An optical module

Abstract

The application provides an optical module, comprising a circuit board and an optical transceiver sub-module. The optical transceiver sub-module comprises a round-square tube body, an optical transmitter, an optical receiver and an optical assembly. The round-square tube body is provided with a first tube opening and a second tube opening. The optical transmitter is inlaid in the first tube opening. The optical receiver is inlaid in the second tube opening. The optical assembly is arranged in the inner cavity of the round-square tube body and comprises a filter. The filtered wavelength and the optical power loss have a linear relationship, and the slope of the linear relationship is negative, which is used for adjusting the optical power output by the optical module according to the linear relationship, so that the optical power output by the optical module at different temperatures is the same. The application adjusts the optical power output by the optical module by using the linear relationship between the filtered wavelength and the optical power loss, so that the optical power output by the optical module is the same at different temperatures, which not only avoids the use of the control power upper and lower limit mode to adjust the coupling power, reduces the production failure rate of the production line, but also solves the technical problem of insufficient bandwidth of the optical module at low temperature.

Description

TECHNICAL FIELD

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

[0002] In cloud computing, mobile Internet, video and other new business and application modes, optical communication technology will be used, and in optical communication, the optical module is a tool for converting optical signals and electrical signals, and is one of the key devices in optical communication equipment. The optical module is mainly used for optical-electric and electric-optical conversion. The transmitting end converts electrical signals into optical signals and transmits them through optical fibers, and the receiving end converts received optical signals into electrical signals.

[0003] Currently, the optical module uses a control power upper and lower limit method to adjust the optical power, so that the optical module can output the same optical power at different temperatures. However, the production failure rate of the production line is relatively high after the power upper and lower limits are required for some products. SUMMARY

[0004] The present application provides an optical module, which avoids adjusting the optical power by using the power upper and lower limit method and reduces the production failure rate of the production line.

[0005] An optical module comprises:

[0006] a circuit board;

[0007] an optical transceiver sub-module electrically connected to the circuit board;

[0008] The optical transceiver sub-module comprises a round-square tube body, an optical transmitter, an optical receiver and an optical assembly.

[0009] The round-square tube body is provided with a first tube opening and a second tube opening.

[0010] The optical transmitter is inlaid in the first tube opening and used for transmitting optical signals.

[0011] The optical receiver is inlaid in the second tube opening and used for receiving optical signals.

[0012] The optical assembly is arranged in the inner cavity of the round-square tube body and comprises a filter.

[0013] The filter has a linear relationship between the filtered wavelength and the optical power loss, and the slope of the linear relationship is negative, and is used for adjusting the optical power output by the optical module according to the linear relationship.

[0014] An optical module comprises:

[0015] a circuit board;

[0016] an optical transceiver sub-module electrically connected to the circuit board;

[0017] The optical transceiver sub-module comprises a round-square tube body, an optical transmitter, an optical receiver and an optical assembly;

[0018] The round-square tube body is provided with a first tube opening and a second tube opening.

[0019] The optical transmitter is inlaid in the first tube opening and used for emitting optical signals.

[0020] The optical receiver is inlaid in the second tube opening and used for receiving optical signals.

[0021] The optical assembly is arranged in the inner cavity of the round-square tube body and comprises a filter.

[0022] The longer the filtered wavelength is, the smaller the optical power loss is; the shorter the filtered wavelength is, the greater the optical power loss is, so as to adjust the optical power output by the optical module.

[0023] Beneficial effects: the application provides an optical module, which comprises a circuit board and an optical transceiver sub-module electrically connected with the circuit board. The optical transceiver sub-module comprises a round-square tube body, an optical transmitter, an optical receiver and an optical assembly. The round-square tube body is provided with a first tube opening and a second tube opening. The optical transmitter is embedded in the first tube opening and used for emitting an optical signal. The optical receiver is embedded in the second tube opening and used for receiving an optical signal. The optical assembly is arranged in an inner cavity of the round-square tube body and comprises a filter. The filtered wavelength of the filter has a linear relationship with optical power loss, and the slope of the linear relationship is negative, which is used for adjusting the optical power output by the optical module according to the linear relationship, so that the optical power output by the optical module at different temperatures is the same. Since the working current of the optical transmitter chip increases with the increase of temperature, the working current of the optical module at low temperature is smaller than that at normal temperature, and is smaller than that at high temperature. Therefore, the optical module without the filter needs a smaller working current at low temperature, which is close to the threshold value, resulting in that the bandwidth of the optical module does not meet the requirements, that is, the bandwidth of the optical module is insufficient. Since the working current of the optical module is larger at the same temperature, the optical power output by the optical module is larger. In order to avoid that the bandwidth of the optical module at low temperature does not meet the requirements, the working current of the optical module is increased. When the working current of the optical module is increased, the bandwidth of the optical module meets the requirements, but the optical power output by the optical module is increased, which may cause that the optical power output by the optical module at low temperature exceeds the upper limit of the optical power output by the optical module at low temperature, so that the optical power index and the bandwidth index cannot meet the requirements at the same time. In order to make the optical power output by the optical module at low temperature reach the optical power output by the optical module at low temperature, the filter is added to reduce the optical power output by the optical module at low temperature, so that the optical power output by the optical module at low temperature reaches the optical power output by the optical module at low temperature, and the bandwidth of the optical module at low temperature is optimized. However, if the optical power loss of the added filter at low temperature, normal temperature and high temperature is the same, the optical power output by the optical module at high temperature may not reach the optical power output by the optical module at high temperature. In order to make the optical power output by the optical module at high temperature reach the optical power output by the optical module at high temperature, the working current of the optical module at high temperature needs to be further increased, and the working current of the optical module at high temperature is too large, so that the optical power output by the optical module at high temperature is easy to be saturated. The filtered wavelength of the filter has a linear relationship with the optical power loss, and the slope of the linear relationship is negative. That is, with the increase of temperature, the optical power loss of the filter gradually decreases. Since the optical power loss of the filter gradually decreases with the increase of temperature, in order to make the optical power output by the optical module at different temperatures be the same, the optical power emitted by the optical transmitter chip of the optical module needs to gradually decrease with the increase of temperature. Therefore, the working current of the optical module at low temperature with the filter is larger than that of the optical module at low temperature with the filter having the same optical power loss at different temperatures, and the working current of the optical module at low temperature with the filter having the same optical power loss at different temperatures is larger than that of the optical module at low temperature without the filter. At this time, the working current of the optical module is far away from the threshold value, which further avoids the insufficient bandwidth.The working current of the optical module at high temperature with the filter added is less than the working current of the optical module at high temperature with the filter of the same optical power loss at different temperatures added, and the working current of the optical module is less than the working current when the optical power output by the optical module is saturated, thereby avoiding saturation of the optical power output by the optical module at high temperature. In the application, the wavelength filtered by the filter and the optical power loss are linearly related to adjust the optical power output by the optical module, so that the optical power output by the optical module is the same at different temperatures, which not only avoids using the control power upper and lower limit method to adjust the coupling power and reduces the production failure rate of the production line, but also solves the technical problems of insufficient bandwidth of the optical module at low temperature and saturation of the optical power output by the optical module at high temperature. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 It is a schematic diagram of electrical connection relationship of optical communication terminal;

[0026] Figure 2 It is a schematic diagram of optical network terminal structure;

[0027] Figure 3 It is a schematic diagram of optical module structure provided by the embodiments of the application;

[0028] Figure 4 It is a schematic diagram of optical module exploded structure provided by the embodiments of the application;

[0029] Figure 5 It is a schematic diagram of optical transceiver sub-module structure provided by the embodiments of the application;

[0030] Figure 6 It is an exploded view of the optical transceiver sub-module provided by the embodiments of the application;

[0031] Figure 7 It is a plan view of the optical transceiver sub-module provided by the embodiments of the application;

[0032] Figure 8 It is a relationship diagram between the filter chip and the optical power loss provided by the embodiments of the application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the scope of the present application.

[0034] One of the core links of optical fiber communication is the mutual conversion of optical signals and electrical signals. Optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers / optical waveguides, and the passive transmission characteristics of light in optical fibers / optical waveguides can be used to achieve low-cost and low-loss information transmission; and the information processing equipment such as computers uses electrical signals. In order to establish an electrical connection between the information transmission equipment such as optical fibers / optical waveguides and the information processing equipment such as computers, it is necessary to realize the mutual conversion of electrical signals and optical signals.

[0035] The optical module realizes the mutual conversion of optical signals and electrical signals in the field of optical fiber communication technology, and the mutual conversion of optical signals and electrical signals is the core function of the optical module. The optical module realizes the electrical connection between the external host computer through the gold fingers on the internal circuit board, and the main electrical connection includes power supply, I2C signal, data signal and ground; the optical module realizes the photoelectric connection with the external optical fiber through the optical interface, and the electrical connection mode of the external optical fiber has many types, which derives many types of optical fiber electrical connector; the use of gold fingers to realize electrical connection at the electrical interface has become the mainstream electrical connection mode in the optical module industry, and based on this, the definition of pins on the gold fingers has formed many industry protocols / specifications; the photoelectric connection mode realized by the optical interface and the optical fiber electrical connector has become the mainstream electrical connection mode in the optical module industry, and based on this, the optical fiber electrical connector has also formed many industry standards, such as LC interface, SC interface, MPO interface, etc., and the optical interface of the optical module has also been adaptively designed for the optical fiber electrical connector, and the optical fiber adapter provided at the optical interface has many types.

[0036] Figure 1 The figure shows the electrical connection relationship of the optical communication terminal. As shown in Figure 1 , the electrical connection of the optical communication terminal mainly includes the mutual electrical connection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

[0037] One end of the optical fiber 101 is electrically connected to a remote server, and one end of the network cable 103 is electrically connected to a 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.

[0038] The optical interface of the optical module 200 externally accesses the optical fiber 101 and establishes a bidirectional optical signal electrical connection with the optical fiber 101; the electrical interface of the optical module 200 externally accesses the optical network terminal 100 and establishes a bidirectional electrical signal electrical connection with the optical network terminal 100; bidirectional conversion between optical signals and electrical signals is realized in the optical module, thereby establishing an electrical information 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 then input into the optical fiber 101.

[0039] The optical network terminal has an optical module interface 102 for accessing the optical module 200 and establishing a bidirectional electrical signal electrical connection with the optical module 200; the optical network terminal has a network cable interface 104 for accessing the network cable 103 and establishing a bidirectional electrical signal electrical connection with the network cable 103 (generally an electrical signal of an Ethernet protocol, which is different from the electrical signal used by the optical module); an electrical connection is established between the optical module 200 and the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits signals from the optical module to the network cable and transmits signals from the network cable to the optical module, and 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, which provides data signals to the optical module and receives data signals from the optical module, and thus a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

[0040] 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.

[0041] Figure 2 The optical network terminal is a structural schematic diagram. As shown in Figure 2 The circuit board 105 is provided in the optical network terminal 100, and a cage 106 is arranged on the surface of the circuit board 105; an electrical connector is arranged in the cage 106, which is used to access the electrical interface (such as a gold finger, etc.) of the optical module; a heat sink 107 is arranged on the cage 106, and the heat sink 107 has a fin or other protruding part for increasing the heat dissipation area.

[0042] The optical module 200 is inserted into the optical network terminal, the electrical interface of the optical module is inserted into the electrical connector in the cage 106, and the optical interface of the optical module is electrically connected with the optical fiber 101.

[0043] 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 optical module is fixed by the cage; the heat generated by the optical module is conducted to the cage 106, and then diffused through the heat sink 107 on the cage.

[0044] Figure 3 A schematic diagram of an optical module structure is provided for the embodiment of the present application. Figure 4 A schematic diagram of an optical module exploded structure is provided for the embodiment of the present application. As shown in Figure 3 、 Figure 4 The optical module 200 provided by the embodiment of the present application includes an upper shell 201, a lower shell 202, an unlocking component 203, a circuit board 300, and an optical transceiver sub-module 400.

[0045] The upper shell 201 is combined with the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity generally presents a square body; specifically, the lower shell includes a main plate and two side plates located on both sides of the main plate and arranged perpendicularly to the main plate; the upper shell includes a cover plate combined with the two side plates of the upper shell to form the wrapping cavity; the upper shell can further include two side walls located on both sides of the cover plate and arranged perpendicularly to the cover plate, which are combined with the two side plates to realize the combination of the upper shell with the lower shell.

[0046] The two openings can 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 an upper machine such as an optical network terminal; the other opening is an optical interface 205 for electrical connection with an external optical fiber connector (external optical fiber); the optical and electrical devices such as the circuit board 300, the optical transmitting sub-module 301, and the optical transceiver sub-module 400 are located in the wrapping cavity.

[0047] The combination of the upper shell and the lower shell facilitates the installation of the devices such as the circuit board 300 and the optical transceiver sub-module 400 into the shell, and the upper shell and the lower shell form the outermost packaging protective shell of the optical module; the upper shell and the lower shell are generally made of metal material, which is beneficial to electromagnetic shielding and heat dissipation; generally, the shell of the optical module is not made into an integral component, and the integral shell is not conducive to the assembly of the devices inside the shell.

[0048] The unlocking component 203 is located on the outer wall of the wrapping cavity / lower shell 202, and is used to realize the fixed electrical connection between the optical module and the upper machine, or to release the fixed electrical connection between the optical module and the upper machine.

[0049] The unlocking component 203 has a clamping component matched with the cage of the host computer; the end of the unlocking component can be pulled to relatively move the unlocking component on the surface of the outer wall; the optical module is inserted into the cage of the host computer, and the clamping component of the unlocking component fixes the optical module in the cage of the host computer; by pulling the unlocking component, the clamping component of the unlocking component moves, and then the electrical connection relationship between the clamping component and the host computer is changed, so that the clamping relationship between the optical module and the host computer is released, and the optical module can be pulled out of the cage of the host computer.

[0050] The circuit board 300 is located in the wrapping cavity formed by the upper and lower shells, and is provided with circuit traces, electronic components (such as capacitors, resistors, transistors, MOS tubes), and chips (such as MCUs, laser drive chips, limiting amplifier chips, clock data recovery CDR, power management chips, data processing chips DSP), and the like.

[0051] The circuit board 300 connects the electrical devices in the optical module according to the circuit design through the circuit traces, so as to realize the electrical functions such as power supply, electrical signal transmission, and grounding.

[0052] The circuit board 300 is generally a hard circuit board. Due to the relatively hard material of the hard circuit board, the hard circuit board can also realize the bearing function. For example, the hard circuit board can stably bear the chip. When the optical transceiver is located on the circuit board, the hard circuit board can also provide stable bearing. The hard circuit board can also be inserted into the electrical connector in the cage of the host computer. Specifically, a metal pin / gold finger is formed on the surface of the end of the hard circuit board, which is used for connecting with the electrical connector. These are not convenient to realize by the flexible circuit board.

[0053] The flexible circuit board is also used in part of the optical module as a supplement to the hard circuit board. The flexible circuit board is generally used in cooperation with the hard circuit board. For example, the flexible circuit board can be used to connect between the hard circuit board and the optical transceiver.

[0054] The end surface of the circuit board 300 has a gold finger composed of independent pins. The circuit board is inserted into the electrical connector in the cage, and the gold finger is in conductive connection with the clamping spring in the electrical connector. The gold finger can be arranged only on one side surface of the circuit board. Considering the large number of pin requirements, the gold finger is generally arranged on the upper and lower surfaces of the circuit board. The gold finger is used to establish electrical connection with the host computer. The electrical connection can be power supply, grounding, I2C signal, communication data signal, and the like.

[0055] The optical transceiver sub-module 400 is located in the wrapping cavity formed by the upper and lower shells, and is electrically connected with the circuit board 300, and is used for transmitting and receiving optical signals.

[0056] Embodiment 1

[0057] Figure 5A structural schematic diagram of the optical transceiver sub-module is provided for an embodiment of the present application. Figure 6 An exploded view of the optical transceiver sub-module is provided for an embodiment of the present application. Figure 7 A plan view of the optical transceiver sub-module is provided for an embodiment of the present application. Figure 8 A graph of the relationship between the optical filter chip and the optical power loss is provided for an embodiment of the present application. Figure 8 In the graph, the abscissa represents the wavelength, and the ordinate represents the optical power loss, wherein the optical power loss is a negative value. Figures 5-8 As shown in the graph, the optical transceiver sub-module 400 includes a round-square tube body 401, an optical transmitter 402, an optical receiver 403, an optical assembly 404, and a fiber adapter 405. Specifically,

[0058] The round-square tube body 401 is provided with a first port, a second port, and a third port, and is used to carry and fix the optical transmitter 402, the optical receiver 403, the optical assembly 404, and the fiber adapter 405. Specifically, the optical transmitter 402 is inlaid in the first port, the optical receiver 403 is inlaid in the second port, the optical assembly 404 is arranged in the inner cavity of the round-square tube body 401, and the fiber adapter 405 is inlaid in the third port.

[0059] Generally, the first port and the second port are arranged on the adjacent side walls of the round-square tube body 401, respectively, the first port and the third port are arranged on the side walls in the length direction of the round-square tube body 401, respectively, and the second port is arranged on the side wall in the width direction of the round-square tube body 401.

[0060] The round-square tube body 401 is generally made of metal material, which is beneficial to electromagnetic shielding and heat dissipation. Specifically, the optical transmitter 402 is in thermal contact with the round-square tube body 401 through the first port, and the optical receiver 403 is in thermal contact with the round-square tube body 401 through the second port. The optical transmitter 402 and the optical receiver 403 are directly press-fitted into the round-square tube body 401, and the round-square tube body 401 is in contact with the optical transmitter 402 and the optical receiver 403 directly or through a thermal conductive medium. In this way, the round-square tube body 401 can be used for heat dissipation of the optical transmitter 402 and the optical receiver 403, and the heat dissipation effect of the optical transmitter 402 and the optical receiver 403 is ensured.

[0061] The light transmitter 402 is connected to the circuit board 300 through a flexible circuit board, and is internally provided with a light emitting chip and a lens for emitting light signals. Specifically, the light transmitter 402 includes a tube base and a tube cap, the tube cap is covered on the tube base, and the tube cap and the tube base form a cavity. The light emitting chip is arranged on the tube base, and the lens is arranged in the cavity or on the tube cap. When the lens is arranged in the cavity, a flat window is arranged on the tube cap. At this time, the light signals emitted by the light emitting chip are emitted into the optical assembly 404 through the lens and the flat window. When the lens is arranged on the tube cap, the flat window is no longer arranged on the tube cap. At this time, the light signals emitted by the light emitting chip are emitted into the optical assembly 404 through the lens.

[0062] The lens can be a focusing lens or a collimating lens. Specifically, when the lens is a focusing lens, the optical assembly 404 no longer includes a collimating lens. At this time, the light signals emitted by the light emitting chip are converged after passing through the focusing lens and are then emitted into the optical assembly 404, and are coupled into the fiber adapter 405 through the optical assembly 404. When the lens is a collimating lens, the optical assembly 404 includes a focusing lens. At this time, the light signals emitted by the light emitting chip are collimated after passing through the collimating lens and are then emitted into the optical assembly 404, and are coupled into the fiber adapter 405 after being converged by the focusing lens in the optical assembly.

[0063] The light receiver 403 is connected to the circuit board 300 through a flexible circuit board, and is internally provided with a light receiving chip for receiving light signals. Specifically, the light receiver 403 includes a tube base and a tube cap, the tube cap is covered on the tube base, and the tube cap and the tube base form a cavity. The light receiving chip is arranged on the tube base. The light signals emitted by the fiber adapter 405 are reflected to the light receiving chip in the light receiver 403 through the optical assembly 404.

[0064] The optical assembly 404 is arranged in the inner cavity of the round square tube body 401, and includes an isolator 4041, a filter 4042 and a filter mirror 4043 for adjusting the light signals emitted by the light transmitter 402 and adjusting the light signals incident to the light receiver 403.

[0065] The isolator 4041 is arranged between the light transmitter 402 and the filter 4042, or is arranged between the filter 4042 and the filter mirror 4043, and is used for preventing the light signals emitted by the light transmitter 402 from returning to the light transmitter 402.

[0066] In the 4G era, the rate of the optical transmitting chip of the optical module is 10Gbit / s, at this time the bandwidth of the optical module is enough at low, normal and high temperatures. But with the coming of the 5G era, the rate of the optical transmitting chip of the optical module rises from 10Gbit / s to 25Gbit / s or 50Gbit / s, at this time the bandwidth of the optical module is enough at normal temperature, but is insufficient at low temperature. Specifically, because the working current of the optical transmitting chip increases with the increase of temperature. That is, the working current of the optical module at low temperature is less than that at normal temperature, and is less than that at high temperature. Then the optical module without the optical filter, at this time the working current at low temperature is small, even close to the threshold, resulting in that the bandwidth of the optical module does not meet the requirements, that is, the bandwidth of the optical module is insufficient.

[0067] Because at the same temperature, the greater the working current of the optical module, the greater the optical power output by the optical module, and the greater the bandwidth of the optical module. In order to avoid that the bandwidth of the optical module at low temperature does not meet the requirements, the working current of the optical module is increased. When the working current of the optical module is increased, the bandwidth of the optical module meets the requirements, but the optical power output by the optical module increases, which may cause that the optical power output by the optical module at low temperature exceeds the upper limit of the optical power required to be output by the optical module at low temperature, so that the optical power index and the bandwidth index cannot meet the requirements at the same time. In order to make the optical power output by the optical module at low temperature reach the optical power required to be output by the optical module at low temperature, the optical filter is added to reduce the optical power output by the optical module at low temperature, not only to make it reach the optical power required to be output by the optical module at low temperature, but also to optimize the bandwidth of the optical module at low temperature.

[0068] But if the optical power loss of the added optical filter is the same at low, normal and high temperatures, in order to make the optical power output by the optical module at different temperatures be the same, the optical power emitted by the optical transmitting chip of the optical module needs to remain unchanged with the increase of temperature. Because at this time the optical power output by the optical module at high temperature does not reach the optical power required to be output by the optical module at high temperature, in order to make the optical power output by the optical module at high temperature reach the optical power required to be output by the optical module at high temperature, the working current of the optical module at high temperature needs to be increased, at this time the working current of the optical module at high temperature is too large, and the optical power output by the optical module at high temperature is easy to saturate.

[0069] The filter 4042 filters a wavelength and a light power loss in a linear relationship, and a slope of the linear relationship is negative, and is used to adjust the light power output by the optical module according to the linear relationship, so that the light power output by the optical module at different temperatures is the same. The light power output by the optical module at different temperatures is the same, which theoretically means that the light power output by the optical module at different temperatures is completely the same, but actually, the light power output by the optical module at different temperatures is not completely the same, but is in a range, that is, the light power output by the optical module has a slight fluctuation up and down. Specifically, the wavelength filtered by the filter 4042 and the light power loss are in a linear relationship, and the slope of the linear relationship is negative, which means that the wavelength filtered by the filter 4042 gradually increases, and the light power loss gradually decreases. The wavelength filtered by the filter 4042 and the light power loss are both related to temperature. Specifically, as the temperature increases, the wavelength filtered by the filter 4042 gradually increases, and the light power loss gradually decreases; as the temperature decreases, the wavelength filtered by the filter 4042 gradually decreases, and the light power loss gradually increases.

[0070] Table 1

[0071] Temperature / °C Wavelength 1 / nm Wavelength 2 / nm Wavelength 3 / nm -40 1260 1265 1270 25 1265 1270 1275 85 1270 1275 1280

[0072] Table 1 is a relationship table between the wavelength emitted by the optical transmitting chip and the temperature provided by the embodiment of the present application. As can be seen from Table 1, the relationship between the wavelength emitted by the optical transmitting chip and the temperature is as follows: the wavelength emitted by the optical transmitting chip increases as the temperature increases. That is, as the temperature increases, the wavelength emitted by the optical transmitting chip is longer; as the temperature decreases, the wavelength emitted by the optical transmitting chip is shorter.

[0073] As the temperature increases, the wavelength emitted by the optical transmitting chip gradually increases, the wavelength filtered by the filter 4042 gradually increases, and the light power loss of the filter 4042 gradually decreases. In order to make the light power output by the optical module at different temperatures the same, compared with the optical module with the filter with the same light power loss at different temperatures, the light power emitted by the optical transmitting chip of the optical module with the filter 4042 gradually decreases as the temperature increases.

[0074] Since the addition of the filter 4042 will definitely cause the light power loss of the optical module, in order to make the light power output by the optical module at different temperatures the same, the operating current of the optical transmitting chip increases as the filter 4042 is added, and the operating current of the optical transmitting chip also increases as the filter with the same light power loss at different temperatures is added.

[0075] Therefore, the working current of the optical module with the filter 4042 added at low temperature is greater than the working current of the optical module with the filter added at different temperatures and with the same optical power loss at low temperature, and the working current of the optical module with the filter added at different temperatures and with the same optical power loss at low temperature is greater than the working current of the optical module without the filter at low temperature. At this time, the working current of the optical module is far from the threshold, further avoiding insufficient bandwidth.

[0076] The working current of the optical module with the filter 4042 added at high temperature is less than the working current of the optical module with the filter added at different temperatures and with the same optical power loss at high temperature, but greater than the working current of the optical module without the filter at high temperature. At this time, the working current of the optical module is lower than the working current when the optical power output by the optical module is saturated, avoiding saturation of the optical power output by the optical module at high temperature.

[0077] For example, before the filter 4042 is added, the wavelength of the optical signal emitted by the optical module is 1270 nm at room temperature, 1265 nm at low temperature, and 1275 nm at high temperature. When the optical power output by the optical module at different temperatures is all 1 mw, the working current of the optical module needs to be 10 mA (10 mA may be near the threshold of the working current of the optical module emitting the optical signal, which is easy to cause insufficient bandwidth) at low temperature; the working current of the optical module needs to be 40 mA at room temperature; and the working current of the optical module needs to be 60 mA at high temperature.

[0078] After adding a filter with the same optical power loss at different temperatures in the round square tube of the optical module, since the optical power loss of the filter at low temperature, room temperature and high temperature is the same, when the optical power output by the optical module at low temperature is all 1 mw, the working current of the optical module only needs to be increased from 10 mA to 12 mA (12 mA is close to the threshold of the working current). When the optical power output by the optical module at room temperature is about 1 mw, the working current of the optical module only needs to be increased from 40 mA to 45 mA; and when the optical power output by the optical module at high temperature is all 1 mw, the working current of the optical module needs to be increased from 60 mA to 90 mA (90 mA may cause optical power saturation).

[0079] After adding a filter 4042 in the round-square tube of the optical module, the optical power emitted by the light emitting chip of the optical module gradually decreases with the increase of temperature, because the optical power loss of the filter 4042 gradually decreases with the increase of temperature. When the optical power output by the optical module at low temperature needs to be 1mw, the working current of the optical module only needs to be increased from 12mA to 20mA (20mA is far away from the working current threshold of the optical module to emit optical signals, avoiding the problem of insufficient bandwidth). When the optical power output by the optical module at room temperature needs to be about 1mw, the working current of the optical module only needs to be 45mA. When the optical power output by the optical module at high temperature needs to be 1mw, the working current of the optical module only needs to be reduced from 90mA to 63mA (avoiding optical power saturation).

[0080] The filter mirror 4043 is arranged below the optical receiver 403 and is used to reflect the optical signal into the optical receiver 403. Specifically, the optical signal emitted by the fiber adapter 405 enters the filter mirror 4043 and is reflected by the filter mirror 4043 to enter the optical receiver 403.

[0081] The fiber adapter 405 is used to connect the optical fiber. Specifically, the optical transmitter 402 is embedded in the first port of the round-square tube, the optical receiver 403 is embedded in the second port of the round-square tube, and the fiber adapter 405 is embedded in the third port of the round-square tube. The optical transmitter 402 and the optical receiver 403 establish optical connection with the fiber adapter 405 respectively. The optical signal emitted by the optical transmitter 402 and the optical signal received by the optical receiver 403 are transmitted through the same optical fiber in the fiber adapter 405, that is, the same optical fiber in the fiber adapter 405 is the transmission channel for the optical transceiver sub-module to enter and exit light, and the optical transceiver sub-module realizes the single-fiber bidirectional optical transmission mode.

[0082] The requirement for the filter 4042 in the present application is that the longer the filtered wavelength, the smaller the optical power loss, and the shorter the filtered wavelength, the greater the optical power loss. However, in embodiment 1, it is required that the filtered wavelength of the filter 4042 and the optical power loss have a linear relationship, and the slope of the linear relationship is negative. However, the filtered wavelength of the filter 4042 and the optical power do not have a linear relationship. See embodiment 2 for details.

[0083] Embodiment 2

[0084] The filter 4042 filters the wavelength, the longer the filtered wavelength, the smaller the optical power loss, and the shorter the filtered wavelength, the greater the optical power loss, which is used to adjust the optical power output by the optical module, so that the optical power output by the optical module at different temperatures is the same. Here, the longer the filtered wavelength of the filter 4042, the smaller the optical power loss, and the shorter the filtered wavelength of the filter 4042, the greater the optical power loss, which is not a linear relationship between the filtered wavelength of the filter 4042 and the optical power loss.

[0085] The higher the temperature, the longer the wavelength of the light emitting chip, the longer the wavelength filtered by the optical filter 4042, and the smaller the optical power loss. The lower the temperature, the shorter the wavelength of the light emitting chip, the shorter the wavelength filtered by the optical filter 4042, and the greater the optical power loss. In order to make the optical power output by the optical module at different temperatures the same, the lower the temperature, the greater the optical power emitted by the optical emitting chip of the optical module; the higher the temperature, the smaller the optical power emitted by the optical emitting chip of the optical module.

[0086] The lower the temperature, the greater the optical power emitted by the optical emitting chip of the optical module, at this time the working current of the optical module is far away from the threshold value, further avoiding insufficient bandwidth; the higher the temperature, the smaller the optical power emitted by the optical emitting chip of the optical module, at this time the working current of the optical module is lower than the working current when the optical power is saturated, avoiding the saturation of the optical power output by the optical module.

[0087] The embodiments of the present application are different from the above-mentioned embodiments in the relationship between the wavelength of the optical filter 4042 and the optical power loss, and the rest are the same, which will not be repeated here.

[0088] In the present application, the structure of the optical module is not limited to the structure described above, and the optical module can also be configured to include a double transmitter and a double receiver, or only include one transmitter, etc. Here, it will not be repeated.

[0089] The application provides an optical module, which comprises a circuit board and an optical transceiver sub-module electrically connected with the circuit board. The optical transceiver sub-module comprises a round-square tube body, an optical transmitter, an optical receiver and an optical assembly. The round-square tube body is provided with a first tube opening and a second tube opening. The optical transmitter is embedded in the first tube opening and used for transmitting an optical signal. The optical receiver is embedded in the second tube opening and used for receiving an optical signal. The optical assembly is arranged in an inner cavity of the round-square tube body and comprises a filter. The filter has a linear relationship between a filtered wavelength and optical power loss, and a slope of the linear relationship is negative, which is used for adjusting an optical power output by the optical module according to the linear relationship, so that the optical power output at different temperatures is the same. Since the working current of the optical transmitter chip decreases with the increase of temperature, the working current of the optical module at low temperature is smaller than that at normal temperature, and is smaller than that at high temperature. Therefore, the optical module without the filter needs a smaller working current at low temperature, and even approaches a threshold value, which leads to that the bandwidth of the optical module does not meet the requirement, i.e., the bandwidth of the optical module is insufficient. Since the working current of the optical module is larger at the same temperature, the optical power output by the optical module is larger. In order to avoid that the bandwidth of the optical module at low temperature does not meet the requirement, the working current of the optical module is increased. When the working current of the optical module is increased, the bandwidth of the optical module meets the requirement, but the optical power output by the optical module is increased, which may cause that the optical power output by the optical module at low temperature exceeds an upper limit of the optical power output by the optical module at low temperature, and causes that the optical power index and the bandwidth index cannot meet the requirement at the same time. In order to make the optical power output by the optical module at low temperature reach the optical power output by the optical module at low temperature, the filter is added to reduce the optical power output by the optical module at low temperature, which not only makes the optical power output by the optical module at low temperature reach the optical power output by the optical module at low temperature, but also optimizes the bandwidth of the optical module at low temperature. However, if the filter added has the same optical power loss at low temperature, normal temperature and high temperature, the optical power output by the optical module at high temperature may not reach the optical power output by the optical module at high temperature. In order to make the optical power output by the optical module at high temperature reach the optical power output by the optical module at high temperature, the working current of the optical module at high temperature needs to be further increased, and the working current of the optical module at high temperature is too large, which easily causes saturation of the optical power output by the optical module at high temperature. The filter has a linear relationship between a filtered wavelength and optical power loss, and a slope of the linear relationship is negative. That is, the optical power loss of the filter gradually decreases with the increase of temperature. Since the optical power loss of the filter gradually decreases with the increase of temperature, in order to make the optical power output by the optical module at different temperatures be the same, the optical power emitted by the optical transmitter chip of the optical module needs to gradually decrease with the increase of temperature. Therefore, the working current of the optical module at low temperature with the filter is larger than that of the optical module at low temperature with the filter having the same optical power loss at different temperatures, and the working current of the optical module at low temperature with the filter having the same optical power loss at different temperatures is larger than that of the optical module at low temperature without the filter. At this time, the working current of the optical module is far away from the threshold value, which further avoids the insufficient bandwidth.The working current of the optical module at high temperature with the filter is less than the working current of the optical module at high temperature with the filter of the same optical power loss at different temperatures, and the working current of the optical module is lower than the working current when the optical power output of the optical module is saturated, thereby avoiding the saturation of the optical power output of the optical module at high temperature. In the application, the wavelength filtered by the filter and the optical power loss are linearly related to adjust the optical power output of the optical module, so that the optical power output is the same at different temperatures. Not only the production failure rate of the production line is reduced by using the control power upper and lower limit method to adjust the coupling power, but also the technical problems of insufficient bandwidth of the optical module at low temperature and saturation of the optical power output of the optical module at high temperature are solved.

[0090] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. An optical module, characterized in that: include: circuit boards; an optical transceiver sub-module, electrically connected to the circuit board; The optical transceiver submodule includes a round square tube body, an optical transmitter, an optical receiver and an optical component; The square tube body is provided with a first tube opening and a second tube opening; The optical transmitter is embedded in the first pipe opening and is used to transmit optical signals; The optical receiver is embedded in the second pipe opening and is used to receive optical signals; The optical component is arranged in the inner cavity of the round square tube and includes a filter; The filter has a linear relationship between the filtered wavelength and the optical power loss, and the slope of the linear relationship is a negative number. The filter is used to adjust the optical power output by the optical module according to the linear relationship so that the optical power output by the optical module is the same at different temperatures.

2. The optical module according to claim 1, wherein: A light emitting chip is provided in the light emitter, and the wavelength emitted by the light emitting chip increases as the temperature increases.

3. The optical module according to claim 2, wherein: The operating current of the light emitting chip increases with the addition of the filter.

4. The optical module according to claim 1, wherein: The optical assembly also includes an isolator and a filter reflector; The isolator is arranged between the light emitter and the optical filter, or between the optical filter and the filter reflector; The filter reflector is arranged below the optical receiver and is used to reflect the optical signal to the optical receiver.

5. The optical module according to claim 1, wherein: The optical transceiver submodule also includes an optical fiber adapter; The optical fiber adapter is embedded in the third tube opening of the round square tube body and is used for connecting the optical fiber.

6. The optical module according to claim 1, wherein: A lens is also provided in the light emitter.

7. An optical module, characterized in that: include: circuit boards; an optical transceiver sub-module, electrically connected to the circuit board; The optical transceiver submodule includes a round square tube body, an optical transmitter, an optical receiver and an optical component; The square tube body is provided with a first tube opening and a second tube opening; The optical transmitter is embedded in the first pipe opening and is used to transmit optical signals; The optical receiver is embedded in the second pipe opening and is used to receive optical signals; The optical component is arranged in the inner cavity of the round square tube and includes a filter; The filter has a smaller optical power loss when the wavelength it filters is longer, and a larger optical power loss when the wavelength it filters is shorter. The filter is used to adjust the optical power output by the optical module so that the optical power output by the optical module is the same at different temperatures.

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