Light source, measuring device and optical communication equipment

Abstract

The invention discloses a light source, a measuring device and optical communication equipment, which can reduce the number of optical devices included in the measuring device, reduce the volume of the measuring device and further improve the integration level of the measuring device. The light source comprises a laser and a filtering module, the filtering module comprises a first filtering piece and a second filtering piece, and an optical resonant cavity structure is formed between the first filtering piece and the second filtering piece through non-airtight packaging. The laser is used for sending a first optical signal to the filtering module; the filtering module is used for filtering the first optical signal based on the optical resonant cavity structure to obtain a filtered optical signal, the filtered optical signal corresponds to a first spectrum, the first spectrum is of a comb-shaped spectrum structure, the filtered optical signal is used for measuring a second spectrum, and the second spectrum is of a comb-shaped spectrum structure. The second spectrum is a spectrum corresponding to a second optical signal emitted by the light source to be measured.

Description

Technical Field

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

[0002] With the continuous development of optical fiber communication technology, it has been widely used in military, national defense, aerospace, industrial and mining enterprises, energy and environmental protection, industrial control, medicine and health, measurement and testing, construction, household appliances and other fields. The wavelength that carries information transmission needs to be measured.

[0003] Figure 1 The structure of the existing measuring device 100 is shown in FIG. The measuring device 100 includes a light source 101, an etalon 102, an optical switch 104, a detector 105, and a processor 106. The light source 101 is used to send a first optical signal to the etalon 102, and the etalon 102 filters the first optical signal to send the filtered first optical signal to the optical switch. The light source 103 to be measured sends a second optical signal to the optical switch, and the optical switch 104 is used to send the filtered first optical signal and the second optical signal to the detection module 105 in a time-sharing manner. The detection module 105 is used to perform photoelectric conversion on the filtered first optical signal and the second optical signal to output electrical signals, and the processor 106 is used to measure the spectrum of the second optical signal emitted by the light source 103 to be measured according to the electrical signal.

[0004] The etalon 102 adopts a fully hermetically sealed structure, which results in a complex manufacturing process and high cost for the etalon 102. Moreover, the measuring device 100 requires more optical devices to measure the spectrum of the second optical signal emitted by the light source to be measured, which increases the volume of the measuring device 100 and reduces the integration of the measuring device 100. Summary of the invention

[0005] The embodiments of the present application provide a light source, a measuring device, and an optical communication device, which can reduce the number of optical devices included in the measuring device, reduce the volume of the measuring device, and thus improve the integration of the measuring device.

[0006] In a first aspect, an embodiment of the present application provides a light source, comprising a laser and a filtering module, wherein the filtering module comprises a first filtering element and a second filtering element, and an optical resonant cavity structure is formed between the first filtering element and the second filtering element through a non-airtight package; the laser is used to send a first light signal to the filtering module; the filtering module is based on the optical resonant cavity structure, and is used to filter the first light signal to obtain a filtered light signal, wherein the filtered light signal corresponds to a first spectrum, the first spectrum has a comb-like spectrum structure, and the filtered light signal is used to measure a second spectrum, which is a spectrum corresponding to the second light signal emitted by the light source to be measured.

[0007] As shown in the first aspect, the light source is applied to a measuring device, and the measuring device uses the filtered light signal emitted by the light source to directly measure the spectrum corresponding to the second light signal emitted by the light source to be measured without filtering. Because the measuring device does not need to be provided with an optical device for filtering, the number of optical devices included in the measuring device is effectively reduced, the volume of the measuring device is reduced, and the integration of the measuring device is improved. Moreover, because there is no need to form an airtight package between the first filter component and the second filter component, the complexity of the light source structure is effectively reduced.

[0008] Based on the first aspect, in an optional implementation, the filtering module also includes a third filter element, and the third filter element is used to filter the first optical signal based on a first filtering spectrum. The wavelength of the first optical signal includes a first wavelength, and the first wavelength corresponds to a first transmittance in the first filtering spectrum. The first transmittance is used to identify the first spectrum.

[0009] With this implementation, when the third filter element filters the first optical signal based on the first filter spectrum, the first spectrum can be accurately identified, thereby improving the accuracy and efficiency of measuring the spectrum corresponding to the second optical signal emitted by the light source to be measured.

[0010] Based on the first aspect, in an optional implementation, the optical resonant cavity structure is used to filter the first optical signal based on a second filtering spectrum, the wavelength of the first optical signal includes N second wavelengths, each of the N second wavelengths corresponds to a second transmittance in the second filtering spectrum, and N is an arbitrary integer greater than 1; the first wavelength is different from each of the second wavelengths, and the first transmittance is different from each of the second transmittances.

[0011] With this implementation, since the first transmittance is different from each of the second transmittances, the accuracy of the third filter element in marking the first spectrum is effectively improved.

[0012] Based on the first aspect, in an optional implementation manner, the first transmittance is smaller than each of the second transmittances, or the first transmittance is larger than each of the second transmittances.

[0013] By adopting this implementation method, the accuracy of the third filter element in identifying the first spectrum is effectively improved.

[0014] Based on the first aspect, in an optional implementation, the light source includes an isolator, and at least one of the first filter element and the second filter element covers a first port of the isolator, and the first port is located on a transmission optical path of the first optical signal emitted from the laser.

[0015] With this implementation, since the filter module is multiplexed to the isolator, it is ensured that the first spectrum corresponding to the optical signal after filtering presents a comb-shaped spectrum structure, thereby reducing the number of optical devices included in the light source and improving the integration of the light source.

[0016] Based on the first aspect, in an optional implementation, the light source includes an isolator, the third filter component covers a second port of the isolator, and the second port is located on a transmission optical path of the first optical signal emitted from the laser.

[0017] With this implementation, since the third filter element is multiplexed into the isolator, it is ensured that the first spectrum corresponding to the filtered optical signal has an identification optical power for identifying the first spectrum, thereby improving the accuracy of measuring the spectrum corresponding to the second optical signal emitted by the light source to be measured.

[0018] Based on the first aspect, in an optional implementation, the light source includes a lens group, the lens group includes at least one lens, and one of the first filter, the second filter and the third filter covers the surface of the lens, and the surface of the lens is located on the transmission optical path of the first light signal emitted from the laser.

[0019] With this implementation, since the filter module is multiplexed into the lens group, it is ensured that the first spectrum corresponding to the optical signal after filtering presents a comb-shaped spectrum structure, thereby reducing the number of optical devices included in the light source and improving the integration of the light source.

[0020] Based on the first aspect, in an optional implementation, the light source includes an output optical waveguide, and one of the first filter element, the second filter element and the third filter element covers a target surface of the output optical waveguide, the target surface is a light incident surface or a light exiting surface of the output optical waveguide, and the target surface is located on a transmission optical path of the first optical signal emitted from the laser.

[0021] With this implementation, since the filter module is multiplexed to the output optical waveguide, it is ensured that the first spectrum corresponding to the optical signal after filtering presents a comb-shaped spectrum structure, thereby reducing the number of optical devices included in the light source and improving the integration of the light source.

[0022] Based on the first aspect, in an optional implementation manner, one of the first filter element, the second filter element and the third filter element covers the light outlet of the laser.

[0023] With this implementation, since the filter module is multiplexed to the laser, it is ensured that the first spectrum corresponding to the optical signal after filtering presents a comb-shaped spectrum structure, thereby reducing the number of optical devices included in the light source and improving the integration of the light source.

[0024] Based on the first aspect, in an optional implementation, the filtering module also includes a first light-transmitting plate, the first light-transmitting plate includes a first side surface and a second side surface positioned opposite to each other, the first side surface and the second side surface are located on a transmission optical path of the first optical signal emitted from the laser, the first filtering component covers the first side surface, and the third filtering component covers the second side surface.

[0025] By adopting this implementation, the first light signal can be filtered and the first spectrum can be successfully identified through the first light-transmitting plate that has covered the first filter element and the third filter element.

[0026] Based on the first aspect, in an optional implementation, the filtering module also includes a second light-transmitting plate, the second light-transmitting plate includes a third side surface, the third side surface is located on the transmission optical path of the first optical signal emitted from the laser, and the second filtering element covers the third side surface.

[0027] By adopting this implementation, the first light signal can be filtered and the first spectrum can be successfully identified through the first light-transmitting plate that has covered the first filter element and the third filter element, and through the second light-transmitting plate that has covered the second filter element.

[0028] In the second aspect, an embodiment of the present application provides a measuring device, comprising a detection module, a processor, and a light source as described in any one of the first aspects above; wherein the light source, the detection module, and the processor are connected in sequence. The light source is used to send the filtered light signal to the detection module; the detection module is used to perform photoelectric conversion on the filtered light signal to obtain a first detection electrical signal, and send the first detection electrical signal to the processor; the detection module is also used to receive the second light signal from the light source to be measured, and perform photoelectric conversion on the second light signal to obtain a second detection electrical signal, and send the second detection electrical signal to the processor; the processor is used to measure the second spectrum according to the first detection electrical signal and the second detection electrical signal. For a description of the beneficial effects of this aspect, please refer to the first aspect, and no further details will be given.

[0029] Based on the second aspect, in an optional implementation, the measuring device also includes an optical switch, the input port of the optical switch is respectively connected to the light source and the light source to be measured, the output end of the optical switch is connected to the detection module, and the optical switch is used to send the filtered optical signal and the second optical signal to the detection module in a time-sharing manner.

[0030] Based on the second aspect, in an optional implementation, the detection module includes a first detector and a second detector, the first detector is connected to the light source, and the second detector is connected to the light source to be measured, the first detector is used to receive the filtered light signal and send the first detection electrical signal to the processor; the second detector is used to receive the second light signal and send the second detection electrical signal to the processor.

[0031] In a third aspect, an embodiment of the present application provides an optical communication device, the optical communication device comprising a processor, a light source to be measured, a spectrometer, a light source and a detection module, the light source being as described in any one of the first aspects above; wherein the light source to be measured, the spectrometer, the detection module and the processor are connected in sequence, the light source is connected to the detection module, and the processor is also connected to the light source to be measured. The processor is used to send a service electrical signal to the light source to be measured; the light source to be measured is used to convert the service electrical signal into a service optical signal, and send the service optical signal to the spectrometer; the spectrometer is used to split the service optical signal to obtain the second optical signal and the third optical signal, send the second optical signal to the detection module, and emit the third optical signal; the light source is used to send the filtered optical signal to the detection module; the detection module is used to perform photoelectric conversion on the filtered optical signal to obtain a first detection electrical signal, and send the first detection electrical signal to the processor; the detection module is also used to perform photoelectric conversion on the second optical signal to obtain a second detection electrical signal, and send the second detection electrical signal to the processor; the processor is used to measure the second spectrum according to the first detection electrical signal and the second detection electrical signal.

[0032] In a fourth aspect, an embodiment of the present application provides an optical communication system, the optical communication system comprising a plurality of optical communication devices, each of the optical communication devices being as shown in the third aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The figure is a structural example of an existing measuring device;

[0034] Figure 2 This is a diagram showing a first embodiment of the structure of the measuring device provided in the present application;

[0035] Figure 3 This is a diagram showing an example structure of the first embodiment of the light source provided in this application;

[0036] Figure 4 The spectrum of the light signal output by the light source provided in the application;

[0037] Figure 5 This is a diagram showing a second embodiment of the structure of the light source provided in this application;

[0038] Figure 6 This is a structural example diagram of a third embodiment of the light source provided in this application;

[0039] Figure 7 This is a structural example diagram of a fourth embodiment of the light source provided in this application;

[0040] Figure 8 This is a structural example diagram of a fifth embodiment of the light source provided in this application;

[0041] Fig. 9 An example diagram of the first filter spectrum provided in this application;

[0042] Fig.10 An example diagram of the second filter spectrum provided in this application;

[0043] Fig.11 This is an example diagram of the structure of the first spectrum provided in this application;

[0044] Fig.12 This is a diagram showing a sixth structural example of a light source provided in this application;

[0045] Fig.13 A diagram showing a second embodiment of the measuring device provided in the present application;

[0046] Fig.14 An example diagram of the structure of an embodiment of the optical communication device provided in this application;

[0047] Fig.15 This is a diagram showing an example of the structure of the optical communication system provided in this application. DETAILED DESCRIPTION

[0048] 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.

[0049] The embodiment of the present application provides a light source, which is applied to a measuring device. The measuring device uses the light signal emitted by the light source to directly measure the spectrum corresponding to the light signal emitted by the light source to be measured without filtering. Because the measuring device does not need to be provided with an optical device for filtering, the number of optical devices included in the measuring device is effectively reduced, the volume of the measuring device is reduced, and the integration of the measuring device is improved. Figure 2The first embodiment of the measuring device provided in the present application is a structural example diagram. The measuring device 200 shown in this embodiment includes a light source 201, an optical switch 202, a detection module 204 and a processor 203. In this embodiment, the light source 201 is taken as a part of the measuring device as an example. In other examples, the light source 201 can also be externally connected to the measuring device, that is, the measuring device is configured with a detection light interface, and the detection light interface is used to connect the light source 201, which is not limited in this embodiment. One input port of the optical switch 202 is connected to the light source 201, and the other input port is connected to the light source 210 to be measured. The output port of the optical switch 202 is connected to the detection module 204, and the detection module 204 is connected to the processor 203. The detection module 204 shown in this embodiment can be a photoelectric detector (photoelectric detector, PD), a photodiode (positive intrinsic-negative, PIN) or an avalanche diode (avalanche photo diode, APD), etc., which is not limited in this embodiment. This embodiment is exemplarily described by taking the detection module 204 as PD as an example. This embodiment does not limit the type of the processor 203. For example, the processor 203 may be one or more chips, or one or more integrated circuits. For another example, the processor 203 may 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.

[0050] The light source 201 directly sends a filtered light signal to the optical switch 202, and the spectrum of the filtered light signal presents a comb-shaped spectrum structure. The optical switch 202 also receives a second light signal from the light source to be measured 210, and the measuring device 200 is used to measure the second spectrum corresponding to the second light signal. To this end, the optical switch 202 sends the filtered light signal and the second light signal to the detection module 204 in a time-sharing manner. The detection module 204 is used to perform photoelectric conversion on the filtered light signal to obtain a first detection electrical signal, and send the first detection electrical signal to the processor 203. The detection module 204 is also used to perform photoelectric conversion on the second light signal to obtain a second detection electrical signal, and send the second detection electrical signal to the processor 203. The processor 203 is used to measure the second spectrum according to the first detection electrical signal and the second detection electrical signal. Based on the measured second spectrum, the monitoring or calibration of each wavelength included in the second light signal emitted by the light source to be measured 210 is realized, and the specific application is not limited in this embodiment. It can be understood that the measuring device 200 shown in this embodiment can be applied to a spectrum measuring instrument, a colorimeter, a spectrometer, a spectrum analyzer, etc.

[0051] In order to achieve measurement of the second spectrum corresponding to the second light signal emitted by the light source 210 to be measured, the light source 201 shown in this embodiment can directly emit a filtered light signal, and the first spectrum corresponding to the filtered light signal presents a comb-shaped spectrum structure, so that the measuring device does not need to filter the filtered light signal emitted by the light source 201. Therefore, the measuring device does not need to be configured with an optical device specifically used to filter the light signal emitted by the light source 201, thereby reducing the volume of the measuring device and improving the integration of the measuring device.

[0052] The structure of the light source that directly outputs the filtered optical signal is described below. Figure 3The first embodiment of the light source provided in the present application is a structural example diagram. The light source 300 shown in this embodiment includes a substrate 311, and the substrate 311 is used to encapsulate the various components included in the light source 300. The number of substrates 311 is not limited in this embodiment. Among them, the substrate 311 can be a printed circuit board (PCB) or a switch substrate. The substrate 311 is used to encapsulate the laser 301 and multiple coupling components. The substrate 311 includes one or more layers of plate materials, and each plate material has a single-sided or double-sided conductive trace. The type of plate material is not limited in this embodiment. For example, the plate material 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 311, the connection between the device single board and the laser 301 is realized, so that the device single board can send an electrical signal to the laser 301 through the substrate 311, and the laser 301 emits a first optical signal under the drive of the electrical signal. This embodiment does not limit the specific type of the laser 301. For example, the laser 301 may be a direct modulation laser (DML), an electro-absorption modulated laser (EML), or a vertical cavity surface emitting laser (VCSEL). This embodiment takes the first optical signal emitted by the laser 301 as an example of a broadband optical signal. This embodiment does not limit the specific wavelength range of the first optical signal. The broadband optical signal may cover multiple wavelength channels of the C-band and / or L-band. Multiple coupling components are used to couple the first optical signal emitted by the laser 301 to the output optical waveguide 302 of the light source 300. Figure 2 In the measurement device 200 shown, the output optical waveguide 302 of the light source is connected to the optical switch 202, so that the first optical signal emitted by the laser 301 can be sent to the optical switch 202 via the output optical waveguide 302. The multiple coupling components coupling the first optical signal to the output optical waveguide 302 refers to the process that the multiple coupling components collimate, shape, isolate and converge the first optical signal emitted by the laser 301 to the output optical waveguide 302. This embodiment does not limit the number and type of coupling components included in the light source 300. For example, the multiple coupling components included in the light source 300 are the first lens group 303, the isolator 304 and the second lens group 305 in sequence.

[0053] The first lens group 303 is used to collimate the first optical signal from the laser 301 to obtain the collimated first optical signal. The first lens group 303 may include one or more lenses. The specific type of the lens is not limited in this embodiment. For example, the lens may be a spherical lens or an aspherical lens. The first lens group 303 sends the collimated first optical signal to the isolator 304. The isolator 304 can successfully pass the collimated first optical signal and send it to the second lens group 305 to avoid the reflected light outside the light source 300 passing through the isolator 304 to cause interference to the laser 301, thereby effectively ensuring the working performance of the laser 301. The second lens group 305 is used to converge the first optical signal to the output optical waveguide 302. For the description of the second lens group 305, please refer to the description of the first lens group 303, and the details are not repeated. The light source 300 also includes a radiator 306. The radiator 306 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 306 is used to control the central wavelength of the optical signal emitted by the laser 301 to be in a stable state, suppress the drift degree of the wavelength emitted by the laser 301, and thus ensure the stability of the peak optical power of each central wavelength output by the laser 301, and avoid the peak optical power output by the laser 301 from drifting. Optionally, the light source 300 shown in this embodiment also includes a temperature detection element 307, which is packaged on the surface of the heat sink 306 and is used to detect the temperature of the laser 301. For example, if the temperature of the laser 301 changes, the electrical performance of the temperature detection element 307, such as voltage, current or resistance, changes. The device board senses that the electrical performance of the temperature detection element 307 has changed, and will control the temperature of the heat sink 306 to keep the temperature of the laser 301 within a constant temperature range to ensure the stability of each central wavelength emitted by the laser 301. This embodiment does not limit the type of the temperature detection element 307. For example, the temperature detection element 307 can be a thermistor.

[0054] The first spectrum corresponding to the optical signal output by the light source shown in this embodiment through the output optical waveguide 302 presents a comb-shaped spectrum structure. Figure 4 Spectrum diagram of the light signal output by the light source provided in the application. Figure 4It can be seen from the spectrum diagram shown that the optical signal output by the light source shown in this embodiment has N wavelength channels. Different wavelength channels have different central wavelengths. For example, the central wavelengths of the N wavelength channels are λ1, λ2 to λn respectively. The central wavelengths in the first spectrum shown in this embodiment are in a stable state, that is, the central wavelengths do not change with time or temperature, or the degree of change is very small. In order to make the first spectrum present a comb-like spectrum structure, the light source shown in this embodiment includes a filtering module, which can filter the first optical signal emitted by the laser 301 and output the filtered optical signal, and the spectrum of the filtered optical signal presents a comb-like spectrum structure. The following describes several optional structures of the filtering module:

[0055] Optional structure 1

[0056] Continue to see Figure 3As shown, the filtering module shown in this example includes a first filter element 331 and a second filter element 332. The isolator 304 includes a first port and a second port, the first port can be one of the incident port and the exit port, and the second port is the other of the incident port and the exit port. The incident port of the isolator 304 faces the laser 301, and the exit port of the isolator 304 faces the second lens group 305. It can be understood that the collimated first optical signal emitted from the first lens group 303 is incident from the incident port of the isolator 304 to the isolator 304, and after passing through the isolator 304, it is emitted from the exit port of the isolator 304. Take the first filter element 331 and the second filter element 332 shown in this embodiment as an example that both cover the first port of the isolator 304. For example, the first filter element 331 and the second filter element 332 both cover the incident port of the isolator 304, then the second filter element 332 is located between the first filter element 331 and the incident port of the isolator 304. For another example, both the first filter element 331 and the second filter element 332 cover the exit port of the isolator 304. Then, the first filter element 331 is located between the exit port of the isolator 304 and the second filter element 332. The first filter element 331 and the second filter element 332 shown in this embodiment are located on the transmission optical path of the first optical signal emitted from the laser 301. An optical resonant cavity structure of a Fabry-Perot (FP) standard is formed between the first filter element 331 and the second filter element 332. Based on the FP principle, the first optical signal incident on the optical resonant cavity is reflected multiple times inside the optical resonant cavity and is finally divided into multiple optical signals with different central wavelengths. Then, the corresponding spectra of the multiple optical signals with different central wavelengths emitted from the optical resonant cavity present a comb-like spectral structure. Since both the first filter element 331 and the second filter element 332 cover the incident port of the isolator 304, an optical resonant cavity structure can be formed when a non-airtight package is formed between the first filter element 331 and the second filter element 332. Since there is no need to form an airtight package between the first filter element 331 and the second filter element 332, the complexity of the filter module structure is effectively reduced, and since the filter module is reused in the isolator 304, it is ensured that the first spectrum corresponding to the filtered optical signal is a comb-shaped spectrum structure, the number of optical devices included in the light source is reduced, and the integration of the light source is improved. The thickness of the first filter element 331, the thickness of the second filter element 332, the refractive index of the first filter element 331, the refractive index of the second filter element 332, and the distance between the first filter element 331 and the second filter element 332 shown in this embodiment determine the spectrum of the filtered optical signal output from the filter module. Taking the first filter element 331 as an example, the first filter element 331 can be an optical filter, and the optical filter is coated to the incident port of the isolator 304.The optical filter may be composed of one or more layers of thin films, and the spectrum of the filtered optical signal output by the isolator may be adjusted by adjusting the thickness and refractive index of different thin films. For the description of the second filter element 332, please refer to the description of the first filter element 331, and no further details are given. It should be clear that in order to ensure that the light source can successfully output the filtered optical signal, the isolator 304 is not located in the optical resonant cavity structure formed between the first filter element 331 and the second filter element 332.

[0057] It can be understood that in this example, when the isolator 304 reuses the first filter element 331 and the second filter element 332, the isolator 304 has the function of both the FP etalon and the isolator. Then, based on the structure of the optical resonant cavity, the isolator 304 can filter the first optical signal from the first lens group 303 to output a filtered optical signal, and the filtered optical signal is sent to the second lens group 305 through the isolator 304.

[0058] Optional structure 2

[0059] Figure 5 This is a diagram showing an example structure of the second embodiment of the light source provided in this application. Figure 5 For a description of the laser 301 and the structure of each coupling component, see Figure 3 The corresponding description is not described in detail. The filtering module shown in this example includes a first filter element 401 and a second filter element 402. The output optical waveguide 302 has a light incident surface and a light exit surface. The light incident surface of the output optical waveguide 302 is used to receive the first light signal from the second lens group 305, and the light exit surface of the output optical waveguide 302 is used to emit the filtered light signal. The first filter element 401 shown in this example covers the light incident surface of the output optical waveguide 302. The second filter element 402 covers the light exit surface of the output optical waveguide 302. Then, the first filter element 401 and the second filter element 402 are both located on the transmission optical path of the first light signal emitted from the second lens group 305. An optical resonant cavity structure of an FP standard is formed between the first filter element 401 and the second filter element 402. For the description of the optical resonant cavity structure, please refer to the above-mentioned optional structure 1, and the specific details are not described.

[0060] It can be understood that in this example, when the output optical waveguide 302 multiplexes the first filter element 401 and the second filter element 402, the output optical waveguide 302 has the function of both the FP etalon and the output optical waveguide. Then, based on the structure of the optical resonant cavity, the output optical waveguide 302 can filter the first optical signal from the second lens group 305 to output a filtered optical signal, and the filtered optical signal is transmitted to the output optical waveguide 302 through the output optical waveguide 302. Figure 2 The optical switch shown.

[0061] Optional structure 3

[0062] Figure 6 This is a structural example diagram of the third embodiment of the light source provided in this application. Figure 6 For a description of the laser 301 and the structure of each coupling component, see Figure 3 The corresponding description is not described in detail. The filtering module shown in this example includes a first filter element 601 and a second filter element 602. The filtering module shown in this embodiment is multiplexed to the first lens group 303 as an example. In this example, the first lens group 303 includes a lens as an example. The lens has a light incident surface and a light exit surface. The light incident surface of the lens faces the laser 301, and the light exit surface of the lens faces the isolator 304. The light incident surface of the lens is used to receive the first light signal from the laser 301, and the light exit surface of the lens is used to emit the filtered light signal. The first filter element 601 shown in this example covers the light incident surface of the lens. The second filter element 602 covers the light exit surface of the lens. Then, the first filter element 601 and the second filter element 602 are both located on the transmission optical path of the first light signal emitted from the laser 301. The optical resonant cavity structure of the FP standard is formed between the first filter element 601 and the second filter element 602. For the description of the optical resonant cavity structure, please refer to the optional structure 1 above, and the specific description is not repeated. It should be noted that this example takes the reuse of the filter module on one lens in the first lens group 303 as an example. In other examples, the filter module can also be reused on two different lenses included in the first lens group 303, and there is no specific limitation. The filter module shown in this example can also be reused on the second lens group 305. For specific instructions, please refer to the description of the reuse of the filter module on the first lens group 303, and no further details will be given.

[0063] It can be understood that in this example, when the first filter 601 and the second filter 602 are reused in the first lens group 303, the first lens group 303 has the function of the FP standard tool and the function of collimation. Then, based on the structure of the optical resonant cavity, the first lens group 303 can filter the first optical signal from the laser 301 to output the filtered optical signal. It should be clear that in order to ensure that the light source can successfully output the filtered optical signal, the isolator 304 is not located in the optical resonant cavity structure formed between the first filter 331 and the second filter 332. Therefore, the first filter 601 and the second filter 602 can be reused in the first lens group 303, or the first filter 601 and the second filter 602 can be reused in the second lens group 305 to ensure that the isolator 304 is not located inside the optical resonant cavity structure.

[0064] Optional structure 4

[0065] In the optional structures 1 to 3 of the filtering module, the first filter element and the second filter element included in the filtering module are multiplexed on only one coupling component as an example (that is, the optional structure 1 is only multiplexed on the isolator, the optional structure 2 is only multiplexed on the output optical waveguide, and the optional structure 3 is only multiplexed on the first lens group). In the optional structure 4, the first filter element and the second filter element included in the filtering module can be multiplexed on multiple different coupling components. Figure 7 This is a structural example diagram of the fourth embodiment of the light source provided in this application. Figure 7 For a description of the laser 301 and the structure of each coupling component, see Figure 3 The corresponding description is not repeated in detail. The filtering module shown in this example includes a first filter element 701 and a second filter element 702. The first filter element 701 and the second filter element 702 are multiplexed on two different coupling components. Figure 7 The example shown is that the first filter element 701 covers the exit port of the isolator 304. The example shown in this example is that the second filter element 702 covers the light incident surface of the output optical waveguide 302. Without limitation, in other examples, the second filter element 702 may also cover the light exit surface of the output optical waveguide 302. An optical resonant cavity structure is formed between the first filter element 601 and the second filter element 602. For the description of the optical resonant cavity structure, please refer to the optional structure 1 above, and the details are not repeated here. It can be understood that when the second filter element 702 is multiplexed to the output optical waveguide 302, in order to ensure that the isolator 304 is not located in the optical resonant cavity structure, the first filter element 701 covers the exit port of the isolator 304.

[0066] It can be understood that in this example, when the isolator 304 reuses the first filter element 701, and the output optical waveguide 302 reuses the second filter element 702, the isolator 304 and the output optical waveguide 302 simultaneously have the functions of the FP etalon, and respectively have the functions of the isolator 304 and the output optical waveguide 302. Then, based on the structure of the optical resonant cavity, the isolator 304 and the output optical waveguide 302 can filter the first optical signal from the first lens group 303 to output the filtered optical signal, and the filtered optical signal is sent to the optical switch through the output optical waveguide 302.

[0067] This example does not limit the coupling component reused by the first filter and the coupling component reused by the second filter, as long as the optical signal emitted by the laser is successfully filtered and the isolator 304 is not located in the optical resonant cavity structure. For example, the first filter is reused on the first lens group 303, and the second filter can be reused on the incident port of the isolator 304. For another example, the first filter is reused on the exit port of the isolator 304, and the second filter is reused on the second lens group 305 or the output optical waveguide 302. For another example, the first filter is reused on the second lens group 305, and the second filter is reused on the output optical waveguide, etc., and there is no specific limitation.

[0068] Optional structure 5

[0069] In the above-mentioned optional structures 1 to optional structures 4, taking the example that the first filter element and the second filter element included in the filter module are both multiplexed to the coupling component, in optional structure 5, among the first filter element and the second filter element, only the second filter element is multiplexed to the coupling component, and the first filter element is multiplexed to the laser 301. Figure 8 This is a structural example diagram of the fifth embodiment of the light source provided in this application. Figure 8 For a description of the laser 301 and the structure of each coupling component, see Figure 3 The corresponding description is not described in detail. The filtering module shown in this example includes a first filter element 801 and a second filter element 802. The first filter element 801 covers the light outlet of the laser 301. The light outlet of the laser 301 is used to emit a first optical signal, so that the first optical signal emitted through the light outlet is sent to the first lens group 303. The isolator 304 has an incident port and an exit port. For the description of the incident port and the exit port of the isolator 304, please refer to the description of the optional structure 1, and the details are not repeated. This example shows that the second filter element 802 covers the incident port of the isolator 304 as an example to ensure that the isolator 304 is not located in the optical resonant cavity structure. In other examples, the second filter element 802 can also be reused in the first lens group 303, and there is no specific limitation.

[0070] It can be understood that in this example, when the laser 301 reuses the first filter element 801, and the isolator 304 reuses the second filter element 802, the laser 301 and the isolator 304 simultaneously have the functions of the FP etalon, and have the functions of the laser 301 and the isolator 304. Then, based on the structure of the optical resonant cavity, the laser 301 and the isolator 304 can filter the first optical signal to output a filtered optical signal, and the filtered optical signal is emitted through the output optical waveguide 302.

[0071] In the above embodiment, the light source filters the first light signal emitted by the laser into a filtered light signal through a filtering module, and the first spectrum corresponding to the filtered light signal presents a comb-shaped spectrum structure. The light source shown in this embodiment also includes a third filter element, which is used to identify the first spectrum. Fig. 9 and Fig.10 As shown, Fig. 9 This is an example diagram of the first filter spectrum provided in this application. Fig.10 This is an example diagram of the second filter spectrum provided by this application. Among them, the filter module is based on Fig.10 The second filter spectrum shown is filtered to obtain the first spectrum, and the third filter is based on Fig. 9 The second filter shown is filtered to obtain the identification optical power included in the first spectrum, and the identification optical power is used to identify the first spectrum. When the filtering module filters the first optical signal based on the first filter spectrum and the second filter spectrum, a filtered optical signal can be obtained. Fig.10 The horizontal axis of the second filter spectrum shown is the wavelength, which can be in nanometers (nm), and the vertical axis is the transmittance. That is, Fig.10 The second filter spectrum shown illustrates the variation of the second transmittance with the second wavelength of the first optical signal. For example, if the second wavelength of the first optical signal is the central wavelength λ1 (referring to the position of the peak in a wavelength channel), then the central wavelength λ1 is Fig.10 The second transmittance corresponding to the second filter spectrum shown is K2. The second transmittance K2 shown in this example can be 1 or close to 1, so that the filtering module is based on Fig.10 The second filter spectrum shown filters the central wavelength λ1, so that the central wavelength λ1 can be emitted from the filter module losslessly or nearly losslessly. If the second wavelength of the first optical signal is the boundary wavelength λn1 (referring to the position of the trough in a wavelength channel), then the boundary wavelength λn1 is Fig.10 The second transmittance corresponding to the second filter spectrum shown is K3, and K3 shown in this example is less than K1. Then, the filter module is based on Fig.10 The second filtering spectrum shown filters the first optical signal to obtain a comb-like spectral structure (ie, including multiple wavelength channels). Fig. 9 For an explanation of the coordinate system of the first filter spectrum shown, see Fig.10 As shown, the details are not repeated here. Fig. 9 The first filter spectrum shown illustrates the corresponding relationship between the first transmittance and the first wavelength of the first optical signal. The first transmittance corresponding to the first wavelength 901 is K1. Fig. 9 and Fig.10As shown, the first transmittance K1 corresponding to the first wavelength 901 is less than the second transmittance K3 corresponding to the boundary wavelength. For example, the second filter spectrum includes N second wavelengths and N second transmittances, each of the N second wavelengths corresponds to one of the N second transmittances, and N is any integer greater than 1. For example, Fig.10 The second transmittance corresponding to the second wavelength λ1 is K2, and the second transmittance corresponding to the second wavelength λn1 is K3. Fig. 9 The first wavelength 901 shown is different from Fig.10 Each second wavelength of the N second wavelengths shown. The first wavelength 901 corresponds to a first transmittance K1 in the first filter spectrum, and the first transmittance K1 is less than any second transmittance of the N second transmittances. That is, K1 is less than K2, and K1 is less than K3. This embodiment does not limit the size relationship between the first wavelength and the N second wavelengths. This embodiment takes the first wavelength being less than each second wavelength of the N second wavelengths as an example. In other examples, the first wavelength may also be greater than each second wavelength of the N second wavelengths. For example, the first wavelength may be greater than some of the second wavelengths of the N second wavelengths, etc.

[0072] The first filter, the second filter, and the third filter together filter the first optical signal to obtain a filtered optical signal. The structure of the first spectrum corresponding to the filtered optical signal can be found in Fig.11 As shown, Fig.11 This is an example diagram of the structure of the first spectrum provided in this application. Fig.11The horizontal axis is wavelength, and the vertical axis is optical power. For example, the transmittance corresponding to the center wavelength λ1 in the second filter spectrum is K2. If the optical power corresponding to the center wavelength λ1 before filtering is P1, the optical power corresponding to the center wavelength λ1 after filtering in the first spectrum is P2, where P2=P1*K2. The transmittance corresponding to the boundary wavelength λn1 in the second filter spectrum is K3. If the optical power corresponding to the boundary wavelength λn1 before filtering is P3, the optical power corresponding to the boundary wavelength λn1 after filtering in the first spectrum is P4, where P4=P3*K3. Since K3 is less than K2, it can be seen that P4 is less than P2. Similarly, if the optical power corresponding to the first wavelength 901 before filtering is P5, the optical power corresponding to the first wavelength 901 after filtering in the first spectrum is P6, where P6=P5*K1. Since K1 is less than K2, and K1 is less than K3, it can be seen that P6 is less than P2, and P6 is less than P4. It can be known that in the first spectrum, the identification optical power is less than the optical power corresponding to any second wavelength included in the first spectrum. It should be clarified that, in this embodiment, the first transmittance in the first filter spectrum is less than each of the second transmittances in the second filter spectrum is taken as an example. Then, the identification optical power is less than the optical power corresponding to any second wavelength included in the first spectrum. In other examples, the first transmittance in the first filter spectrum may also be greater than each second transmittance in the second filter spectrum. Then, the identification optical power is greater than the optical power corresponding to any second wavelength included in the first spectrum. Because the identification optical power shown in this embodiment is different from the optical power corresponding to any second wavelength included in the first spectrum, the identification optical power can serve the purpose of identifying the first spectrum. Specifically, in combination with Figure 2As shown, in order to achieve the purpose of measuring the second spectrum corresponding to the second optical signal emitted by the light source 210 to be measured, the processor 203 needs to pre-set the sampling starting time point, sampling period and number of sampling points. The detection module 204 performs photoelectric conversion on the first optical signal from the light source 201 to obtain a first detection electrical signal, which includes the change of voltage over time. When the processor 203 detects the identification voltage corresponding to the identification optical power in the first detection electrical signal, the starting time point of sampling can be determined according to the identification voltage, so that the processor 203 samples the first detection electrical signal at the starting time point of sampling, and samples according to the preset sampling period and number of sampling points to ensure that the processor 203 can sample the first spectrum shown above within one sampling period to obtain the sampling result, which includes the corresponding relationship between the voltage and time obtained by sampling, and the processor 203 then converts the corresponding relationship between the voltage and time into the corresponding relationship between the wavelength and time. The processor 203 maps the corresponding relationship between the voltage and time obtained by sampling to the second detection electrical signal to obtain the second spectrum. It should be noted that this embodiment takes the first spectrum being identified by one identification wavelength as an example, and in other embodiments, the first spectrum may be identified by two or more identification wavelengths, which is not specifically limited. Fig. 9 The first spectrum shown is identified by two first wavelengths, namely, first wavelength 901 and first wavelength 902, wherein first wavelength 901 is smaller than each of the N second wavelengths, and first wavelength 901 is used to identify the starting position of the first spectrum. First wavelength 902 is larger than each of the N second wavelengths, and first wavelength 902 is used to identify the ending position of the first spectrum.

[0073] On the basis of the above optional structure 1, the first filter and the second filter cover the incident port of the isolator 304, and the third filter can cover the light outlet of the laser 301, the surface of a lens of the first lens group 303, the exit port of the isolator 304, the surface of a lens of the second lens group 305, the light entrance surface of the output optical waveguide 302, or the light exit surface of the output optical waveguide 302. If on the basis of the above optional structure 2, the first filter and the second filter cover the light entrance surface of the output optical waveguide 302 or the light exit surface of the output optical waveguide 302, respectively, the third filter covers the light exit of the laser 301, the surface of a lens of the first lens group 303, the incident port of the isolator 304, the exit port of the isolator 304, or the surface of a lens of the second lens group 305. If, on the basis of the above optional structure 3, the first filter and the second filter are respectively covered on the surface of a lens of the first lens group 303, the third filter covers the light outlet of the laser 301, the incident port of the isolator 304, the exit port of the isolator 304, the surface of a lens of the second lens group 305, the light entrance surface of the output optical waveguide 302, or the light exit surface of the output optical waveguide 302. If, on the basis of the above optional structure 4, the first filter and the second filter are covered on the exit port of the isolator 304 and the light entrance surface of the output optical waveguide 302, the third filter covers the light outlet of the laser 301, the surface of a lens of the first lens group 303, the incident port of the isolator 304, the surface of a lens of the second lens group 305, or the light exit surface of the output optical waveguide 302. If, based on the above optional structure 5, the first filter and the second filter respectively cover the light outlet of the laser 301 and the incident port of the isolator 304, then the third filter covers the surface of one lens of the first lens group 303, the exit port of the isolator 304, the surface of one lens of the second lens group 305, the light entrance surface of the output optical waveguide 302 or the light exit surface of the output optical waveguide 302. It should be clear that the description of the position of the third filter is not limited in this embodiment, as long as the third filter is located on the transmission optical path of the first optical signal emitted from the laser.

[0074] The structures of the first filter element, the second filter element and the third filter element shown in this embodiment can also be seen in Fig.12 As shown, Fig.12 This is a structural example diagram of the sixth embodiment of the light source provided in this application. Fig.12 For a description of the laser 301 and the structure of each coupling component, see Figure 3The corresponding description is not repeated in detail. The light source shown in this embodiment also includes a first light-transmitting plate 801 and a second light-transmitting plate 802, and the first light-transmitting plate 801 is parallel to the second light-transmitting plate 802. The first light-transmitting plate 801 and the second light-transmitting plate 802 can be made of any transparent material, such as glass, etc., to ensure that the first light-transmitting plate 801 and the second light-transmitting plate 802 do not change the transmission optical path of the optical signal. The first light-transmitting plate 801 has a first side and a second side, for example, the first side can be the side facing the laser 301, and the second side is the side facing the isolator 304. For example, the first side can be the side facing the isolator 304, and the second side is the side facing the laser 301. In this embodiment, the first side of the first light-transmitting plate 801 is the side facing the laser 301, and the second side is the side facing the isolator 304. The second light-transmitting plate 802 has a third side and a fourth side, for example, the third side can be the side facing the laser 301, and the fourth side is the side facing the isolator 304. For another example, the third side surface may be the side surface facing the isolator 304, and the second side surface may be the side surface facing the laser 301. In this embodiment, the third side surface of the second light-transmitting plate 802 is taken as the side surface facing the laser 301, and the fourth side surface is taken as the side surface facing the isolator 304. The first side surface of the first light-transmitting plate 801 covers the first filter element 803, and the fourth side surface of the second light-transmitting plate 802 facing the output optical waveguide covers the second filter element 804. The first filter element 803 and the second filter element 804 form an optical resonant cavity structure through non-airtight packaging. The second side surface of the first light-transmitting plate 801 facing the second light-transmitting plate 802 covers the third filter element 805, and the third side surface of the second light-transmitting plate 802 facing the first light-transmitting plate 801 may also cover another third filter element 806.

[0075] The present application also provides a measuring device. The structure of the measuring device can be seen in Figure 2 The corresponding description will not be repeated in detail. The structure of the measuring device shown in this embodiment can also be seen in Fig.13 As shown, Fig.13 The second embodiment of the measuring device provided in the present application is shown in the structural example diagram. The measuring device 1300 shown in this embodiment includes a light source 1301, a first detector 1302 and a processor 1305 connected in sequence, and the measuring device 1300 also includes a second detector 1304 connected to the light source 1310 to be measured, and the second detector 1304 is also connected to the processor 1305. Fig.13 For a description of the first detector 1302, the second detector 1304, and the processor 1305, see Figure 2 The corresponding description is not repeated here. For the description of the structure of the light source 1301 shown in this embodiment, please refer to Figure 3 , Figure 5 , Figure 6 , Figure 7, Figure 8 as well as Fig.12 The corresponding instructions are not elaborated in detail.

[0076] The present application also provides an optical communication device. The structure of the optical communication device can be seen in Fig.14 As shown, Fig.14 An example diagram of the structure of an embodiment of the optical communication device provided in the present application. The optical communication device 1400 specifically includes a light source to be tested 1410, a spectrometer 1411, an optical switch 1402, a detection module 1404 and a processor 1403 connected in sequence. The optical communication device 1400 also includes a light source 1401 connected to the optical switch 1402, and the processor 1403 is also connected to the light source to be tested 1410. The processor 1403 is used to send a service electrical signal to the light source to be tested 1410. The light source to be tested 1410 is used to convert the service electrical signal into a service optical signal, and send the service optical signal to the spectrometer 1411. The spectrometer 1411 is used to split the service optical signal to obtain a second optical signal and a third optical signal, send the second optical signal to the detection module 1404, and emit the third optical signal. It can be seen that the third optical signal emitted by the optical communication device 1400 can be emitted from the optical communication device 1400. The light source 1401 is used to send the filtered optical signal to the detection module 1404. The optical switch 1402 transmits the second optical signal from the optical splitter 1411 and the filtered optical signal from the light source 1401 to the detection module 1404 in a time-sharing manner. In other examples, the optical communication device 1400 may not include an optical switch. For details, see Fig.13 As shown, the details are not repeated here. The detection module 1404 is used to perform photoelectric conversion on the filtered light signal to obtain a first detection electrical signal, and send the first detection electrical signal to the processor 1403; the detection module 1404 is also used to perform photoelectric conversion on the second light signal to obtain a second detection electrical signal, and send the second detection electrical signal to the processor 1403; the processor 1403 is used to measure the second spectrum according to the first detection electrical signal and the second detection electrical signal. For a description of the structure of the light source 1401 shown in this embodiment, please refer to Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 as well as Fig.12It can be understood that the optical communication device 1400 shown in this embodiment can measure the spectrum corresponding to the optical signal emitted by the light source 1410 to be measured, so as to measure or calibrate the wavelength emitted by the light source 1410 to be measured, and if the processor 1403 detects that the wavelength emitted by the light source 1410 to be measured is offset, the wavelength of the light source 1410 to be measured can be calibrated in time to ensure that the light source 1410 to be measured can emit an optical signal with a stable wavelength.

[0077] This embodiment does not limit the device type of the optical communication equipment. For example, the optical communication equipment may be optical transmission equipment, optical access equipment, routers, switches, wireless base stations, wireless remote access equipment, wireless baseband signal processing equipment, etc. It may also be a computing server (usually referred to as a server), a high performance computer (HPC), a storage server, a memory resource pool, etc.

[0078] The embodiment of the present application also provides an optical communication system, Fig.15 This is a diagram showing an example of the structure of the optical communication system provided in the present application. The optical communication system 1500 includes a core node (central point, CP) 1501 and multiple access nodes (access point, AP) 1502 connected to CP1501. CP1501 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 1500. For example, the optical communication system 1500 includes three AP1502 as an example. CP1501 includes an outer shell, a plug-in frame, a CP-side device board 1511 and a CP-side optoelectronic conversion module 1512. The CP-side device board 1511 sends a service electrical signal to the CP-side optoelectronic conversion module 1512. The outer shell of CP1501 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 1512. Optionally, the CP-side optoelectronic conversion module 1512 can also be integrated with the CP-side device board 1511. One or more CP-side device boards 1511 may be included inside the outer shell. CP1501 is connected to AP1502 through an external optical cable. AP1502 includes an outer shell, an AP-side optoelectronic conversion module, and an AP-side device board. For example, the AP-side optoelectronic conversion module can be directly plugged into the AP-side device board, or it can be integrated with the AP-side device board. This example takes the example of AP1502 including one AP-side optoelectronic conversion module. In other examples, AP1502 can also include multiple AP-side optoelectronic conversion modules. For the description of the AP1502 structure in this example, refer to the description of the CP1501 structure, and the details are not repeated here. For the description of the CP1501 structure and the AP1502 structure shown in this embodiment, refer to Fig.14The corresponding description is not repeated in detail. 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 1500 is applied. For example, if the optical communication system 1500 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 CP1501 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 1500 is applied to an optical transport network (OTN), the CP and AP can both be OTN devices. The optical communication system 1500 shown in this example can also be applied to a data center network (DCN) or a metropolitan area network, etc., without specific limitation.

[0079] 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 light source, characterized in that: It comprises a laser and a filter module, wherein the filter module comprises a first filter element and a second filter element, and the first filter element and the second filter element are non-hermetic packaged to form an optical resonant cavity structure; The laser is used to send a first optical signal to the filter module; The filtering module is based on the optical resonant cavity structure, and is used to filter the first optical signal to obtain a filtered optical signal, wherein the filtered optical signal corresponds to a first spectrum, and the first spectrum has a comb-shaped spectrum structure. The filtered optical signal is used to measure a second spectrum, and the second spectrum is a spectrum corresponding to a second optical signal emitted by the light source to be measured.

2. The light source according to claim 1, characterized in that The filtering module also includes a third filter element, which is used to filter the first optical signal based on a first filtering spectrum. The wavelength of the first optical signal includes a first wavelength, and the first wavelength corresponds to a first transmittance in the first filtering spectrum. The first transmittance is used to identify the first spectrum.

3. The light source according to claim 2, characterized in that The optical resonant cavity structure is used to filter the first optical signal based on a second filtering spectrum, the wavelength of the first optical signal includes N second wavelengths, each of the N second wavelengths corresponds to a second transmittance in the second filtering spectrum, and N is any integer greater than 1; the first wavelength is different from each of the second wavelengths, and the first transmittance is different from each of the second transmittances.

4. The light source according to claim 3, characterized in that The first transmittance is smaller than each of the second transmittances, or the first transmittance is larger than each of the second transmittances.

5. The light source according to any one of claims 2 to 4, characterized in that: The light source includes an isolator, and at least one of the first filter element and the second filter element covers a first port of the isolator, and the first port is located on a transmission optical path of the first optical signal emitted from the laser.

6. The light source according to any one of claims 2 to 5, characterized in that: The light source includes an isolator, the third filter component covers a second port of the isolator, and the second port is located on a transmission optical path of the first optical signal emitted from the laser.

7. The light source according to any one of claims 2 to 4, characterized in that: The light source includes a lens group, which includes at least one lens. One of the first filter, the second filter and the third filter covers the surface of the lens, and the surface of the lens is located on the transmission optical path of the first optical signal emitted from the laser.

8. The light source according to any one of claims 2 to 4, characterized in that: The light source includes an output optical waveguide, and one of the first filter, the second filter and the third filter covers a target surface of the output optical waveguide, the target surface is a light entrance surface or a light exit surface of the output optical waveguide, and the target surface is located on a transmission optical path of the first optical signal emitted from the laser.

9. The light source according to any one of claims 2 to 4, characterized in that: One of the first filter element, the second filter element and the third filter element covers the light outlet of the laser.

10. The light source according to any one of claims 2 to 4, characterized in that: The filtering module also includes a first light-transmitting plate, which includes a first side surface and a second side surface that are located opposite to each other. The first side surface and the second side surface are located on a transmission optical path of the first optical signal emitted from the laser. The first filtering component covers the first side surface, and the third filtering component covers the second side surface.

11. The light source according to claim 10, characterized in that The filtering module further includes a second light-transmitting plate, the second light-transmitting plate includes a third side surface, the third side surface is located on a transmission optical path of the first optical signal emitted from the laser, and the second filtering element covers the third side surface.

12. A measuring device, characterized in that: comprising a detection module, a processor and a light source according to any one of claims 1 to 11, wherein the light source, the detection module and the processor are connected in sequence; The light source is used to send the filtered light signal to the detection module; The detection module is used to perform photoelectric conversion on the filtered optical signal to obtain a first detection electrical signal, and send the first detection electrical signal to the processor; The detection module is also used to receive the second light signal from the light source to be tested, perform photoelectric conversion on the second light signal to obtain a second detection electrical signal, and send the second detection electrical signal to the processor; The processor is used for measuring the second spectrum according to the first detection electrical signal and the second detection electrical signal.

13. The measuring device according to claim 12, characterized in that The measuring device also includes an optical switch, whose input port is respectively connected to the light source and the light source to be measured, and whose output end is connected to the detection module. The optical switch is used to send the filtered optical signal and the second optical signal to the detection module in a time-sharing manner.

14. The measuring device according to claim 12, characterized in that The detection module includes a first detector and a second detector, the first detector is connected to the light source, and the second detector is connected to the light source to be measured, the first detector is used to receive the filtered light signal and send the first detection electrical signal to the processor; the second detector is used to receive the second light signal and send the second detection electrical signal to the processor.

15. An optical communication device, characterized in that: The optical communication device comprises a processor, a light source to be tested, a spectrometer, a light source and a detection module, wherein the light source is as described in any one of claims 1 to 11, wherein the light source to be tested, the spectrometer, the detection module and the processor are connected in sequence, the light source is connected to the detection module, and the processor is also connected to the light source to be tested; The processor is used to send a service electrical signal to the light source to be tested; The light source to be tested is used to convert the service electrical signal into a service optical signal, and send the service optical signal to the optical splitter; The optical splitter is used to split the service optical signal to obtain the second optical signal and the third optical signal, send the second optical signal to the detection module, and emit the third optical signal; The light source is used to send the filtered light signal to the detection module; The detection module is used to perform photoelectric conversion on the filtered optical signal to obtain a first detection electrical signal, and send the first detection electrical signal to the processor; The detection module is further used to perform photoelectric conversion on the second optical signal to obtain a second detection electrical signal, and send the second detection electrical signal to the processor; The processor is used for measuring the second spectrum according to the first detection electrical signal and the second detection electrical signal.

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