Optical module
By integrating a signal source, clock data recovery unit, and phase-locked loop into the optical module, the same-source clock driving of the optical signal is realized, solving the problem of conveniently obtaining a reference clock and improving the efficiency and accuracy of optical signal measurement.
Patent Information
- Application Number
- CN202520538248.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-25
AI Technical Summary
In optical communication technology, how to conveniently obtain a reference clock for the transmitted optical signal in order to measure its quality is an urgent problem to be solved.
An optical module was designed, comprising a circuit board, a signal source, a DSP chip, a clock data recovery unit, and a phase-locked loop. The high-frequency electrical signal output by the signal source is used to recover the clock signal through the clock data recovery unit, which directly drives the phase-locked loop to generate an optical signal. A clock from the same source is used as a reference clock to assist in measuring the quality of the optical signal.
This reduces the process of extracting a reference clock from the optical signal, improving the efficiency and accuracy of measuring the optical signal.
Smart Images
Figure CN223827865U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of optical fiber communication technology, and in particular to an optical module. Background Technology
[0002] With the development of new business and application models such as cloud computing, mobile internet, and video, advancements in optical communication technology have become increasingly important. In optical communication technology, the optical module, as one of the key components in optical communication equipment, enables photoelectric signal conversion; and in the development of optical communication technology, the data transmission rate of optical modules is required to continuously improve.
[0003] To ensure the performance of optical modules, it is often necessary to measure the quality of optical signals, such as the quality of transmitted optical signals. When measuring the quality of transmitted optical signals, it is often necessary to obtain a reference clock for the transmitted optical signal. How to conveniently obtain a reference clock for the transmitted optical signal is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0004] In some embodiments, an optical module is provided that facilitates the extraction of a reference clock to make it easier to measure the quality of the transmitted optical signal.
[0005] Some embodiments provide an optical module, including:
[0006] The circuit board has a signal source and a DSP chip on its surface; the signal source includes a first output terminal and a second output terminal, the first output terminal of the signal source is used to output a high-frequency electrical signal, and the second output terminal of the signal source is used to output a reference clock;
[0007] A light-emitting component used to generate light signals;
[0008] The DSP chip includes:
[0009] A clock data recovery unit, with its input connected to the first output of the signal source;
[0010] The phase-locked loop has its input terminal connected to the output terminal of the clock data recovery unit, and its output terminal connected to the optical emitting component.
[0011] One of the above technical solutions has the following advantages or beneficial effects: The optical module includes a circuit board and an optical emitting component electrically connected to the circuit board. A signal source and a DSP chip are disposed on the circuit board. The signal source includes a first output terminal and a second output terminal. The first output terminal of the signal source is used to output a high-frequency electrical signal, and the second output terminal of the signal source is used to output a reference clock. The DSP chip encapsulates a clock data recovery unit and a phase-locked loop (PLL). The input terminal of the clock data recovery unit is connected to the first output terminal of the signal source, the input terminal of the PLL is connected to the output terminal of the clock data recovery unit, and the output terminal of the PLL is connected to the optical emitting component. The high-frequency electrical signal output by the signal source is used to recover a clock signal via the clock data recovery unit, which is directly fed to the PLL. The PLL drives the optical emitting component to generate an optical signal based on the high-frequency electrical signal including the clock signal. This optical signal can be directly transmitted to a measuring device. The clock of this optical signal and the reference clock output by the signal source are from the same source. The reference clock output by the signal source can be used as a reference clock for measuring the optical signal, thereby assisting in the measurement of the optical signal, reducing the process of extracting a reference clock from the optical signal, and facilitating the improvement of the efficiency of measuring the optical signal.
[0012] In some embodiments, an optical module is provided in which the first output of the clock data recovery unit is connected to the second input of the phase-locked loop;
[0013] The DSP chip also includes a frequency-locked loop and a crystal oscillator. The input terminal of the frequency-locked loop is connected to the second output terminal of the clock data recovery unit, the output terminal of the frequency-locked loop is connected to the first input terminal of the phase-locked loop, and the output terminal of the crystal oscillator is connected to the second input terminal of the phase-locked loop.
[0014] Another technical solution described above has the following advantages or beneficial effects: the DSP chip also encapsulates a frequency-locked loop (PLL) and a crystal oscillator. The input of the PLL is connected to the output of the clock data recovery unit, and the output of the PLL is connected to the first input of the phase-locked loop (PLL). The PLL can reference the clock signal of the crystal oscillator and complete clock tracking of the clock data recovery unit through the PLL, which facilitates maintaining the limit independence and dynamic balance of the transmitted and received optical signals.
[0015] In some embodiments, an optical module is provided, wherein the phase-locked loop (PLL) includes a first PLL, a second PLL, a third PLL, and a fourth PLL; a first input terminal of the first PLL is connected to a first output terminal of the frequency-locked loop (FLL), a first input terminal of the second PLL is connected to a second output terminal of the FLL, a first input terminal of the third PLL is connected to a third output terminal of the FLL, and a first input terminal of the fourth PLL is connected to a fourth output terminal of the FLL.
[0016] The second input terminals of the first phase-locked loop, the second input terminal of the second phase-locked loop, the second input terminal of the third phase-locked loop, and the second input terminal of the fourth phase-locked loop are respectively connected to the crystal oscillator;
[0017] The light emitting component includes channels 1, 2, 3 and 4. The first output terminal of the first phase-locked loop is connected to channel 1, the second output terminal of the first phase-locked loop is connected to channel 2, the third output terminal of the first phase-locked loop is connected to channel 3, and the fourth output terminal of the phase-locked loop is connected to channel 4.
[0018] Another technical solution in the above-mentioned technical solution has the following advantages or beneficial effects: When the output terminal of the clock data recovery unit is connected to the third input terminal of the first phase-locked loop (PLL), the second output terminal of the first PLL can be connected to channel 2 of the optical emitting component, the third output terminal of the first PLL can be connected to channel 3 of the optical emitting component, and the fourth output terminal of the first PLL can be connected to channel 4 of the optical emitting component. When controlling the conduction of the output terminal of the clock data recovery unit and the third input terminal of the first PLL, the second output terminal of the first PLL and channels 1, 2, 3, and 4 of the optical emitting component are also controlled to be conducted, so that the first PLL is shared by each channel of the optical emitting component, the frequency-locked loop and the crystal oscillator are disconnected from the link, and the first PLL is directly bound to the frequency of the clock data recovery unit. The signal source outputs a high-frequency electrical signal and a reference clock. The high-frequency electrical signal is recovered by the clock data recovery unit and directly given to the first PLL. The first PLL drives the optical emitting component to generate an optical signal based on the high-frequency electrical signal including the clock signal. The optical signal can be directly transmitted to the measuring device. The clock of the optical signal and the reference clock output by the signal source are from the same source. The reference clock output by the signal source can be used as a reference clock for measuring the optical signal to assist in the measurement of the optical signal, reducing the process of extracting a reference clock from the optical signal and facilitating the improvement of the efficiency of measuring the optical signal.
[0019] Some embodiments provide an optical module, including:
[0020] The circuit board has a DSP chip mounted on its surface.
[0021] A light emitting component is electrically connected to the circuit board, and the light emitting component is used to generate light signals;
[0022] The DSP chip includes:
[0023] The signal source includes a first output terminal and a second output terminal. The first output terminal of the signal source is used to output a high-frequency electrical signal, and the second output terminal of the signal source is used to output a reference clock.
[0024] A clock data recovery unit, with its input connected to the first output of the signal source;
[0025] The phase-locked loop has its input connected to the clock data recovery unit and its output connected to the optical emitting component.
[0026] Another technical solution described above has the following advantages or beneficial effects: The optical module includes a circuit board and an optical emitting component electrically connected to the circuit board. A DSP chip is mounted on the circuit board. The DSP chip encapsulates a signal source, a clock data recovery unit, and a phase-locked loop (PLL). The signal source includes a first output terminal and a second output terminal. The first output terminal of the signal source is used to output a high-frequency electrical signal, and the second output terminal of the signal source is used to output a reference clock. The input terminal of the clock data recovery unit is connected to the first output terminal of the signal source, the input terminal of the PLL is connected to the output terminal of the clock data recovery unit, and the output terminal of the PLL is connected to the optical emitting component. The high-frequency electrical signal output by the signal source is used by the clock data recovery unit to recover a clock signal, which is directly fed to the PLL. The PLL drives the optical emitting component to generate an optical signal based on the high-frequency electrical signal including the clock signal. This optical signal can be directly transmitted to the measuring device, and the clock of this optical signal is the same as the reference clock output by the signal source. The reference clock output by the signal source can be used as a reference clock for measuring the optical signal to assist in the measurement of the optical signal, reducing the process of extracting a reference clock from the optical signal and facilitating the improvement of the efficiency of measuring the optical signal.
[0027] In some embodiments, an optical module is provided in which the first output of the clock data recovery unit is connected to the second input of the phase-locked loop;
[0028] The DSP chip also includes a frequency-locked loop and a crystal oscillator. The input terminal of the frequency-locked loop is connected to the second output terminal of the clock data recovery unit, the output terminal of the frequency-locked loop is connected to the first input terminal of the phase-locked loop, and the output terminal of the crystal oscillator is connected to the second input terminal of the phase-locked loop.
[0029] Another technical solution described above has the following advantages or beneficial effects: the DSP chip also encapsulates a frequency-locked loop (PLL) and a crystal oscillator. The input of the PLL is connected to the output of the clock data recovery unit, and the output of the PLL is connected to the first input of the phase-locked loop (PLL). The PLL can reference the clock signal of the crystal oscillator and complete clock tracking of the clock data recovery unit through the PLL, which facilitates maintaining the limit independence and dynamic balance of the transmitted and received optical signals.
[0030] Some embodiments provide an optical module, including:
[0031] The circuit board has a signal source and a DSP chip on its surface; the output terminal of the signal source is used to output a high-frequency electrical signal.
[0032] The light emitting component includes multiple channels, each of which is used to generate a light signal.
[0033] The DSP chip includes:
[0034] The clock data recovery unit has its input connected to the output of the signal source;
[0035] A frequency-locked loop, with its input terminal connected to the output terminal of the clock data recovery unit;
[0036] Multiple phase-locked loops (PLLs) are provided, with their first input terminals connected to the output terminals of the frequency-locked loops, and their first output terminals correspondingly connected to multiple channels of the optical emitting component.
[0037] The crystal oscillator's output is connected to the second input of multiple phase-locked loops.
[0038] The multiplexer has its input terminals connected to the fifth output terminals of multiple phase-locked loops, and its output terminals are used to output a reference clock.
[0039] Another technical solution described above has the following advantages or beneficial effects: The optical module includes a circuit board and an optical emitting component electrically connected to the circuit board. A signal source and a DSP chip are mounted on the circuit board. The output of the signal source is used to output a high-frequency electrical signal. The DSP chip encapsulates a clock data recovery unit, a frequency-locked loop (PLL), multiple phase-locked loops (PLLs), a crystal oscillator, and a multiplexer. The input of the clock data recovery unit is connected to the output of the signal source, and the output of the clock data recovery unit is connected to the PLL. Multiple outputs of the PLL are correspondingly connected to multiple PLLs, the output of the crystal oscillator is correspondingly connected to multiple PLLs, and multiple inputs of the multiplexer are correspondingly connected to the fifth output of multiple PLLs. The output of the multiplexer is used to output a reference clock. When it is necessary to measure the optical signal output from a certain channel of the optical emitting component, the fifth output of the corresponding PLL is controlled to be connected to the input of the multiplexer, so that the reference clock output by the multiplexer is from the same source as the clock of the optical signal output from that channel. Thus, by using the reference clock output by the multiplexer, which is from the same source as the clock of the corresponding optical signal, it is convenient to complete the measurement of the transmitted optical signal.
[0040] Some embodiments provide an optical module, including:
[0041] The circuit board has a signal source, a DSP chip, and a multiplexer on its surface; the output of the signal source is used to output a high-frequency electrical signal, and the output of the multiplexer is used to output a reference clock.
[0042] The light emitting component includes multiple channels, each of which is used to generate a light signal.
[0043] The DSP chip includes:
[0044] The clock data recovery unit has its input connected to the output of the signal source;
[0045] A frequency-locked loop, with its input terminal connected to the output terminal of the clock data recovery unit;
[0046] Multiple phase-locked loops (PLLs) are provided, with their first input terminals connected to the output terminals of the frequency-locked loops, their first output terminals corresponding to the multiple channels of the optical emitting component, and their fifth output terminals connected to the input terminals of the multiplexer.
[0047] The crystal oscillator's output is connected to the second input of multiple phase-locked loops.
[0048] Another technical solution described above has the following advantages or beneficial effects: The optical module includes a circuit board and an optical emitting component electrically connected to the circuit board. A signal source, a DSP chip, and a multiplexer are mounted on the circuit board. The output of the signal source is used to output a high-frequency electrical signal, and the output of the multiplexer is used to output a reference clock. The DSP chip encapsulates a clock data recovery unit, a frequency-locked loop (PLL), multiple phase-locked loops (PLLs), and a crystal oscillator. The input of the clock data recovery unit is connected to the output of the signal source, and the output of the clock data recovery unit is connected to the PLL. Multiple outputs of the PLL are correspondingly connected to multiple PLLs, the output of the crystal oscillator is correspondingly connected to multiple PLLs, and multiple inputs of the multiplexer are correspondingly connected to the fifth outputs of multiple PLLs. The output of the multiplexer is used to output a reference clock. When it is necessary to measure the optical signal output from a certain channel of the optical emitting component, the fifth output of the corresponding PLL is controlled to be connected to the input of the multiplexer, making the reference clock output by the multiplexer identical to the clock of the optical signal output from that channel. Thus, by using a reference clock output by the multiplexer that is identical to the clock of the corresponding optical signal, it is convenient to complete the measurement of the transmitted optical signal. Attached Figure Description
[0049] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.
[0050] Figure 1 This is a partial architecture diagram of an optical communication system according to some embodiments;
[0051] Figure 2 This is a partial structural diagram of a host computer according to some embodiments;
[0052] Figure 3 This is a structural diagram of an optical module according to some embodiments;
[0053] Figure 4 An exploded view of an optical module according to some embodiments;
[0054] Figure 5 This is an internal structural diagram of another optical module according to some embodiments;
[0055] Figure 6 Internal circuitry of an optical module according to some embodiments Figure 1 ;
[0056] Figure 7 A circuit diagram for extracting a reference clock according to some embodiments;
[0057] Figure 8 Internal circuitry of an optical module according to some embodiments Figure 2 ;
[0058] Figure 9 Internal circuitry of an optical module according to some embodiments Figure 3 ;
[0059] Figure 10 Internal circuitry of an optical module according to some embodiments Figure 4 . Detailed Implementation
[0060] The embodiments of this disclosure will now be described clearly and in detail with reference to the accompanying drawings. However, the described embodiments are merely some, and not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.
[0061] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and inclusive, meaning "including, but not limited to"; the terms "first" and "second" should not be construed as indicating or implying relative importance or indicating an upper limit on the number; the term "multiple" means two or more; the term "connection" should be interpreted broadly, for example, "connection" can be a fixed connection, a detachable connection, or an integral part, and can be a direct connection or an indirect connection through an intermediate medium; the use of the terms "applicable to" or "configured to" implies open and inclusive language, which does not exclude applicability to or configuration to devices performing additional tasks or steps; descriptions such as "parallel," "perpendicular," "identical," "consistent," and "aligned" are not limited to absolute mathematical theoretical relationships, but also include acceptable error ranges arising in practice, and differences based on the same design concept but due to manufacturing reasons.
[0062] In optical communication technology, to establish information transmission between information processing devices, information needs to be loaded onto light, and the propagation of light is used to transmit the information. Here, the light carrying the information is called an optical signal. When optical signals are transmitted in information transmission equipment, optical power loss can be reduced, thus enabling high-speed, long-distance, and low-cost information transmission. Information processing devices can recognize and process electrical signals. Information processing devices typically include optical network units (ONUs), gateways, routers, switches, mobile phones, computers, servers, tablets, televisions, etc., while information transmission equipment typically includes optical fibers and optical waveguides.
[0063] An optical module enables the conversion between optical and electrical signals between information processing and transmission devices. For example, at least one of the optical signal input or output ports of the optical module is connected to an optical fiber, and at least one of the electrical signal input or output ports is connected to an optical network terminal. A first optical signal from the optical fiber is transmitted to the optical module, which converts it into a first electrical signal and transmits it to the optical network terminal. A second electrical signal from the optical network terminal is transmitted to the optical module, which converts it into a second optical signal and transmits it back to the optical fiber. Since multiple information processing devices can transmit information via electrical signals, at least one of the devices needs to be directly connected to the optical module, rather than all devices. Here, the information processing device directly connected to the optical module is referred to as the host computer of the optical module. Furthermore, the optical signal input or output port of the optical module can be referred to as an optical port, and the electrical signal input or output port can be referred to as an electrical port.
[0064] Figure 1 This is a partial structural diagram of an optical communication system provided according to some embodiments of the present disclosure. Figure 1 As shown, the optical communication system mainly includes a remote information processing device 1000, a local information processing device 2000, a host computer 100, an optical module 200, an optical fiber 101, and a network cable 103.
[0065] One end of optical fiber 101 extends toward the remote information processing device 1000, and the other end of optical fiber 101 is connected to optical module 200 through the optical port of optical module 200. The optical signal can undergo total internal reflection in optical fiber 101, and the propagation of the optical signal in the direction of total internal reflection can almost maintain the original optical power. The optical signal undergoes multiple total internal reflections in optical fiber 101 to transmit the optical signal from the remote information processing device 1000 to optical module 200, or to transmit the optical signal from optical module 200 to remote information processing device 1000, thereby realizing long-distance, low-power loss information transmission.
[0066] The optical communication system may include one or more optical fibers 101, and the optical fibers 101 may be detachably or fixedly connected to the optical module 200. The host computer 100 is configured to provide data signals to the optical module 200, receive data signals from the optical module 200, or monitor or control the operating status of the optical module 200.
[0067] The host computer 100 includes a generally rectangular housing and an optical module interface 102 disposed on the housing. The optical module interface 102 is configured to connect to the optical module 200 so that the host computer 100 and the optical module 200 can establish a one-way or two-way electrical signal connection.
[0068] The host computer 100 also includes an external power interface that can connect to an electrical signal network. For example, this external power interface includes a Universal Serial Bus (USB) interface or a network cable interface 104, which is configured to connect a network cable 103 to establish a unidirectional or bidirectional electrical signal connection between the host computer 100 and the network cable 103. One end of the network cable 103 is connected to the local information processing device 2000, and the other end of the network cable 103 is connected to the host computer 100, thereby establishing an electrical signal connection between the local information processing device 2000 and the host computer 100 via the network cable 103. For example, a third electrical signal emitted by the local information processing device 2000 is transmitted to the host computer 100 via the network cable 103. The host computer 100 generates a second electrical signal based on the third electrical signal. This second electrical signal from the host computer 100 is transmitted to the optical module 200, which converts the second electrical signal into a second optical signal and transmits it to the optical fiber 101. The second optical signal is then transmitted in the optical fiber 101 to the remote information processing device 1000. Alternatively, a first optical signal from the remote information processing device 1000 propagates through the optical fiber 101 and is transmitted to the optical module 200. The optical module 200 converts the first optical signal into a first electrical signal and transmits it to the host computer 100. The host computer 100 generates a fourth electrical signal based on the first electrical signal and transmits the fourth electrical signal to the local information processing device 2000. It should be noted that an optical module is a tool for converting optical signals to electrical signals. During the conversion process, the information itself does not change, but the encoding and decoding methods can change.
[0069] In addition to optical network terminals, the host computer 100 also includes optical line terminals (OLTs), optical network equipment (ONTs), or data center servers.
[0070] Figure 2 This is a partial structural diagram of a host computer provided according to some embodiments of the present disclosure. To clearly show the connection relationship between the optical module 200 and the host computer 100, Figure 2 Only the structure of the host computer 100 related to the optical module 200 is shown. For example... Figure 2 As shown, the host computer 100 also includes a PCB circuit board 105 disposed within the housing, a cage 106 disposed on the surface of the PCB circuit board 105, a heat sink 107 disposed on the cage 106, and an electrical connector disposed inside the cage 106. The electrical connector is configured to connect to the electrical port of the optical module 200; the heat sink 107 has fins and other protruding structures to increase the heat dissipation area.
[0071] The optical module 200 is inserted into the cage 106 of the host computer 100, where it is secured. Heat generated by the optical module 200 is conducted to the cage 106 and then dissipated through the heat sink 107. After insertion into the cage 106, the optical module 200's electrical port connects to the electrical connector inside the cage 106, establishing a bidirectional electrical signal connection between the optical module 200 and the host computer 100. Furthermore, the optical port of the optical module 200 connects to the optical fiber 101, establishing a bidirectional optical signal connection between the optical module 200 and the optical fiber 101.
[0072] Figure 3 This is a structural diagram of an optical module provided according to some embodiments of the present disclosure. Figure 4 This is an exploded view of an optical module provided according to some embodiments of the present disclosure. Figure 3 and Figure 4 As shown, the optical module 200 includes a shell, a circuit board 300 disposed within the shell, a light emitting component 400, and a light receiving component 500. However, this disclosure is not limited thereto; in some embodiments, the optical module 200 includes one of the light emitting component 400 and the light receiving component 500.
[0073] The housing includes an upper housing 201 and a lower housing 202, with the upper housing 201 covering the lower housing 202 to form the aforementioned housing having two openings 203 and 204; the outer contour of the housing is generally square.
[0074] In some embodiments, the lower housing 202 includes a base plate 2021 and two lower side plates 2022 located on both sides of the base plate 2021 and perpendicular to the base plate 2021; the upper housing 201 includes an upper cover plate 2011, which covers the two lower side plates 2022 of the lower housing 202 to form the aforementioned housing.
[0075] In some embodiments, the lower housing 202 includes a base plate 2021 and two lower side plates 2022 located on both sides of the base plate 2021 and perpendicular to the base plate 2021. The upper housing 201 includes an upper cover plate 2011 and two upper side plates 2012 located on both sides of the upper cover plate 2011 and perpendicular to the upper cover plate 2011. The two upper side plates and the two lower side plates 2022 are combined to cover the lower housing 202 with the upper housing 201.
[0076] The direction of the line connecting the two openings 203 and 204 can be consistent with or inconsistent with the length direction of the optical module 200. For example, opening 203 is located at the end of the optical module 200. Figure 3 The opening 204 is located at the end of the optical module 200 (left end). Figure 3 (The right end). Alternatively, opening 203 is located at the end of optical module 200, while opening 204 is located on the side of optical module 200. Opening 203 is an electrical port, from which the end of circuit board 300 extends and is inserted into the electrical connector of host computer 100; opening 204 is an optical port, configured to connect to external optical fiber 101 so that optical fiber 101 connects optical emitting component 400 and optical receiving component 500 in optical module 200.
[0077] The assembly method using an upper housing 201 and a lower housing 202 facilitates the installation of the circuit board 300, the light emitting component 400, the light receiving component 500, etc., into the aforementioned housings. The upper housing 201 and the lower housing 202 can encapsulate and protect these devices. Furthermore, when assembling the circuit board 300, the light emitting component 400, the light receiving component 500, etc., the assembly method using the upper housing 201 and the lower housing 202 facilitates the deployment of positioning components, heat dissipation components, and electromagnetic shielding components for these devices, which is beneficial for automated production.
[0078] In some embodiments, the upper housing 201 and the lower housing 202 are made of metal materials, which facilitates electromagnetic shielding and heat dissipation.
[0079] In some embodiments, the optical module 200 further includes an unlocking component 600 located outside its housing. The unlocking component 600 is configured to establish a fixed connection between the optical module 200 and the host computer 100, or to release the fixed connection between the optical module 200 and the host computer 100.
[0080] For example, the unlocking component 600 is located on the outside of the two lower side plates 2022 of the lower housing 202, and includes a locking component that matches the cage 106 of the host computer 100. When the optical module 200 is inserted into the cage 106, the locking component of the unlocking component 600 fixes the optical module 200 in the cage 106; when the unlocking component 600 is pulled, the locking component of the unlocking component 600 moves accordingly, thereby changing the connection relationship between the locking component and the host computer, so as to release the fixation between the optical module 200 and the host computer, thereby allowing the optical module 200 to be pulled out of the cage 106.
[0081] Circuit board 300 includes circuit traces, electronic components, and chips. The circuit traces connect the electronic components and chips according to the circuit design to achieve functions such as power supply, electrical signal transmission, and grounding. Electronic components may include, for example, capacitors, resistors, transistors, and metal-oxide-semiconductor field-effect transistors (MOSFETs). Chips may include, for example, microcontroller units (MCUs), laser driver chips, transimpedance amplifiers (TIAs), limiting amplifiers (LAs), clock and data recovery chips (CDRs), power management chips, and digital signal processing (DSP) chips.
[0082] Circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also perform a load-bearing function. For example, the rigid circuit board can stably support the aforementioned electronic components and chips. The rigid circuit board can also be inserted into the electrical connector in the cage 106 of the host computer 100.
[0083] The circuit board 300 also includes gold fingers 310 formed on its end surfaces, each gold finger 310 consisting of a plurality of independent pins. The circuit board 300 is inserted into a cage 106 and is connected to an electrical connector within the cage 106 by the gold fingers 310. The gold fingers 310 may be provided only on one side of the surface of the circuit board 300 (e.g., ...). Figure 4The upper surface shown can also be positioned on the upper and lower surfaces of the circuit board 300 to provide a greater number of pins, thus adapting to applications with high pin count requirements. The gold fingers 310 are configured to establish an electrical connection with the host computer to achieve power supply, grounding, two-wire synchronous serial (Inter-Integrated Circuit, I2C) signal transmission, and data signal transmission. Of course, flexible circuit boards are also used in some optical modules. Flexible circuit boards are generally used in conjunction with rigid circuit boards as a supplement to rigid circuit boards.
[0084] The light emitting component 400 is used to receive electrical signals transmitted from the circuit board 300, so that the light emitting component 400 generates light signals; the light receiving component 500 is used to receive light signals input from outside the optical module and convert them into electrical signals. At least one of the light emitting component 400 or the light receiving component 500 is located on the side of the circuit board 300 away from the gold finger 310.
[0085] In some embodiments, the light emitting component 400 and the light receiving component 500 are physically separated from the circuit board 300, and then electrically connected to the circuit board 300 through corresponding flexible circuit boards or electrical connectors.
[0086] In some embodiments, at least one of the light emitting component 400 or the light receiving component 500 may be directly disposed on the circuit board 300. For example, at least one of the light emitting component 400 or the light receiving component 500 may be disposed on the surface of the circuit board 300 or the side of the circuit board 300.
[0087] In some embodiments, the optical module 200 further includes an optical transmission component 700 disposed within the housing. The optical transmission component 700 is used to establish an optical connection between the optical transmitting component 400, the optical receiving component 500 and the external optical fiber 101 (hereinafter referred to as the external optical fiber), so that the optical signal generated by the optical transmitting component 400 can be coupled to the external optical fiber, and the optical signal input from the external optical fiber can be coupled to the optical receiving component.
[0088] In some embodiments, the optical transmission component 700 includes an optical fiber adapter and an optical fiber, which may also be referred to as an internal optical fiber relative to an external optical fiber. One end of the optical fiber is connected to the optical fiber adapter, and the other end is connected to the optical transmitting component 400 or the optical receiving component 500. Exemplarily, the optical transmission component 700 includes multiple optical fiber adapters and multiple optical fibers. The optical transmitting component 400 can be connected to one or more optical fiber adapters via multiple optical fibers, and the optical receiving component 500 can be connected to multiple optical fiber adapters via multiple optical fibers. Of course, in this embodiment, the structure of the optical fiber adapter is not limited to one type; it can also be an LC connector, where the optical fiber adapter connects to one optical fiber.
[0089] In some embodiments, the optical transmission component 700 may include two optical fiber adapters and multiple optical fibers, each optical fiber adapter being connected to the optical transmitting component 400 and the optical receiving component 500 via the multiple optical fibers.
[0090] In some embodiments, a mounting hole 320 is provided on the circuit board 300, and the light emitting component 400 is assembled and connected to the mounting hole 320. For example, the light emitting component 400 is embedded in the mounting hole 320.
[0091] In some embodiments, the mounting hole 320 is a through hole, such that the top of the light emitting component 400 is above the mounting hole 320 and the bottom of the light emitting component 400 is below the mounting hole 320.
[0092] In some embodiments, a DSP chip 330 is disposed on the front side of the circuit board 300; the DSP chip 330 is used to transmit high-frequency electrical signals to the light emitting component 400, etc. Exemplarily, the DSP chip 330 is connected to a gold finger 310, through which high-frequency electrical signals are transmitted to the optical module 200 and preprocessed; the light emitting component 400 receives the preprocessed high-frequency electrical signals from the DSP chip 330 to generate an optical signal. Two opposing surfaces on the circuit board 300 are the main bearing surfaces of the circuit board 300; one of these surfaces is called the front surface of the circuit board 300, facing the upper cover plate 2011; the other surface is the back surface of the circuit board 300, facing the bottom plate 2021. The front and back surfaces of the circuit board 300 are opposing surfaces.
[0093] In some embodiments, the light receiving component 500 is disposed on the back side of the circuit board 300. Of course, in this embodiment, the light receiving component 500 is not limited to being disposed on the back side of the circuit board 300, but may also be disposed on the front side of the circuit board 300.
[0094] Figure 5 This is an internal structural diagram of another optical module according to some embodiments. For example... Figure 5 As shown, in some embodiments, the optical transmission component 700 includes an optical fiber adapter 710, multiple optical fibers 720, and multiple optical fibers 730. The optical transmitting component 400 and the optical receiving component 500 are respectively connected to the optical fiber adapter via the multiple optical fibers. The optical transmitting component 400 can generate multiple optical signals, which are transmitted to the optical fiber adapter 710 via the multiple optical fibers 720. The multiple optical signals input through the optical fiber adapter 710 are transmitted to the optical receiving component 500 via the multiple optical fibers 730, where the optical receiving component 500 receives the multiple optical signals and converts them into electrical signals.
[0095] Figure 6 Internal circuitry of an optical module according to some embodiments Figure 1 .like Figure 6As shown, in some embodiments, the high-frequency electrical signal input terminal of the DSP chip 330 is connected to the gold finger 310, and the high-frequency electrical signal output terminal of the DSP chip 330 is connected to the optical emitting component 400. The DSP chip 330 can preprocess the high-frequency electrical signal, such as through equalization processing. The optical emitting component 400 generates an emitted optical signal based on the preprocessed high-frequency electrical signal modulation. Exemplarily, the DSP chip 330 includes multiple high-frequency electrical signal input terminals and multiple high-frequency electrical signal output terminals, and the DSP chip 330 can preprocess multiple high-frequency electrical signals. The DSP chip 330 sends the processed multiple high-frequency electrical signals to the optical emitting component 400, causing the optical emitting component 400 to generate multiple optical signals.
[0096] Figure 7 This is a circuit diagram for extracting a reference clock according to some embodiments. For example... Figure 7 As shown, in some embodiments, the reference clock extraction circuit includes an optical switch 801, a beam splitter 802, and a clock extractor 803. The input of the optical switch 801 is connected to the optical port of the optical module 200, and the output of the optical switch 801 is connected to the input of the beam splitter 802, allowing the optical signal generated by the optical emitting component 400 to be transmitted to the beam splitter 802 via the optical switch 801. The first output of the beam splitter 802 is used to output the optical signal to be measured, and the second output of the beam splitter 802 is connected to the input of the clock extractor 803. The beam splitter 802 is used to split the optical signal output by the optical switch 801 according to a certain ratio to facilitate the extraction of the reference clock and signal measurement. The clock extractor 803 is used to extract the reference clock and output the reference clock through its output.
[0097] In some embodiments, the optical switch 801 includes multiple input terminals to facilitate the transmission of optical signals generated by the optical emitting component 400 to the beam splitter 802, thereby facilitating the detection of each beam of optical signals generated by the optical emitting component 400. By controlling the optical switch 801, the input and output terminals of the optical switch can be selectively turned on to select one of the multiple optical signals for transmission to the beam splitter 802. Exemplarily, the optical switch 801 may include four or eight input terminals.
[0098] In some embodiments, the optical emitting component 400 may include channel 1, channel 2, channel 3, and channel 4, each capable of outputting a beam of optical signal. Channels 1, 2, 3, and 4 of the optical emitting component 400 may be composed of optical emitting chips or the like, and can generate optical signals based on the driving of high-frequency electrical signals. The optical switch 801 includes four input terminals, which are correspondingly connected to the four channels of the optical emitting component 400, controlling the optical switch 801 to select the optical signal output through a specific channel.
[0099] In some embodiments, the reference clocks used for the optical signals output from channels 1, 2, 3, and 4 are non-homogeneous clocks. Therefore, when the clock extractor 803 extracts the reference clock for the output optical signal of a certain channel, it is often not possible to use that reference clock as the reference clock for the output optical signals of other channels. Thus, when measuring the output optical signals of the four channels of the optical emitting component 400, it is usually necessary to use the clock extractor 803 to extract the reference clocks for the output optical signals of the four channels separately, resulting in relatively low efficiency in measuring the quality of the optical signals generated by the optical emitting component 400.
[0100] Figure 8 Internal circuitry of an optical module according to some embodiments Figure 2 .like Figure 8 As shown, in some embodiments, a signal source 340 is further provided on the circuit board 300, the signal source 340 including a first output terminal and a second output terminal. The first output terminal of the signal source 340 is connected to the output terminal of the DSP chip 330, and the first output terminal of the signal source 340 can transmit high-frequency electrical signals to the DSP chip 330. The second output terminal of the signal source 340 is used to output a reference clock. Exemplarily, the signal source 340 stores high-frequency electrical signals.
[0101] In some embodiments, the signal source 340 may be integrated into the DSP chip 330.
[0102] In some embodiments, the DSP chip 330 may include a clock data recovery unit 331 and a phase-locked loop (PLL) 332. The input of the clock data recovery unit 331 is connected to a signal source 340, and its first output is connected to the input of the PLL 332. The output of the PLL 332 is connected to the optical emitting component 400. Exemplarily, the output of the PLL 332 is connected to channels 1, 2, 3, etc., of the optical emitting component 400, so that channels 1, 2, 3, etc., of the emitting component 400 generate optical signals based on the high-frequency electrical signal output by the PLL 332.
[0103] Signal source 340 outputs a high-frequency electrical signal and a reference clock. The high-frequency electrical signal is recovered by clock data recovery unit 331 to obtain a clock signal, which is directly fed to phase-locked loop 332. PLL 332 drives optical emitting component 400 to generate an optical signal based on the high-frequency electrical signal including the clock signal. This optical signal can be directly transmitted to the measuring device. The clock of this optical signal and the reference clock output by signal source 340 are from the same source. The reference clock output by signal source 340 can be used as a reference clock for measuring the optical signal to assist in the measurement of the optical signal, reducing the process of extracting a reference clock from the optical signal and facilitating the improvement of the efficiency of optical signal measurement.
[0104] In some embodiments, the clock data recovery unit and the phase-locked loop may not be integrated into the DSP chip 330; the clock data recovery unit and the phase-locked loop may be separate devices, and the clock data recovery unit and the phase-locked loop may be disposed on the circuit board 300.
[0105] Figure 9 Internal circuitry of an optical module according to some embodiments Figure 3 .like Figure 9 As shown, in some embodiments, the DSP chip 330 may include a clock data recovery unit 331, a frequency-locked loop 333, a crystal oscillator 334, and one or more phase-locked loops (PLLs). The input of the clock data recovery unit 331 is connected to the signal source 340, and its second output can be connected to the input of the frequency-locked loop 333. The output of the frequency-locked loop 333 is connected to the inputs of multiple PLLs. The output of the crystal oscillator 334 is connected to the inputs of multiple PLLs, and the multiple PLLs are correspondingly connected to channels of the optical emitting component 400.
[0106] In some embodiments, the output of the frequency-locked loop 333 can be connected to the first input of the phase-locked loop.
[0107] In some embodiments, the DSP chip 330 may include four or eight phase-locked loops (PLLs). The frequency-locked loop 333 may include four or eight output terminals. The multiple output terminals of the frequency-locked loop 333 are correspondingly connected to multiple PLLs.
[0108] In some embodiments, the DSP chip 330 may include a first phase-locked loop (PLL) 3321, a second PLL 3322, a third PLL 3323, and a fourth PLL 3324. The first input terminal of the first PLL 3321 is connected to the first output terminal of the frequency-locked loop 333; the first input terminal of the second PLL 3322 is connected to the second output terminal of the frequency-locked loop 333; the first input terminal of the third PLL 3323 is connected to the third output terminal of the frequency-locked loop 333; and the first input terminal of the fourth PLL 3324 is connected to the fourth output terminal of the frequency-locked loop 333. The second input terminals of the first PLL 3321, the second PLL 3322, the third PLL 3323, and the fourth PLL 3324 are respectively connected to the output terminal of the crystal oscillator 334. The output of the first phase-locked loop 3321 is connected to channel 1 of the light emitting component 400, the output of the second phase-locked loop 3322 is connected to channel 2 of the light emitting component 400, the output of the third phase-locked loop 3323 is connected to channel 3 of the light emitting component 400, and the output of the fourth phase-locked loop 3324 is connected to channel 4 of the light emitting component 400.
[0109] The first phase-locked loop 3321 and the second phase-locked loop 3322 can refer to the clock signal of the crystal oscillator 334. The clock data recovery unit 331 is clocked by the frequency-locked loop 333, which facilitates the maintenance of the limit independence and dynamic balance of the transmitted optical signal and the received optical signal.
[0110] In some embodiments, the output terminal of the clock data recovery unit 331 is connected to the third input terminal of the first phase-locked loop 3321, the third input terminal of the second phase-locked loop 3322, the third input terminal of the third phase-locked loop 3323, or the third input terminal of the fourth phase-locked loop 3324. For example, when the output terminal of the clock data recovery unit 331 is connected to the third input terminal of the first phase-locked loop 3321, the second output terminal of the first phase-locked loop 3321 can be connected to channel 2 of the light emitting component 400, the third output terminal of the first phase-locked loop 3321 can be connected to channel 3 of the light emitting component 400, and the fourth output terminal of the first phase-locked loop 3321 can be connected to channel 4 of the light emitting component 400. When the output of the clock data recovery unit 331 and the third input of the first phase-locked loop 3321 are controlled to be turned on, the second output of the first phase-locked loop 3321 and channels 1, 2, 3, and 4 of the optical emitting component 400 are also controlled to be turned on, so that the first phase-locked loop 3321 is shared by all channels of the optical emitting component 400. The frequency-locked loop 333 and the crystal oscillator 334 are disconnected from the link, and the first phase-locked loop 3321 is directly bound to the frequency of the clock data recovery unit 331. The signal source 340 outputs a high-frequency electrical signal and a reference clock. The high-frequency electrical signal is recovered by the clock data recovery unit 331 and directly given to the first phase-locked loop 3321. The first phase-locked loop 3321 drives the optical emitting component 400 to generate an optical signal based on the high-frequency electrical signal including the clock signal. This optical signal can be directly transmitted to the measuring device. The clock of this optical signal and the reference clock output by the signal source 340 are from the same source clock. The reference clock output by the signal source 340 can be used as a reference clock for measuring optical signals to assist in the measurement of optical signals, reducing the process of extracting a reference clock from the optical signal and facilitating the improvement of the efficiency of optical signal measurement.
[0111] Of course, in some embodiments, if the output of the clock data recovery unit 331 is connected to the third input of the second phase-locked loop 3322, then the second output of the second phase-locked loop 3322 can be connected to channel 1 of the optical emitting component 400, and the third output of the second phase-locked loop 3322 can be connected to channel 3 of the optical emitting component 400, etc. In this way, optical signals can be measured and reference clocks extracted based on the signal source 340, the clock data recovery unit 331, and the second phase-locked loop 3322. The output of the clock data recovery unit 331 can also be connected to the third input of the third phase-locked loop 3323 or the third input of the fourth phase-locked loop 3324, etc.
[0112] Figure 10 Internal circuitry of an optical module according to some embodiments Figure 4 .like Figure 10As shown, in some embodiments, the DSP chip 330 may include a multiplexer 335. The multiplexer 335 may include multiple input terminals, which are correspondingly connected to the fifth output terminals of multiple phase-locked loops. The output terminal of the multiplexer 335 may output a reference clock.
[0113] In some embodiments, the first input terminal of multiplexer 335 is connected to the fifth output terminal of the first phase-locked loop 3321, the second input terminal of multiplexer 335 is connected to the fifth output terminal of the second phase-locked loop 3322, the third input terminal of multiplexer 335 is connected to the fifth output terminal of the third phase-locked loop 3323, and the fourth input terminal of multiplexer 335 is connected to the fifth output terminal of the fourth phase-locked loop 3324. When it is necessary to measure the optical signal output from channel 1 of the optical emitting component 400, the fifth output terminal of the first phase-locked loop 3321 is controlled to be connected to the first input terminal of multiplexer 335, so that the reference clock output by multiplexer 335 is from the same source as the clock of the optical signal output from channel 1; when it is necessary to measure the optical signal output from channel 2 of the optical emitting component 400, the fifth output terminal of the second phase-locked loop 3322 is controlled to be connected to the second input terminal of multiplexer 335, so that the reference clock output by multiplexer 335 is from the same source as the clock of the optical signal output from channel 2, and so on. Thus, by using the multiplexer 335 to output a reference clock that is from the same source as the clock of the corresponding optical signal, it is convenient to complete the measurement of the transmitted optical signal.
[0114] In some embodiments, the multiplexer may not be integrated into the DSP chip 330; the multiplexer may be a separate device, or it may be disposed on the circuit board 300.
[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure 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. Such 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 this disclosure.
Claims
1. An optical module, characterized in that, include: The circuit board has a DSP chip and a signal source mounted on its surface. The signal source includes a first output terminal and a second output terminal. The first output terminal of the signal source is used to output a high-frequency electrical signal, and the second output terminal of the signal source outputs a reference clock. A light-emitting component used to generate light signals; The DSP chip includes: A clock data recovery unit, with its input connected to the first output of the signal source; The phase-locked loop has its input terminal connected to the output terminal of the clock data recovery unit, and its output terminal connected to the optical emitting component.
2. The optical module according to claim 1, characterized in that, The first output of the clock data recovery unit is connected to the third input of the phase-locked loop; The DSP chip also includes a frequency-locked loop and a crystal oscillator. The input terminal of the frequency-locked loop is connected to the second output terminal of the clock data recovery unit, the output terminal of the frequency-locked loop is connected to the first input terminal of the phase-locked loop, and the output terminal of the crystal oscillator is connected to the second input terminal of the phase-locked loop.
3. The optical module according to claim 2, characterized in that, The phase-locked loop includes a first phase-locked loop, a second phase-locked loop, a third phase-locked loop, and a fourth phase-locked loop; the first input terminal of the first phase-locked loop is connected to the first output terminal of the frequency-locked loop, the first input terminal of the second phase-locked loop is connected to the second output terminal of the frequency-locked loop, the first input terminal of the third phase-locked loop is connected to the third output terminal of the frequency-locked loop, and the first input terminal of the fourth phase-locked loop is connected to the fourth output terminal of the frequency-locked loop. The second input terminals of the first phase-locked loop, the second input terminal of the second phase-locked loop, the second input terminal of the third phase-locked loop, and the second input terminal of the fourth phase-locked loop are respectively connected to the crystal oscillator; the third input terminal of the first phase-locked loop is connected to the first output terminal of the clock data recovery unit. The light emitting component includes channels 1, 2, 3 and 4. The first output terminal of the first phase-locked loop is connected to channel 1, the second output terminal of the first phase-locked loop is connected to channel 2, the third output terminal of the first phase-locked loop is connected to channel 3, and the fourth output terminal of the phase-locked loop is connected to channel 4.
4. An optical module, characterized in that, include: The circuit board has a DSP chip mounted on its surface. A light emitting component is electrically connected to the circuit board, and the light emitting component is used to generate light signals; The DSP chip includes: The signal source includes a first output terminal and a second output terminal. The first output terminal of the signal source is used to output a high-frequency electrical signal, and the second output terminal of the signal source outputs a reference clock. A clock data recovery unit, with its input connected to the first output of the signal source; The phase-locked loop has its input connected to the clock data recovery unit and its output connected to the optical emitting component.
5. The optical module according to claim 4, characterized in that, The first output terminal of the clock data recovery unit is connected to the second input terminal of the phase-locked loop; The DSP chip also includes a frequency-locked loop and a crystal oscillator. The input terminal of the frequency-locked loop is connected to the second output terminal of the clock data recovery unit, the output terminal of the frequency-locked loop is connected to the first input terminal of the phase-locked loop, and the output terminal of the crystal oscillator is connected to the second input terminal of the phase-locked loop.
6. An optical module, characterized in that, include: The circuit board has a signal source and a DSP chip on its surface. The output terminal of the signal source is used to output a high-frequency electrical signal; The light emitting component includes multiple channels, each of which is used to generate a light signal. The DSP chip includes: The clock data recovery unit has its input connected to the output of the signal source; A frequency-locked loop, with its input terminal connected to the output terminal of the clock data recovery unit; Multiple phase-locked loops (PLLs) are provided, with their first input terminals connected to the output terminals of the frequency-locked loops, and their first output terminals correspondingly connected to multiple channels of the optical emitting component. The crystal oscillator's output is connected to the second input of multiple phase-locked loops. The multiplexer has its input terminals connected to the fifth output terminals of multiple phase-locked loops, and its output terminals are used to output a reference clock.
7. An optical module, characterized in that, include: The circuit board has a signal source, a DSP chip, and a multiplexer on its surface; the output of the signal source is used to output a high-frequency electrical signal, and the output of the multiplexer is used to output a reference clock. The light emitting component includes multiple channels, each of which is used to generate a light signal. The DSP chip includes: The clock data recovery unit has its input connected to the output of the signal source; A frequency-locked loop, with its input terminal connected to the output terminal of the clock data recovery unit; Multiple phase-locked loops (PLLs) are provided, with their first input terminals connected to the output terminals of the frequency-locked loops, their first output terminals corresponding to the multiple channels of the optical emitting component, and their fifth output terminals connected to the input terminals of the multiplexer. The crystal oscillator's output is connected to the second input of multiple phase-locked loops.