Monitoring driving circuit of high-frequency photoelectric detector

Abstract

The utility model provides a high-frequency photoelectric detector monitoring drive circuit, and relates to the technical field of high-speed optical fiber communication. The utility model provides a high frequency photoelectric detector monitoring drive circuit comprising a light splitting detection and signal processing unit which is composed of a light splitting detector, a logarithmic amplifier and a corresponding circuit; the signal transmission and indication unit is composed of an analog-to-digital converter (ADC), a single chip microcomputer, a corresponding accessory circuit and a corresponding interface; the power supply voltage stabilization and power supply filtering unit is composed of an input filtering circuit, a voltage stabilization module and an output filtering circuit; the anti-reverse connection and electrostatic protection unit is composed of an input filter circuit and an output filter circuit, wide-range power supply driving is achieved, adaptability is enhanced, input optical power monitoring of the 110 GHz high-frequency photoelectric detector is achieved, and a user can conveniently read the input optical power in real time.

Description

Technical Field

[0001] This utility model relates to the field of high-speed optical fiber communication, and in particular to a high-frequency photodetector monitoring and driving circuit. Background Technology

[0002] Photoelectric detection is an essential component in professional fields such as high-speed optical communication and analog optoelectronic systems. In the era of explosive growth in communications, communication capacity is increasing, and the requirements for data transmission and processing speeds are constantly increasing, placing ever higher demands on the operating frequency of photoelectric detectors.

[0003] As the frequency of detectors increases, the difficulty of their manufacturing and testing increases exponentially, resulting in extremely high prices. A 70GHz bandwidth photodetector costs tens of thousands of RMB, while a high-speed photodetector with a bandwidth of 110GHz costs over 100,000 RMB – dozens of times the price of the same weight of gold. Furthermore, high-speed, sensitive photodetectors are easily damaged by high voltage, high input light, and strong static electricity, causing irreparable damage. Therefore, designing a drive circuit with input light power monitoring and protection for high-speed detectors is essential.

[0004] Existing photodetector drivers are generally limited to providing operating voltage and basic electrostatic protection, but lack input optical power monitoring capabilities, making them susceptible to damage due to misoperation.

[0005] Therefore, it is necessary to provide a high-frequency photodetector monitoring and driving circuit to solve the above-mentioned technical problems. Utility Model Content

[0006] This invention provides a monitoring and driving circuit for a high-frequency photodetector, which solves the problem that existing photodetector drives are generally limited to providing operating voltage and basic electrostatic protection, lack input optical power monitoring, and are easily damaged due to misoperation.

[0007] To solve the above-mentioned technical problems, the high-frequency photodetector monitoring drive circuit provided by this utility model includes:

[0008] The spectral detection and signal processing unit consists of a spectral detector, a logarithmic amplifier, and corresponding circuits. This unit is responsible for spectrally detecting and converting the input optical power of the 110GHz high-frequency detector into an analog voltage signal, which provides a recognizable acquisition signal for the next-level unit.

[0009] The signal transmission and indication unit consists of an analog-to-digital converter (ADC), a microcontroller, and corresponding auxiliary circuits and interfaces. This unit is responsible for digitally acquiring the analog voltage signal converted by the spectrophotometer and processing it through the microcontroller to finally form a digital signal, which is then transmitted through an external interface. External devices can access the signal according to the defined instructions.

[0010] The power supply regulation and filtering unit consists of an input filtering circuit, a voltage regulation module, and an output filtering circuit, which provides low ripple power supply for the 110GHz high-frequency detector and enables wide voltage range input capability.

[0011] The reverse connection and electrostatic discharge protection unit consists of an input filter circuit and an output filter circuit. This unit provides electrostatic discharge protection as well as protection against overvoltage and reverse connection.

[0012] Preferably, the spectrophotometer has three parts: an optical input terminal, an optical output terminal, and an electrical signal pin. The optical input terminal is connected to the input signal optical interface, the optical output terminal is connected to the optical input of the 110GHz high-frequency detector, and the electrical signal pin is connected to the input of the logarithmic amplifier.

[0013] Preferably, the output of the logarithmic amplifier is connected to the analog input of the analog-to-digital converter, and the digital output of the analog-to-digital converter is connected to the I / O pin of the microcontroller.

[0014] Preferably, the communication port of the microcontroller is brought out as an external interface.

[0015] Preferably, the input filtering circuit is connected to the power supply input port, and the filtered voltage enters the voltage regulator module. The regulated voltage then enters the output filtering circuit again and is connected to the power supply interface of the 110GHz high-frequency detector to provide the required low ripple voltage. The output voltage is also connected to the status indicator light.

[0016] Preferably, the filtering components of the input filter circuit and the output filter circuit are unidirectional transient voltage suppressor diodes (TVS).

[0017] Preferably, the unidirectional transient voltage suppression diode TVS includes an input transient voltage suppression diode TVS1 and an output transient voltage suppression diode TVS2.

[0018] Preferably, the input transient voltage suppressor diode TVS1 is connected in parallel with the power supply port, and the output transient voltage suppressor diode TVS2 is connected in parallel with the power supply interface of the 110GHz high-frequency detector.

[0019] Compared with related technologies, the high-frequency photodetector monitoring and driving circuit provided by this utility model has the following advantages:

[0020] This invention provides a monitoring and driving circuit for a high-frequency photodetector, which enables wide-range power supply and driving, enhances adaptability, and realizes the monitoring of the input optical power of a 110GHz high-frequency photodetector, allowing users to conveniently read the input optical power in real time. It also includes reverse connection protection and electrostatic discharge protection circuits, effectively protecting the expensive and fragile 110GHz high-frequency photodetector. Attached Figure Description

[0021] Figure 1 A schematic diagram of the circuit structure of the first embodiment of the high-frequency photodetector monitoring drive circuit provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the circuit structure of a traditional photodetector;

[0023] Figure 3 This is a circuit diagram of the microcontroller in this utility model;

[0024] Figure 4 This is a circuit diagram of the signal transmission and indication unit in this utility model;

[0025] Figure 5 This is a circuit diagram of the logarithmic amplifier in this utility model;

[0026] Figure 6 This is a circuit diagram of the power input port and indicator light interface in this utility model;

[0027] Figure 7 This is a circuit diagram of the voltage regulator module in this utility model;

[0028] Figure 8 This is a circuit diagram of the analog-to-digital converter (ADC) in this utility model. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] First Embodiment

[0031] Please refer to the following: Figure 1 ,in, Figure 1 A schematic diagram of the circuit structure of the first embodiment of the high-frequency photodetector monitoring and driving circuit provided by this utility model. The high-frequency photodetector monitoring and driving circuit includes:

[0032] The spectral detection and signal processing unit consists of a spectral detector, a logarithmic amplifier, and corresponding circuits. This unit is responsible for spectrally detecting the input optical power of the 110GHz high-frequency detector and performing IV conversion to form an analog voltage signal, which provides a recognizable acquisition signal for the next stage unit.

[0033] The signal transmission and indication unit consists of an analog-to-digital converter (ADC), a microcontroller, and corresponding auxiliary circuits and interfaces. This unit is responsible for digitally acquiring the analog voltage signal converted by the spectrophotometer and processing it through the microcontroller to finally form a digital signal, which is then transmitted through an external interface. External devices can access the signal according to the defined instructions.

[0034] The power supply regulation and filtering unit consists of an input filtering circuit, a voltage regulation module, and an output filtering circuit. It provides low-ripple power supply for the 110GHz high-frequency detector and enables wide voltage range input capability.

[0035] The reverse connection and electrostatic discharge protection unit consists of an input filter circuit and an output filter circuit. This unit provides electrostatic discharge protection as well as protection against overvoltage and reverse connection.

[0036] The spectrometer consists of three parts: an optical input terminal, an optical output terminal, and electrical signal pins. The optical input terminal is connected to the input signal optical interface, the optical output terminal is connected to the optical input of the 110GHz high-frequency detector, and the electrical signal pins are connected to the input of the logarithmic amplifier. The output of the logarithmic amplifier is connected to the analog input of the analog-to-digital converter (ADC), the digital output of the ADC is connected to the I / O pins of the microcontroller, and the microcontroller's communication port is brought out as an external interface. The input filter circuit is connected to the power supply input port, and the filtered voltage enters the voltage regulator module. The regulated voltage then enters the output filter circuit and is connected to the power supply interface of the 110GHz high-frequency detector to provide the required low-ripple voltage. The output voltage is also connected to the status indicator light. The filtering components of the input and output filter circuits are unidirectional transient voltage suppressor diodes (TVS). The unidirectional TVS includes an input transient voltage suppressor diode (TVS1) and an output transient voltage suppressor diode (TVS2). The input transient voltage suppressor diode (TVS1) is connected in parallel with the power supply port, and the output transient voltage suppressor diode (TVS2) is connected in parallel with the power supply interface of the 110GHz high-frequency detector.

[0037] Compared with related technologies, the high-frequency photodetector monitoring and driving circuit provided by this utility model has the following advantages:

[0038] This utility model can convert high-frequency laser optical carrier signals into high-frequency radio frequency signals, thanks to its ultra-high-performance photodetector with a frequency up to 110GHz. The drive circuit can operate normally with a wide input range of DC 2.5V to 20V, and has high-voltage input protection and electrostatic discharge protection. The drive circuit supports monitoring of the input optical power of the 110GHz high-frequency photodetector.

[0039] Second embodiment

[0040] Please refer to the following: Figure 3 , Figure 4 , Figure 5 and Figure 8 Input optical power monitoring of a 110GHz high-frequency photodetector;

[0041] The input signal light is fed into a beam splitter via an optical flange connection. The beam splitter converts the DC intensity of the input light into a photocurrent signal. This photocurrent signal is amplified by a logarithmic amplifier and converted into a voltage signal. This voltage signal is then converted into a digital signal by an analog-to-digital converter and finally sent to a microcontroller for data processing and forwarding. After passing through the beam splitter, the input light signal enters a 110GHz high-frequency photodetector for signal detection and is converted into a high-frequency radio frequency signal, which is output through an RF flange. The beam splitter uses the SUN-TAPD series from Guilin Guanglong Integrated Circuit Co., Ltd., which features a wide operating wavelength (1510nm~1610nm), high responsivity (35mA / W@5%), and low insertion loss (0.6dB). The beam splitting ratio is 5%, meaning that 5% of the light intensity from the main beam is fed into the beam splitter for photoelectric conversion. The photocurrent enters a logarithmic amplifier for I / V conversion, becoming a voltage signal. The logarithmic amplifier used is the Analog Devices AD8304, which features an ultra-high dynamic range of 160dB and an ultra-wide current detection range covering 100pA to 10mA. This translates to a directly monitorable optical power range of -70 to +10dBm. Adding a 5% splitting ratio, the detectable main channel optical power range is calculated to be -57 to +23dBm, sufficient to cover all possible input optical power for this detector model. The analog-to-digital converter (ADC) used is the Texas Instruments ADS1220, a low-power, 24-bit, 2kSPS high-performance, high-speed detector. Its high-speed characteristics enable real-time detection. The microcontroller used is the STMicroelectronics STM32G030 series, a 32-bit microcontroller with 64k Flash memory and 8k storage. It is mature, stable, inexpensive, and readily available, offering excellent cost-effectiveness for optical power detection and data transmission.

[0042] Third embodiment

[0043] Please refer to the following: Figure 6 and Figure 7 110GHz high-frequency photodetector with wide voltage input and power supply filtering;

[0044] The power supply for the 110GHz high-frequency photodetector is provided by an external voltage source from the power supply port. After passing through the input filtering circuit, the voltage is regulated to 2V by the voltage regulator module, and then supplied to the 110GHz high-frequency photodetector after passing through the output filtering circuit. The selected voltage regulator module is the Analog Devices LT3042, an ultra-low noise linear power supply chip. Its ultra-low noise and ultra-high ripple rejection ratio (PSRR) architecture is adapted for powering RF sensitive circuits, supporting a wide input voltage range of 2.5V to 20V, thus broadening its external power supply adaptability. It features an ultra-low RMS voltage of 0.8μVrms (10Hz to 100kHz), ultra-low noise: 2nV / Hz@10kHz, ultra-high PSRR: 79dB@1MHz, and a relatively high output current of 200mA. The voltage regulator module uses output sampling for feedback compensation to achieve a more stable output state. The input and output filtering circuits adopt RC and LC filtering structures, which also have a certain energy storage function while filtering.

[0045] Fourth embodiment

[0046] Please refer to the following: Figure 1 110GHz high-frequency photodetector with reverse connection protection and electrostatic discharge protection;

[0047] This invention provides a reverse connection protection and electrostatic discharge (ESD) protection circuit for a 110GHz high-frequency photodetector. The reverse connection protection utilizes a unidirectional input transient voltage suppressor diode (TVS1) connected in parallel with the power supply port. The selected unidirectional model will preferentially break down during accidental reverse connection, thus protecting the subsequent circuitry from damage. The TVS diode possesses excellent ESD protection capabilities; this invention uses the GOODWORK SMAJ18CA, which has a peak pulse current of up to 8.3A and a breakdown voltage of 20V. It effectively releases static electricity and preferentially breaks down when the input voltage is too high, thus protecting the voltage regulator chip. The output transient voltage suppressor diode (TVS2) is connected in parallel with the 110GHz high-frequency detector's power supply interface to release static electricity introduced from the RF output port of the 110GHz high-frequency photodetector, achieving ESD protection for both input and output.

[0048] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high-frequency photodetector monitoring and driving circuit, characterized in that, include: The spectral detection and signal processing unit consists of a spectral detector, a logarithmic amplifier, and corresponding circuitry. The signal transmission and indication unit consists of an analog-to-digital converter (ADC), a microcontroller, and corresponding auxiliary circuits and interfaces. A power supply voltage regulator and power filter unit, which consists of an input filter circuit, a voltage regulator module, and an output filter circuit; The reverse connection protection and electrostatic discharge protection unit consists of an input filter circuit and an output filter circuit.

2. The high-frequency photodetector monitoring and driving circuit according to claim 1, characterized in that, The spectrophotometer has three parts: an optical input terminal, an optical output terminal, and an electrical signal pin. The optical input terminal is connected to the input signal optical interface, the optical output terminal is connected to the optical input of the 110GHz high-frequency detector, and the electrical signal pin is connected to the input of the logarithmic amplifier.

3. The high-frequency photodetector monitoring and driving circuit according to claim 1, characterized in that, The output of the logarithmic amplifier is connected to the analog input of the analog-to-digital converter, and the digital output of the analog-to-digital converter is connected to the I / O pin of the microcontroller.

4. The high-frequency photodetector monitoring and driving circuit according to claim 3, characterized in that, The communication port of the microcontroller is brought out as an external interface.

5. The high-frequency photodetector monitoring and driving circuit according to claim 1, characterized in that, The input filtering circuit is connected to the power supply input port. After filtering, the voltage enters the voltage regulator module. The regulated voltage then enters the output filtering circuit again and is connected to the power supply interface of the 110GHz high-frequency detector to provide the required low-ripple voltage. The output voltage is also connected to the status indicator light.

6. The high-frequency photodetector monitoring and driving circuit according to claim 1, characterized in that, The filtering components of the input and output filtering circuits are unidirectional transient voltage suppressor diodes (TVS).

7. The high-frequency photodetector monitoring and driving circuit according to claim 6, characterized in that, The unidirectional transient voltage suppression diode TVS includes an input transient voltage suppression diode TVS1 and an output transient voltage suppression diode TVS2.

8. The high-frequency photodetector monitoring and driving circuit according to claim 7, characterized in that, The input transient voltage suppressor diode TVS1 is connected in parallel with the power supply port, and the output transient voltage suppressor diode TVS2 is connected in parallel with the power supply interface of the 110GHz high-frequency detector.

Images