An optical receiver and fiber optic module

Abstract

The embodiment of the present application provides a kind of optical receiver and optical fiber module, it is related to photoelectric technology field, for solving the problem that high bandwidth optical receiver made of photoelectric diode often appears signal loss.This application provides an optical receiver, including photoelectric diode, transimpedance amplifier and regulator.Transimpedance amplifier input and photoelectric diode output are electrically connected, and the response rate of transimpedance amplifier is greater than the response rate of photoelectric diode;Regulator is used to make transimpedance amplifier in low frequency overshoot state.The optical receiver provided by the embodiment of the present application is used to receive optical signal, and converts optical signal into electrical signal.

Description

Technical Field

[0001] This application relates to the field of optoelectronic technology, and in particular to an optical receiver and an optical fiber module. Background Technology

[0002] Optical receivers are used to convert optical signals into electrical signals, and include vacuum phototubes, photomultiplier tubes, photoresistors, phototransistors, and photodiodes. Among them, photodiodes are widely used in industrial control, laser ranging, and fiber optic communication technologies due to their advantages such as small size, fast response, high reliability, and low noise. Photodiodes receive optical signals and convert them into weak electrical signals. In practical operation, they are generally connected to a preamplifier, such as a transimpedance amplifier, to amplify the electrical signal output by the photodiode for subsequent processing.

[0003] With the continuous development of optoelectronic technology, especially optical communication technology, people's demand for data traffic is increasing, the transmission rate of optical signals is also increasing, and the bandwidth of optical receivers is also increasing. However, in practical applications, high-bandwidth optical receivers made using photodiodes often experience signal loss problems. Summary of the Invention

[0004] Therefore, embodiments of this application provide an optical receiver and an optical fiber module to solve the problem of signal loss that often occurs in high-bandwidth optical receivers made using photodiodes.

[0005] To achieve the above objectives, a first aspect of this application provides an optical receiver, including a photodiode, a transimpedance amplifier, and a regulator. The input terminal of the transimpedance amplifier is electrically connected to the output terminal of the photodiode, and the response rate of the transimpedance amplifier is greater than that of the photodiode. The regulator is used to keep the transimpedance amplifier in a low-frequency overshoot state.

[0006] Furthermore, the diameter of the photosensitive surface of the photodiode is greater than 30 μm.

[0007] Furthermore, the regulator is an equalizer, which is electrically connected to the transimpedance amplifier. The equalizer is used to increase the intensity of the low-frequency signal in the output signal of the transimpedance amplifier.

[0008] Furthermore, the frequency of the low-frequency signal output by the transimpedance amplifier is no greater than 1 GHz.

[0009] Furthermore, the photodiode is a 10G PD, and the transimpedance amplifier is a 25G TIA.

[0010] A second aspect of this application provides an optical fiber module, including the optical receiver provided in the first aspect of this application.

[0011] Furthermore, the optical receiver also includes a transistor outline package structure, on which the optical receiver is packaged; the optical fiber module also includes a base, on which the transistor outline package structure is fixed, and the relative position of the base and the transmission path of the incident light beam is fixed so that the incident light beam illuminates the photosensitive surface of the photodiode.

[0012] Furthermore, the transistor's outer packaging structure is fixed to the base via an adhesive layer.

[0013] Furthermore, the fiber optic module is a single-fiber bidirectional fiber optic module.

[0014] The optical receiver provided in this application embodiment utilizes a photodiode with a relatively small response rate and a large photosensitive surface area. This photosensitive surface can effectively receive optical signals and is less prone to light loss due to light dropout. When this photodiode is paired with a transimpedance amplifier that has a large response rate and operates in a low-frequency overshoot state, the transimpedance amplifier can compensate for the insufficient response rate of the photodiode. The resulting optical receiver has a large bandwidth and does not experience bit errors during signal reception, thus meeting the requirements for normal optical signal reception. Therefore, the optical receiver provided in this application embodiment can balance bandwidth and photosensitive surface size, thereby solving the problem of signal loss that often occurs in high-bandwidth optical receivers made using photodiodes.

[0015] Furthermore, photodiodes with lower response rates are less expensive. Compared to existing optical receivers made of photodiodes with the same response rate and transimpedance amplifiers, the optical receiver provided in this application is similar to overclocking a photodiode with a lower response rate. Given the same optical receiver bandwidth, the optical receiver provided in this application also has a significant cost advantage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an optical receiver in one embodiment of this application;

[0017] Figure 2 This is a bandwidth curve of an optical receiver formed by combining a 25G PD with a 25G TIA without low-frequency overshoot.

[0018] Figure 3 This is a bandwidth curve of an optical receiver formed by combining a 25G PD with a low-frequency overshoot 25G TIA.

[0019] Figure 4 This is a bandwidth curve of an optical receiver formed by combining a 10G PD with a low-frequency overshoot 25G TIA.

[0020] Figure 5 This is a schematic diagram of the structure of a single-fiber bidirectional optical fiber module in one embodiment of this application.

[0021] Figure label:

[0022] 1-Photodiode; 11-Photosensitive surface; 2-Transimpedance amplifier; 3-Transistor package structure; 31-Focusing lens; 4-Base; 41-Filter; 5-Adhesive layer; 6-Transistor packaged laser; 7-Sealed tube body; 8-Electrically isolated pin. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0024] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0025] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0026] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0027] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0028] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0029] With the continuous development of optoelectronic technology, especially optical communication technology, people's demand for data traffic is increasing, the transmission rate of optical signals is also increasing, and the bandwidth of optical receivers is also increasing. However, in practical applications, high-bandwidth optical receivers made using photodiodes often experience signal loss problems.

[0030] As part of the inventive step of this application, the following analysis addresses the reasons why high-bandwidth optical receivers frequently experience signal loss:

[0031] The bandwidth of an optical receiver is closely related to the response rate of a photodiode. The bandwidth of an optical receiver refers to the frequency range of optical signals it can process. A higher photodiode response rate allows it to handle a wider frequency range of optical signals, resulting in a larger bandwidth. However, the junction capacitance of a photodiode decreases as its response rate increases, consequently reducing the area of ​​its photosensitive surface. During operation, the incident light beam carrying the information (the optical signal) illuminates the photosensitive surface. The reduced surface area makes the photosensitive surface more sensitive to the position of the incident light beam along its transmission path, leading to light loss and signal drop.

[0032] Specifically, during the service life of an optical receiver, the connection points of its various components are weak points. These connections may loosen due to factors such as processing, prolonged service time, and external environmental influences. This can cause a relative displacement between the transmission path of the incident beam and the photosensitive surface. For photodiodes with lower response rates, the photosensitive surface is larger, with a diameter reaching 30µm or even 50µm or more. Even if there is a certain relative displacement between the transmission path of the incident beam and the photosensitive surface, the coupled spot of the incident beam will still remain within the range of the photosensitive surface, not affecting the optical receiver's reception of the optical signal. However, for photodiodes with higher response rates, the diameter of the photosensitive surface is less than 20µm. A relative displacement between the transmission path of the incident beam and the photosensitive surface can easily cause the coupled spot of the incident beam to leave the range of the photosensitive surface, resulting in the optical receiver failing to receive the optical signal, causing a loss of light.

[0033] Therefore, please refer to Figure 1This application provides an optical receiver that can balance bandwidth and the size of the photosensitive surface 11. High-bandwidth optical receivers made using photodiodes 1 often suffer from signal loss.

[0034] It should be noted that the optical receiver provided in this application embodiment can be any device used to receive optical signals, and there is no limitation herein. Exemplarily, in some embodiments, the optical receiver can be a photodetector such as a laser detector, etc. The photodetector can be a photodetector applied in various technical fields, and there is no limitation herein. For example, it can be a photodetector applied in technical fields such as radiation measurement and detection, industrial automatic control, photometry, missile guidance, thermal imaging, or remote sensing; the optical receiver can also be a light energy converter such as a solar cell; the optical receiver can also be an optical receiver used to receive optical signals in optical fibers in the field of optical fiber communication technology, etc.

[0035] Please refer to the optical receiver provided in this application embodiment. Figure 1 The optical receiver includes a photodiode 1, a transimpedance amplifier 2, and a regulator. The input terminal of the transimpedance amplifier 2 is electrically connected to the output terminal of the photodiode 1, and the response rate of the transimpedance amplifier 2 is greater than that of the photodiode 1. The regulator is used to keep the transimpedance amplifier 2 in a low-frequency overshoot state.

[0036] It should be noted that the type of photodiode 1 is not limited; it can be a PN photodiode (silicon photodiode), a PIN photodiode, an APD photodiode (avalanche photodiode), a GaAsP (gallium arsenide phosphide) photodiode, or a composite photodiode (position detection photodiode), etc. Among these, the main characteristics of a PN photodiode are high sensitivity to a wide range of wavelengths from ultraviolet to infrared, good linearity between its photocurrent and incident light intensity, and high sensitivity to weak light, but its response speed is slower than that of a PIN photodiode. The advantage of a PIN photodiode is its fast response speed, but its temperature characteristics are worse than those of a PN photodiode. The main characteristics of an APD are high sensitivity to a wide range of wavelengths of light, amplification of photocurrent, low dark current, and fast response speed. GaAsP photodiodes have wavelengths close to visible light and are generally used in visible light applications, primarily as dew point meters and spectrophotometers in cameras. Composite photodiodes are characterized by their alignment with the optical axis of the incident light and are used for photoelectric position detection.

[0037] It should be noted that, generally, the signal strength of the output signal of an optical receiver decreases as the frequency increases. However, assuming the transimpedance amplifier and photodiode have the same response rate, if the transimpedance amplifier is in a low-frequency overshoot state, the signal strength of its output signal will increase with increasing frequency in the low-frequency range. It should be noted that the starting value of the aforementioned low-frequency range is the minimum frequency of the transimpedance amplifier's output signal. Generally, the ending value of this low-frequency range is less than 1 GHz. A transimpedance amplifier in a low-frequency overshoot state is defined as follows: When the transimpedance amplifier and photodiode have the same response rate, a transimpedance amplifier whose output signal strength increases with increasing frequency in the low-frequency range is considered to have a low-frequency overshoot.

[0038] As part of the inventive concept of this application, the inventive concept of the optical receiver provided in the embodiments of this application is described below.

[0039] Comparative Example 1 provides an optical receiver in which the response rate of photodiode 1 is the same as the response rate of transimpedance amplifier 2. Optical receivers in the prior art are typically in this form, for example, a combination of a 1.25G PD (Photo-Diode) and a 1.25G TIA (trans-impedance amplifier) ​​to form an optical receiver, a combination of a 4.25G PD and a 4.25G TIA to form an optical receiver, a combination of a 10G PD and a 10G TIA to form an optical receiver, or a combination of a 25G PD and a 25G TIA to form an optical receiver, etc. The photosensitive surface 11 of the 10G PD and 10G TIA combination optical receiver is larger, but the bandwidth is smaller, with a -3dB bandwidth typically only around 8GHz. The photosensitive surface 11 of the 25G PD and 25G TIA combination optical receiver is smaller, but the bandwidth is larger, with a -3dB bandwidth reaching over 12GHz. Please refer to [reference needed]. Figure 2 , Figure 2 This is a bandwidth curve of an optical receiver formed by combining a 25G PD with a 25G TIA without low-frequency overshoot. It should be noted that on curve A, to the right of point a1, the x-coordinate of the first point whose ordinate is less than that of a1 and differs from a1 by 3 dB represents the -3 dB bandwidth of this optical receiver. Point a2 differs from point a1 by 3 dB in ordinate, and the x-coordinate of point a1 is greater than 12 GHz, indicating that the -3 dB bandwidth of this optical receiver is greater than 12 GHz.

[0040] It should be noted that the above-mentioned combination of photodiode 1 and transimpedance amplifier 2 to form an optical receiver refers to the electrical connection between the output terminal of photodiode 1 and the input terminal of transimpedance amplifier 2 to form an optical receiver. For example, the combination of 10G PD and 10G TIA to form an optical receiver means that the output terminal of 10G PD and the input terminal of 10G TIA are electrically connected to form an optical receiver. The combination of 25G PD and 25G TIA to form an optical receiver means that the output terminal of 25G PD and the input terminal of 25G TIA are electrically connected to form an optical receiver.

[0041] To balance bandwidth and photosensitive surface 11 size in the optical receiver, and to address the issue of signal loss common in high-bandwidth optical receivers, Comparative Example 2 provides an optical receiver where the response rate of photodiode 1 is the same as that of transimpedance amplifier 2. Furthermore, this optical receiver includes a regulator to keep the transimpedance amplifier in a low-frequency overshoot state. Thus, based on Comparative Example 1, keeping the transimpedance amplifier 2 in a low-frequency overshoot state increases the bandwidth of the optical receiver without reducing the size of the photosensitive surface 11 of photodiode 1. However, this also increases the bit error rate during signal reception.

[0042] For example, based on Comparative Example 2, photodiode 1 is a 25G PD, transimpedance amplifier 2 is a 25G TIA, and transimpedance amplifier 2 is in a low-frequency overshoot state. Please refer to... Figure 3 , Figure 3 This is a bandwidth curve of an optical receiver formed by combining a 25G PD with a low-frequency overshoot 25G TIA. The vertical coordinates of points b2 and b1 differ by 3 dB, and the horizontal coordinate of point b1 is greater than 25 GHz, indicating that this optical receiver has a bandwidth greater than 25 GHz (-3 dB). However, along the positive horizontal axis, curve B first rises and then falls. It should be noted that along the positive horizontal axis, to the left of point b1, the bandwidth curve shows an upward trend, indicating that this optical receiver generates significant bit errors during signal reception, failing to meet the requirements for receiving optical signals.

[0043] To address the issue of signal loss in high-bandwidth optical receivers by balancing bandwidth and photosensitive surface 11 size, Comparative Example 3 provides an optical receiver where the response rate of photodiode 1 is lower than that of transimpedance amplifier 2. Essentially, based on Comparative Example 1, the photodiode 1 with a larger response rate is replaced with a photodiode 1 with a smaller response rate. While the photodiode 1 with a smaller response rate has a larger photosensitive surface 11, it also reduces the bandwidth of the optical receiver. It should be noted that the smaller response rate of transimpedance amplifier 2 is relative to its overall response rate; the larger response rate of photodiode 1 is the same as that of transimpedance amplifier 2.

[0044] For example, based on Comparative Example 3, photodiode 1 is a 25G PD, transimpedance amplifier 2 is a 25G TIA, and transimpedance amplifier 2 is in a low-frequency overshoot state. The optical receiver has a -3dB bandwidth of about 8GHz, which is relatively small and cannot meet the requirements for receiving high-frequency optical signals.

[0045] However, by combining Comparative Example 2 and Comparative Example 3, a light receiver that balances bandwidth and the size of the photosensitive surface 11 can be obtained. Specifically, this light receiver is the one provided in the embodiments of this application, where the response rate of the transimpedance amplifier 2 is greater than that of the photodiode 1, and the transimpedance amplifier 2 is in a low-frequency overshoot state. Thus, based on Comparative Example 2, replacing the photodiode 1 with a smaller response rate increases the photosensitive surface 11 of the photodiode 1 and also alleviates the bit error problem caused by the low-frequency overshoot of the transimpedance amplifier 2. It should be noted that the smaller response rate of the transimpedance amplifier 2 is relative to the response rate of the photodiode 1; the larger response rate of the photodiode 1 is the same as that of the transimpedance amplifier 2.

[0046] For example, in one embodiment of this application, photodiode 1 is a 25G PD, transimpedance amplifier 2 is a 25GTIA, and transimpedance amplifier 2 is in a low-frequency overshoot state. Please refer to... Figure 4 , Figure 4 This is a bandwidth curve of an optical receiver formed by combining a 10G PD with a 25G TIA with low-frequency overshoot. The vertical axis of point c2 differs from that of point c1 by 3 dB, and the horizontal axis of point c2 is greater than 12 GHz. Compared to a traditional optical receiver formed by combining a 10G PD with a 10G TIA without low-frequency overshoot, this optical receiver has a larger -3 dB bandwidth. Furthermore, along the positive horizontal axis, before point c2, curve C shows no upward trend, indicating that this optical receiver does not generate significant bit errors during optical signal reception and can meet the requirements for receiving high-frequency optical signals.

[0047] Therefore, in the optical receiver provided in this embodiment, the photodiode 1 has a relatively small response rate, and the photosensitive surface 11 of the photodiode 1 has a large area. The photosensitive surface 11 can receive optical signals well and is less prone to light loss. When the photodiode 1 is used in conjunction with a transimpedance amplifier 2 with a large response rate and in a low-frequency overshoot state, the transimpedance amplifier 2 can compensate for the insufficient response rate of the photodiode 1. The resulting optical receiver has a large bandwidth and does not experience bit errors during signal reception, thus meeting the requirements for normal optical signal reception. Therefore, the optical receiver provided in this embodiment can balance bandwidth and the size of the photosensitive surface 11, thereby solving the problem of signal loss that often occurs in high-bandwidth optical receivers made using photodiode 1.

[0048] Furthermore, the photodiode 1 with a smaller response rate has a lower cost. Compared to existing optical receivers made of a photodiode 1 with the same response rate and a transimpedance amplifier 2, the optical receiver provided in this application embodiment is similar to overclocking the photodiode 1 with a smaller response rate. Under the condition that the optical receiver bandwidth is the same, the optical receiver provided in this application embodiment also has a significant cost advantage.

[0049] It should be noted that the response rate of photodiode 1 is less than that of transimpedance amplifier 2; that is, photodiode 1 is mGPD and transimpedance amplifier 2 is nGTIA, where m is less than n. For example, in some embodiments, m is 1.25 and n is 4.25; it can also be m is 10 and n is 25; or it can be m is 25 and n is 28, 40, or 50, etc.

[0050] Preferably, in some embodiments, photodiode 1 is a 10G PD and transimpedance amplifier 2 is a 25G TIA. This way, the photosensitive surface 11 of the 10G PD is greater than 30μm, enabling better reception of optical signals. The difference in response rate between the 25G TIA and the 10G PD is within a reasonable range and not too large, facilitating adjustment of the transimpedance amplifier 2 by operators, ensuring it operates in a low-frequency overshoot state. The 3dB bandwidth of this optical receiver reaches over 12GHz. Moreover, experiments have shown that the sensitivity difference between this optical receiver and a traditional optical receiver formed by combining 25G TIA and 25G PD is within 1dB, indicating that this optical receiver can effectively perform the task of receiving high-frequency optical signals. Of course, in other embodiments, photodiode 1 can be a 10G PD and transimpedance amplifier 2 can be a 28G TIA; or photodiode 1 can be a 25G PD and transimpedance amplifier 2 can be a 40G TIA, etc.

[0051] Preferably, in some embodiments, the diameter of the photosensitive surface 11 of the photodiode 1 is greater than 30 μm. This results in a larger photosensitive surface 11, which allows for better reception of optical signals and helps avoid light loss issues. It should be noted that there is an angle between the plane containing the photosensitive surface 11 and the transmission path of the incident light beam illuminating the photosensitive surface. Preferably, in some embodiments, the plane containing the photosensitive surface 11 is perpendicular to the transmission path of the incident light beam illuminating the photosensitive surface.

[0052] In some embodiments, the regulator is an equalizer, which is electrically connected to the transimpedance amplifier 2. The equalizer is used to increase the intensity of the low-frequency signal of the output signal of the transimpedance amplifier 2. Furthermore, preferably in some embodiments, the frequency of the low-frequency signal of the output signal of the transimpedance amplifier 2 is no greater than 1 GHz.

[0053] In some embodiments, please refer to Figure 1 The optical receiver also includes a transistor outline package structure 3, on which the optical receiver is packaged. In this structure, the photodiode 1 and the transimpedance amplifier 2 are packaged on the transistor outline package structure 3 to form a PD TO (PhotoDiode TransistorOutline). Based on this, in some embodiments, a focusing lens 31 is provided on the transistor outline package structure 3, and the incident light beam is focused onto the photosensitive surface 11 by the focusing lens 31.

[0054] The second aspect of this application provides an optical fiber module, please refer to... Figure 5 This includes the optical receiver provided in the first aspect of the embodiments of this application. The optical fiber module is used to convert optical signals in the optical fiber into electrical signals, or to convert electrical signals into optical signals for transmission into the optical fiber. The conversion of optical signals in the optical fiber into electrical signals is achieved by the optical receiver provided in the embodiments of this application, while the conversion of electrical signals into optical signals is generally achieved by components such as lasers or light-emitting diodes. The optical fiber module made from the optical receiver provided in the embodiments of this application has a large bandwidth, and the photosensitive surface 11 of the photodiode 1 is large, enabling it to stably receive the incident light beam in the optical fiber and reducing the likelihood of light dropout leading to signal loss.

[0055] In some embodiments, please continue to refer to Figure 5The optical receiver also includes a transistor outline package (TEP) 3, on which the optical receiver is packaged. The fiber optic module also includes a base 4, on which the TEP 3 is fixed. The relative position of the base 4 and the transmission path of the incident light beam is fixed so that the incident light beam illuminates the photosensitive surface 11 of the photodiode 1. In this structure, the optical receiver is packaged on the TEP 3, forming a PD TO (PhotoDiode TransistorOutline). The PD TO is fixed on the base 4. The connection between the PD TO and the base 4 is a weak point and is prone to loosening, causing relative displacement between the photosensitive surface 11 and the transmission path of the incident light beam. If the photosensitive surface 11 is small, the relative displacement between the photosensitive surface 11 and the transmission path of the incident light beam can easily cause the incident light beam to shine outside the photosensitive surface 11, i.e., light loss. However, the optical receiver provided in this embodiment has a larger photosensitive surface 11, which can better alleviate the signal loss problem caused by the loose connection between the PD TO and the base 4.

[0056] There are various ways to fix the transistor package structure 3 to the base 4. For example, in some embodiments, the transistor package structure 3 and the base 4 are welded together. Furthermore, in some embodiments, the welding connection can be laser welding, brazing, high-frequency welding, resistance welding, electron beam welding, or plasma arc welding, etc. For other embodiments, please refer to... Figure 5 The transistor package structure 3 and the base 4 can also be fixed by an adhesive layer 5. The adhesive layer 5 is easy to process, has low cost, and is widely used. However, the incident light beam in the optical fiber has a certain temperature. Under the irradiation and baking of the incident light beam, the adhesive layer 5 is prone to softening. Compared with soldering, the fixing effect of the adhesive layer 5 is poor, and the relative position of the transistor package structure 3 and the base 4 is more likely to change. In this case, the advantage of a larger photosensitive surface 11 becomes apparent. The larger size of the photosensitive surface 11 can better alleviate the light loss problem caused by changes in the relative position of the transistor package structure 3 and the base 4.

[0057] Preferably, in some embodiments, the adhesive layer 5 is made of photosensitive adhesive. Photosensitive adhesive, also known as UV-curable adhesive, is more efficient, energy-saving, and environmentally friendly than traditional adhesives, and its product performance is superior. With the increasing awareness of energy conservation and environmental protection among the public, the application of photosensitive adhesive is becoming more and more widespread.

[0058] It should be noted that there are no restrictions on the type of fiber optic module; for example, it can be a single-fiber unidirectional fiber optic module, a single-fiber bidirectional fiber optic module, or a single-wire tridirectional fiber optic module. Currently, single-fiber unidirectional and single-fiber bidirectional fiber optic modules are relatively mature, while single-fiber tridirectional fiber optic modules are continuously being improved and developed.

[0059] This system transmits and receives optical signals in two directions via two optical fibers. One fiber carries the optical signal received by a receiver, while the other transmits the optical signals emitted by components such as lasers or light-emitting diodes within the single-fiber unidirectional fiber module. The single-fiber unidirectional fiber module has a simple structure, with different wavelengths of optical signals transmitted separately in the two fibers. It is relatively easy to manufacture and has a low cost.

[0060] Single-fiber bidirectional fiber optic modules can transmit and receive optical signals in both directions using only a single fiber. This means the optical signal received by the receiver is transmitted in the same fiber as the optical signal emitted by a laser or LED, significantly saving fiber resources, reducing costs, and conserving materials. To achieve this, different wavelengths are needed for transmission and reception. The filter within the fiber optic module filters the optical signal to allow for the transmission of one wavelength and the reception of the other. For example, a laser or LED might emit a 1310nm optical signal, while the receiver receives a 1550nm signal. Typically, single-fiber bidirectional fiber optic modules are used in pairs, with opposite wavelengths. In other words, the wavelength of the optical signal received by the receiver in one module is the same as the wavelength of the optical signal emitted by the laser or LED in the other module.

[0061] Preferably, in some embodiments, the fiber optic module is a single-fiber bidirectional fiber optic module. Based on this, in some embodiments, please continue to refer to... Figure 5 The single-wire bidirectional module also includes a laser diode (LDTO) in a transistor outline package (TEP), a soldered tube 7, and an electrically isolated ferrule 8. The LDTO is fixed to the base 4 via the soldered tube 7, and the electrically isolated ferrule 8 is also fixed to the base 4. A filter 41 is disposed within the base 4. The LDTO converts electrical signals into optical signals. The optical signals are coupled into the electrically isolated ferrule 8 through the filter 41. The electrically isolated ferrule 8 is fixed to the optical fiber, allowing the optical signals emitted by the LDTO to enter the optical fiber for transmission through the electrically isolated ferrule 8. The incident light beam in the optical fiber also enters the single-wire bidirectional fiber module through the electrically isolated ferrule 8 and is then reflected onto the photosensitive surface 11 by the filter 41.

[0062] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An optical receiver, characterized in that, include: Photodiode; A transimpedance amplifier, wherein the input terminal of the transimpedance amplifier is electrically connected to the output terminal of the photodiode, and the response rate of the transimpedance amplifier is greater than the response rate of the photodiode; A regulator is provided to ensure that, in the low-frequency range, the signal strength of the output signal of the transimpedance amplifier increases with increasing frequency, provided that the response rates of the transimpedance amplifier and the photodiode are the same.

2. The optical receiver according to claim 1, characterized in that, The diameter of the photosensitive surface of the photodiode is not less than 30 μm.

3. The optical receiver according to claim 1, characterized in that, The regulator is an equalizer, which is electrically connected to the transimpedance amplifier. The equalizer is used to increase the intensity of the low-frequency signal of the output signal of the transimpedance amplifier.

4. The optical receiver according to claim 2, characterized in that, The frequency of the low-frequency signal output by the transimpedance amplifier is no greater than 1 GHz.

5. The optical receiver according to claim 1, characterized in that, The photodiode is a 10G PD, and the transimpedance amplifier is a 25G TIA.

6. An optical fiber module, characterized in that, Includes the optical receiver according to any one of claims 1 to 5.

7. The optical fiber module according to claim 6, characterized in that, The optical receiver further includes a transistor outline package structure, and the optical receiver is packaged on the transistor outline package structure; the optical fiber module further includes a base, the transistor outline package structure is fixed to the base, and the relative position of the base and the transmission path of the incident light beam is fixed so that the incident light beam irradiates the photosensitive surface of the photodiode.

8. The optical fiber module according to claim 7, characterized in that, The transistor's outer packaging structure is fixed to the base by an adhesive layer.

9. The optical fiber module according to any one of claims 6 to 8, characterized in that, The optical fiber module is a single-fiber bidirectional optical fiber module.

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