voltage of the transimpedance amplifier according to the voltage control signal, specifically, the voltage of the positive output end is pulled down, the voltage of the negative output end is pulled up, and finally, the voltage of the positive output end of the transimpedance amplifier 40 is smaller than the voltage of the negative output end.
The following circuit design may be used for the specific optical power monitoring module 60 and the voltage adjusting module 70. Fig. 4 is a basic circuit diagram of an example of a light receiving end in an optical module according to an embodiment of the present disclosure, as shown in fig. 4, in this embodiment, the optical power monitoring module 60 includes a mirror current source circuit 61, a voltage comparator 62, and a first sampling resistor R4, and the voltage adjusting module 70 includes a first resistor R1, a second resistor R2, a third resistor R3, and switches L1 and L2 connected in series.
Specifically, the output end of the microprocessor 10 is connected to the input end of the boost control circuit 20, the input end of the mirror current source circuit 61 is connected to the output end of the boost control circuit 20 in the optical module, the first output end is connected to the high-voltage pin of the avalanche photodiode 30, and the second output end is connected to the first input end of the voltage comparator 62 and one end of the first sampling resistor R4, respectively. A second input terminal of the voltage comparator 62 is connected to the reference voltage source, and an output terminal thereof is connected to an input terminal of the voltage adjusting module 70; the other end of the first sampling resistor R4 is grounded. The resistance value of the first sampling resistor R4 is set according to a preset optical power overload point, and specifically, when the preset received optical power is at the overload point, the current output value of the mirror current source circuit 61 determines IrefThe reference voltage source outputting a determined voltage Vref, e.g.The module is usually 3.3V or 1.8V, and correspondingly, the resistance value of the first sampling resistor R4 is Vref/Iref.
In the working process of the optical module, the microprocessor 10 controls the boost control circuit 20 to output a high-voltage signal, the high-voltage signal is divided into two bias paths with proportional current output through the mirror current source circuit 61, and one bias path is output and supplied to a high-voltage pin of the avalanche photodiode 30, so that the avalanche photodiode 30 obtains enough voltage to generate avalanche, and a multiplication effect is generated. The avalanche photodiode 30, upon acquiring a sufficient voltage, converts the received optical signal into a photocurrent signal and into a differential signal through the transimpedance amplifier 40. The other path may output a current proportional to the output photocurrent of the avalanche photodiode 30 and generate a sampled voltage at a first sampling resistor R4, which is input to a first input of the voltage comparator 62. When the optical power of the avalanche photodiode 30 receiving the optical signal is greater than the predetermined optical power overload point, the current output value of the mirror current source circuit 61 is greater than IrefFurther, the voltage across the first sampling resistor R4 is greater than the output voltage Vref of the reference voltage source, and since the first sampling resistor R4 is connected to the positive input terminal of the voltage comparator 62 in this embodiment, the voltage comparator 62 outputs a high level signal, which is used as a voltage control signal to be output to the voltage adjustment module 70. Of course, in a specific process, the first sampling resistor R4 may also be connected to the negative input terminal of the voltage comparator 62, and accordingly, the low level signal output by the voltage comparator 62 is output to the voltage adjustment module 70 as the voltage control signal.
As shown in fig. 4, in the voltage adjustment module 70, one end of the first resistor R1 is grounded, and one end of the third resistor R3 is connected to a power supply. The second resistor R2 is connected to one end of the first resistor R1 and is further connected to the positive output terminal of the transimpedance amplifier 40, and the second resistor R2 is connected to one end of the third resistor R3 and is further connected to the negative output terminal of the transimpedance amplifier 40. A first switch L1 is further arranged between the first resistor R1 and the second resistor R2, and a second switch L2 is further arranged between the second resistor R2 and the third resistor R3. The input terminals of the first switch L1 and the second switch L2 are both connected to the output terminal of the voltage comparator 62 in the optical power monitoring module 60 for receiving the voltage control signal, wherein the first switch L1 and the second switch L2 may adopt switching transistors, such as MOS-FET transistors, and are designed to be in the on state when receiving the voltage control signal, and to be in the off state otherwise.
In addition, in this embodiment, the first resistor R1, the second resistor R2, and the third resistor R3 are resistors with fixed resistance values, and in combination with the characteristics of the overload point of the existing transimpedance amplifier and the intensity of the optical signal received by the optical module, the voltage value at the two ends of the second resistor is a voltage value corresponding to the middle point of the preset optical power overload point and the receiving sensitivity of the transimpedance amplifier 40 by designing the power output voltage at one end of the third resistor R3 and the resistance values of the resistors R1, R2, and R3, so as to ensure that the voltage at the positive output end of the transimpedance amplifier 40 is smaller than the voltage at the negative output end.
By using the above voltage adjustment module circuit design, when the optical power received by the optical module is greater than the predetermined optical power overload point, the first switch L1 and the second switch L2 receive the voltage control signal from the voltage comparator 62, and further turn on the paths where the first resistor R1, the second resistor R2, and the third resistor R3 are located, so that the voltage of the positive output end of the transimpedance amplifier 40 is pulled down, the voltage of the negative output end is pulled up, and the voltage of the positive output end is smaller than that of the negative output end, so that the cross point of the eye diagram of the output signal becomes low, thereby improving the duty ratio of the output signal, and finally improving the overload receiving performance of the optical module.
Further, the optical module includes a limiting amplifier 50, an input end of which is connected to an output end of the transimpedance amplifier 40, and is configured to receive an output voltage signal of the transimpedance amplifier 40, adjust a voltage amplitude of the voltage signal, remove an excessively high or excessively low voltage value, and ensure that the circuit does not work abnormally due to an excessively high or excessively low voltage.
In the above embodiment, the mirror current source circuit 61, the voltage comparator 62 and the first sampling resistor R4 are used to convert the photocurrent signal output by the avalanche photodiode 30 into a voltage signal to monitor and sample the received optical power, so as to adjust the output voltage of the transimpedance amplifier 40.
Fig. 5 is a basic circuit diagram of a second example of an optical receiving end in an optical module according to an embodiment of the present application. As shown in fig. 5, in the present embodiment, the optical power monitoring module 60 includes a mirror current source circuit 61, a microprocessor 10, and a second sampling resistor R5.
Specifically, the input end of the mirror current source circuit 61 is connected to the output end of the boost control circuit 20 in the optical module, the first output end is connected to the high-voltage pin of the avalanche photodiode 30, and the second output end is connected to the input end of the microprocessor 10 and one end of the sampling resistor R5, respectively; the output terminal of the microprocessor 10 is connected to the input terminal of the voltage adjustment module 70, and is configured to generate a voltage control signal if the sampled voltage value of the second sampling resistor R5 is greater than a preset voltage value, where the resistance value and the preset voltage value of the second sampling resistor R5 can be set according to a preset optical power overload point.
In the working process of the optical module, the microprocessor 10 controls the boost control circuit 20 to output a high-voltage signal, the high-voltage signal is divided into two bias paths with proportional current output through the mirror current source circuit 61, and one bias path is output and supplied to a high-voltage pin of the avalanche photodiode 30, so that the avalanche photodiode 30 obtains enough voltage to generate avalanche, and a multiplication effect is generated. The avalanche photodiode 30, upon acquiring a sufficient voltage, converts the received optical signal into a photocurrent signal and into a differential signal through the transimpedance amplifier 40. The other path can output a current proportional to the output photocurrent of the avalanche photodiode 30 and generate a sampling voltage at the second sampling resistor R5, which is input to the RX power ADC input pin of the microprocessor 10 for receiving optical power monitoring sampling. Moreover, through the programming design of the inside of the microprocessor 10, when the optical power of the avalanche photodiode 30 receiving the optical signal is greater than the predetermined optical power overload point, correspondingly, the sampled voltage received by the microprocessor 10 is greater than the internal predetermined voltage value, and at this time, after comparing the received sampled voltage with the predetermined voltage value, the microprocessor 10 outputs a voltage control signal to the voltage adjustment module 70.
Further, the voltage adjustment module 70 in this embodiment is also designed as a circuit composed of the first resistor R1, the second resistor R2, the third resistor R3 and the switches L1 and L2 connected in series as in the first embodiment, furthermore, when the received optical power of the optical module is greater than the predetermined optical power overload point, the first switch L1 and the second switch L2 receive the voltage control signal, such as a high level signal or a low level signal, from the microprocessor 10, further, the paths of the first resistor R1, the second resistor R2, and the third resistor R3 are turned on, so that the voltage at the positive output terminal of the transimpedance amplifier 40 is pulled down, the voltage at the negative output terminal is pulled up, and the voltage of the positive output end is smaller than that of the negative output end, so that the cross point of an electric eye diagram of an output signal of the optical module is lowered, the duty ratio of the output signal is improved, and the overload receiving performance of the optical module is finally improved.
The above embodiments all convert the output photocurrent of the avalanche photodiode 30 into a sampling voltage for optical power monitoring, and a monitoring adjustment method for converting the output photocurrent of the avalanche photodiode 30 into optical power is provided below. Fig. 6 is a basic circuit diagram of an example three of an optical receiving end in an optical module according to an embodiment of the present application. As shown in fig. 6, the optical power monitoring module 61 in the present embodiment includes an optical power conversion unit 63 and a power determination unit 64.
Specifically, the optical power conversion unit 63 is configured to obtain optical power corresponding to the photocurrent according to the received photocurrent, and transmit the generated optical power value to the power determination unit 64. The power determining unit 64 is configured to generate a voltage control signal when the light output power value is greater than a preset light power overload point.
In this embodiment, the power determination unit 64 may be a signal processing chip having a simple processing function to recognize the magnitude relationship that the received optical power value is larger than the preset optical power overload point, such as a PON MAC chip, and internally provided with a processor for implementing various functions thereof, a transceiver for implementing communication with other devices, a memory for storing program codes, and the like.
Further, in order to realize that the optical module can dynamically adjust the output voltage of the transimpedance amplifier 40 according to the power of the received optical signal, in the present embodiment, the first resistor R1 and the third resistor R3 are resistors with adjustable resistance values, and the resistance values of the first resistor R1 and the third resistor R3 are set according to the photocurrent value sampled by the optical power conversion unit 63, that is, according to the intensity value of the optical signal received by the avalanche photodiode 30. In this embodiment, by dynamically adjusting the values of the first resistor R1 and the third resistor R3, and further, the voltage values at the two ends of the second resistor R2 can also be dynamically adjusted, so that the pull-down voltage of the positive output terminal and the pull-up voltage of the negative output terminal of the transimpedance amplifier 40 can also be dynamically adjusted, so as to ensure that the output voltage of the transimpedance amplifier 40 can be always within a proper range, and improve the receiving sensitivity of the optical module.
Specifically, in the present embodiment, the dynamic adjustment of the resistances of the first resistor R1 and the third resistor R3 is realized by controlling the switch to be opened or closed. Fig. 7 is a basic circuit diagram of the voltage adjustment module in fig. 6. As shown in fig. 7, in the present embodiment, the first resistor R1 is composed of at least two serially connected sub-resistors, each of which is connected in parallel with a sub-switch, and the input terminals of the sub-switches are connected to the output terminal of the power determining unit 64. Similarly, the third resistor R3 is composed of at least two series-connected sub-resistors, each of which is connected in parallel with a sub-switch, and the input terminals of the sub-switches are connected to the output terminal of the power determining unit 64.
Further, by designing the power determining unit 64, setting different levels of optical power thresholds, and selecting different sub-switches to transmit the closing control signal according to the threshold range of the optical power, for example, when the received optical power value is greater than the first optical power threshold and less than the second optical power threshold, N switches of the first resistor R1 and the third resistor R3 are selected to be closed, and when the received optical power value is greater than the second optical power threshold and less than the third optical power threshold, N-M switches of the first resistor R1 and the third resistor R3 are selected to be closed.
In addition, in addition to the way of designing the first resistor R1 and the third resistor R3 as resistors with adjustable resistance values, the second resistor R2 can also be designed as a resistor with adjustable resistance values, and the resistance value of the second resistor R2 is also set according to the photocurrent value sampled by the optical power conversion unit 63, that is, the intensity value of the optical signal received by the avalanche photodiode 30.
It should be noted that, in addition to the first resistor R1, the second resistor R2, and the third resistor R3, which are designed as resistors with adjustable resistance values by using a plurality of sub-switches and sub-resistors, other methods may be adopted, for example, each resistor is designed to be formed by connecting a resistor and a field effect transistor in parallel, and different voltages are applied to the gate of the field effect transistor according to the magnitude of the received optical power, so that the field effect transistor is equivalent to resistors with different resistance values, and the dynamic adjustment of the whole resistance value is realized.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is merely a detailed description of the invention, and it should be noted that modifications and adaptations by those skilled in the art may be made without departing from the principles of the invention, and should be considered as within the scope of the invention.
Claims (9)
1. An optical module comprising an avalanche photodiode and a transimpedance amplifier, characterized by further comprising an optical power monitoring module and a voltage adjustment module, wherein:
the avalanche photodiode is used for converting a received optical signal into a photocurrent, and transmitting the photocurrent to the transimpedance amplifier and the optical power monitoring module;
the optical power monitoring module is used for generating a voltage control signal when the optical signal power received by the avalanche photodiode is judged to be larger than a preset optical power overload point according to the photocurrent;
the output end of the voltage adjusting module is respectively connected with the positive output end and the negative output end of the transimpedance amplifier and used for receiving the voltage control signal and adjusting the output voltage of the transimpedance amplifier according to the voltage control signal, so that the voltage of the positive output end of the transimpedance amplifier is smaller than the voltage of the negative output end;
the voltage adjustment module comprises a first resistor, a second resistor and a third resistor which are connected in series, wherein:
one end of the first resistor is grounded, and one end of the third resistor is connected with a power supply;
one end of the second resistor, which is connected with the first resistor, is also connected with the positive output end of the transimpedance amplifier, and one end of the second resistor, which is connected with the third resistor, is also connected with the negative output end of the transimpedance amplifier;
a first switch is also arranged between the first resistor and the second resistor, and a second switch is also arranged between the second resistor and the third resistor;
and the input ends of the first switch and the second switch are connected with the output end of the optical power monitoring module and used for receiving the voltage control signal.
2. The optical module of claim 1, wherein the optical power monitoring module comprises a mirror current source circuit, a voltage comparator, and a first sampling resistor, wherein:
the input end of the mirror current source circuit is connected with the output end of a boost control circuit in the optical module, the first output end of the mirror current source circuit is connected with a high-voltage pin of the avalanche photodiode, and the second output end of the mirror current source circuit is respectively connected with the first input end of the voltage comparator and one end of the first sampling resistor;
the second input end of the voltage comparator is connected with a reference voltage source, and the output end of the voltage comparator is connected with the input end of the voltage adjusting module;
the other end of the first sampling resistor is grounded.
3. The optical module of claim 1, wherein the optical power monitoring module comprises a mirror current source circuit, a microprocessor, and a second sampling resistor, wherein:
the input end of the mirror current source circuit is connected with the output end of a boosting control circuit in the optical module, the first output end of the mirror current source circuit is connected with a high-voltage pin of the avalanche photodiode, and the second output end of the mirror current source circuit is respectively connected with the input end of the microprocessor and one end of the second sampling resistor;
the output end of the microprocessor is connected with the input end of the voltage adjusting module and is used for generating a voltage control signal if the sampling voltage value of the second sampling resistor is greater than a preset voltage value;
the other end of the second sampling resistor is grounded.
4. The optical module of claim 1, wherein the optical power monitoring module comprises an optical power conversion unit and a power determination unit, wherein:
the optical power conversion unit is used for acquiring optical power corresponding to the photocurrent according to the received photocurrent, and transmitting the optical power value to the power judgment unit;
and the power judgment unit is used for generating a voltage control signal when the optical power value is determined to be greater than a preset optical power overload point.
5. The optical module according to claim 1, wherein a voltage value across the second resistor is set to a voltage value corresponding to a midpoint of a predetermined optical power overload point and a transimpedance amplifier receive sensitivity.
6. The optical module as claimed in claim 1, wherein the first resistor and the third resistor are resistors with adjustable resistance values, and the resistance values of the first resistor and the third resistor are set according to the photocurrent value.
7. The optical module as claimed in claim 1, wherein the second resistor is a resistor with an adjustable resistance value, and the resistance value of the second resistor is set according to the photocurrent value.
8. The optical module as claimed in claim 1, wherein the first resistor comprises at least two serially connected sub-resistors, each sub-resistor is connected in parallel with a sub-switch, and the sub-switches are turned on or off according to the photocurrent value.
9. A light module as claimed in claim 6 or 8, characterized in that the third resistor is composed of at least two series-connected sub-resistors, each of which is connected in parallel with a sub-switch, which is switched on or off depending on the photocurrent value.
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| CN109067461A (en) * | 2018-08-21 | 2018-12-21 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN109495186B (en) * | 2018-11-29 | 2021-04-02 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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| CN112099026B (en) * | 2019-05-31 | 2023-11-24 | 宁波飞芯电子科技有限公司 | Decoherence effect processing device, decoherence effect processing system and method thereof |
| CN113687333A (en) * | 2020-05-16 | 2021-11-23 | 北醒（北京）光子科技有限公司 | Transmitting signal state monitoring circuit |
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Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581735A (en) * | 2003-08-08 | 2005-02-16 | 中兴通讯股份有限公司 | Optical receiving device for realizing luminous power adaptation of different inputs |
| CN201985863U (en) * | 2011-02-15 | 2011-09-21 | 武汉电信器件有限公司 | Burst mode code error tester for optical circuit terminal optical module of gigabit passive optical network |
| CN102209281A (en) * | 2011-05-18 | 2011-10-05 | 索尔思光电（成都）有限公司 | 10G EPON OLT (Ethernet passive optical network optical line terminal) single-fiber three-dimensional optical module |
| CN102324899A (en) * | 2011-08-24 | 2012-01-18 | 成都优博创技术有限公司 | Transresistance amplifier with received signal strength indication (RSSI) function |
| CN102752052A (en) * | 2012-07-23 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module of optical network unit and method for outputting control electric signal thereof |
| CN102946281A (en) * | 2012-11-01 | 2013-02-27 | 青岛海信宽带多媒体技术有限公司 | Method and device for controlling signal power |
| CN104158593A (en) * | 2014-08-27 | 2014-11-19 | 索尔思光电（成都）有限公司 | Method, circuit and equipment of processing LOS (Line of Sight) signal and eliminating oscillation |
| CN104320200A (en) * | 2014-11-17 | 2015-01-28 | 索尔思光电（成都）有限公司 | Circuit, optical module and method for protecting APD receiver |
| CN104508977A (en) * | 2014-10-22 | 2015-04-08 | 索尔思光电（成都）有限公司 | TIA with increased dynamic range and optical device thereof |
| CN104579497A (en) * | 2013-10-16 | 2015-04-29 | 深圳新飞通光电子技术有限公司 | Burst light receiving circuit |
| CN104617570A (en) * | 2015-01-08 | 2015-05-13 | 武汉电信器件有限公司 | Large-light input type A/D (Analog to Digital) sampling overvoltage protection circuit |
| CN105572821A (en) * | 2016-03-21 | 2016-05-11 | 四川新易盛通信技术有限公司 | Low-rate double-emission SFP optical module |
| CN205430254U (en) * | 2016-03-21 | 2016-08-03 | 成都新易盛通信技术股份有限公司 | Transmission rate 32Kbps~80Mbps receives and dispatches integrative SFP optical module |
| CN106464358A (en) * | 2014-06-05 | 2017-02-22 | 三菱电机株式会社 | Power monitoring device and receiving device |
| US9819421B1 (en) * | 2016-07-07 | 2017-11-14 | Oracle International Corporation | Extracting an embedded DC signal to provide a reference voltage for an optical receiver |
| CN107425924A (en) * | 2017-06-23 | 2017-12-01 | 千度芯通（厦门）微电子科技有限公司 | Cross point of eye pattern adjustment circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103460624B (en) * | 2011-01-25 | 2016-05-04 | 日本电信电话株式会社 | Optical signal detecting circuit and photoreceiver |
| US10439734B2 (en) * | 2016-07-01 | 2019-10-08 | Luxtera, Inc. | Method and system for waveguide delay based equalization with summing at single-ended to differential converters in optical communication |
-
2018
- 2018-08-03 CN CN201810877773.6A patent/CN108847897B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581735A (en) * | 2003-08-08 | 2005-02-16 | 中兴通讯股份有限公司 | Optical receiving device for realizing luminous power adaptation of different inputs |
| CN201985863U (en) * | 2011-02-15 | 2011-09-21 | 武汉电信器件有限公司 | Burst mode code error tester for optical circuit terminal optical module of gigabit passive optical network |
| CN102209281A (en) * | 2011-05-18 | 2011-10-05 | 索尔思光电（成都）有限公司 | 10G EPON OLT (Ethernet passive optical network optical line terminal) single-fiber three-dimensional optical module |
| CN102324899A (en) * | 2011-08-24 | 2012-01-18 | 成都优博创技术有限公司 | Transresistance amplifier with received signal strength indication (RSSI) function |
| CN102752052A (en) * | 2012-07-23 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module of optical network unit and method for outputting control electric signal thereof |
| CN102946281A (en) * | 2012-11-01 | 2013-02-27 | 青岛海信宽带多媒体技术有限公司 | Method and device for controlling signal power |
| CN104579497A (en) * | 2013-10-16 | 2015-04-29 | 深圳新飞通光电子技术有限公司 | Burst light receiving circuit |
| CN106464358A (en) * | 2014-06-05 | 2017-02-22 | 三菱电机株式会社 | Power monitoring device and receiving device |
| CN104158593A (en) * | 2014-08-27 | 2014-11-19 | 索尔思光电（成都）有限公司 | Method, circuit and equipment of processing LOS (Line of Sight) signal and eliminating oscillation |
| CN104508977A (en) * | 2014-10-22 | 2015-04-08 | 索尔思光电（成都）有限公司 | TIA with increased dynamic range and optical device thereof |
| CN104320200A (en) * | 2014-11-17 | 2015-01-28 | 索尔思光电（成都）有限公司 | Circuit, optical module and method for protecting APD receiver |
| CN104617570A (en) * | 2015-01-08 | 2015-05-13 | 武汉电信器件有限公司 | Large-light input type A/D (Analog to Digital) sampling overvoltage protection circuit |
| CN105572821A (en) * | 2016-03-21 | 2016-05-11 | 四川新易盛通信技术有限公司 | Low-rate double-emission SFP optical module |
| CN205430254U (en) * | 2016-03-21 | 2016-08-03 | 成都新易盛通信技术股份有限公司 | Transmission rate 32Kbps~80Mbps receives and dispatches integrative SFP optical module |
| US9819421B1 (en) * | 2016-07-07 | 2017-11-14 | Oracle International Corporation | Extracting an embedded DC signal to provide a reference voltage for an optical receiver |
| CN107425924A (en) * | 2017-06-23 | 2017-12-01 | 千度芯通（厦门）微电子科技有限公司 | Cross point of eye pattern adjustment circuit |
Non-Patent Citations (1)
| Title |
|---|
| CDMA 光模块交调失真特性分析及其改善;胡新艳，刘金梅，李爱涛，霍文晓;《光电工程》;20130228;全文 * |
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