An optoelectronic detection circuit and an optoelectronic module

Abstract

The present invention relates to the field of optoelectronic communication, and particularly to an optoelectronic detection circuit and an optoelectronic module. The optoelectronic detection circuit includes an optoelectronic detection module and a comparator. The optoelectronic detection module includes a photodiode and a load resistor connected in parallel. The first end of the optoelectronic detection module is grounded, and the second end of the optoelectronic detection module is connected to the non-inverting input terminal of the comparator and is connected to the inverting input terminal of the comparator through a low-pass filter. The comparator outputs a detection level signal from the output terminal according to the input signals at the non-inverting input terminal and the inverting input terminal. The present invention also relates to an optoelectronic module. By designing an optoelectronic detection circuit and an optoelectronic module, in view of the harsh power consumption requirements, using the photoelectric effect of the photodiode, an optoelectronic detection circuit without a reverse bias voltage is set, thereby minimizing the current generated by the reverse bias voltage and reducing the power consumption.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic communication, and particularly to an optoelectronic detection circuit and an optoelectronic module. Background Art

[0002] In optoelectronic communication transmission, it is necessary to perform optoelectronic conversion on the optical signal of OSC, but at the same time, there are stringent restrictions on energy consumption.

[0003] In the existing optoelectronic detection solutions, as Figure 1 shown, it is necessary to apply a reverse bias voltage 130 to the photodiode 110 and transmit the electrical signal to the comparator 120. Although the photodiode 110 has a high responsivity and good linearity under the action of the reverse bias voltage 130, when the optical signal is large, a large current will be generated and the power consumption of the power supply is relatively large.

[0004] Particularly, in an application scenario with extremely stringent power consumption requirements, the power consumption requirements cannot be met, which is a very fatal drawback and one of the factors that have been restricting the development of the optoelectronic communication field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is, in view of the above-mentioned defects of the prior art, to provide an optoelectronic detection circuit to solve the problem that when the optical signal is large in the existing optoelectronic detection solution, a large current will be generated and the power consumption of the power supply is relatively large.

[0006] The technical problem to be solved by the present invention is, in view of the above-mentioned defects of the prior art, to provide an optoelectronic module to solve the problem that when the optical signal is large in the existing optoelectronic detection solution, a large current will be generated and the power consumption of the power supply is relatively large.

[0007] The technical solution adopted by the present invention to solve its technical problems is: to provide an optoelectronic detection circuit, the optoelectronic detection circuit includes an optoelectronic detection module and a comparator, the optoelectronic detection module includes a photodiode and a load resistor connected in parallel, the negative electrode of the optoelectronic detection module is grounded, the positive electrode of the optoelectronic detection module is connected to the positive input terminal of the comparator, and is connected to the negative input terminal of the comparator through a low-pass filter; the comparator outputs a detection level signal from the output terminal according to the input signals at the positive input terminal and the negative input terminal.

[0008] Among them, a preferred solution is: the optoelectronic detection circuit further includes a no-light detection module and an enable switch, the enable switch is connected to the output terminal of the comparator, and the no-light detection module is arranged between the optoelectronic detection module and the enable switch; if the no-light detection module detects that the optoelectronic detection module generates an electrical signal, it controls the enable switch to turn on, otherwise it controls the enable switch to turn off.

[0009] Among them, the preferred solution is that the lightless detection module sets a preset threshold value. The lightless detection module acquires the voltage amplitude of the optical signal and compares it with the preset threshold value. If the voltage amplitude is lower than the preset threshold value, a lightless signal is output; otherwise, a light signal is output.

[0010] Among them, the preferred solution is that the enable switch includes a control chip. The control chip includes an enable terminal, and the enable terminal is connected to the lightless detection module. When the enable terminal of the control chip receives an irrelevant signal, the output terminal of the comparator is closed; otherwise, the output terminal of the comparator is opened.

[0011] Among them, the preferred solution is that the comparator is a hysteresis comparator.

[0012] The technical solution adopted by the present invention to solve its technical problems is to provide an optoelectronic module. The optoelectronic module includes a housing, an optoelectronic detection circuit, and a power input terminal. The optoelectronic detection circuit is arranged in the housing. The optoelectronic detection circuit includes an optoelectronic detection module and a comparator. The optoelectronic detection module includes a photodiode and a load resistor connected in parallel. The negative electrode of the optoelectronic detection module is grounded. The positive electrode of the optoelectronic detection module is connected to the positive input terminal of the comparator and is connected to the negative input terminal of the comparator through a low-pass filter. The comparator outputs a detection level signal from the output terminal according to the signals input to the positive input terminal and the negative input terminal; one end of the power input terminal is connected to the comparator, and one end is connected to an external power supply.

[0013] Among them, the preferred solution is that the optoelectronic module further includes a transmission optical fiber arranged on the housing and conducting with the inside of the housing. The output port of the transmission optical fiber is aligned with the photodiode. The optical signal is output from the output port of the transmission optical fiber and transmitted into the photodiode, and the photodiode converts the optical signal into an electrical signal.

[0014] Among them, the preferred solution is that the optoelectronic module further includes a signal line arranged on the housing and connected to the output terminal of the comparator.

[0015] The beneficial effect of the present invention is that, compared with the prior art, by designing an optoelectronic detection circuit and an optoelectronic module, in view of the harsh power consumption requirements, using the photoelectric effect of the photodiode, an optoelectronic detection circuit that does not require a reverse bias voltage is set, thereby minimizing the current generated by the reverse bias voltage and reducing the power consumption; and, since no bias voltage is used, the photodiode does not extract energy from the power supply, thereby greatly reducing the overall power consumption increase when the optical signal is strong. Description of the Drawings

[0016] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0017] Figure 1It is a schematic structural diagram of an existing optoelectronic detection solution;

[0018] Figure 2 It is a schematic structural diagram of the optoelectronic detection circuit of the present invention;

[0019] Figure 3 It is a specific schematic structural diagram of the optoelectronic detection circuit of the present invention. Detailed implementation manners

[0020] Now, in combination with the accompanying drawings, detailed descriptions will be made on the preferred embodiments of the present invention.

[0021] As Figure 2 shown, the present invention provides a preferred embodiment of an optoelectronic detection circuit.

[0022] An optoelectronic detection circuit, the optoelectronic detection circuit includes an optoelectronic detection module 210 and a comparator 220. The optoelectronic detection module 210 includes a photodiode 211 and a load resistor 212 connected in parallel. The negative electrode of the optoelectronic detection module 210 is grounded, and the positive electrode of the optoelectronic detection module 210 is connected to the non-inverting input terminal of the comparator 220 and is connected to the inverting input terminal of the comparator 220 through a low-pass filter 230; the comparator 220 outputs a detection level signal from the output terminal according to the input signals at the non-inverting input terminal and the inverting input terminal.

[0023] Among them, like an ordinary diode, the photodiode 211 is also a semiconductor device composed of a PN junction and also has the characteristic of unidirectional conductivity. However, in the circuit, it is not used as a rectifying element, but an optoelectronic sensor that converts optical signals into electrical signals. When an ordinary diode is under the action of a reverse voltage, it is in a cut-off state and only a very weak reverse current can flow through. When the photodiode 211 is designed and manufactured, the area of the PN junction is made relatively large as much as possible to receive incident light; and the photodiode 211 works under the action of a reverse voltage. When there is no light, the reverse current is extremely weak, called dark current; when there is light, the reverse current rapidly increases to dozens of microamperes, called photocurrent, and the greater the intensity of the light, the greater the reverse current. The change of light causes the current of the photodiode 211 to change, which can convert the optical signal into an electrical signal and become an optoelectronic sensor.

[0024] Among them, the comparator 220 is a circuit that compares an analog voltage signal with a reference voltage. The two inputs of the comparator 220 are analog signals, and the output is a binary signal 0 or 1. When the difference between the input voltages increases or decreases and the positive and negative signs remain unchanged, its output remains constant. Among them, the signal passes through the low-pass filter 230 to provide a judgment reference voltage to the inverting input terminal of the comparator 220. When the signal level input to the non-inverting input terminal of the comparator 220 is greater than the reference voltage at the inverting input terminal, the output terminal outputs a logic 1 level; otherwise, the output terminal outputs a logic 0 level.

[0025] Among them, the low-pass filter 230 is an electronic filtering device that allows signals below the cut-off frequency to pass through, but does not allow signals above the cut-off frequency to pass through. Moreover, the signal output from the low-pass filter 230 will leave a quasi-DC component and be input to one end of the comparator as a judgment reference voltage.

[0026] Among them, according to Ohm's law U = I*R, after the photodiode 211 generates a signal current I and passes through the load resistor 212, a voltage U is generated.

[0027] Specifically, using the photoelectric effect of the photodiode 211, the photodiode 211 generates a current according to the optical signal and transmits the current to the non-inverting input terminal of the comparator 220. Moreover, after the current generated by the photodiode 211 according to the optical signal passes through the low-pass filter 230 for low-pass filtering, the filtered current is transmitted to the inverting input terminal of the comparator 220.

[0028] Specifically, a conventional circuit (prior art, reference Figure 1 ) when detecting a 3 dBm optical signal,

[0029] The power consumption P = (2 mA + 0.7 mA)*3.3 V = 8.91 mW; among them, 2 mA is the photodiode current and 0.7 mA is the static current of the operational amplifier.

[0030] When the photoelectric detection circuit of this embodiment detects a 3 dBm optical signal,

[0031] The power consumption P = 0.7 mA*3.3 V = 2.31 mW; among them, 0.7 mA is the static current of the operational amplifier.

[0032] Therefore, the power consumption of the photoelectric detection circuit of this embodiment is theoretically only 26% of that of the conventional circuit.

[0033] As Figure 3 shown, the present invention provides a preferred embodiment of a lightless detection module 240 and an enable switch 250.

[0034] The photoelectric detection circuit further includes a lightless detection module 240 and an enable switch 250. The enable switch 250 is connected to the output terminal of the comparator 220. The lightless detection module 240 is disposed between the photoelectric detection module 210 and the enable switch 250; if the lightless detection module 240 detects that the photoelectric detection module 210 generates an electrical signal, it controls the enable switch 250 to turn on, otherwise it controls the enable switch 250 to turn off.

[0035] Among them, the lightless detection module 240 determines that there is no light when detecting that the voltage amplitude of the signal light is lower than a set threshold. One implementation is through a comparator and an enable switch. Specifically, the lightless detection module 240 sets a preset threshold, obtains the voltage amplitude of the optical signal, and compares it with the preset threshold. If the voltage amplitude is lower than the preset threshold, it outputs a lightless signal; otherwise, it outputs a signal indicating the presence of light.

[0036] Among them, the enable switch 250 includes a control chip, the control chip includes an enable terminal, and the enable terminal is connected to the lightless detection module 240. When the enable terminal of the control chip receives an irrelevant signal, the output terminal of the comparator is closed; otherwise, the output terminal of the comparator is opened.

[0037] In this embodiment, the comparator 220 is a hysteresis comparator 220, and the hysteresis comparator 220 is a comparator 220 with a hysteresis loop transfer characteristic. Based on the inverting input single-threshold voltage comparator 220, a positive feedback network is introduced to form an inverting input hysteresis comparator 220 with double threshold values. Due to the effect of feedback, the threshold voltage of this comparator 220 changes with the output voltage. Its sensitivity is lower, but the anti-interference ability is greatly improved.

[0038] Moreover, by combining the hysteresis comparator 220 with the lightless detection module 240 and the enable switch 250, the ability to judge photoelectric conversion is further improved.

[0039] In the present invention, a preferred embodiment of an optoelectronic module is provided.

[0040] An optoelectronic module, the optoelectronic module includes a housing, an optoelectronic detection circuit, and a power input terminal. The optoelectronic detection circuit is arranged in the housing. The optoelectronic detection circuit includes an optoelectronic detection module 210 and a comparator 220. The optoelectronic detection module 210 includes a photodiode 211 and a load resistor 212 connected in parallel. The negative electrode of the optoelectronic detection module 210 is grounded, and the positive electrode of the optoelectronic detection module 210 is connected to the non-inverting input terminal of the comparator 220 and is connected to the inverting input terminal of the comparator 220 through a low-pass filter 230. The comparator 220 outputs a detection level signal from the output terminal according to the signals input to the non-inverting input terminal and the inverting input terminal; one end of the power input terminal is connected to the comparator 220, and one end is connected to an external power supply.

[0041] Among them, the optoelectronic detection module 210 is the part in the optoelectronic module that converts the optical signal into an electrical signal, and the detected electrical signal will be input to the subsequent processor for further digital operation processing. OSC (Optical Supervisory Channel) is a special optical signal wavelength in the optical communication network.

[0042] In this embodiment, the optoelectronic module further includes a transmission optical fiber disposed on the housing and conducting with the inside of the housing. The output port of the transmission optical fiber is aligned with the photodiode 211. The optical signal is output from the output port of the transmission optical fiber and transmitted into the photodiode 211, and the photodiode 211 converts it into an electrical signal according to the optical signal.

[0043] In this embodiment, the optoelectronic module further includes a signal line disposed on the housing and connected to the output end of the comparator 220.

[0044] The above are only the best embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes or modifications made according to the scope of the patent application of the present invention are covered by the present invention.

Claims

1. An optoelectronic detection circuit, characterized in that: the optoelectronic detection circuit includes an optoelectronic detection module and a comparator. The optoelectronic detection module includes a photodiode and a load resistor connected in parallel. The negative electrode of the optoelectronic detection module is grounded. The positive electrode of the optoelectronic detection module is connected to the positive input terminal of the comparator and is connected to the negative input terminal of the comparator through a low-pass filter. The comparator outputs a detection level signal from the output terminal according to the input signals at the positive input terminal and the negative input terminal; the optoelectronic detection circuit further includes a no-light detection module and an enable switch. The enable switch is connected to the output terminal of the comparator. The no-light detection module is arranged between the optoelectronic detection module and the enable switch. If the no-light detection module detects that the optoelectronic detection module generates an electrical signal, it controls the enable switch to turn on; otherwise, it controls the enable switch to turn off; the no-light detection module sets a preset threshold. The no-light detection module acquires the voltage amplitude of the optical signal and compares it with the preset threshold. If the voltage amplitude is lower than the preset threshold, it outputs a no-light signal; otherwise, it outputs a light signal. Among them, the comparator is a hysteresis comparator.

2. The optoelectronic detection circuit according to claim 1, characterized in that: the enable switch includes a control chip. The control chip includes an enable terminal. The enable terminal is connected to the no-light detection module. When the enable terminal of the control chip receives an irrelevant signal, it closes the output terminal of the comparator; otherwise, it opens the output terminal of the comparator.

3. An optoelectronic module, characterized in that: the optoelectronic module includes a housing, a power input terminal, and the optoelectronic detection circuit according to any one of claims 1-2. The optoelectronic detection circuit is arranged in the housing. The optoelectronic detection circuit includes an optoelectronic detection module and a comparator. The optoelectronic detection module includes a photodiode and a load resistor connected in parallel. The negative electrode of the optoelectronic detection module is grounded. The positive electrode of the optoelectronic detection module is connected to the positive input terminal of the comparator and is connected to the negative input terminal of the comparator through a low-pass filter. The comparator outputs a detection level signal from the output terminal according to the input signals at the positive input terminal and the negative input terminal. One end of the power input terminal is connected to the comparator and the other end is connected to an external power supply.

4. The optoelectronic module according to claim 3, characterized in that: the optoelectronic module further includes a transmission optical fiber arranged on the housing and conducting with the inside of the housing. The output port of the transmission optical fiber is aligned with the photodiode. The optical signal is output from the output port of the transmission optical fiber and transmitted into the photodiode. The photodiode converts the optical signal into an electrical signal.

5. The optoelectronic module according to claim 4, characterized in that: the optoelectronic module further includes a signal line arranged on the housing and connected to the output terminal of the comparator.

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