Optical transmitter module and optical module

Abstract

This invention discloses an optical emitting module and an optical module. The optical emitting module includes a light source driving circuit and an emitting optical component. The emitting optical component is driven by the light source driving circuit to emit an optical signal. The light source driving circuit includes: an output voltage control circuit for adjusting and controlling the output voltage; an adjustable current source circuit for receiving the voltage output by the output voltage control circuit and outputting a light source driving current for the optical device in the emitting optical component; and a switching modulation circuit for receiving a pulse electrical signal and the current output by the adjustable current source circuit, for modulating the emitted optical signal of the optical device. The optical emitting module of this application can achieve controllable and adjustable light source driving current. It can compensate for the temperature characteristics of the light source by adjusting the light source driving current within a wide temperature range, enabling reliable use of the optical emitting module in a wide temperature range environment. Furthermore, after light source temperature characteristic compensation, the signal transmission accuracy is improved.

Description

Technical Field

[0001] This invention belongs to the field of optical fiber communication technology, specifically relating to an optical transmitting module and an optical module. Background Technology

[0002] Optical communication modules (or simply optical modules) are finding increasingly wider applications, with more and more specialized devices and systems using optical fibers for signal transmission. Currently, not only high-speed data transmission (such as switches and high-speed digital boards) uses optical fibers, but also low-speed control signals (such as control signals and bus signals in aircraft systems), including buses (such as CAN bus and RS2 / RS485 bus), are also transmitted using optical fibers.

[0003] In high-reliability applications, such as aircraft engine control signals, fiber optic transmission is also required. This field is characterized by high temperatures and high vibrations, demanding high reliability and low-speed control signal transmission. The control signal rate is relatively low (e.g., DC to 2 Mbps, where DC refers to an infinitely low frequency, down to direct current). Furthermore, in these high-reliability applications, a wide operating temperature range (e.g., -55°C to 125°C) and ultra-low frequencies (e.g., frequencies down to direct current) are also required.

[0004] Traditional optical modules are designed for high-speed data transmission and cannot meet the low-frequency application requirements of industrial control signals. Furthermore, the optoelectronic components available on the market for industrial control applications do not meet the requirements for applications with wide temperature ranges and high vibration.

[0005] In addition, its circuit is simple, with only a light source at the transmitter and only a phototransistor at the receiver. This type of module requires an external driver to complete the photoelectric transmission function. It does not have the ability to adapt to a wide temperature range, and the light source's luminous characteristics change drastically with temperature. Therefore, it is necessary to solve the problem of luminous power control at high temperatures. Summary of the Invention

[0006] In response to the problems pointed out in the background art, one of the objectives of this application is to provide a light emitting module that can realize the controllability and adjustability of the light source driving current, and achieve the compensation of the light source temperature characteristics by adjusting the light source driving current in a wide temperature range, so as to realize the reliable use of the light emitting module in a wide temperature range scenario, and improve the signal transmission accuracy after the light source temperature characteristics are compensated.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A light emitting module includes a light source driving circuit and a light emitting component, wherein the light emitting component is driven by the light source driving circuit to emit light signals, and the light source driving circuit includes:

[0009] Output voltage control circuit, which is used to regulate and control the output voltage;

[0010] An adjustable current source circuit receives the voltage output by the output voltage control circuit and outputs a light source driving current for the optical devices in the emitting light assembly.

[0011] A switching modulation circuit receives pulse electrical signals and the current output by the adjustable current source circuit, and is used to modulate the optical signal emitted by the optical device.

[0012] In some embodiments of this application, the output voltage control circuit includes:

[0013] Control unit, which is used to control the output digital signal representing voltage;

[0014] A digital-to-analog converter unit is used to convert the digital signal into an analog signal, wherein the analog signal is the voltage output by the output voltage control circuit.

[0015] In some embodiments of this application, the adjustable current source circuit includes:

[0016] The current regulation circuit includes a first control switch and a second control switch connected in series on the main line, and the control terminal of the first control switch is connected to its output terminal.

[0017] An amplifier has one input terminal receiving the voltage output by the output voltage control circuit, another input terminal receiving the feedback voltage of the current regulation circuit, and its output terminal connected to the control terminal of the second control switch. The current regulation circuit regulates the current flowing through the current regulation circuit according to the voltage output by the amplifier's output terminal.

[0018] A current source includes multiple controllable switches connected in parallel. The control terminals of the multiple controllable switches are respectively connected to the control terminal of the first control switch. The sum of the currents flowing through each controllable switch is output by the current source as the light source driving current output by the adjustable current source circuit.

[0019] The first controllable switch and the plurality of controllable switches are devices with the same performance.

[0020] In some embodiments of this application, when the voltage output by the output voltage control circuit is input to the non-inverting input terminal of the amplifier, the second control switch is an NMOS transistor and the first control switch is a PMOS transistor;

[0021] When the voltage output by the output voltage control circuit is input to the inverting input terminal of the amplifier, the second control switch is a PMOS transistor, and the first control switch is an NMOS transistor.

[0022] In some embodiments of this application, when the voltage output by the output voltage control circuit is input to the non-inverting input terminal of the amplifier, the second control switch is an NMOS transistor and the first control switch is a PMOS transistor;

[0023] The gate of the NMOS transistor is connected to the output terminal of the amplifier, the source is connected to the second current-limiting resistor, the voltage across the second current-limiting resistor is used as the feedback voltage, and the drain is connected to the drain of the PMOS transistor through the first current-limiting resistor.

[0024] The source of the PMOS transistor is connected to a first DC power supply, and the gate is connected to the drain of the PMOS transistor.

[0025] In some embodiments of this application, the switching modulation circuit includes:

[0026] First switch control circuit;

[0027] The second switch control circuit is connected in parallel with the first switch control circuit and the second switch control circuit, and both receive the current output by the adjustable current source. The optical device is connected in the second switch control circuit.

[0028] The first logic gate has one input terminal receiving the pulse electrical signal, another input terminal receiving a high level, and its output terminal used to control the on / off state of the first switch control circuit.

[0029] The second logic gate has one input terminal receiving the pulse electrical signal, another input terminal receiving a high level, and its output terminal used to control the on / off state of the second switch control circuit.

[0030] In this circuit, only one of the first switch control circuit and the second switch control circuit is connected when the pulse signal is at the same level.

[0031] In some embodiments of this application, the first logic gate is an AND gate, one input terminal of the first logic gate receives the pulse electrical signal, the other input terminal receives a high level, and the output terminal is connected to the control terminal of the first switch control circuit;

[0032] The second logic gate is a NAND gate. One input of the second logic gate receives the pulse electrical signal, the other input receives a high level, and the output is connected to the control terminal of the second switch control circuit; or

[0033] The first logic gate is a NAND gate. One input of the first logic gate receives the pulse electrical signal, the other input receives a high level, and the output is connected to the control terminal of the first switch control circuit.

[0034] The second logic gate is an AND gate. One input of the second logic gate receives the pulse electrical signal, the other input receives a high level, and the output is connected to the control terminal of the second switch control circuit.

[0035] In some embodiments of this application, the optical emitting module further includes:

[0036] shell;

[0037] The PCBA, including the light-emitting component and the PCBA, is installed inside the housing, and the light source driving circuit is connected to the PCBA.

[0038] In some embodiments of this application, the PCBA includes two parallel rigid PCBs connected to a flexible circuit board; the light source driving circuit is disposed on the PCBA, and the optical device is connected to the flexible circuit board.

[0039] Terminal blocks are soldered onto the two rigid PCBs respectively. The terminal blocks extend outward through the housing and are used to receive pulse electrical signals.

[0040] In some embodiments of this application, terminal blocks are soldered onto the two rigid PCBs respectively, and the terminal blocks extend outward through the housing to receive pulse electrical signals.

[0041] The optical emission module involved in this application has the following advantages compared with the prior art:

[0042] The optical emission module can adjust and control the output voltage through the output voltage control circuit. The output voltage is used to control the output current of the subsequent adjustable current source circuit. This current serves as the driving current for the optical emission component. The switching modulation circuit is used to modulate the optical emission component according to the externally input pulse electrical signal to emit an optical signal. In this way, the light source driving circuit can adjust the luminous power of the optical emission component in a wide temperature range (-55℃~125℃), avoiding significant changes in the light emission characteristics of the light source due to temperature. This achieves temperature characteristic compensation of the light source and improves the reliability and accuracy of signal transmission.

[0043] A second objective of this application is to provide an optical module, including an optical transmitting module, or both an optical transmitting module and an optical receiving module;

[0044] The light emitting module includes a light source driving circuit and a light emitting component. The light source driving circuit includes:

[0045] Output voltage control circuit, which is used to regulate and control the output voltage;

[0046] An adjustable current source circuit receives the voltage output by the output voltage control circuit and outputs a light source driving current for the optical devices in the emitting light assembly.

[0047] A switching modulation circuit receives pulse electrical signals and the current output by the adjustable current source circuit, and is used to modulate the optical signal emitted by the optical device.

[0048] The optical receiving module includes a receiving driving circuit and a receiving optical component. The receiving driving circuit includes:

[0049] A transimpedance amplifier circuit is used to receive the current signal output by the photodetector in the receiving optical component and convert it into an amplified voltage signal.

[0050] A common-mode amplifier circuit is used to receive the voltage signal output by the transimpedance amplifier circuit and to form voltage negative feedback to the amplifier in the transimpedance amplifier circuit.

[0051] The decision threshold control circuit is used to control the generation of a reference level;

[0052] The decision comparison circuit receives the level signal output by the common-mode cancellation amplifier circuit at its first input terminal, and its second input terminal is connected to the reference level and the voltage negative feedback loop respectively. The decision comparison circuit outputs an electrical signal.

[0053] The entire optical module is formed by using the optical emitting module and optical receiving module as described above. The optical emitting module can compensate for the temperature characteristics of the light source by adjusting the driving current within a wide temperature range. The optical receiving module can adjust the decision threshold (i.e., the reference level) within a wide temperature range through the receiving driving circuit, thereby compensating for the high temperature characteristics of the receiving optical component in the optical receiving module. This avoids the receiving optical component being affected by temperature, thus preventing the decision of the DC signal from being affected. In this way, the optical module with the light source driving circuit and the receiving driving circuit can transmit signals reliably and accurately in a wide temperature range.

[0054] Other features and advantages of the present invention will become clearer after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a circuit schematic diagram of one embodiment of a conventional standard optical module;

[0057] Figure 2 This is a circuit diagram of the light source driving circuit in one embodiment of the light emission module proposed in this invention;

[0058] Figure 3 This is a circuit diagram of the light source driving circuit in one embodiment of the light emission module proposed in this invention;

[0059] Figure 4 This is a structural diagram of one embodiment of the optical emission module proposed in this invention;

[0060] Figure 5 This is an exploded view of one embodiment of the optical emission module proposed in this invention;

[0061] Figure 6 This is a structural diagram of the cover plate in one embodiment of the optical emission module proposed in this invention;

[0062] Figure 7 This is a structural diagram of the lower shell at a first angle in one embodiment of the optical emission module proposed in this invention;

[0063] Figure 8 This is a structural diagram of the lower shell at a second angle in one embodiment of the optical emission module proposed in this invention;

[0064] Figure 9 This is a connection diagram of the PCBA and T-shaped flexible circuit board in one embodiment of the optical emission module proposed in this invention;

[0065] Figure 10 This is a structural diagram of the light-emitting component in one embodiment of the light-emitting module proposed in this invention;

[0066] Figure 11 This is a schematic diagram of the structure of the adapter shell in one embodiment of the optical emission module proposed in this invention;

[0067] Figure 12 This is a circuit diagram of the receiving drive circuit of the optical receiving module in one embodiment of the optical module proposed in this invention;

[0068] Figure 13 This is a circuit diagram of the receiving drive circuit of the optical receiving module in one embodiment of the optical module proposed in this invention;

[0069] Figure 14 This is a structural diagram of the optical receiving module in one embodiment of the optical module proposed in this invention;

[0070] Figure 15 This is an exploded view of the optical receiving module in one embodiment of the optical module proposed in this invention;

[0071] Figure label:

[0072] 100. Optical emitting module; 110. Housing; 111. Cover plate; 1111. Fixing post; 1112. Engaging plate; 1113. Engaging groove; 112. Lower shell; 1121. Support post; 1122. First side wall; 11221 / 11222. Positioning groove; 1123. Second side wall; 11231 / 11232. Positioning groove; 11233. Engaging platform; 11234. Mounting port; 1124. Positioning hole;

[0073] 120. PCBA; 121 / 122. PCB; 123. Light source driving circuit; 1231. Output voltage control circuit; 1232. Adjustable current source circuit; 12321. Current regulation circuit; 12322. Amplifier; 12323. Current source; 1233. Switching modulation circuit;

[0074] 130. Flexible circuit board; 131. First connecting segment; 132. Second connecting segment; 1321. Soldering hole;

[0075] 140. Terminal block; 141. Second electrical pin;

[0076] 150. Emitting optical component; 151. Optical device; 152. Connecting plate; 153. Connecting pin array; 154. Pin protrusion;

[0077] 160. Fiber optic assembly; 161. Ceramic ferrule; 162. Ferrule retainer; 163. Pigtail sheath; 164. Fiber optic cable; 165. Fiber optic connector;

[0078] 170. Adapter shell; 171. Connecting ring; 172. Bayonet; 173. Mounting plate; 174. Mounting platform; 175. Mating part; 176. Mounting slot;

[0079] 180. Screws;

[0080] 200. Optical receiver module; 210. Housing; 211. Cover; 212. Lower housing; 220. PCBA; 221 / 222. PCB; 223. Receiver drive circuit; 2231. Transimpedance amplifier circuit; 2232. Common-mode cancellation amplifier circuit; 2233. Decision threshold control circuit; 2234. Decision comparator circuit; 2235. Buffered output circuit; 2236. Voltage follower; 230. Flexible circuit board; 240. Terminal block; 250. Receiver optical assembly; 260. Fiber optic assembly; 270. Adapter housing. Detailed Implementation

[0081] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0082] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0083] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0084] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0085] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0086] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0087] See Figure 1 A standard optical module circuit includes a transmitter driver chip, a receiver driver chip, and a control chip. The power supply Vcc supplies power to the transmitter driver chip, receiver driver chip, control chip, and the transmitter and receiver optical components in the optical module to ensure the normal photoelectric conversion function of the optical module.

[0088] The transmitter driver chip is used to drive the transmitting optical component, and the receiver driver chip is used to drive the receiving optical component. The transmitter driver chip and the receiver driver chip are respectively connected to the control chip.

[0089] During transmission, an electrical signal is input to the transmission driver chip and processed by the transmission driver chip to drive the transmission optical component to transmit and output an optical signal.

[0090] During reception, the optical receiving component receives the optical signal and generates a response current corresponding to the optical signal. This response current is input to the receiving driver chip, which processes it and outputs an electrical signal to complete the photoelectric conversion process.

[0091] The emitting light component may include lasers (e.g., EML (External Modulation Laser), DML (Direct Modulation Laser), light-emitting diodes), MPD (Monitor Photo Detector), etc.

[0092] The receiving optical components may include photodetectors PD (Photo Diode) / APD (Avalanche Photo Diode), ITA (Trans-impedance amplifier), etc.

[0093] The transmitting driver chip is used to implement the light source driving circuit 123, and the receiving driver chip is used to implement the receiving driving circuit 223.

[0094] The characteristics of optical devices in the emitting light assembly are affected by temperature, especially at high temperatures, where their light emission characteristics change dramatically. Therefore, it is necessary to solve the problem of controlling the light emission power of the light source at high temperatures.

[0095] To avoid significant changes in the luminescence characteristics of the light source due to temperature over a wide temperature range, see [reference needed]. Figures 2 to 11 This application relates to a light emitting module 100, which is used to compensate for the temperature characteristics of the light source by adjusting the light source driving current in a wide temperature range, thereby improving the reliability and accuracy of signal transmission.

[0096] See Figure 2 The light source driving circuit 123 includes an output voltage control circuit 1231, an adjustable current source circuit 1232, and a switching modulation circuit 1233.

[0097] The output voltage control circuit 1231 is used to adjust and control the output voltage, which is a power source that can generate a power source for the subsequent adjustable current source circuit 1232 to drive the optical device in the emitting optical component 150 to emit optical signals.

[0098] Furthermore, the light source driving current generated by the adjustable current source circuit 1232 varies depending on the magnitude of the output voltage output by the output voltage control circuit 1231. Therefore, by controlling the magnitude of the voltage output by the output voltage control circuit 1231, the current generated by the adjustable current source circuit 1232, i.e., the light source driving current, can be controlled and adjusted.

[0099] In some embodiments of this application, the output voltage control circuit 1231 includes a control unit and a digital-to-analog converter.

[0100] The control unit is used to control the output digital signal representing voltage; the digital-to-analog converter can be used to convert the digital signal into an analog signal to obtain the voltage analog signal corresponding to the data signal.

[0101] Since the control unit generally uses an integrated MCU chip and is controllable, different voltage signals can be output by the MCU through control.

[0102] In some embodiments of this application, an MCU chip and a digital-to-analog converter can be selected as the output voltage control circuit 1231, see [link to relevant documentation]. Figure 3 Alternatively, an MCU chip with digital-to-analog conversion function can be selected as the output voltage control circuit 1231.

[0103] The adjustable current source circuit 1232 is connected to the output voltage control circuit 1231, and its output current can be adjusted according to the voltage output by the front-end output voltage control circuit 1231.

[0104] That is, the adjustable current source circuit 1232 can act as a current source and output the light source driving current as described above.

[0105] In some embodiments of this application, the adjustable current source circuit 1232 includes a current regulation circuit 12321, an amplifier 12322, and a current source 12323.

[0106] The current regulation circuit 12321 includes a first control switch and a second control switch connected in series on the main circuit. The control terminal of the first control switch is connected to its output terminal, and the control terminal of the second control switch is connected to the output terminal of the amplifier 12322.

[0107] One input terminal of amplifier 12322 receives the voltage output by output voltage control circuit 1231.

[0108] The current regulation circuit 12321 also includes a voltage divider resistor. When current flows through the current regulation circuit 12321, the voltage divider generated on the voltage divider resistor is fed back to the other input terminal of the amplifier 12322 as a voltage negative feedback of the amplifier 12322. Therefore, the current regulation circuit 12321 adjusts the current flowing through it according to the voltage output by the output terminal of the amplifier 12322.

[0109] In the embodiments of this application, the voltage output by the output voltage control circuit 1231 can also be filtered before being input to the control terminal of the second control switch to improve the accuracy of signal control.

[0110] The current source 12323 includes multiple controllable switches connected in parallel. The control terminals of the multiple controllable switches are respectively connected to the control terminal of the first control switch. The sum of the currents flowing through each controllable switch is output by the current source 12323 as the light source driving current output by the adjustable current source circuit 1232.

[0111] The first control switch and the multiple controllable switches are devices with the same performance, for example, N controllable switches are set.

[0112] Thus, when current I flows through the current adjustable circuit 12321, that is, when the current flowing through the first control switch is I, since multiple controllable switches are devices with the same performance as the first control switch, the current flowing through each controllable switch is also close to I. Therefore, the current source 12323 will generate a light source driving current of approximately N*I.

[0113] In this way, not only can the voltage output by the output voltage control circuit 1231 be used to adjust the current I, but after passing through the current source 12323, an amplified light source driving current will also be generated to drive the optical device in the emitting light component 150.

[0114] In some embodiments of this application, see Figure 3 The voltage output by the output voltage control circuit 1231 is input to the non-inverting input terminal of the amplifier 12322. The second control switch is NMOS transistor Q6, and the first control switch is PMOS transistor Q1A.

[0115] The current-adjustable circuit 12321 includes a first control switch PMOS transistor Q1A, a second control switch NMOS transistor Q6, a first current-limiting resistor R2, and a second current-limiting resistor R5 connected in series in the circuit.

[0116] The gate of the second control switch NMOS transistor Q6 is connected to the output terminal of amplifier U112322, the source is grounded through the second current limiting resistor R5, and the drain is connected to the drain of the second control switch PMOS transistor Q1A through the first current limiting resistor R2. The source of the first control switch PMOS transistor Q1A is connected to the first DC power supply VCC, and the gate of the first control switch PMOS transistor Q1A is connected to its drain and the control terminals of multiple controllable switches.

[0117] The voltage divider on the second current-limiting resistor R5 is fed back to the negative inverting input of amplifier U112322.

[0118] In this adjustable current source circuit 1232, by utilizing the characteristics of NMOS transistor Q6 and PMOS transistor Q1A operating in the variable resistance region, the current I flowing through the current adjustable circuit 12321 can be adjusted according to the voltage output by the output voltage control circuit 1231.

[0119] When the output voltage control circuit 1231 does not output voltage, that is, there is no signal at the non-inverting input terminal of amplifier U1 12322, amplifier U1 12322 also does not output signal. At this time, the second control switch NMOS transistor Q6 is turned off, and no current flows through the current regulation circuit 12321.

[0120] As the output voltage control circuit 1231 outputs a voltage, amplifier U1 12322 immediately activates and outputs a signal at the output terminal. Subsequently, both the second control switch NMOS transistor Q6 and the first control switch PMOS transistor Q1A operate in the variable resistance region, and the current I flowing through them gradually increases. This causes the voltage across the second current-limiting resistor R5 to gradually increase, thereby increasing the voltage fed back to the negative input terminal of amplifier U1 12322.

[0121] When the voltage difference between the positive and negative input terminals of amplifier U1 12322 reaches equilibrium, the output voltage of amplifier U1 12322 causes the current adjustable circuit 12321 to reach current I.

[0122] Since the first control switch PMOS transistor Q1A and the multiple controllable switches are all devices with the same performance, and the control terminal of the first control switch PMOS transistor Q1A is also connected to the control terminals of the multiple controllable switches respectively, the current flowing through each controllable switch is also close to I. After the three branches converge, the current source 12323 outputs a current close to 3*I to the next-level switch modulation circuit 1233.

[0123] In some embodiments of this application, a different number of controllable switches than three can be provided to achieve a larger amplification of the light source driving current.

[0124] As mentioned above, the controllable switch and the first control switch PMOS transistor Q1A can be adjacent transistors on the same wafer, with similar performance parameters and consistent external operating conditions.

[0125] In order to filter the voltage signal output by amplifier U1 12322, in some embodiments of this application, see [reference needed]. Figure 3 Set a filter capacitor C7.

[0126] One end of the filter capacitor C7 is connected between the output terminal of amplifier U1 12322 and the gate of the second control switch NMOS transistor Q6, and the other end is connected between the second current limiting resistor R5 and the negative input terminal of amplifier U1 12322. The filter capacitor C7 is used to filter the voltage signal output by amplifier U1 12322.

[0127] Furthermore, in order to filter the light source drive current output by current source 12323, see [link to relevant documentation]. Figure 3 It is also equipped with a grounding capacitor C8.

[0128] The non-grounded terminal of the grounding capacitor C8 is connected to the output terminal of the current source 12323.

[0129] In some embodiments of this application, when the voltage output by the output voltage control circuit 1231 is input to the negative phase input terminal of the amplifier U1, the second control switch can be a PMOS transistor, and the first control switch can be an NMOS transistor.

[0130] The current-adjustable circuit includes a first control switch NMOS transistor, a second control switch PMOS transistor, a first current-limiting resistor R2, and a second current-limiting resistor R5 connected in series in the circuit.

[0131] The gate of the second control switch PMOS transistor is connected to the output terminal of amplifier U1, the drain is grounded through the second current limiting resistor R5, and the source is connected to the source of the first control switch NMOS transistor through the first current limiting resistor R2. The drain of the first control switch NMOS transistor is connected to the first DC power supply VCC, and the gate of the first control switch NMOS transistor is connected to its source and the control terminal of multiple controllable switches.

[0132] The voltage divider on the second current-limiting resistor R5 is fed back to the non-inverting input of amplifier U1.

[0133] In this adjustable current source circuit 1232, by utilizing the characteristics of NMOS and PMOS transistors operating in the variable resistance region, the current I flowing through the adjustable current circuit can be adjusted according to the voltage output by the output voltage control circuit 1231.

[0134] When the output voltage control circuit 1231 does not output voltage, that is, there is no signal at the negative input terminal of amplifier U1, amplifier U1 also does not output signal. At this time, the second control switch PMOS transistor is turned off, and no current flows through the current regulation circuit.

[0135] As the output voltage control circuit 1231 outputs voltage, amplifier U1 immediately activates and outputs a signal at the output terminal. Subsequently, both the second control switch PMOS transistor and the first control switch NMOS transistor operate in the variable resistance region, and the current I flowing through it gradually increases, causing the voltage across the second current limiting resistor R5 to gradually increase as well. Consequently, the voltage fed back to the non-inverting input terminal of amplifier U1 also increases.

[0136] When the voltage difference between the positive and negative input terminals of the amplifier reaches equilibrium, the output voltage of amplifier U1 causes the current adjustable circuit to reach current I.

[0137] Since the first control switch NMOS transistor and the multiple controllable switches are all devices with the same performance, and the control terminal of the first control switch NMOS transistor is also connected to the control terminals of the multiple controllable switches respectively, the current flowing through each controllable switch is also close to I. After the three branches merge, the current source outputs a current close to 3*I to the next-stage switch modulation circuit 1233.

[0138] The switching modulation circuit 1233 includes a first switch control circuit, a second switch control circuit, a first logic gate, and a second logic gate.

[0139] The first switch control circuit and the second switch control circuit are connected in parallel, and both receive the light source driving current output by the adjustable current source circuit 1232. The optical device in the emitting light component 150 is connected to the second switch control circuit.

[0140] That is, when the second switch control circuit is turned on, the optical device emits light; when the second switch control circuit is turned off, the optical device does not emit light.

[0141] Both the first and second logic gates have two inputs and one output.

[0142] One input of both the first and second logic gates receives a high level, while the other input receives an external pulse signal.

[0143] The selection of the first logic gate and the second logic gate is based on the principle of selecting one of the first switch control circuit and the second switch control level to be turned on under the same level of the pulse signal. In this way, the light emission modulation process of the optical device in the emitting optical component 150 can be realized.

[0144] The output of the first logic gate is connected to the control terminal of the first switch control circuit to control the on / off state of the first switch control circuit; the output of the second logic gate is connected to the control terminal of the second switch control circuit to control the on / off state of the second switch control circuit.

[0145] In some embodiments of this application, see Figure 3 The first logic gate is an AND gate U4. One input terminal A of the first logic gate receives a pulse electrical signal, the other input terminal B receives a high level, and the output terminal is connected to the control terminal of the first switch control circuit.

[0146] The second logic gate is a NAND gate U5. One input terminal B of the second logic gate receives a pulse electrical signal, and the other input terminal A receives a high level. The output terminal is connected to the control terminal of the second switch control circuit.

[0147] As described above, both the first and second switch control circuits are circuits that are controlled to turn on by a high level.

[0148] In some embodiments of this application, see Figure 3 The first switch control circuit includes a current-limiting resistor R7 connected in series and a first switch transistor NMOS transistor Q4; the second switch control circuit includes an optical device D1, a capacitor C13, a resistor R9, and a second switch transistor NMOS transistor Q5, wherein the capacitor C13 and the resistor R9 are connected in series and then in parallel with the optical device D1, and then in series with the second switch transistor NMOS transistor Q5.

[0149] The gate of the first switching transistor, NMOS transistor Q4, is connected to the output of the first logic gate, the drain is connected to the current limiting resistor R7, and the source is grounded.

[0150] The gate of the second switching transistor, NMOS transistor Q5, is connected to the output of the second logic gate, the drain is connected to one end of the series connection of capacitor C13 and resistor R9 (different from the end connected to the adjustable current source circuit 1232), and the source is grounded.

[0151] When the pulse signal is low, the first logic gate outputs a low level, the first switch control circuit is turned off, the second logic gate outputs a high level, the second switch control circuit is turned on, and thus the optical device D1 emits light under the drive of the light source driving current.

[0152] When the pulse signal is high, the first logic gate outputs a high level, the first switch control circuit is turned on, the second logic gate outputs a low level, the second switch control circuit is turned off, and thus the optical device D1 does not emit light.

[0153] In this way, it is possible to modulate the light emission of the optical device D1.

[0154] As mentioned above, the first switching transistor can also be a PMOS transistor, and the second switching transistor can also be a PMOS transistor.

[0155] When the pulse signal is low, the first logic gate outputs a low level, the first switch control circuit is turned on, the second logic gate outputs a high level, the second switch control circuit is turned off, and thus the optical device D1 does not emit light.

[0156] When the pulse signal is high, the first logic gate outputs a high level, the first switch control circuit is turned off, the second logic gate outputs a low level, the second switch control circuit is turned on, and thus the optical device D1 emits light under the drive of the light source driving current.

[0157] In some embodiments of this application, the first logic gate can be a NAND gate, with one input terminal A receiving a pulse electrical signal, the other input terminal B receiving a high level, and the output terminal connected to the control terminal of the first switch control circuit.

[0158] The second logic gate is an AND gate. One input terminal B of the second logic gate receives a pulse electrical signal, and the other input terminal A receives a high level. The output terminal is connected to the control terminal of the second switch control circuit.

[0159] In some embodiments of this application, the first switch is an NMOS transistor, and the second switch is an NMOS transistor.

[0160] When the pulse signal is low, the first logic gate outputs a high level, the first switch control circuit is turned on, the second logic gate outputs a low level, the second switch control circuit is turned off, and thus the optical device D1 does not emit light.

[0161] When the pulse signal is high, the first logic gate outputs a low level, the first switch control circuit is turned off, the second logic gate outputs a high level, the second switch control circuit is turned on, and thus the optical device D1 emits light under the drive of the light source driving current.

[0162] Similarly, the first switch transistor described above can also be a PMOS transistor, and the second switch transistor can also be a PMOS transistor, which will not be elaborated here.

[0163] As described above, each circuit is constructed using discrete components, which can meet the transmission requirements of low-speed control signals (such as control signals and bus signals in aircraft systems).

[0164] In some embodiments of this application, to improve the vibration resistance and shock resistance of the optical emitting module 100, see [link to relevant documentation]. Figures 4 to 11 The optical transmitter module 100 is reliably packaged and has highly reliable optical and electrical ports, wherein the optical port is used to connect optical signal transmission devices (such as optical fibers or optical connectors) and the electrical port is used to receive external pulse electrical signals.

[0165] The optical emitting module 100 also includes a housing 110 and a PCBA 120. The PCBA 120 and the emitting light component 150 are both installed inside the housing 110, realizing the overall encapsulation of the optical emitting module 100.

[0166] For the light emitting module 100, the light source driving circuit 123 and the control part connected to the light source driving circuit 123 are both set on the PCBA 120.

[0167] The light source driving circuit 123 is connected to the PCBA 120, so that during transmission, the control part on the PCBA 120 controls the light source driving circuit 123 to drive the optical device to emit light signals.

[0168] To achieve good heat dissipation in a small package, see Figure 5 In this application, PCBA 120 adopts a double-row vertical arrangement, and flexible circuit board 130 is electrically connected to PCBA 120 and also electrically connected to light emitting component 150.

[0169] In some embodiments of this application, see Figure 4 , Figure 5 and Figure 9 PCBA 120 includes two parallel rigid PCBs 121 / 122, with the flexible circuit board 130 as described above connected between the two rigid PCBs 121 / 122.

[0170] Terminal blocks 140 are soldered onto two corresponding rigid PCBs 121 / 122, and the terminal blocks 140 extend outside the housing 110 to form external electrical ports for receiving external pulse electrical signals.

[0171] The terminal block 140 is provided with a plurality of first electrical pins (not shown), and the rigid PCB 121 / 122 is provided with pin array solder holes (not shown) corresponding to the plurality of first electrical pins. The plurality of first electrical pins extend into and are soldered into the pin array solder holes, thereby enabling the plurality of first electrical pins to be soldered onto the rigid PCB 121 / 122, so that each first electrical pin is electrically connected to the rigid PCB 121 / 122 respectively.

[0172] See Figure 5The terminal block 140 is also provided with a plurality of second electrical pins 141, which extend out of the housing 110 to form an external electrical port.

[0173] In this way, the connection between PCBA 120, light-emitting component 150 and terminal block 140 is cleverly achieved. The structure is compact and achieves miniaturization. At the same time, both sides of PCB 121 / 122 form heat dissipation channels with the housing 110, maximizing the heat dissipation area of ​​PCBA 120.

[0174] In some embodiments of this application, see Figure 10 The light-emitting component 150 includes an optical device 151 (e.g., a light-emitting diode, i.e., a light-emitting diode). Figure 3 The diagram shows a light-emitting diode (LED) D1, a connecting plate 152, and a connecting pin array 153. The optical device 151 is used to emit light signals when driven and is electrically connected to the connecting plate 152. The connecting pin array 153 is disposed on the connecting plate 152 and is located on a different side of the connecting plate 152 from the optical device 151.

[0175] To facilitate the installation of the optical device 151, the optical device 151 is installed inside the adapter housing 170, which is installed inside the outer housing 110. The connecting pin array 153 of the emitting light assembly 150 is soldered onto the flexible circuit board 130.

[0176] In some embodiments of this application, see Figures 5 to 8 The outer casing 110 includes a lower casing 112 and a cover plate 111.

[0177] The lower shell 112 is rectangular and has a top opening. The projection of the cover plate 111 is rectangular. The cover plate 111 is fastened to the top opening of the lower shell 112 to close the top opening.

[0178] See Figure 6 Two fixing posts 1111 are provided on the bottom surface of the cover plate 111 facing the top opening, and the fixing posts 1111 are provided with threaded holes inside.

[0179] Correspondingly, two support columns 1121 are provided on the inner surface of the bottom plate of the lower shell 112, and the support columns 1121 are provided with threaded holes.

[0180] The two fixed posts 1111 are respectively connected to the two support posts 1121 and are connected by screws 180, thereby realizing the connection between the lower shell 112 and the cover plate 111.

[0181] In some embodiments of this application, the lower shell 112 and the cover plate 111 may also be connected by other means common in the art, without specific limitations.

[0182] The lower shell 112 and the cover plate 111 are both made of metal materials with good heat dissipation performance commonly used in this technical field, which is conducive to the heat dissipation channel between PCBA 120 and shell 110.

[0183] See Figure 7 The two corresponding sidewalls on the lower shell 112 are defined as the first sidewall 1122 and the second sidewall 1123. The inner side of the first sidewall 1122 is provided with two spaced positioning grooves 11221 / 11222, and the inner side of the second sidewall 1123 is provided with two spaced positioning grooves 11231 / 11232.

[0184] Two rigid PCBs 121 / 122 are arranged parallel to each other and spaced apart inside the lower shell 112, and the rigid PCBs 121 / 122 are arranged vertically between the first side wall 1122 and the second side wall 1123.

[0185] One rigid PCB 122 has its two ends inserted into a positioning groove 11221 on the first side wall 1122 and a corresponding positioning groove 11232 on the second side wall 1123, respectively; the other rigid PCB 121 has its two ends inserted into another positioning groove 11222 on the first side wall 1122 and another corresponding positioning groove 11231 on the second side wall 1123, thereby allowing the rigid PCBs 121 / 122 to be stably and effectively installed in the lower shell 112.

[0186] The bottom plate of the lower housing 112 has positioning holes 1124 on its inner surface that mate with multiple second electrical pins 141 of the terminal block 140. Multiple second electrical pins 141 extend from the lower housing 112 through the positioning holes 1124. Through the multiple second electrical pins 141, the optical emitting module 100 is electrically connected to the external main circuit board to receive pulse electrical signals from the external main circuit board.

[0187] In some embodiments of this application, in order to achieve the dual-row vertical arrangement of PCBA 120, a plurality of first electrical pins on terminal block 140 are arranged in parallel, a plurality of second electrical pins 141 are arranged in parallel, and the plurality of first electrical pins and the plurality of second electrical pins 141 are perpendicular to each other.

[0188] See Figure 3 and Figure 9 The flexible circuit board 130 is connected to the same side end of the two rigid PCBs 121 / 122. The side wall of the lower shell 112 near the flexible circuit board 130 is the second side wall 1123 as described above. The second side wall 1123 is provided with a downwardly curved arc-shaped locking platform 11233, which is located between the two positioning grooves 11231 and 11232 of the second side wall 1123.

[0189] See Figure 6On the bottom surface of the cover plate 111, there is a locking plate 1112 extending away from the bottom surface of the cover plate 111, corresponding to the locking platform 11233. The locking plate 1112 is provided with a locking groove 1113 that is arc-shaped and recessed towards the cover plate 111.

[0190] When the cover plate 111 is fastened inside the lower shell 112, the engaging groove 1113 and the engaging platform 11233 engage and close together, forming a clearance area.

[0191] See Figure 11 The outer wall of the adapter shell 170 is provided with a mating part 175 in the circumferential direction. The engaging groove 1113 and the engaging platform 11233 are engaged and matched with the mating part 175, so that the mating part 175 is locked in the clearance area, thereby making the adapter shell 170 securely and effectively connected to the outer shell 110.

[0192] See Figure 7 and Figure 8 The second side wall 1123 of the lower shell 112 is provided with an installation port 11234, which is located outside the locking platform 11233 and between the two positioning grooves 11231 and 11232 of the second side wall 1123.

[0193] See Figure 11 The adapter shell 170 is also provided with a mounting plate 173. When the adapter shell 170 is installed inside the outer shell 110, the mounting plate 173 cooperates to cover the mounting opening 11234 (see Figure 4 This design allows the light emitting module 100 of this embodiment to have a flat and aesthetically pleasing appearance, and can prevent external moisture and impurities from entering the housing 110, thus protecting the PCBA 120 and the light emitting component 150 inside the housing 110.

[0194] The adapter housing 170 is provided with a mounting groove 176 that mates with the emitting light component 150. The mounting groove 176 is located on one side of the mounting plate 173 and is used to accommodate the optical device 151.

[0195] The mounting slot 176 has a connecting ring 171 at the opening edge. When the emitting light component 150 is engaged with the adapter shell 170, the light device 151 is installed in the mounting slot 176, and the connecting ring 171 is welded to the connecting plate 152, so that the light device 151 can be installed stably and effectively in the adapter shell 170.

[0196] In addition, to accurately position and install the emitting optical component 150, a bayonet 172 is provided on the connecting ring 171, see [link / reference] Figure 10 The connecting plate 152 is provided with a locking protrusion 154 that is adapted to the bayonet 172. When the connecting ring 171 is welded to the connecting plate 152, the locking protrusion 154 is positioned in the bayonet 172 and can play a positioning and guiding role.

[0197] For convenient connection between the flexible circuit board 130 and the light-emitting assembly 150, see [link / reference] Figure 5 and Figure 9 The flexible circuit board 130 is designed as a T-shaped flexible board, including a first connecting segment 131 and a second connecting segment 132. The second connecting segment 132 is mated between the two ends of the first connecting segment 131.

[0198] The first connecting segment 131 is connected to two rigid PCBs 121 and 122 on both sides respectively. The second connecting segment 132 extends along the extension direction of the second electrical pin 141 of the terminal block 140, so that the second connecting segment 132 is perpendicular to the connecting pin row 153 on the connecting plate 152, thereby better soldering and electrically connecting the connecting pin row 153 to the second connecting segment 132.

[0199] Specifically, see Figure 9 Multiple welding holes 1321 are provided on the second connecting section 132, and the connecting pin row 153 of the light emitting component 150 is welded into the multiple welding holes 1321.

[0200] To facilitate optical signal transmission, optical fiber is used for signal transmission; therefore, see [link to relevant documentation]. Figure 4 and Figure 5 The optical transmitting module 100 also includes an optical fiber assembly 160.

[0201] The optical fiber assembly 160 includes an optical fiber 164, a ceramic ferrule 161, a ferrule holder 162, a pigtail sheath 163, and an optical fiber connector 165.

[0202] A ferrule holder 162 is fixedly provided on the optical fiber 164. The ceramic ferrule 161 is interference-fitted with the ferrule holder 162, so that the ceramic ferrule 161 can be fixedly connected to the ferrule holder 162.

[0203] To facilitate the assembly of the optical fiber 164, the adapter housing 170 is also equipped with a mounting platform 174 (see [reference]). Figure 11 The ceramic ferrule 161 is formed on the other side of the mounting plate 173 away from the mounting groove 176 and has a connecting groove (not shown) that communicates with the mounting groove 176. The ceramic ferrule 161 is inserted into the connecting groove and the ferrule fixing body 162 is welded to the mounting platform 174, thereby realizing the fixed connection between the adapter shell 170 and one end of the fiber optic assembly 160.

[0204] The optical fiber 164 is provided with a pigtail sheath 163, and the end of the pigtail sheath 163 is sleeved on the outside of the ceramic ferrule 161, the ferrule fixing body 162 and the mounting platform 174, and is fixed against the outer surface of the connecting plate 152 (see...). Figure 4 In this way, the optical fiber 164 can be protected and prevented from being broken due to excessive stress.

[0205] Fiber 164 is resistant to high temperatures and has a wide temperature range, which can meet the needs of applications in harsh temperature environments.

[0206] The other end of the optical fiber 164 is provided with an optical fiber connector 165, forming an optical port for long-distance transmission of optical signals.

[0207] As described above, the optical emitting module 100 has a compact structure, small size, and light weight, which is conducive to realizing the miniaturized packaging design of the optical emitting module 100 and reducing the space occupied.

[0208] In this application, the transmitting optical component 150, the adapter shell 170, and the optical fiber component 160 are fixed by welding coupling, which ensures the high reliability of the optical port and improves the reliability and stability of optical path transmission.

[0209] Furthermore, a T-shaped flexible circuit board 130 is used to connect the dual-row vertically inserted PCBs 121 / 122. The soldered terminal block 140 extends out of the housing 110 to form an external electrical port, achieving reliable fixation of the electrical port. At the same time, the PCBA 120 contacts the housing 110 for heat dissipation, increasing the heat dissipation area and ensuring effective heat dissipation in small space installation environments.

[0210] In addition, the light source driving circuit 123 in the light emission module 100 can meet the requirements of compensating for the temperature characteristics of the light source in a wide temperature range, so as to achieve accurate transmission of light signals.

[0211] Therefore, the light emission module 100 provided in this application can be used in small spaces, high vibration (e.g., near aircraft engines), and wide temperature range scenarios.

[0212] As described above, the structural design of the light emitting module 100 and the circuit design of the light source driving circuit 123 in the light emitting module 100 are described.

[0213] Similarly, see Figure 12 and Figure 13 The optical receiving module 200 can also be designed in the same structure as the optical transmitting module 100.

[0214] That is, the optical receiver module 200 includes a housing 210, a PCBA 220, a flexible circuit board 230, a terminal block 240, an optical receiving component 250, an optical fiber component 260, an adapter housing 270, and screws 280.

[0215] In terms of hardware structure, the structures of the housing 210, PCBA 220, flexible circuit board 230, terminal block 140, receiving light component 250, optical fiber component 260, and adapter housing 270 are the same as those of the housing 110, flexible circuit board 120, flexible circuit board 130, terminal block 140, emitting light component 150, optical fiber component 160, and adapter housing 170 as described above.

[0216] See Figure 13 The PCBA 220 of this application also adopts a double-row vertical arrangement, including two parallel rigid PCBs 221 / 122, and the two rigid PCBs 221 / 222 are connected to the flexible circuit board 230 as described above; the housing 210 includes a lower housing 212 and a cover plate 211 that are interlocked with each other.

[0217] The specific differences between the optical receiver module 200 and the optical transmitter module 100 are mainly reflected in the following: (1) The PCBA 220 needs to design a receiver drive circuit 223 and its related control circuit; (2) The optical receiver component 250 includes a photodetector, and the corresponding optical receiver component 250 is electrically connected to the photodetector via a connecting board.

[0218] The differences between the optical receiver module 200 mentioned above will be explained in detail below.

[0219] The light receiving component 250 includes a photodetector (e.g., a photodiode).

[0220] Correspondingly, the receiving drive circuit 223 is used to receive the electrical signal converted by the photodetector, process it, and output the processed electrical signal to complete the photoelectric conversion process.

[0221] For the optical receiver module 200, the receiver drive circuit 223 and the control circuit connected to the receiver drive circuit 223 are both set on the PCBA 220, and the receiver drive circuit 223 is connected to the control part of the PCBA 220.

[0222] The existing optical receiver module 200 has only a phototransistor at the receiving end. This type of module requires an external driving circuit to complete the photoelectric transmission function and does not have the ability to adapt to a wide temperature range.

[0223] Currently, the photodetector in the optical receiving module is affected by temperature, and other characteristics also change significantly. In particular, the dark current changes exponentially above 100°C, which seriously affects the decision of DC signals. Therefore, it affects the accurate reception of signals in wide temperature range scenarios.

[0224] Therefore, in order to achieve high-temperature characteristic compensation of photodetectors over a wide temperature range, see [reference needed]. Figure 14 and Figure 15 This application relates to a receiver driving circuit 223.

[0225] The receiving drive circuit 223 includes a transimpedance amplifier circuit 2231, a common-mode elimination amplifier circuit 2232, a decision threshold control circuit 2233, and a decision comparator circuit 2234.

[0226] The transimpedance amplifier circuit 2231 is used to receive the current signal output by the photodetector in the receiving optical component 250 and convert it into an amplified voltage signal.

[0227] The photodetector described above can be a photodiode (see above). Figure 15 The photodiode (D2) is used to perform photoelectric conversion, converting the received light signal into a weak current signal.

[0228] The transimpedance amplifier circuit 2231 converts the weak current signal from the previous stage into a voltage signal and amplifies it to a certain extent. After the current signal is converted into a voltage signal, it is convenient for the subsequent circuit to process it.

[0229] The common-mode elimination amplifier circuit 2232 is used to receive the voltage signal output by the transimpedance amplifier circuit 2231 and form voltage negative feedback for the amplifier U2 in the transimpedance amplifier circuit 2231 to perform common-mode component removal processing on the voltage signal output by the transimpedance amplifier circuit 2231 (i.e., remove the DC level in the voltage signal) and further amplify the processed signal.

[0230] In some embodiments of this application, the transimpedance amplifier circuit 2231 includes an amplifier U2 that applies a negative reverse bias voltage across the input photodiode D2 (e.g., through resistors R10, R11, R12 and capacitor C10). The negative bias voltage across the photodiode D2 reduces the parasitic capacitance of the photodiode D2, and this lower capacitance increases the speed of the transimpedance amplifier circuit 2231.

[0231] In order to remove the common-mode component of the voltage signal output by the transimpedance amplifier circuit 2232, in some embodiments of this application, the common-mode elimination amplifier circuit 2232 includes an amplifier U5, and the voltage signal output by the transimpedance amplifier circuit 2231 is input to an input terminal of the amplifier U5.

[0232] In the transimpedance amplifier circuit 2231, the non-inverting input terminal of amplifier U2 is connected to a fixed potential Vref, and is also connected to the other input terminal of amplifier U5 through a current-limiting resistor R18. This allows the common-mode elimination amplifier circuit 2232 to form negative feedback with the preceding transimpedance amplifier circuit 2231, thereby performing common-mode component removal processing on the voltage signal output by the transimpedance amplifier circuit 2231.

[0233] After processing, the signal is amplified by amplifier U5 and output to the first input terminal of decision comparator circuit 2234.

[0234] In order to adjust the decision threshold, in some embodiments of this application, a decision threshold control circuit 2233 is provided to adjust and control the output reference level (i.e., the decision threshold) to provide a reference for the back-end decision comparison circuit 2234.

[0235] In some embodiments of this application, the decision threshold control circuit 2233 may include a control unit (not shown) and a digital-to-analog converter (not shown).

[0236] The control unit is used to control the output of a digital signal representing a reference level; the digital-to-analog converter can be used to convert the digital signal into an analog signal to obtain the voltage analog signal corresponding to the data signal.

[0237] Since the control unit generally uses an integrated MCU chip and is controllable, the decision threshold can be adjusted by controlling the MCU to output voltage signals of different levels.

[0238] In some embodiments of this application, an MCU chip and a digital-to-analog converter can be selected as the decision threshold control circuit, see [link to relevant documentation]. Figure 15 Alternatively, an MCU chip with digital-to-analog conversion function can be selected as the decision threshold control circuit 2233.

[0239] To enhance the driving capability, a voltage follower U6 2236 is connected after the decision threshold control circuit 2233, which, while enhancing the driving capability, outputs to the second input terminal of the subsequent decision comparator circuit 2234.

[0240] In addition, because the load affects the decision, the second input of the decision comparator circuit 2234 is also connected to a voltage negative feedback loop.

[0241] See Figure 15 The voltage negative feedback loop includes a resistor R21 and a capacitor C35 connected in parallel. One end of the parallel branch is connected to the output of the decision comparator circuit 2234, and the other end of the parallel branch is connected to the second input of the decision comparator circuit 2234.

[0242] Thus, the decision comparison circuit 2234 compares the signal output by the common-mode amplifier circuit 2232 with the reference level output by the decision threshold control circuit 2233, thereby reducing the noise introduced in the common-mode amplifier circuit 2232, and due to the introduced voltage negative feedback loop, the decision is affected by the back-end load.

[0243] The electrical signal output by the decision comparator circuit 2234 is connected to the user's back-end load.

[0244] In addition, in order to reduce the impact of the load on the optical receiver module 200, the receiver drive circuit 223 also includes a buffer output circuit 2235.

[0245] In some embodiments of this application, the buffered output circuit 2235 employs an AND gate.

[0246] Within a wide temperature range (-55℃~125℃), the receiving drive circuit 223 enables signal amplification and controllable adjustment of the decision threshold, thereby compensating for the high-temperature characteristics of the photodetector and preventing the photodetector from being affected by temperature in deciding the DC signal.

[0247] As described above, the optical receiver module 200 has a compact structure, small size, and light weight, which is conducive to realizing the miniaturized packaging design of the optical receiver module 200 and reducing the space occupied.

[0248] In this application, the optical receiving component 250, the adapter housing 270, and the optical fiber component 260 are fixed by welding coupling, which ensures the high reliability of the optical port and improves the reliability and stability of optical path transmission.

[0249] Furthermore, a T-shaped flexible circuit board 230 is used to connect the dual-row vertically inserted PCBs 221 / 222. The soldered terminal block 240 extends out of the housing 210 to form an external electrical port, achieving reliable fixation of the electrical port. At the same time, the PCBA 220 contacts the housing 210 for heat dissipation, increasing the heat dissipation area and ensuring heat dissipation effect in small space installation environments.

[0250] In addition, the receiving drive circuit 223 in the optical receiving module 200 can meet the requirements of compensating for the high temperature characteristics of the photodetector in a wide temperature range, and realize reliable conversion of photoelectric signals.

[0251] Therefore, the optical receiving module 200 provided in this application can be used in small spaces, high vibration (e.g., near aircraft engines), and wide temperature range scenarios.

[0252] This application also relates to an optical module, which includes an optical transmitting module and an optical receiving module.

[0253] The optical transmitting module in the optical module can be the optical transmitting module 100 as described above, or the optical receiving module in the optical module can be the optical receiving module 200 as described above, or the optical transmitting module in the optical module can be the optical transmitting module 100 as described above and the optical receiving module in the optical module can be the optical receiving module 200 as described above.

[0254] When the optical module has the optical emitting module 100 as described above, the optical module has the advantages of the optical emitting module 100 as described above.

[0255] When the optical module has the optical receiving module 200 as described above, the optical module has the advantages described above for the optical receiving module 200.

[0256] When the optical module has the optical emitting module 100 and the optical receiving module 200 as described above, the optical module has the advantages of the optical emitting module 100 and the optical receiving module 200 as described above.

[0257] The advantages of the optical module can be obtained by referring to the advantages of the optical transmitter module 100 and / or the optical receiver module 200 as described above, and will not be elaborated here.

[0258] Of course, the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light emitting module, comprising a light source driving circuit and a light emitting component, wherein the light emitting component is driven by the light source driving circuit to emit light signals, characterized in that, The light source driving circuit includes: Output voltage control circuit, which is used to regulate and control the output voltage; An adjustable current source circuit receives the voltage output by the output voltage control circuit and outputs a light source driving current for the optical devices in the emitting light assembly. The adjustable current source circuit includes: The current regulation circuit includes a first control switch and a second control switch connected in series on the main line, and the control terminal of the first control switch is connected to its output terminal. An amplifier has one input terminal receiving the voltage output by the output voltage control circuit, another input terminal receiving the feedback voltage of the current regulation circuit, and its output terminal connected to the control terminal of the second control switch. The current regulation circuit regulates the current flowing through the current regulation circuit according to the voltage output by the amplifier's output terminal. A current source includes multiple controllable switches connected in parallel. The control terminals of the multiple controllable switches are respectively connected to the control terminal of the first control switch. The current source outputs the sum of the currents flowing through each controllable switch as the driving current of the light source. The first control switch and the multiple controllable switches are devices with the same performance. A switching modulation circuit receives pulse electrical signals and the current output by the adjustable current source circuit, and is used to modulate the optical signal emitted by the optical device.

2. The optical emitting module according to claim 1, characterized in that, The output voltage control circuit includes: Control unit, which is used to control the output digital signal representing voltage; A digital-to-analog converter unit is used to convert the digital signal into an analog signal, wherein the analog signal is the voltage output by the output voltage control circuit.

3. The optical emitting module according to claim 1, characterized in that, When the voltage output by the output voltage control circuit is input to the non-inverting input terminal of the amplifier, the second control switch is an NMOS transistor, and the first control switch is a PMOS transistor. When the voltage output by the output voltage control circuit is input to the inverting input terminal of the amplifier, the second control switch is a PMOS transistor, and the first control switch is an NMOS transistor.

4. The optical emitting module according to claim 3, characterized in that, When the voltage output by the output voltage control circuit is input to the non-inverting input terminal of the amplifier, the second control switch is an NMOS transistor, and the first control switch is a PMOS transistor. The gate of the NMOS transistor is connected to the output terminal of the amplifier, the source is connected to the second current-limiting resistor, the voltage across the second current-limiting resistor is used as the feedback voltage, and the drain is connected to the drain of the PMOS transistor through the first current-limiting resistor. The source of the PMOS transistor is connected to a first DC power supply, and the gate is connected to the drain of the PMOS transistor.

5. The optical emitting module according to claim 1, characterized in that, The switching modulation circuit includes: First switch control circuit; The second switch control circuit is connected in parallel with the first switch control circuit and both receive the current output by the adjustable current source. The optical device is connected in the second switch control circuit. The first logic gate has one input terminal receiving the pulse electrical signal, another input terminal receiving a high level, and its output terminal used to control the on / off state of the first switch control circuit. The second logic gate has one input terminal receiving the pulse electrical signal, another input terminal receiving a high level, and its output terminal used to control the on / off state of the second switch control circuit. In this circuit, only one of the first switch control circuit and the second switch control circuit is connected when the pulse signal is at the same level.

6. The optical emitting module according to claim 5, characterized in that, The first logic gate is an AND gate. One input terminal of the first logic gate receives the pulse electrical signal, the other input terminal receives a high level, and the output terminal is connected to the control terminal of the first switch control circuit. The second logic gate is a NAND gate. One input of the second logic gate receives the pulse electrical signal, the other input receives a high level, and the output is connected to the control terminal of the second switch control circuit; or The first logic gate is a NAND gate. One input of the first logic gate receives the pulse electrical signal, the other input receives a high level, and the output is connected to the control terminal of the first switch control circuit. The second logic gate is an AND gate. One input of the second logic gate receives the pulse electrical signal, the other input receives a high level, and the output is connected to the control terminal of the second switch control circuit.

7. The optical emitting module according to claim 1, characterized in that, The optical emitting module also includes: shell; The PCBA, including the light-emitting component and the PCBA, is installed inside the housing, and the light source driving circuit is connected to the PCBA.

8. The optical emitting module according to claim 7, characterized in that, The PCBA includes two parallel rigid PCBs connected to a flexible circuit board; the light source driving circuit is disposed on the PCBA, and the optical device is connected to the flexible circuit board. Terminal blocks are soldered onto the two rigid PCBs respectively. The terminal blocks extend outward through the housing and are used to receive pulse electrical signals.

9. An optical module, characterized in that, This includes an optical transmitting module, or both an optical transmitting module and an optical receiving module; The light emitting module includes a light source driving circuit and a light emitting component. The light source driving circuit includes: Output voltage control circuit, which is used to regulate and output voltage; An adjustable current source circuit receives the voltage output by the output voltage control circuit and outputs a light source driving current for the optical devices in the emitting light assembly. A switching modulation circuit receives pulse electrical signals and the current output by the adjustable current source circuit, and is used to modulate the optical signal emitted by the optical device. The optical receiving module includes a receiving driving circuit and a receiving optical component. The receiving driving circuit includes: A transimpedance amplifier circuit is used to receive the current signal output by the photodetector in the receiving optical component and convert it into an amplified voltage signal. A common-mode amplifier circuit is used to receive the voltage signal output by the transimpedance amplifier circuit and to form voltage negative feedback to the amplifier in the transimpedance amplifier circuit. The decision threshold control circuit is used to control the generation of a reference level; The decision comparison circuit receives the level signal output by the common-mode cancellation amplifier circuit at its first input terminal, and its second input terminal is connected to the output terminal of the decision threshold control circuit and the voltage negative feedback loop, respectively. The decision comparison circuit outputs an electrical signal.

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