A broadband high-speed photodetector module

Abstract

This utility model discloses a broadband high-speed photodetector module, including: a housing and a driving circuit. The housing has an internal mounting cavity, a high-speed broadband response photodetector, and is fixed inside the housing via an SMA interface. An OLED display screen is embedded on the front of the housing and connected to the driving circuit via a flexible circuit board. The high-speed broadband response photodetector has a spectral response range of 800nm ​​to 1650nm, fully covering the wavelength requirements of multimode and single-mode optical fibers. It solves the limitations of traditional modules with single wavelength or narrow spectrum, significantly improves compatibility with different optical fiber systems, and is suitable for complex hybrid optical fiber network scenarios. Through the coordinated design of the cylindrical body on the side wall of the housing, the air outlet, and the heat dissipation components, the heat generated by the photodetector during operation can be quickly dissipated, avoiding performance degradation or device damage due to temperature rise, and ensuring long-term stable operation of the module under high-speed and high-load conditions.

Description

Technical Field

[0001] This utility model relates to the field of photoelectric detection technology, specifically a broadband high-speed photoelectric detector module. Background Technology

[0002] Photodetectors have the function of converting light signals into electrical signals. They have great application prospects in fields such as low light detection, fiber optic sensing systems, and space optical communication. A photodetector module is a product that integrates photodetector devices, voltage regulators, power driver boards, and function displays into one product, which is more suitable for customer applications.

[0003] Existing products are mostly single-wavelength or narrow-band spectra, which cannot cover the broadband requirements of multimode and single-mode optical fibers, resulting in poor compatibility and limited application scenarios. Therefore, we need to propose a broadband high-speed photodetector module. Utility Model Content

[0004] The purpose of this invention is to provide a broadband high-speed photodetector module that fully covers the wavelength requirements of both multimode and single-mode optical fibers, solves the limitations of traditional modules with single wavelength or narrow spectrum, significantly improves compatibility with different optical fiber systems, and is suitable for complex hybrid optical fiber network scenarios, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A broadband high-speed photodetector module includes: a housing and a driving circuit, wherein the housing has an internal mounting cavity;

[0007] A high-speed broadband response photodetector, wherein the photodetector is fixed inside the housing via an SMA interface, and the spectral response range is 800nm~1650nm;

[0008] The OLED display is embedded in the front of the housing and connected to the driving circuit via a flexible circuit board.

[0009] The gain control knob is located at the lower right corner of the front of the housing and is connected to the signal amplification module of the drive circuit via a rotary encoder.

[0010] A cylindrical body is fixedly connected to one side wall of the housing, and an air outlet is provided on one side wall of the housing. The interior of the cylindrical body is provided with a heat dissipation component for cooperating with the air outlet to cool the photodetector.

[0011] Preferably, the high-speed broadband response photodetector has a detachable structure, and its base is provided with a standardized slot to accommodate InGaAs or Si-based photodiodes of different wavelengths.

[0012] Preferably, the driving circuit includes a signal amplification module, a power management module, and an alarm control module. The signal amplification module consists of a low-noise amplifier (LNA) and a variable gain amplifier (VGA), and the power management module integrates a PD fast charging protocol chip.

[0013] Preferably, the gain adjustment range of the variable gain amplifier VGA is -6dB to +6dB, which is adjusted by the voltage divider of the rotary encoder of the gain control knob.

[0014] Preferably, the housing has an electromagnetic shielding layer inside, which is formed by copper foil attached to the inner wall of the housing.

[0015] Preferably, the heat dissipation assembly includes a fan, a protective grille, and a dustproof mesh.

[0016] The induced draft fan is fixedly installed inside the cylinder, the protective grille is located on the air inlet side of the induced draft fan, and the dustproof mesh is installed on the side of the protective grille away from the induced draft fan.

[0017] Preferably, it also includes a cleaning component for removing dust accumulated on the dustproof mesh plate. The cleaning component includes a rotating drum, which is rotatably mounted on the outer wall of the drum body. A cleaning brush plate is fixedly connected to the inner wall of the rotating drum, and the brush of the cleaning brush plate is attached to one side of the dustproof mesh plate.

[0018] Preferably, two sets of ash collection troughs are provided on the outer wall of the rotating drum.

[0019] Preferably, it also includes a Type-C power supply interface, located on the right side of the housing, which is electrically connected to the power management chip of the drive circuit;

[0020] The rechargeable battery is located on the back of the casing and is connected to the drive circuit via a lithium-ion battery protection circuit.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. The high-speed broadband response photodetector of this invention has a spectral response range of 800nm ​​to 1650nm, which fully covers the wavelength requirements of multimode fiber and single-mode fiber. It solves the limitations of traditional modules with single wavelength or narrow spectrum, significantly improves compatibility with different fiber optic systems, and is suitable for complex hybrid fiber optic network scenarios.

[0023] 2. Through the coordinated design of the shell sidewall cylinder, air outlet and heat dissipation components, the heat generated by the photodetector during operation can be quickly discharged, avoiding performance degradation or device damage caused by temperature rise, and ensuring long-term stable operation of the module under high speed and high load conditions. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the axial side structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the cylindrical body and heat dissipation assembly of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the cleaning component of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the housing and rechargeable battery of this utility model;

[0029] Figure 6 This is a schematic diagram of the photodetector and driving circuit of this utility model.

[0030] In the diagram: 1. Housing; 2. Photodetector; 3. OLED display; 4. Power switch; 5. Type-C power interface; 6. Gain control knob; 7. Drive circuit; 8. Rechargeable battery; 9. Cylinder; 10. Air outlet; 11. Heat dissipation assembly; 1101. Exhaust fan; 1102. Protective grille; 1103. Dustproof mesh; 12. Cleaning assembly; 1201. Rotary drum; 1202. Cleaning brush; 13. Dust collection trough. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figure 1-6 This utility model provides a technical solution:

[0033] A broadband high-speed photodetector module includes: a housing 1 and a driving circuit 7. The housing 1 has an internal mounting cavity. The housing 1 has dimensions of 71mm in length, 35mm in width, and 28mm in height and is made of aluminum alloy. The housing 1 has an electromagnetic shielding layer inside, which is formed by copper foil attached to the inner wall of the housing. This effectively suppresses the influence of external electromagnetic interference on the photodetector 2 and the driving circuit 7. The driving circuit 7 is fixed to the bottom of the housing 1 with screws and is electrically connected to the photodetector 2, OLED display screen 3, gain control knob 6, and other components through a flexible circuit board or high-frequency connector to ensure low signal loss and high stability in signal transmission.

[0034] The aluminum alloy material of the housing 1 not only provides lightweight characteristics, but also enhances corrosion resistance through surface anodizing treatment; the internal copper foil shielding layer is 0.1mm thick, covering all the inner walls of the cavity, and is connected to the housing grounding pin through conductive glue to form a complete shielding circuit; the PCB board of the drive circuit 7 adopts a four-layer stacked design, with the middle two layers being the power and ground planes, further reducing noise interference.

[0035] The high-speed broadband response photodetector 2 is fixed inside the housing 1 via an SMA interface. The spectral response range is 800nm ​​to 1650nm. It can be adapted to multimode fiber (850nm to 1300nm) and single-mode fiber (1310nm to 1650nm). The detector base is equipped with a standardized slot to support quick replacement of InGaAs (suitable for 1550nm band) or Si-based (suitable for 850nm band) photodiodes.

[0036] The OLED display screen 3, embedded in the front of the housing 1, is connected to the driving circuit 7 via a flexible circuit board. It displays real-time optical power, gain voltage, battery level, and alarm information. The OLED display screen 3 has a resolution of 128×64 pixels and supports customizable interface layouts. The alarm function is implemented through the MCU of the driving circuit 7. When the optical power exceeds a preset threshold (e.g., -30dBm to +10dBm) or the battery level is below 20%, the display screen triggers a red backlight warning. The encoder of the gain control knob 6 outputs a digital pulse signal, which is converted into an analog voltage by the ADC module of the driving circuit 7 to control the amplification factor of the VGA.

[0037] Gain control knob 6 is located at the lower right corner of the front of housing 1. It is connected to the signal amplification module of drive circuit 7 via a rotary encoder. Each 1° rotation of the knob corresponds to a gain adjustment of 0.1dB, with an adjustment range of -6dB to +6dB.

[0038] A cylinder 9 is fixedly connected to one side wall of the housing 1. An air outlet 10 is provided on one side wall of the housing 1. A heat dissipation component 11 is provided inside the cylinder 9 to cooperate with the air outlet 10 to cool down the photodetector 2.

[0039] The high-speed broadband response photodetector 2 has a detachable structure. Its base has a standardized slot to accommodate InGaAs or Si-based photodiodes of different wavelengths. The SMA interface uses a gold-plated contact design to ensure the reliability of high-frequency signal transmission. The slot is connected to the signal input terminal of the drive circuit 7 via a spring pin. When replacing the detector, there is no need to disassemble the housing 1. Modular replacement can be completed simply by pressing the buckle. The photosensitive surface diameter of the photodiode is designed to be 1mm, matching the fiber core diameter (50 / 125μm for multimode and 9 / 125μm for single-mode), maximizing the optical signal reception efficiency.

[0040] The driving circuit 7 includes a signal amplification module, a power management module, and an alarm control module. The signal amplification module consists of a low-noise amplifier (LNA) and a variable gain amplifier (VGA). The power management module integrates a PD fast charging protocol chip.

[0041] The gain adjustment range of the variable gain amplifier VGA is -6dB to +6dB, which is adjusted by the rotary encoder voltage divider of the gain control knob 6.

[0042] The heat dissipation assembly 11 includes a fan 1101, a protective grille 1102, and a dustproof mesh 1103;

[0043] The induced draft fan 1101 is fixedly installed inside the cylinder 9. The protective grid 1102 is located on the air inlet side of the induced draft fan 1101. The dustproof mesh plate 1103 is installed on the side of the protective grid 1102 away from the induced draft fan 1101. The induced draft fan 1101 is driven by a brushless motor.

[0044] It also includes a cleaning component 12 for removing dust accumulated on the dustproof mesh 1103. The cleaning component 12 includes a rotating drum 1201, which is rotatably mounted on the outer wall of the drum body 9. A cleaning brush plate 1202 is fixedly connected to the inner wall of the rotating drum 1201. The brush of the cleaning brush plate 1202 is attached to one side of the dustproof mesh 1103. Two sets of dust collection troughs 13 are provided on the outer wall of the rotating drum 1201, and the dust is discharged through the dust collection troughs 13.

[0045] It also includes a Type-C power interface 5, located on the right side of the housing 1, which is electrically connected to the power management chip of the drive circuit 7. The Type-C power interface 5 integrates a USB PD3.0 protocol chip, supports 5V / 3A to 20V / 1.5A input, and automatically switches to power supply mode when an external power source is connected, and charges the rechargeable battery 8. The rechargeable battery 8 is a lithium polymer battery with a capacity of 3000mAh and an operating voltage of 3.7V. It is protected against overcharge, over-discharge and short circuit through a protection circuit, and has an independent power supply life of ≥24 hours.

[0046] The rechargeable battery 8 is located on the back of the housing 1 and is connected to the drive circuit 7 via a lithium-ion battery protection circuit. The power management module uses a bidirectional DC-DC converter, prioritizing battery charging when powered externally, with a charging efficiency of ≥90%. When the battery is discharging, the MCU of the drive circuit 7 monitors the battery level in real time and displays the percentage on the OLED display 3. The metal casing of the Type-C interface 5 shares a common ground with the housing 1 to avoid electrostatic interference.

[0047] Incident light is input to photodetector 2 via optical fiber. The photosensitive element (InGaAs / Si) converts the optical signal into a weak current signal, which is transmitted to the low-noise amplifier (LNA) of the drive circuit 7 via the SMA interface for initial amplification. The amplified signal enters the variable gain amplifier (VGA). The user can adjust the output amplitude (-6dB to +6dB) by rotating the gain control knob 6. Finally, the signal is processed by the drive circuit 7 and output to external devices. The external power supply powers the module through the Type-C interface 5 or is powered independently by the rechargeable battery 8. The power management module automatically switches the power supply mode. When the exhaust fan 1101 is running, the external cold air flows into the housing 1 after being filtered by the dust filter 1103, carrying away the heat from the photodetector 2 and the drive circuit 7, and is discharged through the air outlet 10. The OLED display screen 3 displays the optical power, gain voltage and battery status in real time. The cleaning brush 1202 can be rotated by manually rotating the rotating drum 1201, thereby cleaning the dust accumulated on the dust filter 1103.

[0048] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A broadband high-speed photodetector module, characterized in that, include: The housing (1) and the drive circuit (7) are provided with an installation cavity inside the housing (1); A high-speed broadband response photodetector (2) is fixed inside the housing (1) via an SMA interface, and has a spectral response range of 800 nm to 1650 nm. An OLED display (3) is embedded in the front of the housing (1) and connected to the driving circuit (7) via a flexible circuit board; Gain control knob (6) is located at the lower right corner of the front of housing (1) and is connected to the signal amplification module of drive circuit (7) via rotary encoder; A cylindrical body (9) is fixedly connected to one side wall of the housing (1), and an air outlet (10) is provided on one side wall of the housing (1). A heat dissipation component (11) is provided inside the cylindrical body (9) to cooperate with the air outlet (10) to cool down the photodetector (2).

2. A wide spectrum high speed photodetector module according to claim 1, characterized in that: The high-speed broadband response photodetector (2) has a detachable structure, and its base is equipped with a standardized slot to accommodate InGaAs or Si-based photodiodes of different wavelengths.

3. A wide spectrum high speed photodetector module according to claim 1, characterized in that: The driving circuit (7) includes a signal amplification module, a power management module and an alarm control module. The signal amplification module consists of a low-noise amplifier (LNA) and a variable gain amplifier (VGA). The power management module integrates a PD fast charging protocol chip.

4. A wide spectrum high speed photodetector module according to claim 3, characterized in that: The gain adjustment range of the variable gain amplifier (VGA) is -6dB to +6dB, which is adjusted by the rotary encoder voltage divider of the gain control knob (6).

5. A wide spectrum high speed photodetector module according to claim 1, characterized in that: The housing (1) is provided with an electromagnetic shielding layer inside, which is composed of copper foil attached to the inner wall of the housing.

6. A wide spectrum high speed photodetector module according to claim 1, characterized in that: The heat dissipation assembly (11) includes a fan (1101), a protective grille (1102), and a dustproof mesh plate (1103); The induced draft fan (1101) is fixedly installed inside the cylinder (9), the protective grille (1102) is located on the air inlet side of the induced draft fan (1101), and the dustproof mesh plate (1103) is installed on the side of the protective grille (1102) away from the induced draft fan (1101).

7. A wide spectrum high speed photodetector module according to claim 1, characterized in that: It also includes a cleaning assembly (12) for removing dust accumulated on the dust screen (1103), the cleaning assembly (12) including a rotating drum (1201) rotatably mounted on the outer wall of the cylinder (9), and a cleaning brush plate (1202) fixedly connected to the inner wall of the rotating drum (1201), the brush of the cleaning brush plate (1202) being attached to one side of the dust screen (1103).

8. A wide spectrum high speed photodetector module according to claim 7, characterized in that: Two sets of ash drop troughs (13) are provided on the outer wall of the rotating drum (1201).

9. A broadband high-speed photodetector module according to claim 1, characterized in that: It also includes a Type-C power supply interface (5), located on the right side of the housing (1), which is electrically connected to the power management chip of the drive circuit (7); A rechargeable battery (8) is located on the back of the housing (1) and is connected to the drive circuit (7) through a lithium-ion battery protection circuit.

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