Photoelectric conversion module, light source and optical communication equipment

Abstract

The embodiment of the invention provides a photoelectric conversion module, a light source and optical communication equipment. The output optical power and the extinction ratio can be effectively improved. The photoelectric conversion module comprises a driving module, a light source and a filtering module. Firstly, a driving module is used for sending a modulation electric signal to a light source, then the light source sends a modulation optical signal to a filtering module according to the modulation electric signal, the frequency of the modulation optical signal comprises a first frequency and a second frequency, the first frequency corresponds to the bit value 1 in the modulation electric signal, and the second frequency corresponds to the bit value 0 in the modulation electric signal; then, the filtering module does not form a structure of an optical resonant cavity, but filters the modulated optical signal based on a filtering spectrum so as to output a filtering optical signal, a modulated optical signal with a first frequency, a modulated optical signal corresponding to a first transmittance in the filtering spectrum, a modulated optical signal with a second frequency, and a modulated optical signal corresponding to a second transmittance in the filtering spectrum; the first transmittance is greater than the second transmittance.

Description

Technical Field

[0001] The present application relates to the field of optical fiber communications, and in particular to a photoelectric conversion module, a light source, and an optical communication device. Background Art

[0002] In order to improve the extinction ratio of a directly modulated laser (DML), the driving current that drives the DML to emit light is low, thereby reducing the optical power output by the DML. To this end, a chirp management laser (CML) with a filtering function is provided. The CML adds a Fabry-Perot (FP) etalon on the basis of the DML. The FP etalon includes an optical resonant cavity, which can filter the optical signal emitted by the DML, thereby improving the extinction ratio and driving current of the CML, and thus improving the optical power output by the CML.

[0003] However, the FP etalon forms an optical resonant cavity, which results in a complex structure and larger volume, thereby reducing the integration of the CML. The optical resonant cavity has a periodic filtering spectrum, which changes with temperature. The FP etalon needs to be temperature-controlled, otherwise the filtering spectrum of the FP etalon will change, which will reduce the extinction ratio of the CML. If the FP etalon needs to be temperature-controlled, a heat sink for temperature control of the FP etalon needs to be set in the CML. The heat sink will increase the volume of the CML and reduce the integration of the CML. Summary of the invention

[0004] The embodiments of the present application provide a photoelectric conversion module, a light source and an optical communication device, which can effectively improve the output optical power and the extinction ratio.

[0005] In the first aspect, the embodiment of the present application provides a photoelectric conversion module, comprising a driving module, a light source and a filtering module, wherein the driving module is connected to the light source. First, the driving module is used to send a modulated electrical signal to the light source, and then the light source is used to send a modulated optical signal to the filtering module according to the modulated electrical signal, wherein the frequency of the modulated optical signal includes a first frequency and a second frequency, wherein the first frequency corresponds to a bit value of 1 in the modulated electrical signal, and the second frequency corresponds to a bit value of 0 in the modulated electrical signal; then, the filtering module does not form an optical resonant cavity structure, but filters the modulated optical signal based on a filtering spectrum to output a filtered optical signal, wherein the modulated optical signal having the first frequency corresponds to a first transmittance in the filtering spectrum, and the modulated optical signal having the second frequency corresponds to a second transmittance in the filtering spectrum, and the first transmittance is greater than the second transmittance.

[0006] By adopting the present aspect, the extinction ratio of the modulated optical signal output by the light source is improved through the filtering module, which effectively increases the size of the driving current, and the driving current is used to drive the light source to emit light, thereby effectively increasing the output optical power of the light source to meet the needs of long-distance transmission. In addition, because the filtering module does not need to form a periodic filtering structure of the optical resonant cavity, the filtering module can effectively suppress the change of the filtering spectrum when the temperature changes. In the photoelectric conversion module, there is no need to configure a radiator for controlling the temperature of the filtering module, which reduces the structural complexity and volume of the photoelectric conversion module and improves the integration of the photoelectric conversion module.

[0007] Based on the first aspect, in an optional implementation, the photoelectric conversion module includes an output optical waveguide, the filtered optical signal is emitted from the photoelectric conversion module via the output optical waveguide, and the filtering module is included between the light source and the output optical waveguide.

[0008] As shown in this implementation, the extinction ratio and optical power of the modulated optical signal output by the light source are improved through the filter module located between the light source and the output optical waveguide.

[0009] Based on the first aspect, in an optional implementation, the photoelectric conversion module also includes a lens group, the lens group is located between the light source and the output optical waveguide, the filtering module is located between the light source and the lens group, and / or the filtering module is located between the lens group and the output optical waveguide.

[0010] According to the implementation, the extinction ratio and optical power of the modulated optical signal output by the light source are improved by at least one filtering module located between the light source and the lens group and between the lens group and the output optical waveguide.

[0011] Based on the first aspect, in an optional implementation, the photoelectric conversion module also includes an optical isolator, which is located between the light source and the output optical waveguide, the filtering module is located between the light source and the optical isolator, and / or the filtering module is located between the optical isolator and the output optical waveguide.

[0012] According to the implementation, the extinction ratio and optical power of the modulated optical signal output by the light source are improved by at least one filtering module located between the light source and the optical isolator and between the optical isolator and the output optical waveguide.

[0013] Based on the first aspect, in an optional implementation, the photoelectric conversion module includes an output optical waveguide, the output optical waveguide having a light entrance surface and a light exit surface, the light entrance surface faces the light source, the light exit surface is used to emit the filtered light signal, the filtering module covers the light entrance surface and / or the light exit surface, and the output optical waveguide has the filtering spectrum.

[0014] By adopting this implementation, the output optical module can effectively improve the extinction ratio and optical power of the modulated optical signal output by the light source.

[0015] Based on the first aspect, in an optional implementation, the photoelectric conversion module further includes a lens group, the filtering module covers a surface of at least one lens included in the lens group, and the lens covered by the filtering module has the filtering spectrum.

[0016] As shown in this implementation, the lens that has covered the filter module can effectively improve the extinction ratio and optical power of the modulated optical signal output by the light source.

[0017] Based on the first aspect, in an optional implementation, the photoelectric conversion module also includes an optical isolator, the optical isolator includes a first port and a second port, the first port faces the light source, the second port is used to emit the filtered light signal, the filtering module covers the first port and / or the second port, and the optical isolator has the filtering spectrum.

[0018] As shown in this implementation, the optical isolator can effectively improve the extinction ratio and optical power of the modulated optical signal output by the light source.

[0019] Based on the first aspect, in an optional implementation, the filtering module includes a first submodule and a second submodule, the first submodule has a first sub-filter spectrum, and the second submodule has a second sub-filter spectrum; the first sub-filter spectrum and the second sub-filter spectrum are spliced ​​to form the filtering spectrum, or the intersection of the first sub-filter spectrum and the second sub-filter spectrum is the filtering spectrum.

[0020] According to the implementation, the modulated optical signal is filtered multiple times by at least the first submodule and the second submodule to obtain a filtered optical signal, thereby improving the efficiency and accuracy of filtering the modulated optical signal and ensuring an improvement in the extinction ratio.

[0021] Based on the first aspect, in an optional implementation manner, the filtered spectrum includes a passband frequency range and at least one stopband frequency range, the first frequency is located in the passband frequency range, and the second frequency is located in the stopband frequency range.

[0022] As shown in this implementation, the filter spectrum is a single-period structure, and there is no need to filter based on an optical resonant cavity. The filter module can effectively suppress the change of the filter spectrum when the temperature changes. In the photoelectric conversion module, there is no need to configure a heat sink for controlling the temperature of the filter module, which reduces the structural complexity and volume of the photoelectric conversion module and improves the integration of the photoelectric conversion module.

[0023] In the second aspect, the embodiment of the present application provides a light source, including a housing, a laser and a filtering module, wherein the laser and the filtering module are encapsulated inside the housing; the laser is used to receive a modulated electrical signal, and is used to send a modulated optical signal to the filtering module according to the modulated electrical signal, wherein the frequency of the modulated optical signal includes a first frequency and a second frequency, wherein the first frequency corresponds to a bit value of 1 in the modulated electrical signal, and the second frequency corresponds to a bit value of 0 in the modulated electrical signal; the filtering module is used to filter the modulated optical signal based on a filtering spectrum to output a filtered optical signal, wherein the modulated optical signal having the first frequency corresponds to a first transmittance in the filtering spectrum, and the modulated optical signal having the second frequency corresponds to a second transmittance in the filtering spectrum, and the first transmittance is greater than the second transmittance. For the description of the beneficial effects of this embodiment, please refer to the first aspect, and no further description will be given.

[0024] Based on the second aspect, in an optional implementation, the housing has a light outlet, the filtered light signal is emitted from the light source via the light outlet, and the filter module is included between the laser and the light outlet.

[0025] Based on the second aspect, in an optional implementation, the light source also includes a lens group, the lens group is located between the laser and the light outlet, the filter module is located between the laser and the lens group, and / or the filter module is located between the lens group and the light outlet.

[0026] Based on the second aspect, in an optional implementation, the light source also includes an optical isolator, which is located between the laser and the light outlet, the filtering module is located between the laser and the optical isolator, and / or the filtering module is located between the optical isolator and the light outlet.

[0027] Based on the second aspect, in an optional implementation manner, the housing has a light outlet, the filter module covers the light outlet, and the light outlet has the filter spectrum.

[0028] Based on the second aspect, in an optional implementation, the light source further includes a lens group, the filter module covers a surface of at least one lens included in the lens group, and the lens covered by the filter module has the filter spectrum.

[0029] Based on the second aspect, in an optional implementation, the light source also includes an optical isolator, the optical isolator includes a first port and a second port, the first port faces the laser, the second port is used to emit the filtered light signal, the filtering module covers the first port and / or the second port, and the optical isolator has the filtering spectrum.

[0030] In a third aspect, an embodiment of the present application provides a photoelectric conversion module, which includes a driving module and a light source as shown in the second aspect, and the driving module is connected to the laser; the driving module is used to send the modulated electrical signal to the laser.

[0031] In a fourth aspect, an embodiment of the present application provides an optical component, which includes an output optical waveguide, a light source and a filtering module; the light source is used to receive a modulated electrical signal, and send a modulated optical signal to the filtering module according to the modulated electrical signal, the frequency of the modulated optical signal includes a first frequency and a second frequency, the first frequency corresponds to a bit value of 1 in the modulated electrical signal, and the second frequency corresponds to a bit value of 0 in the modulated electrical signal; the filtering module is used to filter the modulated optical signal based on a filtering spectrum to output a filtered optical signal, the modulated optical signal with the first frequency corresponds to a first transmittance in the filtering spectrum, the modulated optical signal with the second frequency corresponds to a second transmittance in the filtering spectrum, and the first transmittance is greater than the second transmittance.

[0032] In a fifth aspect, an embodiment of the present application provides an optical component, comprising an output optical waveguide and a light source as described in any one of the second aspects, wherein the output optical waveguide is used to emit the filtered optical signal from the light source.

[0033] In a sixth aspect, an embodiment of the present application provides an optical communication device, comprising a processor and a photoelectric conversion module, the photoelectric conversion module being as described in any one of the first aspect above, or the photoelectric conversion module being as described in the third aspect above; the photoelectric conversion module also comprising a photodetector and an amplifier, the processor being connected to the driving module, the processor, the amplifier and the photodetector being connected in sequence, the processor being used to send a first service electrical signal to the driving module, and the driving module being used to send the modulated electrical signal to the light source according to the first service electrical signal; the photodetector being used to receive a service optical signal, converting the service optical signal into a second service electrical signal, and sending the second service electrical signal to the amplifier; the amplifier being used to amplify the power of the second service electrical signal to obtain an amplified second service electrical signal, and sending the amplified second service electrical signal to the processor.

[0034] In the seventh aspect, the embodiment of the present application provides a transmission module, the transmission module includes an outer shell, the outer shell has an optical inlet and an optical outlet, the optical inlet is used to connect the input optical cable, the optical outlet is used to connect the output optical cable, and a filtering module is fixed inside the outer shell; the input optical cable is used to receive an input optical signal, the frequency of the input optical signal includes a first frequency and a second frequency, the first frequency corresponds to a bit value of 1, and the second frequency corresponds to a bit value of 0; the filtering module is used to filter the input optical signal based on a filtering spectrum to send an optical signal to the output optical cable, the input optical signal with the first frequency corresponds to a first transmittance in the filtering spectrum, the input optical signal with the second frequency corresponds to a second transmittance in the filtering spectrum, and the first transmittance is greater than the second transmittance. The output optical cable is used to output the filtered optical signal. For the description of the beneficial effects of this aspect, please refer to the first aspect, and no further details will be given.

[0035] In an eighth aspect, an embodiment of the present application provides an optical communication system, wherein the optical communication system comprises multiple optical communication devices as shown in the sixth aspect.

[0036] In a ninth aspect, an embodiment of the present application provides an optical communication system, which includes a plurality of optical communication devices, and a transmission module as shown in the seventh aspect is connected between two optical communication devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a structural example diagram of an optical communication system;

[0038] Figure 2 This is a diagram showing an example structure of the first embodiment of the photoelectric conversion module provided in this application;

[0039] Figure 3a A time domain diagram of a modulated optical signal provided for this application;

[0040] Figure 3b An example diagram of the first filtering spectrum of the filtering module provided in this application;

[0041] Figure 3c A comparative example diagram of a spectrum diagram of a modulated optical signal and a spectrum diagram of a filtered optical signal provided in the present application;

[0042] Figure 4 An example diagram of the structure of an embodiment of the filtering module provided in this application;

[0043] Figure 5 This is a diagram showing a second embodiment of the structure of the photoelectric conversion module provided in the present application;

[0044] Figure 6This is a structural example diagram of a third embodiment of the photoelectric conversion module provided in this application;

[0045] Figure 7 This is a structural example diagram of a fourth embodiment of the photoelectric conversion module provided in this application;

[0046] Figure 8 This is a structural example diagram of the fifth embodiment of the photoelectric conversion module provided in this application;

[0047] Fig. 9 This is a structural example diagram of the sixth embodiment of the photoelectric conversion module provided in the present application;

[0048] Fig.10 This is a structural example diagram of the seventh embodiment of the photoelectric conversion module provided in the present application;

[0049] Fig.11 An example diagram of the second filtering spectrum of the filtering module provided in this application;

[0050] Fig.12 This is an example diagram of the third filtering spectrum of the filtering module provided in this application;

[0051] Fig.13 This is a fourth example diagram of the filtering spectrum of the filtering module provided in this application;

[0052] Fig.14 An overall structural example diagram of an embodiment of a light source provided in this application;

[0053] Fig.15 This is a top view of an exemplary structure of an embodiment of a light source provided in the present application;

[0054] Fig.16 An example diagram of the structure of an embodiment of the optical communication device provided in this application;

[0055] Fig.17 This is an example diagram of the structure of an embodiment of the transmission module provided in this application. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0057] The embodiment of the present application provides a photoelectric conversion module, which can be called an optical transceiver. The photoelectric conversion module can improve the output optical power and extinction ratio (ER).

[0058] Figure 1 This is a diagram showing an example of the structure of an optical communication system. The optical communication system 100 includes a core node (central point, CP) 101 and multiple access nodes (access point, AP) 102 connected to the CP101. The CP101 can be connected to multiple APs through one or more optical splitters. This example does not limit the number of APs included in the optical communication system 100. For example, the optical communication system 100 includes three APs 102. The CP101 includes an outer shell, a plug-in frame, a processor 111, and a CP-side optoelectronic conversion module 112. This example does not limit the form of the processor 111. For example, the processor 111 may be one or more chips, or one or more integrated circuits. For example, the processor 111 can be one or more optical digital signal processors (oDSP), field-programmable gate arrays (FPGA), application specific integrated circuits (ASIC), system on chip (SoC), central processor unit (CPU), network processor (NP), microcontroller unit (MCU), programmable logic device (PLD) or other integrated chips, or any combination of the above chips or processing modules, etc., which will not be described in detail. The processor 111 sends a service electrical signal to the CP-side optoelectronic conversion module 112. The outer shell of CP101 is used to fix the plug-in frame, and the plug-in frame is used to insert one or more CP-side optoelectronic conversion modules 112. Optionally, the CP-side optoelectronic conversion module 112 can also be integrated with the processor 111. CP101 is connected to AP102 via an external optical cable.

[0059] AP102 includes an outer shell, an AP-side photoelectric conversion module, and a processor. Exemplarily, the AP-side photoelectric conversion module can be directly plugged into the processor or integrated with the processor. This example takes the example of AP102 including an AP-side photoelectric conversion module. In other examples, AP102 may also include multiple AP-side photoelectric conversion modules. For the description of the AP102 structure in this example, please refer to the description of the CP101 structure, and the details will not be repeated.

[0060] This example does not limit the networking type of the optical communication system. For example, the optical communication system can adopt a ring network or a star network, etc., without specific limitation. This example does not limit the network to which the optical communication system 100 is applied. For example, if the optical communication system 100 shown in this example is applied to a passive optical network (PON), the AP can be an optical network unit (ONU) or an optical network terminal (ONT). The core node CP101 can be an optical line terminal (OLT), a switch (for example, a core layer switch, a layer 2 switch) or a router, etc. If the optical communication system 100 is applied to an optical transport network (OTN), the CP and AP can both be OTN devices. The optical communication system 100 shown in this example can also be applied to a data center network (DCN) or a metropolitan area network, etc., without specific limitation. The optical communication system 100 shown in this example includes various optical communication devices (such as CP101 or AP102) of the device type, for example, the optical communication device can be a wireless base station, a wireless remote access device, a wireless baseband signal processing device, a computing server (referred to as a server), a high performance computer (high performance computer, HPC), a storage server or a memory resource pool, etc., without specific limitation.

[0061] The photoelectric conversion module includes a laser for emitting a light signal. In the existing scheme, in order to improve the extinction ratio and optical power of the light signal emitted by the laser, an FP etalon is provided for filtering the light signal emitted by the laser. The FP etalon is composed of a pair of flat glass coated with a reflective film and a spacer component located between the pair of flat glass. The pair of flat glass and the spacer component form an optical resonant cavity. When a beam of light signal is irradiated on the FP etalon, the light signal generates multiple reflections and refractions in the optical resonant cavity to filter the light signal emitted by the light source, thereby improving the optical power and extinction ratio of the light signal filtered by the FP etalon.

[0062] Compared with the existing solution that uses FP standard tools to filter optical signals, the photoelectric conversion module provided in this embodiment does not use FP standard tools, so that the structure of the photoelectric conversion module provided in this embodiment is simple, the volume of the photoelectric conversion module is reduced, and the integration of the photoelectric conversion module is improved. In addition, the temperature sensitivity of the filter spectrum of the photoelectric conversion module is reduced, and when the ambient temperature of the photoelectric conversion module changes, the change of the filter spectrum of the photoelectric conversion module is effectively suppressed. In the case of no need to control the temperature of the photoelectric conversion module, the output optical power and extinction ratio of the photoelectric conversion module are effectively improved.

[0063] Figure 2 The first embodiment of the photoelectric conversion module provided in the present application is a structural example diagram. The photoelectric conversion module 200 shown in this embodiment includes a substrate 211, and the substrate 211 is used to encapsulate the various components included in the photoelectric conversion module 200. For example, the photoelectric conversion module 200 includes a processor 204, a driving module 202, a heat sink 203, a light source 201, a lens group, a filter module 207, and an optical isolator 208. The substrate 211 is used to encapsulate the processor 204, the driving module 202, the heat sink 203, the light source 201, the lens group, the filter module 207, and the optical isolator 208. The number of substrates 211 is not limited in this embodiment. Among them, the substrate 211 can be a printed circuit board (PCB) or a switch substrate (switchsubstrate). The packaging type of the photoelectric conversion module is not limited in this embodiment. For example, the packaging type of the photoelectric conversion module can adopt a transistor-outline can (TO CAN) or a butterfly Burke (BOX) package.

[0064] The processor 204, the driving module 202 and the heat sink 203 are packaged on the surface of the substrate 211 shown in this embodiment, and the light source 201 is packaged on the surface of the heat sink 203. Among them, the driving module 202 can also be called a driver (Driver, DRV), which is not specifically limited. The light source 201 is used to package a laser. The heat sink 203 can also be packaged inside the light source, which is not specifically limited. The substrate 211 includes one or more layers of plates, and each plate has a single-sided or double-sided layout of conductive traces. This embodiment does not limit the type of plate. For example, the plate can be a paper base, a glass fiber cloth base, a composite base, a ceramic base, a metal core base, etc. Based on the conductive traces of the substrate 211, the electrical connection between the processor 204, the driving module 202 and the heat sink 203 is realized. Among them, the heat sink 203 includes at least one of an air cooling system, a water cooling system, a semiconductor refrigerator (thermo electric cooler, TEC), a heat sink or an electric refrigerator. The heat sink 203 is used to control the central wavelength of the optical signal emitted by the light source 201 to be in a stable state, suppress the drift degree of the wavelength emitted by the light source 201, and thus ensure the stability of the peak optical power output by the light source 201, and avoid the peak optical power output by the light source 201 from decreasing. In this embodiment, the type of laser included in the light source 201 is DML as an example to reduce the cost of the photoelectric conversion module. It should be clear that the description of the type of laser included in the light source 201 in this embodiment is an optional example and is not limited. Optionally, the photoelectric conversion module shown in this embodiment also includes a temperature detection element 205, which is encapsulated on the surface of the heat sink 203 and is used to detect the temperature of the light source 201. For example, if the temperature of the light source 201 changes, the electrical properties of the temperature detection element 205, such as voltage, current or resistance, change. The processor 204 senses that the electrical properties of the temperature detection element 205 have changed, and will control the temperature of the heat sink 203 to keep the temperature of the light source 201 within a constant temperature range to ensure the stability of the wavelength of the optical signal emitted by the light source 201. The present embodiment does not limit the type of the temperature detection element 205. For example, the temperature detection element 205 may be a thermistor. The present embodiment takes the processor 204 and the driving module 202 as two chips respectively packaged on the surface of the substrate 211 as an example. In other examples, the processor 204 and the driving module 202 may also be packaged on the surface of the substrate 211 in the form of the same chip. The photoelectric conversion module 200 shown in the present embodiment may also not be provided with the processor 204, and the processor of the optical communication device (for example, Figure 1 The processor shown in FIG. 2 is used to control the driving module 202 and the heat sink 203 .

[0065] The driving module 202 is used to send a modulated electrical signal to the light source 201. The light source 201 uses the modulated electrical signal for modulation, that is, the light source 201 responds to the modulated electrical signal from the driving module 202 to output a modulated optical signal. The modulated electrical signal includes a service for sending to a downstream node. For example, if the photoelectric conversion module 200 is located at Figure 1 In the CP101 shown in FIG. 1 , the modulated electrical signal includes the service that CP101 is used to send to AP102. For another example, if the optoelectronic conversion module 200 is located at Figure 1 In the AP102 shown, the modulated electrical signal includes the service that AP102 uses to send to CP101. Specifically, the modulated electrical signal includes a sequence of bit values ​​1 and bit values ​​0. The bit value 1 can be represented by a high voltage level, and the bit value 0 can be represented by a low voltage level. This embodiment does not limit the modulation format of the modulated electrical signal. For example, the modulation format of the modulated electrical signal can be non-return-to-zero (NRZ) or pulse amplitude modulation (PAM).

[0066] The photoelectric conversion module 200 shown in this embodiment also includes a first lens group 206 and a filtering module 207. Among them, the first lens group 206 includes at least one lens, and this embodiment does not limit the number and type of lenses included in the first lens group 206. For example, the lens may be a spherical lens or a non-spherical lens. The modulated light signal emitted by the light source 201 is incident on the filtering module 207 after being collimated by the first lens group 206. It can be understood that the first lens group 206 shown in this embodiment is located on the transmission light path of the modulated light signal emitted from the light source 201, and the filtering module 207 is located on the transmission light path of the collimated modulated light signal emitted from the first lens group 206. The filtering module 207 shown in this embodiment filters the modulated light signal to obtain a filtered light signal. The filtering module 207 shown in this embodiment can improve the extinction ratio of the filtered light signal, as described below:

[0067] Figure 3a This is a time domain diagram of the modulated optical signal provided in this application. Figure 3a The time domain diagram describes the frequency of the modulated light signal output by the light source 201, as it changes over time. Specifically, after the light source 201 receives the driving electrical signal from the driving module 202, it obtains the modulated light signal according to the modulated electrical signal. The frequency of the modulated light signal includes a first frequency f1 and a second frequency f2, wherein the first frequency f1 corresponds to a bit value of 1 in the modulated electrical signal, and the second frequency f2 corresponds to a bit value of 0 in the modulated electrical signal. Figure 3aIn the figure, the first frequency f1 corresponds to a peak, and the second frequency f2 corresponds to a trough. The peak corresponding to the first frequency f1 indicates the transmission of a bit value of 1 in the modulated electrical signal, and the trough corresponding to the second frequency f2 indicates the transmission of a bit value of 0 in the modulated electrical signal. The frequency interval 301 between the peak corresponding to the frequency f1 and the trough corresponding to the second frequency f2 is called an adiabatic chirp. The adiabatic chirp of the modulated optical signal output by the light source 201 is relatively high. During the transmission process of the optical communication system, the modulated optical signal with a high adiabatic chirp will be distorted due to the fiber dispersion, thereby causing the signal quality of the modulated optical signal to be seriously degraded, so that the transmission distance of the modulated optical signal cannot meet the requirements of long-distance transmission.

[0068] To meet the requirement of long-distance transmission, the filtering module 207 shown in this embodiment filters the modulated optical signal to improve the extinction ratio of the filtered optical signal. Figure 3b This is an example diagram of the first filtering spectrum of the filtering module provided in this application. Figure 3b The horizontal axis shows the frequency, and the vertical axis shows the transmittance corresponding to each frequency. Figure 3b In the filtering spectrum shown, the modulated light signal with the first frequency f1 corresponds to the first transmittance K1, the modulated light signal with the second frequency f2 corresponds to the second transmittance K2, and the first transmittance K1 is greater than the second transmittance K2. In this embodiment, the filtering spectrum has a passband frequency range and a stopband frequency range. In this embodiment, a stopband frequency range, a passband frequency range and another stopband frequency range are arranged in sequence in the order of increasing frequency in the filtering spectrum as an example. It can be understood that the passband frequency range is located between the two stopband frequency ranges. The first frequency f1 is within the passband frequency range, and the second frequency f2 is within the stopband frequency range. The transmittance corresponding to any frequency within the passband frequency range is greater than the transmittance corresponding to any frequency within the stopband frequency range.

[0069] Figure 3c Comparative example diagrams of the spectrum diagram of the modulated optical signal and the spectrum diagram of the filtered optical signal provided in the present application. The spectrum diagram 311 of the modulated optical signal illustrates the change of the optical power of the modulated optical signal over time. The spectrum diagram 312 of the optical signal illustrates the change of the optical power of the filtered optical signal over time. In the spectrum diagram 311 of the modulated optical signal, the first optical power P1 corresponding to the bit value of 1 in the modulated electrical signal is filtered by the first transmittance K1 of the filtering module 207 to obtain the third optical power P3. The second optical power P2 corresponding to the bit value of 0 in the modulated electrical signal is filtered by the second transmittance K2 of the filtering module 207 to obtain the fourth optical power P4. For example, the first transmittance K1 = 95%, then the third optical power P3 = the first optical power P1*95%. For another example, the second transmittance K2 = 20%, then the fourth optical power P4 = the second frequency P2*20%.

[0070] In this embodiment, the adiabatic chirp can be reduced by improving the extinction ratio of the filtered optical signal. The extinction ratio of the filtered optical signal is defined as the ratio between the third optical power P3 and the fourth optical power P4 of the filtered optical signal. That is, the extinction ratio of the filtered optical signal = optical power P4 / P3. It can be understood that in the modulated optical signal, the first optical power P1 corresponding to the bit value of 1 passes through with low loss within the passband frequency range of the filter spectrum of the filter module 207, while the second optical power P2 corresponding to the bit value of 0 passes through with high loss within the stopband frequency range of the filter spectrum of the filter module 207, so that the second optical power P2 corresponding to the bit value of 0 passes through the filter spectrum of the filter module 207. It will be greatly attenuated, then, in the filtered optical signal, the difference between the third optical power P3 corresponding to the bit value of 1 and the fourth optical power P4 corresponding to the bit value of 0 is enlarged, thereby improving the extinction ratio of the filtered optical signal. Since the extinction ratio of the filtered optical signal emitted by the filter module 207 is improved, the adiabatic chirp of the filtered optical signal is effectively reduced, so that the filtered optical signal can meet the requirements of long-distance transmission.

[0071] The heat sink 203 shown in this embodiment can ensure that the first frequency f1 is always within the passband frequency range of the filter spectrum of the filter module 207 by controlling the temperature of the light source 201, so that the optical power of the first frequency f1 always passes through the filter spectrum with low loss. The heat sink 203 can also ensure that the second frequency f2 is always within the stopband frequency range of the filter spectrum of the filter module 207 by controlling the temperature of the light source 201, so that the second frequency f2 always passes through the filter spectrum with high loss.

[0072] The filter module 207 shown in this embodiment does not need to form an optical resonant cavity structure, so the filter spectrum of the filter module 207 is a single-period structure. The single-period structure means that the filter spectrum of the filter module 207 only includes one passband frequency range. That is, the filter module 207 is not a periodic filtering structure (such as the existing FP standard), so the filter module 207 can effectively suppress the change of the filter spectrum when the temperature changes. In the photoelectric conversion module, there is no need to configure a radiator for controlling the temperature of the filter module 207, which reduces the structural complexity and volume of the photoelectric conversion module and improves the integration of the photoelectric conversion module.

[0073] The filtering spectrum shown in this embodiment satisfies the three conditions shown below. Condition 1: The filtering spectrum has a passband frequency range and at least one stopband frequency range. Condition 2: The first frequency f1 is within the passband frequency range, and the second frequency f2 is within the stopband frequency range. Condition 3: The transmittance corresponding to any frequency within the passband frequency range is greater than the transmittance corresponding to any frequency within the stopband frequency range. This embodiment takes the filtering spectrum of the filtering module 207 as an example of a curved structure, and the specific structure is not limited. For example, the filtering spectrum has one or more straight line structures with a certain slope.

[0074] Figure 4 This is a diagram showing an example of the structure of a filter module provided in the present application. The filter module 207 shown in this embodiment includes a base 401 and an optical filter 402 formed by coating the side wall of the base 401. The base 401 shown in this embodiment is made of any transparent material, such as glass, to ensure that the base 401 does not change the transmission path of the optical signal. The optical filter 402 can be composed of one or more layers of thin films, and the thickness and refractive index of the different films can be used to obtain the following: Figure 3b The present embodiment takes the optical filter 402 coated on the surface of the base 401 facing the first lens group 206 as an example. In other examples, the optical filter 402 may also be coated on the surface of the base 401 facing away from the first lens group 206 .

[0075] The photoelectric conversion module 200 also includes an optical isolator 208, a second lens group 209 and an output optical waveguide 212. The output optical waveguide 212 can also be referred to as a fiber array unit (FAU). Among them, the filter module 207 is located between the first lens group 206 and the optical isolator 208. The filtered optical signal emitted by the filter module 207 is sent to the optical isolator 208. The filtered optical signal can be sent to the second lens group 209 through the optical isolator 208. The optical isolator 208 can allow the filtered optical signal to pass successfully, and prevent the reflected light outside the photoelectric conversion module 200 from passing through the optical isolator 208 to cause interference to the light source 201, effectively ensuring the working performance of the light source 201. The second lens group 209 includes one or more lenses, and the present embodiment does not limit the number of lenses included in the second lens group 209. The second lens group 209 converges the filtered optical signal to the output optical waveguide 212. Specifically, the outer frame of the photoelectric conversion module 200 has an optical fiber adapter. The optical fiber adapter is used to insert and fix the optical fiber connector 210. When the optical fiber connector 210 is inserted into the optical fiber adapter, the output optical waveguide 212 is connected to the optical fiber connector 210, and the transmission of the filtered optical signal can be realized. The specific type of the optical fiber connector 210 shown in this embodiment can be any of the following. It should be clear that the description of the type of the optical fiber connector 210 in this embodiment is an optional example and is not limited:

[0076] Multi fiber push on (MPO) type fiber optic connector, ferrule connector (FC) type fiber optic connector, square connector (SC) type fiber optic connector, lucent connector (LC) type fiber optic connector, straight tip (ST) type fiber optic connector or fiber distributed data interface (IFDD) type fiber optic connector.

[0077] One end of the optical fiber connector 210 is connected to the output optical waveguide 212, and the other end is connected to the external optical cable 213, and the optical signal transmission between the output optical waveguide 212 and the external optical cable 213 is realized through the optical fiber connector 210. Figure 1 In the example shown, the external optical cable 213 of the optical fiber connector 210 is connected to the optical splitter. Optionally, in other examples, the optical fiber conversion module 200 includes the optical fiber connector 210 inside, so that the external optical cable connected to the optical fiber connector 210 is led out from the outer frame of the optical fiber conversion module.

[0078] It should be noted that the description of the chip type included in the photoelectric conversion module in this embodiment is an optional example and is not limited. For example, the photoelectric conversion module 200 may also include a trans-impedance amplifier (TIA) or an optical coupler.

[0079] The type of laser included in the light source shown in this embodiment is DML, which can effectively reduce the volume and power consumption of the light source, reduce the cost of the photoelectric conversion module, and improve the reliability of the light source compared to the electric absorption modulated laser (EML).

[0080] In order to improve the extinction ratio of the existing DML, the magnitude of the driving current emitted by the driving module to the DML is close to the emission threshold of the DML. The emission threshold refers to the minimum current value of the DML conduction. It can be understood that in order to improve the extinction ratio, the driving current of the existing DML is limited by the emission threshold, so that even if the extinction ratio of the optical signal emitted by the DML is improved, the magnitude of the driving current is reduced, thereby reducing the output optical power of the DML. The photoelectric conversion module shown in this embodiment uses a filtering module to filter the modulated optical signal output by the light source, and achieves the purpose of improving the extinction ratio by filtering the modulated optical signal. Because the extinction ratio is improved by the filtering module shown in this embodiment, so that the driving current can break through the limitation of the emission threshold of the light source, then there is no need to improve the extinction ratio by reducing the driving current. This embodiment increases the magnitude of the driving current, thereby effectively increasing the output optical power of the light source, so that the photoelectric conversion module shown in this embodiment achieves adiabatic chirp suppression. Because this embodiment can increase the output optical power of the light source, the increase in optical power can effectively compensate for the attenuation caused by the transmission process of the optical signal output by the photoelectric conversion module to meet the needs of long-distance transmission.

[0081] The filtering module shown in this embodiment filters the modulated optical signal based on the filtering spectrum. Moreover, the filtering module shown in this embodiment does not need to implement filtering based on the optical resonant cavity of the FP standard, thereby reducing the structural complexity and volume of the photoelectric conversion module, improving the integration of the photoelectric conversion module, and facilitating the miniaturization of the photoelectric conversion module. This embodiment can formulate a filtering spectrum according to filtering requirements, so that the filtering module can meet the filtering requirements of high-speed signals of 10 Gigabit Ethernet (10GE) or above.

[0082] exist Figure 2 In the embodiment shown, the filter module 207 is an independent device, which is packaged between the first lens group 206 and the optical isolator 208. Figures 5 to 7 In the illustrated embodiment, the packaging position of the filter module 207 is changed.

[0083] Figure 5 This is a structural example diagram of the second embodiment of the photoelectric conversion module provided in this application. Figure 5 The photoelectric conversion module shown includes a substrate 511, a processor 504, a driving module 502, a heat sink 503, a light source 501, a temperature detection element 505, a first lens group 506, an optical isolator 508, a second lens group 509 and an output optical waveguide 512. Figure 2The corresponding description is not repeated in detail. In this embodiment, the filter module 507 is located between the light source 501 and the first lens group 506. It can be understood that the filter module 507 is located on the transmission optical path of the modulated light signal emitted by the light source 501. The filter module 507 is used to filter the modulated light signal to emit a filtered light signal. For an explanation of the filtering process of the filter module 507, please refer to Figures 2 to 4 The first lens group 506 is used to collimate the filtered light signal from the filtering module 507, and send the collimated filtered light signal to the optical isolator 508. For the description of the optical signal transmission process in the photoelectric conversion module 500 shown in this embodiment, please refer to Figure 2 The corresponding instructions are not elaborated in detail.

[0084] Figure 6 This is a structural example diagram of the third embodiment of the photoelectric conversion module provided in this application. Figure 6 The photoelectric conversion module 600 shown includes a substrate 611, a processor 604, a driving module 602, a heat sink 603, a light source 601, a temperature detection element 605, a first lens group 606, an optical isolator 608, a second lens group 609 and an output optical waveguide 612. Figure 2 The corresponding description is not repeated in detail. In this embodiment, the filtering module 607 is located between the second lens group 609 and the output optical waveguide 612. It can be understood that the second lens group 609 is used to converge the modulated optical signal and emit the converged modulated optical signal. Then, the filtering module 607 is located on the transmission optical path of the modulated optical signal emitted from the second lens group 609. The filtering module 607 is used to filter the modulated optical signal to emit the filtered optical signal. For a description of the filtering process of the filtering module 607, please refer to Figures 2 to 4 For the description of the optical signal transmission process in the photoelectric conversion module 600 shown in this embodiment, please refer to Figure 2 The corresponding instructions are not elaborated in detail.

[0085] Figure 7 This is a structural example diagram of the fourth embodiment of the photoelectric conversion module provided in this application. Figure 7 The photoelectric conversion module 700 shown includes a substrate 711, a processor 704, a driving module 702, a heat sink 703, a light source 701, a temperature detection element 705, a first lens group 706, an optical isolator 708, a second lens group 709 and an output optical waveguide 712. Figure 2The corresponding description is not repeated in detail. In this embodiment, the filter module 707 is located between the optical isolator 708 and the second lens group 709. It can be understood that the modulated optical signal of the optical isolator 708 is sent to the filter module 707, so the filter module 707 is located on the transmission optical path of the modulated optical signal emitted from the optical isolator 708. The filter module 707 is used to filter the modulated optical signal to emit a filtered optical signal. For an explanation of the filtering process of the filter module 707, please refer to Figures 2 to 4 For the description of the optical signal transmission process in the photoelectric conversion module 700 shown in this embodiment, please refer to Figure 2 The corresponding instructions are not elaborated in detail.

[0086] In the above embodiments, the filtering module is taken as an independent device packaged in the photoelectric conversion module. In the following embodiments, the filtering module is reused on the existing device in the photoelectric conversion module. Figure 8 This is a structural example diagram of the fifth embodiment of the photoelectric conversion module provided in this application. Figure 8 The photoelectric conversion module 800 shown includes a substrate 811, a processor 804, a driving module 802, a heat sink 803, a light source 801, a temperature detection element 805, a first lens group 806, an optical isolator 808, a second lens group 809 and an output optical waveguide 812. Figure 2 The corresponding description is not repeated in detail. In this embodiment, the output optical waveguide 812 has a light incident surface and a light exiting surface, and the light incident surface faces the light source 201, so that the modulated optical signal emitted by the light source 201 is incident on the light incident surface via the first lens group 806, the optical isolator 808 and the second lens group 809 in sequence. The light exiting surface is connected to the optical fiber connector 810. For the description of the optical fiber connector 810, please refer to Figure 2The corresponding description is not repeated in detail. It can be understood that the modulated optical signal emitted by the second lens group 809 is incident from the light incident surface to the output optical waveguide 812, and is transmitted through the output optical waveguide 812 to be emitted from the light exiting surface and transmitted to the optical fiber connector 810. The filter module 807 shown in this embodiment covers the light incident surface of the output optical waveguide 812. It can be understood that the filter module 807 shown in this embodiment is an optical filter, and the optical filter is coated on the light incident surface of the output optical waveguide 812. In the case where the filter module 807 covers the light incident surface of the output optical waveguide 812, the output optical waveguide 812 can be used as a filter module and filter based on the filter spectrum. In this embodiment, the position of the filter module 807 coating on the output optical waveguide 812 is not limited, as long as the filter module 807 is located on the transmission optical path of the modulated optical signal emitted from the second lens group 809. For example, the filter module 807 covers the light exiting surface of the output optical waveguide 812. For another example, the filter module 807 is coated on the outer peripheral surface of the output optical waveguide 812. For another example, the filter module 807 is inserted into the output optical waveguide 812. For a description of the optical signal transmission process in the photoelectric conversion module 800 shown in this embodiment, please refer to Figure 2 The corresponding instructions are not elaborated in detail.

[0087] Fig. 9 This is a structural example diagram of the fifth embodiment of the photoelectric conversion module provided in this application. Fig. 9 The photoelectric conversion module 900 shown includes a substrate 911, a processor 904, a driving module 902, a heat sink 903, a light source 901, a temperature detection element 905, a first lens group, an optical isolator 908, a second lens group 909 and an output optical waveguide 912. Figure 2The corresponding description is not repeated in detail. In this embodiment, taking the first lens group including a lens 906 as an example, the lens 906 has a light incident surface and a light exiting surface, the light incident surface of the lens 906 faces the light source 901, and the light exiting surface of the lens 906 faces the optical isolator 908. It can be understood that the modulated light signal emitted by the light source 901 is incident on the lens 906 from the light incident surface of the lens 906, and after being collimated by the lens 906, it is emitted from the light exiting surface of the lens 906. The filter module 907 shown in this embodiment covers the light incident surface of the lens 906. It can be understood that the filter module 907 shown in this embodiment is an optical filter, and the optical filter is coated on the light incident surface of the lens 906. In the case where the filter module 907 covers the light incident surface of the lens 906, the lens 906 can be used as a filter module and filter based on the filter spectrum. The present embodiment does not limit the position where the filter module 907 is coated on the lens 906, as long as the filter module 907 is located on the transmission optical path of the modulated optical signal emitted from the light source 901. For example, the filter module 907 covers the light exiting surface of the lens 906, and for another example, the filter module 907 is coated on the outer peripheral surface of the lens 906. The present embodiment takes the first lens group including one lens 906 as an example. In other examples, the first lens group may include multiple lenses. The filter module 907 may be coated on any lens included in the first lens group. For details, please refer to the description of the filter module 907 being coated on the lens 906, which will not be described in detail. The present embodiment takes the filter module being coated on the first lens group as an example. In other examples, the filter module may also be coated on the second lens group 909. For the description of coating the filter module on the second lens group 909, please refer to the description of coating the filter module on the first lens group, which will not be described in detail.

[0088] Fig.10 This is a structural example diagram of the sixth embodiment of the photoelectric conversion module provided in this application. Fig.10 The photoelectric conversion module 1000 shown includes a substrate 1011, a processor 1004, a driving module 1002, a heat sink 1003, a light source 1001, a temperature detection element 1005, a first lens group 1006, an optical isolator 1008, a second lens group 1009 and an output optical waveguide 1012. Figure 2The corresponding description is not repeated in detail. The optical isolator 1008 has a first port and a second port. The first port of the optical isolator 1008 faces the light source 1001, and the second port of the optical isolator 1008 faces the second lens group 1009. It can be understood that the collimated modulated optical signal emitted from the first lens group 1006 is incident on the optical isolator 1008 from the first port of the optical isolator 1008, passes through the optical isolator 1008, and then is emitted from the second port of the optical isolator 1008. The filter module 1007 shown in this embodiment covers the first port of the optical isolator 1008. It can be understood that the filter module 1007 shown in this embodiment is an optical filter, and the optical filter is coated to the first port of the optical isolator 1008. In the case where the filter module 1007 covers the first port of the optical isolator 1008, the optical isolator 1008 can be used as a filter module and filter based on the filter spectrum. This embodiment does not limit the position where the filter module 1007 is plated on the optical isolator 1008, as long as the filter module 1007 is located on the transmission optical path of the modulated optical signal emitted from the first lens group 1006. For example, the filter module 1007 covers the second port of the optical isolator 1008. For another example, the filter module 1007 is inserted into the optical isolator 1008. For the description of the optical signal transmission process in the photoelectric conversion module 1000 shown in this embodiment, please refer to Figure 2 The corresponding instructions are not elaborated in detail.

[0089] The above embodiment takes the filtering module being located at a position in the photoelectric conversion module as an example. The filtering module shown in this embodiment includes multiple sub-modules, and the multiple sub-modules are respectively packaged at different positions in the photoelectric conversion module. This embodiment does not limit the number of sub-modules included in the filtering module. In this embodiment, for the description of the position of each sub-module in the photoelectric conversion module, please refer to the position of the filtering module in the photoelectric conversion module shown in the above embodiment, and the details are not repeated. For example, the filtering module shown in this embodiment includes two sub-modules, namely a first sub-module and a second sub-module. Please refer to Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 as well as Fig.10 The description of the packaging position of the filter module shown is not repeated. The packaging positions of the first submodule and the second submodule shown in this embodiment are different in the photoelectric conversion module. The first submodule has a first sub-filter spectrum, and the second submodule has a second sub-filter spectrum. The first sub-filter spectrum and the second sub-filter spectrum are used to form the filter spectrum of the filter module shown in the above embodiment.

[0090] Fig.11This is an example diagram of the second filtering spectrum of the filtering module provided in this application. In this embodiment, in order to achieve the purpose of filtering the modulated light signal emitted by the light source, the filtering spectrum of the filtering module is Fig.11 Filter spectrum 1101 is shown. For an explanation of the filter spectrum 1101, see Figure 3b In this embodiment, the filter spectrum 1101 is filtered in the target frequency band, the starting frequency of the target frequency band is fa1, and the ending frequency is fa3. In the target frequency band of the filter spectrum 1101, the corresponding relationship between different frequencies and transmittance can be found in Figure 3b The first sub-filter spectrum of the first sub-module is Fig.11 The first sub-filter spectrum 1102 is shown, and the second sub-filter spectrum of the second submodule is Fig.11 The second sub-filter spectrum 1103 shown. The first sub-filter spectrum 1102 and the second sub-filter spectrum 1103 are spliced ​​to form the filter spectrum 1101. Specifically, the first sub-filter spectrum 1102 is filtered in the first frequency band, and the second sub-filter spectrum 1103 is filtered in the second frequency band, and the target frequency band includes the first frequency band and the second frequency band. Among them, the starting frequency of the first frequency band is fa1, the ending frequency is fa2, and the frequency fa2 is any frequency in the interval greater than the frequency fa1 and less than the frequency fa3. In the first sub-filter spectrum 1102, the corresponding relationship between the first frequency band and the transmittance is the same as the corresponding relationship between the first frequency band and the transmittance in the filter spectrum 1101. The second sub-filter spectrum 1103 is filtered in the second frequency band, and the starting frequency of the second frequency band is fa2, the ending frequency is fa3, and the frequency fa2 is any frequency in the interval greater than the frequency fa1 and less than the frequency fa3. In the second sub-filter spectrum 1103, the corresponding relationship between the second frequency band and the transmittance is the same as the corresponding relationship between the second frequency band and the transmittance in the filter spectrum 1101. This embodiment does not limit the order in which the first submodule and the second submodule filter the modulated optical signal. For example, the first submodule may filter the modulated optical signal first, and then the second submodule filters the modulated optical signal. For another example, the second submodule may filter the modulated optical signal first, and then the first submodule filters the modulated optical signal. The first submodule and the second submodule jointly filter the modulated optical signal to emit the filtered optical signal. For the process of the first submodule and the second submodule jointly filtering, please refer to Figure 3a to Figure 3c The filtering process of the filtering module shown is not described in detail.

[0091] Fig.12 This is an example diagram of the third filtering spectrum of the filtering module provided in this application. In this embodiment, in order to achieve the purpose of filtering the modulated light signal emitted by the light source, the filtering spectrum of the filtering module is Fig.12 Filter spectrum 1201 is shown. For an explanation of the filter spectrum 1201, see Figure 3b In this embodiment, the filter spectrum 1201 is filtered in the target frequency band, the starting frequency of the target frequency band is fa1, and the ending frequency is fa3. In the target frequency band of the filter spectrum 1201, the corresponding relationship between different frequencies and transmittance can be found in Figure 3b The first sub-filter spectrum of the first sub-module in this embodiment is Fig.12 The first sub-filter spectrum 1202 is shown, and the second sub-filter spectrum of the second submodule is Fig.12 The second sub-filter spectrum 1203 is shown. The intersection of the first sub-filter spectrum 1202 and the second sub-filter spectrum 1203 is the filter spectrum 1201. Specifically, the first sub-filter spectrum 1202 is filtered in the third frequency band, and the second sub-filter spectrum 1203 is filtered in the fourth frequency band. The frequency range of the third frequency band is greater than the target frequency band, and the frequency range of the fourth frequency band is greater than the target frequency band. The target frequency band is the intersection of the third frequency band and the fourth frequency band. For example, the starting frequency of the third frequency band is fb1, and the ending frequency is fb2. The starting frequency of the target frequency band is fa1, and the ending frequency is fa3. The frequencies of frequency fb1, frequency fa1, frequency fa3, and frequency fb2 increase in sequence. The starting frequency of the fourth frequency band is fc1, and the ending frequency is fc2. The frequencies of frequency fc1, frequency fa1, frequency fa3, and frequency fc2 increase in sequence. This embodiment does not limit the size relationship between frequency fb1 and frequency fc1, and the size relationship between frequency fb2 and frequency fc2. The intersection of the first sub-filter spectrum 1202 and the second sub-filter spectrum 1203 is the filter spectrum 1201, which means that the correspondence between the target frequency band and the transmittance in the first sub-filter spectrum 1202 is the same as the correspondence between the target frequency band and the transmittance in the filter spectrum 1201. Similarly, the correspondence between the target frequency band and the transmittance in the second sub-filter spectrum 1203 is the same as the correspondence between the target frequency band and the transmittance in the filter spectrum 1201. This embodiment does not limit the order in which the first submodule and the second submodule filter the modulated optical signal. For a description of the filtering order, please refer to Fig.11 The corresponding instructions are not elaborated in detail.

[0092] Fig.13 This is an example of the fourth filter spectrum of the filter module provided in this application. In this embodiment, in order to achieve the purpose of filtering the modulated light signal emitted by the light source, the filter spectrum of the filter module includes the corresponding relationship between the target frequency band (the starting frequency is fa1 and the ending frequency is fa3) and the transmittance. For details, please refer to Fig.11 The description of the filtering spectrum of 1 or 12 is not repeated in detail. In this embodiment, the first sub-filtering spectrum of the first submodule is Fig.13 The first sub-filter spectrum 1301 shown, the second sub-filter spectrum of the second submodule is Fig.13 The second sub-filter spectrum 1302 shown. The intersection of the first sub-filter spectrum 1301 and the second sub-filter spectrum 1302 is the second sub-filter spectrum 1302. Specifically, the first sub-filter spectrum 1301 is filtered in the fifth frequency band, and the second sub-filter spectrum 1302 is filtered in the target frequency band, and the frequency range of the fifth frequency band is greater than the target frequency band. Among them, the starting frequency of the fifth frequency band is fb1, and the ending frequency is fb2. The starting frequency of the target frequency band is fa1, and the ending frequency is fa3. The frequencies of frequency fb1, frequency fa1, frequency fa3 and frequency fb2 increase in sequence. The intersection of the first sub-filter spectrum 1301 and the second sub-filter spectrum 1302 is the second sub-filter spectrum 1302, which means that the corresponding relationship between the target frequency band and the transmittance in the first sub-filter spectrum 1301 is the same as the corresponding relationship between the target frequency band and the transmittance in the second sub-filter spectrum 1302. In this embodiment, it is necessary to first filter the modulated optical signal by the first sub-module, and then filter the modulated optical signal by the second sub-module. It can be understood that the first submodule first roughly filters the modulated optical signal based on the first sub-filter spectrum 1301, and the second sub-filter then finely filters the modulated optical signal based on the second sub-filter spectrum 1302, thereby improving the efficiency and accuracy of filtering the modulated optical signal and ensuring the improvement of the extinction ratio.

[0093] An embodiment of the present application provides a light source. Fig.14 The light source 1400 shown in this embodiment includes a housing, which specifically includes a base 1401 and a cap 1402. The cap 1402 is covered on the base 1401. Fig.15 This is a top view of an example structure of an embodiment of the light source provided in this application. A laser 1501 and a filter module 1502 are arranged on the base 1401. The filter module 1502 can be an independent device encapsulated in a housing. For a description of the structure, please refer to Figure 4 As shown, the details are not repeated here. The filtering module 1502 is located between the laser 1501 and the light outlet 1503 of the shell. The laser 1501 is used to send the modulated optical signal to the filtering module 1502, and the filtering module 1502 is used to filter the modulated optical signal to transmit the filtered optical signal to the light outlet 1503, and the filtered optical signal passes through the light outlet 1503 to be emitted from the light source 1400. For the description of the laser 1501 and the filtering module 1502 shown in this embodiment, as well as the description of the filtering process of the filtering module 1502, please refer to the above embodiments, and the details are not repeated here. In this embodiment, the filtering module 1502 is taken as an independent device as an example. In other examples, the filtering module 1502 can also cover the light outlet 1503. Then, the light outlet 1503 can be used as a filtering module to filter the modulated optical signal.

[0094] Optionally, the light source 1400 shown in this embodiment may include a first lens group, which is used to collimate the modulated light signal emitted by the laser 1501. For details, please refer to the description of the first lens group included in the photoelectric conversion module shown above, and no further details are given. In this example, the filtering module 1502 may be located between the laser 1501 and the first lens group. For details, please refer to Figure 5 The corresponding description is not repeated here. The filter module 1502 may also be located between the first lens group and the light outlet 1503. For details, see Figure 2 In this example, the filter module 1502 may also be an optical filter coated on the first lens group. For details, see Fig. 9 The corresponding instructions are not elaborated in detail.

[0095] For another example, the light source 1400 shown in this embodiment may include a second lens group, which is used to converge the optical signal to the light outlet 1503. For details, please refer to the description of the second lens group of the photoelectric conversion module shown in the above embodiment, and no further details are given. In this example, the filter module 1502 may be located between the laser 1501 and the second lens group. For details, please refer to Figure 6 The corresponding description is not repeated here. The filter module 1502 may also be located between the second lens group and the light outlet 1503. For details, see Figure 2 , Figure 5 or Figure 7 In this example, the filter module 1502 may also be an optical filter coated on the second lens group. For details, please refer to the description of the filter spectrum 1502 coated on the first lens group. The details are not repeated here.

[0096] For another example, the light source 1400 shown in this embodiment may include an optical isolator. For a detailed description of the optical isolator, please refer to the description of the optical isolator of the photoelectric conversion module shown in the above embodiment, and no further details will be given. In this example, the filter module 1502 may be located between the laser 1501 and the optical isolator. For a detailed description, please refer to Figure 2 , Figure 5 The corresponding description is not repeated here. The filter module 1502 may also be located between the second lens group and the light outlet 1503. For details, see Figure 6 as well as Figure 7 In this example, the filter module 1502 can also be coated on the first port or the second port of the optical isolator. For details, see Fig.10 The corresponding instructions are not elaborated in detail.

[0097] The filtering module 1502 shown in this embodiment may include multiple sub-modules. For descriptions of the multiple sub-modules and the filtering processes of the multiple sub-modules, please refer to Figures 11 to 13 The description of the device type included in the light source in this embodiment is an optional example and is not limited. In other examples, the light source may also include a reflector for changing the light path, and the filter module is also located between the laser and the reflector, or between the reflector and the light outlet, or covers the surface of the reflector.

[0098] The present application embodiment provides a photoelectric conversion module. For a description of the position of the photoelectric conversion module in an optical communication system, see Figure 1 The corresponding description is not repeated here. The photoelectric conversion module shown in this embodiment includes Fig.14 as well as Fig.15 The light source shown in the embodiment is not described in detail. For the description of the substrate, processor, drive module, lens group, optical isolator, output optical waveguide and other components included in the photoelectric conversion module shown in this embodiment, please refer to Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 as well as Fig.10 Any embodiment is shown and no further details are given.

[0099] The present application embodiment provides an optical component, which can be a bidirectional optical module (bi-directional optical sub assembly, BOSA) or a transmitter optical module (transmitter optical sub assembly, TOSA). The optical component shown in this embodiment is used to emit optical signals. The optical component includes a light source, a first lens group, an optical isolator, a second lens group, and an output optical waveguide. For details, please refer to Figures 2 to 13 The optical component shown in this embodiment also includes a filter module. For the description of the filter module structure, please refer to Figures 2 to 13 The light source of the optical assembly provided in this embodiment can also be seen in Fig.14 as well as Fig.15 As shown, the details are not repeated here.

[0100] The embodiment of the application provides an optical communication device, Fig.16An example diagram of the structure of an embodiment of the optical communication device provided in the present application. The optical communication device 1600 shown in this embodiment includes a processor 1601, a driving module 1602, a light source 1603, a filtering module 1604 and an optical isolator 1605. The processor 1601 is used to send a first business electrical signal to the driving module 1602, and the driving module 1602 is used to send the modulated electrical signal to the light source 1603 according to the first business electrical signal. For the description of the driving module 1602, the light source 1603, the filtering module 1604 and the optical isolator 1605 shown in this embodiment, please refer to the above embodiment, and the specific details will not be repeated. The optical communication device shown in this embodiment also includes an amplifier 1607 and a photodetector 1606 connected to the processor 1601 in sequence. Among them, the photodetector 1606 can be a photodiode or an avalanche photon diode (APD). The amplifier 1607 can be a trans-impedance amplifier (TIA). Specifically, the photodetector 1606 is used to receive a service optical signal, convert the service optical signal into a second service electrical signal, and send the second service electrical signal to the amplifier 1607; the amplifier is used to amplify the power of the second service electrical signal to obtain an amplified second service electrical signal, and send the amplified second service electrical signal to the processor 1601.

[0101] An embodiment of the present application provides a transmission module. Fig.17 This is an example diagram of the structure of an embodiment of the transmission module provided in the present application. The transmission module shown in this embodiment includes an outer shell 1700, and the outer shell 1700 has a light inlet 1712 and a light outlet 1713. The light inlet 1712 is used to connect to an input optical cable 1714, and the light outlet 1713 is used to connect to an output optical cable 1715. A filtering module 1711 is fixed inside the outer shell 1700. The input optical cable 1714 is used to receive an input optical signal from a first optical communication device 1701, and the frequency of the input optical signal includes a first frequency and a second frequency, the first frequency corresponds to a bit value of 1, and the second frequency corresponds to a bit value of 0. The filtering module 1711 is used to filter the input optical signal based on a filtering spectrum to send a filtered optical signal to the output optical cable 1715; the output optical cable 1715 is used to send the filtered optical signal to the second optical communication device 1702. For a description of the first optical communication device 1701 and the second optical communication device 1702, see Figure 1The corresponding description is not repeated here. For the description of the filtering module 1711 and the filtering process, please refer to the above embodiment, and the details are not repeated here. In this embodiment, in the optical communication system, one or more transmission modules are connected between two optical communication devices, and the transmission module can filter the received optical signal through the filtering module, thereby improving the extinction ratio of the filtered optical signal output by the transmission module to meet the needs of long-distance transmission.

[0102] The present application embodiment provides an optical communication system, wherein the optical communication system includes a plurality of optical communication devices. For descriptions of the optical communication devices, see Fig.16 As shown, the details are not repeated here.

[0103] The embodiment of the present application provides an optical communication system, wherein the optical communication device includes a plurality of optical communication devices and at least one transmission module connected between two optical communication devices. For a description of the optical communication device, see Fig.16 For a description of the transport module, see Fig.17 The details are as mentioned above and will not be elaborated here.

[0104] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A photoelectric conversion module, characterized in that: It includes a driving module, a light source and a filtering module, wherein the driving module is connected to the light source; The driving module is used to send a modulated electrical signal to the light source, and the light source is used to send a modulated optical signal to the filtering module according to the modulated electrical signal, wherein the frequency of the modulated optical signal includes a first frequency and a second frequency, wherein the first frequency corresponds to a bit value of 1 in the modulated electrical signal, and the second frequency corresponds to a bit value of 0 in the modulated electrical signal; The filtering module is used to filter the modulated light signal based on a filtering spectrum to output a filtered light signal, wherein the modulated light signal having the first frequency corresponds to a first transmittance in the filtering spectrum, and the modulated light signal having the second frequency corresponds to a second transmittance in the filtering spectrum, and the first transmittance is greater than the second transmittance.

2. The photoelectric conversion module according to claim 1, characterized in that: The photoelectric conversion module includes an output optical waveguide, the filtered optical signal is emitted from the photoelectric conversion module via the output optical waveguide, and the filtering module is included between the light source and the output optical waveguide.

3. The photoelectric conversion module according to claim 2, characterized in that: The photoelectric conversion module further comprises a lens group, wherein the lens group is located between the light source and the output optical waveguide, the filter module is located between the light source and the lens group, and / or the filter module is located between the lens group and the output optical waveguide.

4. The photoelectric conversion module according to claim 2 or 3, characterized in that: The photoelectric conversion module further includes an optical isolator, which is located between the light source and the output optical waveguide, the filtering module is located between the light source and the optical isolator, and / or the filtering module is located between the optical isolator and the output optical waveguide.

5. The photoelectric conversion module according to any one of claims 1 to 4, characterized in that: The photoelectric conversion module includes an output optical waveguide, which has a light entrance surface and a light exit surface. The light entrance surface faces the light source, and the light exit surface is used to emit the filtered light signal. The filtering module covers the light entrance surface and / or the light exit surface, and the output optical waveguide has the filtering spectrum.

6. The photoelectric conversion module according to any one of claims 1 to 5, characterized in that: The photoelectric conversion module further includes a lens group, the filter module covers a surface of at least one lens included in the lens group, and the lens covered by the filter module has the filter spectrum.

7. The photoelectric conversion module according to any one of claims 1 to 6, characterized in that: The photoelectric conversion module also includes an optical isolator, which includes a first port and a second port. The first port faces the light source, and the second port is used to emit the filtered optical signal. The filtering module covers the first port and / or the second port, and the optical isolator has the filtering spectrum.

8. The photoelectric conversion module according to any one of claims 1 to 7, characterized in that: The filtering module includes a first submodule and a second submodule, the first submodule has a first sub-filtering spectrum, and the second submodule has a second sub-filtering spectrum; The first sub-filter spectrum and the second sub-filter spectrum are spliced ​​to form the filter spectrum, or the intersection of the first sub-filter spectrum and the second sub-filter spectrum is the filter spectrum.

9. The photoelectric conversion module according to any one of claims 1 to 8, characterized in that: The filter spectrum includes a passband frequency range and at least one stopband frequency range, the first frequency is located in the passband frequency range, and the second frequency is located in the stopband frequency range.

10. A light source, characterized in that: It comprises a housing, a laser and a filter module, wherein the laser and the filter module are encapsulated inside the housing; The laser is used to receive a modulated electrical signal, and to send a modulated optical signal to the filtering module according to the modulated electrical signal, wherein the frequency of the modulated optical signal includes a first frequency and a second frequency, wherein the first frequency corresponds to a bit value of 1 in the modulated electrical signal, and the second frequency corresponds to a bit value of 0 in the modulated electrical signal; The filtering module is used to filter the modulated light signal based on a filtering spectrum to output a filtered light signal, wherein the modulated light signal having the first frequency corresponds to a first transmittance in the filtering spectrum, and the modulated light signal having the second frequency corresponds to a second transmittance in the filtering spectrum, and the first transmittance is greater than the second transmittance.

11. The light source according to claim 10, characterized in that The housing has a light outlet, the filtered light signal is emitted from the light source via the light outlet, and the filter module is included between the laser and the light outlet.

12. The light source according to claim 10 or 11, characterized in that: The housing has a light outlet, the filter module covers the light outlet, and the light outlet has the filter spectrum.

13. The light source according to any one of claims 10 to 12, characterized in that: The light source further includes a lens group, the filter module covers a surface of at least one lens included in the lens group, and the lens covered by the filter module has the filter spectrum.

14. The light source according to any one of claims 10 to 13, characterized in that The light source also includes an optical isolator, which includes a first port and a second port. The first port faces the laser, and the second port is used to emit the filtered optical signal. The filtering module covers the first port and / or the second port, and the optical isolator has the filtering spectrum.

15. An optical communication device, characterized in that: The optical communication device comprises a processor and a photoelectric conversion module, wherein the photoelectric conversion module is as described in any one of claims 1 to 9; the photoelectric conversion module further comprises a photoelectric detector and an amplifier, the processor is connected to the driving module, and the processor, the amplifier and the photoelectric detector are connected in sequence, The processor is used to send a first service electrical signal to the driving module, and the driving module is used to send the modulated electrical signal to the light source according to the first service electrical signal; The photoelectric detector is used to receive a service optical signal, convert the service optical signal into a second service electrical signal, and send the second service electrical signal to the amplifier; The amplifier is used to amplify the power of the second service electrical signal to obtain an amplified second service electrical signal, and send the amplified second service electrical signal to the processor.

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