An optical module

Abstract

The present application discloses an optical module, including an optical transceiver submodule. The optical transceiver submodule includes an optical receiver. An optical receiver is provided with an optoelectronic conversion component, an operational amplifier and an RC circuit. The operational amplifier, the reverse input end is respectively connected to the optoelectronic conversion component and the first end of the RC circuit, and the output end is connected to the second end of the RC circuit. A logic control circuit and a limiting amplifier circuit are arranged on the surface of a circuit board. The logic control circuit, the first end is connected to the output end of the operational amplifier, and the second end is connected to the second end of the limiting amplifier circuit, and is used to select any sub-circuit in the RC circuit to be turned on according to the LOS signal. In the present application, the logic control circuit selects the first RC sub-circuit or the second RC sub-circuit to be turned on through the LOS signal output by the limiting amplifier circuit, so as to achieve an accurate match between the transmission rate of the input optical signal and the bandwidth selected by the parameters of the first RC sub-circuit or the second RC sub-circuit, thereby improving the signal transmission quality and the receiving sensitivity of the optical module.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an optical module. Background Art

[0002] For a 10G optical module, it can receive optical signals with rates of 10G and 1.25G in different time periods. The optical transmission submodule of the 10G optical module includes an avalanche diode, a transimpedance amplifier, a 10G limiting amplifier and a 1.25G limiting amplifier, wherein the photoelectric conversion component is electrically connected to the first end of the transimpedance amplifier, and the second end of the transimpedance amplifier is electrically connected to the 10G limiting amplifier and the 1.25G limiting amplifier respectively, and the transimpedance amplifier includes not only a feedback resistor and a feedback capacitor electrically connected in parallel, but also an operational amplifier.

[0003] In traditional 10G optical modules, the feedback resistor and feedback capacitor of the transimpedance amplifier have a set of compatible feedback resistor and feedback capacitor values. The bandwidth selected by the feedback resistor and feedback capacitor values ​​is greater than 1.25G, which is equal to 10G. When a 1.25G optical signal is input, optical signals with a bandwidth greater than 1.25G and a bandwidth less than 10G can be converted into voltage signals by the transimpedance amplifier, which seriously affects the receiving sensitivity of the optical module. Summary of the invention

[0004] The present application provides an optical module to improve the receiving sensitivity of the optical module.

[0005] An optical module, comprising:

[0006] Circuit boards;

[0007] The optical transceiver submodule includes an optical receiver and is electrically connected to the circuit board;

[0008] An optical receiver, which is provided with a photoelectric conversion component, an operational amplifier and an RC circuit;

[0009] An operational amplifier, wherein the reverse input terminal is electrically connected to the photoelectric conversion component and the first terminal of the RC circuit respectively, the forward input terminal is grounded, and the output terminal is electrically connected to the second terminal of the RC circuit;

[0010] An RC circuit comprising a first RC sub-circuit and a second RC sub-circuit;

[0011] a first RC subcircuit, a first end of which is electrically connected to a first end of a second RC subcircuit, and a second end of which is electrically connected to a second end of the second RC subcircuit;

[0012] A circuit board, on the surface of which a logic control circuit and a limiting amplifier circuit are arranged;

[0013] A logic control circuit, wherein the first end is electrically connected to the output end of the operational amplifier and the second end of the RC circuit respectively, and the second end is electrically connected to the second end of the limiting amplifier circuit, and is used to select the first RC sub-circuit or the second RC sub-circuit to be turned on according to the LOS signal output by the limiting amplifier circuit;

[0014] A limiting amplifier circuit, the first end of which is electrically connected to the output end of the operational amplifier, comprises a first limiting amplifier and a second limiting amplifier;

[0015] The first limiting amplifier has a first end electrically connected to the first end of the second limiting amplifier, and a second end electrically connected to the second end of the second limiting amplifier.

[0016] Beneficial effects: The present application provides an optical module, including a circuit board and an optical transceiver submodule electrically connected to the circuit board. The optical transceiver submodule includes an optical receiver. An optoelectronic conversion component, an operational amplifier and an RC circuit are arranged in the optical receiver. The operational amplifier, the reverse input end is electrically connected to the optoelectronic conversion component and the first end of the RC circuit respectively, the forward input end is grounded, and the output end is electrically connected to the second end of the RC circuit. The RC circuit includes a first RC subcircuit and a second RC subcircuit. The first RC subcircuit, the first end is electrically connected to the first end of the second RC subcircuit, and the second end is electrically connected to the second end of the second RC subcircuit. A logic control circuit and a limiting amplifier circuit are arranged on the surface of the circuit board. The logic control circuit, the first end is electrically connected to the output end of the operational amplifier and the second end of the RC circuit respectively, and the second end is electrically connected to the second end of the limiting amplifier circuit, and is used to select the first RC subcircuit or the second RC subcircuit to be turned on according to the LOS signal output by the limiting amplifier circuit. The limiting amplifier circuit, the first end is electrically connected to the output end of the operational amplifier, and includes a first limiting amplifier and a second limiting amplifier. A first limiting amplifier, the first end is electrically connected to the first end of the second limiting amplifier, and the second end is electrically connected to the second end of the second limiting amplifier. Since the transmission rate of the optical signal corresponds to the LOS signal output by the first limiting amplifier as a low level when the first RC sub-circuit is turned on, and the transmission rate of the optical signal corresponds to the LOS signal output by the first limiting amplifier as a high level when the second RC sub-circuit is turned on, when the LOS signal output by the first limiting amplifier is a low level and the LOS signal output by the second limiting amplifier is a high level, the logic control circuit controls the first RC sub-circuit to be turned on; when the LOS signal output by the first limiting amplifier is a high level and the LOS signal output by the second limiting amplifier is a low level, the logic control circuit controls the second RC sub-circuit to be turned on. In the present application, the logic control circuit selects the first RC sub-circuit or the second RC sub-circuit to be turned on through the LOS signal output by the first limiting amplifier and the second limiting amplifier, so as to achieve an accurate match between the transmission rate of the input optical signal and the bandwidth selected by the parameters of the first RC sub-circuit or the second RC sub-circuit, thereby improving the signal transmission quality and the receiving sensitivity of the optical module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a schematic diagram of the electrical connection relationship of the optical communication terminal;

[0019] Figure 2 It is a schematic diagram of the structure of an optical network terminal;

[0020] Figure 3 A schematic diagram of the structure of an optical module provided in an embodiment of the present application;

[0021] Figure 4 Provide a schematic diagram of the decomposed structure of the optical module for the embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of an optical transceiver sub-module and a circuit board provided in an embodiment of the present application;

[0023] Figure 6 A circuit schematic diagram provided for an embodiment of the present application;

[0024] Figure 7 Another circuit schematic diagram provided for an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] One of the core links of fiber-optic communication is the conversion between optical and electrical signals. Fiber-optic communication uses optical signals carrying information to transmit in optical fiber / optical waveguide and other information transmission equipment. The passive transmission characteristics of light in optical fiber / optical waveguide can achieve low-cost and low-loss information transmission; while information processing equipment such as computers use electrical signals. In order to establish an electrical information connection between information transmission equipment such as optical fiber / optical waveguide and information processing equipment such as computers, it is necessary to achieve the conversion between electrical signals and optical signals.

[0027] Optical modules realize the above-mentioned mutual conversion function of optical and electrical signals in the field of optical fiber communication technology. The mutual conversion of optical signals and electrical signals is the core function of optical modules. Optical modules realize electrical connection with external host computers through the gold fingers on their internal circuit boards. The main electrical connections include power supply, I2C signals, data signals and grounding. Optical modules realize photoelectric connection with external optical fibers through optical interfaces. There are many ways to connect external optical fibers, which have derived various types of optical fiber electrical connectors. Using gold fingers at electrical interfaces to realize electrical connection has become the mainstream electrical connection method in the optical module industry. Based on this, the definition of pins on gold fingers has formed various industry protocols / specifications. The photoelectric connection method realized by optical interfaces and optical fiber electrical connectors has become the mainstream electrical connection method in the optical module industry. Based on this, optical fiber electrical connectors have also formed various industry standards, such as LC interfaces, SC interfaces, MPO interfaces, etc. The optical interfaces of optical modules have also made adaptive structural designs for optical fiber electrical connectors. Therefore, there are various types of optical fiber adapters set at the optical interfaces.

[0028] Figure 1 Figure 1 is a schematic diagram of the electrical connection relationship of the optical communication terminal. Figure 1 As shown, the electrical connection of the optical communication terminal mainly includes the mutual electrical connection between the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

[0029] One end of the optical fiber 101 is electrically connected to the remote server, and one end of the network cable 103 is electrically connected to the local information processing device. The electrical connection between the local information processing device and the remote server is completed by the electrical connection between the optical fiber 101 and the network cable 103; and the electrical connection between the optical fiber 101 and the network cable 103 is completed by the optical network terminal 100 with the optical module 200.

[0030] The optical interface of the optical module 200 is connected to the optical fiber 101 to establish a bidirectional optical signal electrical connection with the optical fiber 101; the electrical interface of the optical module 200 is connected to the optical network terminal 100 to establish a bidirectional electrical signal electrical connection with the optical network terminal 100; bidirectional mutual conversion between optical signals and electrical signals is realized inside the optical module, thereby establishing an information electrical connection between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber 101 is converted into an electrical signal by the optical module and then input into the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input into the optical fiber 101.

[0031] The optical network terminal has an optical module interface 102, which is used to access the optical module 200 and establish a bidirectional electrical signal connection with the optical module 200; the optical network terminal has a network cable interface 104, which is used to access the network cable 103 and establish a bidirectional electrical signal connection with the network cable 103 (generally an electrical signal of the Ethernet protocol, which belongs to a different protocol / type from the electrical signal used by the optical module); the optical module 200 and the network cable 103 are electrically connected through the optical network terminal 100. Specifically, the optical network terminal transmits the signal from the optical module to the network cable, and transmits the signal from the network cable to the optical module. The optical network terminal monitors the operation of the optical module as the upper computer of the optical module. The optical network terminal is the upper computer of the optical module, providing data signals to the optical module and receiving data signals from the optical module. At this point, the remote server establishes a bidirectional signal transmission channel with the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

[0032] Common local information processing devices include routers, home switches, electronic computers, etc.; common optical network terminals include optical network units ONU, optical line terminals OLT, data center servers, data center switches, etc.

[0033] Figure 2 Figure 1 is a schematic diagram of the optical network terminal structure. Figure 2 As shown, the optical network terminal 100 has a circuit board 105, and a cage 106 is arranged on the surface of the circuit board 105; an electrical connector is arranged inside the cage 106 for accessing the electrical interface (such as gold fingers, etc.) of the optical module; a heat sink 107 is arranged on the cage 106, and the heat sink 107 has protrusions such as fins that increase the heat dissipation area.

[0034] The optical module 200 is inserted into the optical network terminal, the electrical interface of the optical module is inserted into the electrical connector inside the cage 106 , and the optical interface of the optical module is electrically connected to the optical fiber 101 .

[0035] The cage 106 is located on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged inside the cage; the optical module is inserted into the cage, and the cage fixes the optical module, and the heat generated by the optical module is conducted to the cage 106, and then diffused through the heat sink 107 on the cage.

[0036] Figure 3 A schematic diagram of the structure of an optical module provided in an embodiment of the present application. Figure 4 A schematic diagram of the decomposed structure of an optical module is provided for an embodiment of the present application. Figure 5 This is a schematic diagram of the structure of the optical transceiver sub-module and the circuit board provided in the embodiment of the present application. Figure 3-5 As shown, the optical module 200 provided in the embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking component 203, a circuit board 300 and an optical transceiver sub-module 400;

[0037] The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body. Specifically, the lower shell includes a main board and two side panels located on both sides of the main board and perpendicular to the main board; the upper shell includes a cover plate, which is covered on the two side panels of the upper shell to form a wrapping cavity; the upper shell may also include two side walls located on both sides of the cover plate and perpendicular to the cover plate, and the two side walls are combined with the two side panels to achieve the upper shell covering the lower shell.

[0038] The two openings can specifically be two openings (204, 205) located at the same end of the optical module, or two openings at different ends of the optical module; one of the openings is an electrical interface 204, and the gold fingers of the circuit board extend from the electrical interface 204 and are inserted into a host computer such as an optical network terminal; the other opening is an optical interface 205, which is used to electrically connect to an external optical fiber electrical connector (external optical fiber); optoelectronic devices such as the circuit board 300, the optical transmitting submodule 301 and the optical receiving submodule 400 are located in the encapsulating cavity.

[0039] The upper shell and the lower shell are combined to facilitate installation of components such as the circuit board 300, the optical transmitting submodule 301 and the optical receiving submodule 400 into the shell. The upper shell and the lower shell form the outermost packaging protection shell of the optical module. The upper shell and the lower shell are generally made of metal materials, which is conducive to electromagnetic shielding and heat dissipation. The shell of the optical module is generally not made into an integrated component, and an integrated shell is not conducive to the assembly of components inside the shell.

[0040] The unlocking component 203 is located on the outer wall of the cavity / lower shell 202 and is used to realize the fixed electrical connection between the optical module and the host computer, or to release the fixed electrical connection between the optical module and the host computer.

[0041] The unlocking component 203 has a locking component that matches the cage of the host computer; pulling the end of the unlocking component can make the unlocking component move relatively on the surface of the outer wall; the optical module is inserted into the cage of the host computer, and the locking component of the unlocking component fixes the optical module in the cage of the host computer; by pulling the unlocking component, the locking component of the unlocking component moves accordingly, thereby changing the electrical connection relationship between the locking component and the host computer, so as to release the locking relationship between the optical module and the host computer, so that the optical module can be pulled out of the cage of the host computer.

[0042] The circuit board 300 is located in a cavity formed by the upper part and the shell, and is provided with circuit wiring, electronic components (such as capacitors, resistors, transistors, MOS tubes) and chips (such as MCU, laser driver chip, limiting amplifier chip, clock data recovery CDR, power management chip, data processing chip DSP), etc.

[0043] The circuit board 300 connects the electrical components in the optical module together according to the circuit design through circuit routing to achieve electrical functions such as power supply, electrical signal transmission and grounding.

[0044] The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize the load-bearing function. For example, the rigid circuit board can stably carry the chip; when the optical transceiver device is located on the circuit board, the rigid circuit board can also provide stable load-bearing; the rigid circuit board can also be inserted into the electrical connector in the upper computer cage. Specifically, a metal pin / gold finger is formed on the end surface of one side of the rigid circuit board for connecting to the electrical connector; these are not easy to achieve with flexible circuit boards.

[0045] Flexible circuit boards are also used in some optical modules as a supplement to rigid circuit boards. Flexible circuit boards are generally used in conjunction with rigid circuit boards. For example, flexible circuit boards can be used to connect rigid circuit boards to optical transceiver devices.

[0046] The end surface of the circuit board 300 is provided with a gold finger, which is composed of independent pins. The circuit board is inserted into the electrical connector in the cage, and the electrical connection is established between the gold finger and the snap-on spring in the electrical connector. The gold finger can be set on only one side of the circuit board. Considering the large number of pins required, gold fingers are generally set on the upper and lower surfaces of the circuit board. The gold finger is used to establish an electrical connection with the host computer. The specific electrical connection can be power supply, grounding, I2C signal, communication data signal, etc.

[0047] The optical transceiver submodule 400 is located in a cavity formed by an upper shell and a lower shell, and includes a round square tube 401, an optical transmitter 402, an optical receiver 403 and optical components. Specifically,

[0048] The square tube body 401 is used to carry and fix the optical transmitter 402, the optical receiver 403 and the optical components. The square tube body 401 is generally made of metal material, which is conducive to electromagnetic shielding and heat dissipation. The square tube body 401 is provided with a first nozzle, a second nozzle and a third nozzle. Usually, the first nozzle and the second nozzle are respectively arranged on adjacent side walls of the square tube body 401. Preferably, the first nozzle is arranged on the side wall of the square tube body 401 in the length direction, and the second nozzle and the third nozzle are arranged on the side wall of the square tube body 401 in the width direction.

[0049] The two light emitters 402 are respectively embedded in the first tube opening and the second tube opening, and the light emitters 402 are in thermal contact with the round square tube body 401 through the first tube opening and the second tube opening; the light receiver 403 is embedded in the third tube opening, and is in thermal contact with the round square tube body 401 through the third tube opening. Optionally, the light emitter 402 and the light receiver 403 are directly pressed into the round square tube body 401, and the round square tube body 401 is in direct contact with the light emitter 402 and the light receiver 403 or through a heat-conducting medium. In this way, the round square tube body 401 can be used for heat dissipation of the light emitter 402 and the light receiver 403, ensuring the heat dissipation effect of the light emitter 402 and the light receiver 403.

[0050] The optical transmitter 402 is a laser transmitter with a single LD chip. Therefore, the optical transmitter 402 is used to transmit two lasers of different wavelengths, that is, the optical transmitter 402 accommodates optical signals of two optical paths in a single TOCAN (coaxial package). The optical transmitter 402 is connected to the circuit board 300 through a flexible circuit board.

[0051] The optical receiver 403 is a laser receiver with a single PD chip. Therefore, the optical receiver 403 is used to receive two lasers of different wavelengths, that is, the optical receiver 403 accommodates optical signals of two optical paths in a single TOCAN (coaxial package). The optical receiver 403 is connected to the circuit board 300 through a flexible circuit board.

[0052] The optical component is disposed in the inner cavity of the round square tube 401, and is used to adjust the laser emitted by the optical transmitter 402 and the laser incident on the optical receiver 403. The optical component generally includes an optical lens (such as an optical collimating lens, an optical coupling lens), a combiner / demultiplexer, etc., which are used to collimate and adjust the optical path, optimize the optical fiber coupling state, and improve the coupling efficiency.

[0053] Figure 6 A circuit schematic diagram provided in an embodiment of the present application. Figure 5-6 As shown, in the embodiment of the present application, the optical receiver 403 is provided with a partial structure of a photoelectric conversion component 4031 and a transimpedance amplifier component 4032. The circuit board 300 is provided with a logic control circuit 40323 and a limiting amplifier circuit 301 on the surface. Specifically,

[0054] The photoelectric conversion component 4031 is used to convert the optical signal into a current signal. Specifically, the photoelectric conversion component 4031 includes a photodetector. The photodetector is used to convert the received optical signal into a current signal.

[0055] The transimpedance amplifier component 4032 includes an RC circuit 40321, an operational amplifier 40322, and a logic control circuit 40323. The RC circuit 40321 and the operational amplifier 40322 are both located in the optical receiver 403. Specifically,

[0056] The RC circuit (resistor-capacitance circuit) 40321 includes a first RC sub-circuit 403211 and a second RC sub-circuit 403212. The first end of the first RC sub-circuit 403211 is electrically connected to the first end of the second RC sub-circuit 403212, and the second end of the first RC sub-circuit 403211 is electrically connected to the second end of the second RC sub-circuit 403212. That is, the first RC sub-circuit 403211 and the second RC sub-circuit 403212 are connected in parallel.

[0057] The first RC subcircuit 403211 includes a first feedback resistor and a first feedback capacitor. The first feedback resistor has a first end electrically connected to the reverse input end of the operational amplifier 40322 and the first end of the first feedback capacitor, and a second end electrically connected to the output end of the operational amplifier 40322 and the second end of the first feedback capacitor, that is, the first feedback resistor and the first feedback capacitor are connected in parallel.

[0058] The second RC subcircuit 403212 includes a second feedback resistor and a second feedback capacitor. The first end of the second feedback resistor is electrically connected to the reverse input end of the operational amplifier 40322 and the first end of the second feedback capacitor, and the second end is electrically connected to the output end of the operational amplifier 40322 and the second end of the second feedback capacitor, that is, the second feedback resistor and the second feedback capacitor are connected in parallel.

[0059] The operational amplifier 40322 has a reverse input terminal electrically connected to the photoelectric conversion component 4031 and the first terminal of the RC circuit 40321, respectively, a forward input terminal grounded, and an output terminal electrically connected to the second terminal of the RC circuit 40321. Since the first terminal of the RC circuit 40321 is the first terminal of the first RC sub-circuit 403211 or the second RC sub-circuit 403212, and the second terminal of the RC circuit 40321 is the second terminal of the first RC sub-circuit 403211 or the second RC sub-circuit 403212, the reverse input terminal of the operational amplifier 40322 is electrically connected to the first terminal of the first RC sub-circuit 403211 or the second RC sub-circuit 403212, and the output terminal of the operational amplifier 40322 is electrically connected to the second terminal of the first RC sub-circuit 403211 or the second RC sub-circuit 403212.

[0060] The current signal output by the photoelectric conversion component 4031 is input via the reverse input terminal of the operational amplifier 40322 . Under the action of the operational amplifier 40322 , the current signal is converted into a first voltage signal and output via the output terminal of the operational amplifier 40322 .

[0061] The limiting amplifier circuit 301 can be arranged on the upper surface of the circuit board 300, that is, it is located on the same surface of the circuit board 300 as the logic control circuit 40323; it can also be arranged on the lower surface of the circuit board 300, that is, it is located on a different surface of the circuit board 300 from the logic control circuit 40323. Since the devices between the upper surfaces of the circuit board 300 are connected by wire bonding, when the limiting amplifier circuit 301 is arranged on the upper surface of the circuit board 300, the limiting amplifier circuit 301 and the logic control circuit 40323 are connected by wire bonding. In addition, since a through hole is arranged between the upper surface of the circuit board 300 and the lower surface of the circuit board 300, the wire connects the upper surface of the circuit board 300 and the lower surface of the circuit board 300 through the through hole. When the limiting amplifier circuit 301 is arranged on the lower surface of the circuit board 300, the wire of the limiting amplifier circuit 301 and the logic control circuit 40323 are connected through the through hole.

[0062] The limiting amplifier circuit 301 has a first end electrically connected to the output end of the operational amplifier 40322, and a second end electrically connected to the second end of the logic control circuit 40323. The limiting amplifier circuit 301 includes a first limiting amplifier 3011 and a second limiting amplifier 3012. The first end of the first limiting amplifier 3011 is electrically connected to the first end of the second limiting amplifier 3012, and the second end of the first limiting amplifier 3011 is electrically connected to the second end of the second limiting amplifier 3012, that is, the first limiting amplifier 3011 and the second limiting amplifier 3012 are connected in parallel. The first limiting amplifier 3011 outputs a first LOS signal, and the second limiting amplifier 3012 outputs a second LOS signal. Among them, the LOS signal (Loss of Signal Alarm, signal loss warning) is an output indication signal. When there is no light, the LOS signal is a high level; when there is light, the LOS signal is a low level. When the first LOS signal is at a low level, the transmission rate of the input optical signal corresponds to the bandwidth selected by the first RC subcircuit parameters; when the second LOS signal is at a low level, the transmission rate of the input optical signal corresponds to the bandwidth selected by the second RC subcircuit parameters.

[0063] The logic control circuit 40323 has a first end electrically connected to the output end of the operational amplifier 40322 and the second end of the RC circuit 40321, respectively, and is used to select the first RC sub-circuit 403211 or the second RC sub-circuit 403212 to be turned on according to the LOS signal output by the limiting amplifier circuit 301. Since the first end of the logic control circuit 40323 is electrically connected to the first RC sub-circuit 403211 and the second RC sub-circuit 403212, respectively, and the second end is electrically connected to the first limiting amplifier 3011 and the second limiting amplifier 3012, respectively, the logic control circuit 40323 can control the first RC sub-circuit 403211 or the second RC sub-circuit 403212 to be turned on according to the first LOS signal output by the first limiting amplifier 3011 and the second LOS signal output by the second limiting amplifier 3012.

[0064] Since the transmission rate of the optical signal when the first RC sub-circuit 403211 is turned on corresponds to the LOS signal output by the first limiting amplifier 3011 being at a low level, and the transmission rate of the optical signal when the second RC sub-circuit 403212 is turned on corresponds to the LOS signal output by the first limiting amplifier 3011 being at a high level, when the LOS signal output by the first limiting amplifier 3011 is at a low level and the LOS signal output by the second limiting amplifier 3012 is at a high level, the logic control circuit 40323 controls the first RC sub-circuit 403211 to be turned on; when the LOS signal output by the first limiting amplifier 3011 is at a high level and the LOS signal output by the second limiting amplifier 3012 is at a low level, the logic control circuit 40323 controls the second RC sub-circuit 403212 to be turned on.

[0065] The logic control circuit 40323 selects the first RC sub-circuit 403211 or the second RC sub-circuit 403212 to be turned on through the LOS signal output by the first limiting amplifier 3011 and the second limiting amplifier 3012, so as to achieve an accurate match between the transmission rate of the input optical signal and the bandwidth selected by the first RC sub-circuit 403211 or the second RC sub-circuit 403212, thereby improving the receiving sensitivity of the optical module.

[0066] like Figure 5-6 As shown, in the embodiment of the present application, the transimpedance amplifier component 4032 further includes a low-pass filter circuit 40324. Specifically,

[0067] The low-pass filter circuit 40324 is disposed on the surface of the circuit board 300 , and includes a first low-pass filter sub-circuit 403241 and a second low-pass filter sub-circuit 403242 .

[0068] The first low-pass filter sub-circuit 403241 has a first end electrically connected to the output end of the operational amplifier 40322 and the first end of the second low-pass filter sub-circuit 403242 , and a second end electrically connected to the first end of the first limiting amplifier 3011 and the second end of the second low-pass filter sub-circuit 403242 .

[0069] Since the first low-pass filtering sub-circuit 403241 and the second low-pass filtering sub-circuit 403242 are both used to filter out high-frequency voltage signals, after filtering by the first low-pass filtering sub-circuit 403241 or the second low-pass filtering sub-circuit 403242, the first voltage signal becomes a second voltage signal, and the second voltage signal has less high-frequency voltage signals than the first voltage signal.

[0070] The logic control circuit 40323 may also be used to select the first low-pass filter sub-circuit 403241 or the second low-pass filter sub-circuit 403242 to be turned on according to the LOS signals output by the first limiting amplifier 3011 and the second limiting amplifier 3012 .

[0071] The first RC subcircuit 403211, the first low-pass filter subcircuit 403241 and the first limiting amplifier 3011 may correspond, and the second RC subcircuit 403212, the second low-pass filter subcircuit 403242 and the second limiting amplifier 3012 may correspond. When the first LOS signal output by the first limiting amplifier 3011 is at a low level, the logic control circuit 40323 controls the first RC subcircuit 403211 to be turned on, and also controls the first low-pass filter subcircuit 403241 to be turned on. Similarly, when the second LOS signal output by the second limiting amplifier 3012 is at a low level, the logic control circuit 40323 controls the second RC subcircuit 403212 to be turned on, and also controls the second low-pass filter subcircuit 403242 to be turned on.

[0072] Figure 7 Another circuit schematic diagram provided in the embodiment of the present application. Figure 5 and 7 As shown, in the embodiment of the present application, the RC circuit 40321 further includes a third RC sub-circuit 403213. Specifically,

[0073] The third RC subcircuit 403213 has a first end electrically connected to the first end of the first RC subcircuit or the second RC subcircuit, and a second end electrically connected to the second end of the first RC subcircuit or the second RC subcircuit, that is, the third RC subcircuit 403213 is connected in parallel with the first RC subcircuit and the second RC subcircuit, respectively.

[0074] like Figure 5 and 7 As shown, in the embodiment of the present application, the low-pass filter circuit 40324 further includes a third low-pass filter sub-circuit 403243. Specifically,

[0075] The third low-pass filter subcircuit 403243 has a first end electrically connected to the first low-pass filter subcircuit 403241 or the first end of the second low-pass filter subcircuit 403242, and a second end electrically connected to the second end of the first low-pass filter subcircuit 403241 or the second low-pass filter subcircuit 403242. That is, the third low-pass filter subcircuit 403243 is connected in parallel with the first low-pass filter subcircuit 403241 or the second low-pass filter subcircuit 403242, respectively.

[0076] like Figure 5 and 7 As shown, in the embodiment of the present application, the limiting amplifier circuit 301 further includes a third limiting amplifier 3013. Specifically,

[0077] The third limiting amplifier circuit 3013 has a first end electrically connected to the first limiting amplifier 3011 or the first end of the second limiting amplifier 3012, and a second end electrically connected to the second end of the first limiting amplifier 3011 or the second limiting amplifier 3012. That is, the third limiting amplifier 3013 is connected in parallel with the first limiting amplifier 3011 or the second limiting amplifier 3012, respectively.

[0078] The third RC subcircuit 403213, the third low-pass filter subcircuit 403243 and the second limiting amplifier 3013 correspond. When the third LOS signal output by the third limiting amplifier 3013 is at a low level, the logic control circuit 40323 controls the third RC subcircuit 403213 to be turned on, and also controls the third low-pass filter subcircuit 403243 to be turned on.

[0079] In the embodiment of the present application, the RC circuit 40321 can be provided with N RC sub-circuits, the corresponding low-pass filter circuit 40324 can also be provided with N low-pass filter sub-circuits, and the limiting amplifier circuit 301 can also be provided with N limiting amplifiers. The logic control circuit 40323 can control the corresponding RC sub-circuit and the low-pass filter sub-circuit to be turned on according to the LOS signal output by the limiting amplifier circuit 301.

[0080] The present application provides an optical module, including a circuit board and an optical transceiver submodule electrically connected to the circuit board. The optical transceiver submodule includes an optical receiver. An optoelectronic conversion component, an operational amplifier and an RC circuit are arranged in the optical receiver. The operational amplifier, the reverse input end is electrically connected to the optoelectronic conversion component and the first end of the RC circuit respectively, the forward input end is grounded, and the output end is electrically connected to the second end of the RC circuit. The RC circuit includes a first RC subcircuit and a second RC subcircuit. The first RC subcircuit, the first end is electrically connected to the first end of the second RC subcircuit, and the second end is electrically connected to the second end of the second RC subcircuit. A logic control circuit and a limiting amplifier circuit are arranged on the surface of the circuit board. The logic control circuit, the first end is electrically connected to the output end of the operational amplifier and the second end of the RC circuit respectively, and the second end is electrically connected to the second end of the limiting amplifier circuit, for selecting the first RC subcircuit or the second RC subcircuit to be turned on according to the LOS signal output by the limiting amplifier circuit. The limiting amplifier circuit, the first end is electrically connected to the output end of the operational amplifier, and includes a first limiting amplifier and a second limiting amplifier. A first limiting amplifier, the first end is electrically connected to the first end of the second limiting amplifier, and the second end is electrically connected to the second end of the second limiting amplifier. Since the transmission rate of the optical signal corresponds to the LOS signal output by the first limiting amplifier as a low level when the first RC sub-circuit is turned on, and the transmission rate of the optical signal corresponds to the LOS signal output by the first limiting amplifier as a high level when the second RC sub-circuit is turned on, when the LOS signal output by the first limiting amplifier is a low level and the LOS signal output by the second limiting amplifier is a high level, the logic control circuit controls the first RC sub-circuit to be turned on; when the LOS signal output by the first limiting amplifier is a high level and the LOS signal output by the second limiting amplifier is a low level, the logic control circuit controls the second RC sub-circuit to be turned on. In the present application, the logic control circuit selects the first RC sub-circuit or the second RC sub-circuit to be turned on through the LOS signal output by the first limiting amplifier and the second limiting amplifier, so as to achieve an accurate match between the transmission rate of the input optical signal and the bandwidth selected by the parameters of the first RC sub-circuit or the second RC sub-circuit, thereby improving the signal transmission quality and the receiving sensitivity of the optical module.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical module, characterized in that: include: Circuit boards; an optical transceiver submodule, including an optical receiver, electrically connected to the circuit board; The optical receiver is provided with a photoelectric conversion component, an operational amplifier and an RC circuit; The operational amplifier has a reverse input terminal electrically connected to the photoelectric conversion component and the first terminal of the RC circuit respectively, a forward input terminal electrically connected to the ground, and an output terminal electrically connected to the second terminal of the RC circuit; The RC circuit comprises a first RC sub-circuit and a second RC sub-circuit; The first RC sub-circuit has a first end electrically connected to the first end of the second RC sub-circuit, and a second end electrically connected to the second end of the second RC sub-circuit; The circuit board has a logic control circuit and a limiting amplifier circuit arranged on its surface; The logic control circuit has a first end electrically connected to the output end of the operational amplifier and the second end of the RC circuit respectively, and a second end electrically connected to the second end of the limiting amplifier circuit, and is used to select the first RC sub-circuit or the second RC sub-circuit to be turned on according to the LOS signal output by the limiting amplifier circuit; The limiting amplifier circuit has a first end electrically connected to the output end of the operational amplifier, and includes a first limiting amplifier and a second limiting amplifier; The first limiting amplifier has a first end electrically connected to the first end of the second limiting amplifier, and a second end electrically connected to the second end of the second limiting amplifier.

2. The optical module according to claim 1, characterized in that: A low-pass filter circuit is also arranged on the surface of the circuit board; The low-pass filter circuit comprises a first low-pass filter sub-circuit and a second low-pass filter sub-circuit; The first low-pass filter subcircuit has a first end electrically connected to the output end of the operational amplifier and the first end of the second low-pass filter subcircuit, and a second end electrically connected to the first end of the first limiting amplifier and the second end of the second low-pass filter subcircuit.

3. The optical module according to claim 2, characterized in that: The logic control circuit is further used to select the first low-pass filter sub-circuit or the second low-pass filter sub-circuit to be turned on according to the LOS signal output by the limiting amplifier circuit.

4. The optical module according to claim 2, characterized in that: The RC circuit further includes a third RC sub-circuit; The third RC sub-circuit has a first end electrically connected to the first end of the first RC sub-circuit, and a second end electrically connected to the second end of the first RC sub-circuit and the third low-pass filter sub-circuit.

5. The optical module according to claim 2, characterized in that: The low-pass filter circuit further includes a third low-pass filter sub-circuit; The third low-pass filter sub-circuit has a first end electrically connected to the first end of the first low-pass filter sub-circuit, and a second end electrically connected to the second end of the first low-pass filter sub-circuit.

6. The optical module according to claim 1, characterized in that: The first RC sub-circuit includes a first feedback resistor and a first feedback capacitor; The first feedback resistor has a first end electrically connected to the reverse input end of the operational amplifier and the first end of the first feedback capacitor, and a second end electrically connected to the output end of the operational amplifier and the second end of the first feedback capacitor.

7. The optical module according to claim 6, characterized in that: The second RC sub-circuit includes a second feedback resistor and a second feedback capacitor; The second feedback resistor has a first end electrically connected to the reverse input terminal of the operational amplifier, the first end of the first feedback resistor, and the first end of the second feedback capacitor, and a second end electrically connected to the output terminal of the operational amplifier, the second end of the first feedback resistor, and the second end of the second feedback capacitor.

8. The optical module according to claim 1, characterized in that: The photoelectric conversion component includes a photodetector.

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