CN115913375A

CN115913375A - Optical device, optical module, optical communication apparatus, and optical communication method

Info

Publication number: CN115913375A
Application number: CN202110897639.4A
Authority: CN
Inventors: 李惠萍; 段建宏; 李晓磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2023-04-04
Also published as: WO2023011444A1

Abstract

The application discloses a light device. The optical device is applied to the field of optical communication. In an optical device, an optical source is used to transmit a first optical signal to an input-output port. The input/output port is used for receiving a second optical signal with a second wavelength and transmitting the second optical signal to the first filter. The first filter is configured to receive the mixed optical signal and transmit the mixed optical signal to the second filter. The second filter is used to split the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first interference optical signal generated by the first optical signal. The first PD is configured to receive one of the two optical signals. The second PD is for receiving another optical signal. In the application, two PD receives two optical signals output by the second filter, so that the adjusting time of the filter can be reduced, and the communication efficiency is improved.

Description

Optical device, optical module, optical communication apparatus, and optical communication method

Technical Field

The present application relates to the field of optical communications, and in particular, to an optical device, an optical module, an optical communication apparatus, and an optical communication method.

Background

In a single-fiber bidirectional optical communication system, two communication devices transmit optical signals in two directions through one optical fiber, so that optical fiber resources can be saved.

However, the communication apparatus may receive a reflected light signal of the optical signal transmitted from the local terminal. For example, an optical communication device transmits a first optical signal at a first wavelength to an optical network device over an optical fiber. The optical communication device receives a second optical signal at a second wavelength from the optical network device over the same optical fiber. Reflective end faces are present at the junctions of optical fibers and other optical devices. Accordingly, the optical communication device receives the reflected optical signal of the first optical signal. For optical communication devices, the reflected signal is of a disturbing optical signal. For this, after receiving a mixed optical signal including the disturbing optical signal and the second optical signal, the optical communication device may filter out the disturbing optical signal through a filter to obtain the second optical signal. In the foregoing example, the wavelength of the disturbing optical signal is a first wavelength and the wavelength of the second optical signal is a second wavelength. In practical applications, before the optical communication device and the optical network device do not agree on a communication wavelength, the optical communication device cannot determine the communication wavelength with the optical network device. For example, the wavelength of the interfering optical signal may be the second wavelength and the wavelength of the second optical signal may be the first wavelength.

Therefore, the optical communication apparatus takes a lot of time to adjust the filtering wavelength of the filter, thereby lowering communication efficiency.

Disclosure of Invention

The application provides an optical device, an optical module, optical communication equipment and an optical communication method, wherein two paths of optical signals output by two PD receiving filters can reduce the adjusting time of the filters, so that the communication efficiency is improved.

A first aspect of the present application provides a light device. The optical device includes a light source, a first filter, a second filter, an input/output port, a first Photodetector (PD), and a second PD. The light source is used for generating a first optical signal with a first wavelength. The optical source is used for transmitting a first optical signal to the input/output port through the first filter. The input/output ports may be connected to the optical network device by optical fibers. The input/output port is used for outputting a first optical signal and receiving a second optical signal with a second wavelength. The input/output port is used for transmitting the second optical signal to the first filter. The first filter is configured to receive the mixed optical signal and transmit the mixed optical signal to the second filter. The second filter is used to split the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first interfering optical signal of a first wavelength generated by the first optical signal. The first PD is configured to receive one of the two optical signals. The second PD is for receiving the other of the two optical signals. For example, the second filter filters the second electrical signal by a reflection function. When the filtering wavelength of the second filter is the first wavelength, the second filter transmits the second optical signal and the second filter reflects the first interference optical signal. At this time, the first PD is configured to receive the first interference optical signal to obtain a first electrical signal. The second PD is used for receiving the second optical signal and obtaining a second electric signal. In the subsequent process, the optical communication device may demodulate the second electrical signal. When the filtering wavelength of the second filter is a second wavelength, the second filter transmits the first interference optical signal, and the second filter reflects the second optical signal. At this time, the first PD is configured to receive the second optical signal to obtain a first electrical signal, and the second PD is configured to receive the first interference optical signal to obtain a second electrical signal. In the subsequent process, the optical communication device may demodulate the first electrical signal.

In the present application, the optical device may not need to adjust the filtering wavelength of the second filter regardless of whether the optical device uses the first wavelength or the second wavelength. Therefore, by receiving the two optical signals output from the filters by the two PDs, the adjustment time of the filters can be reduced, thereby improving the communication efficiency.

In an alternative form of the first aspect, the second filter is an unadjustable filter. For example, the non-tunable filter may be a Dense Wavelength Division Multiplexing (DWDM) filter or a Coarse Wavelength Division Multiplexing (CWDM) filter. Wherein the cost of the optical device can be reduced by using a non-tunable filter.

In an alternative form of the first aspect, the light device further comprises a light reflecting sheet. The second PD is configured to receive the other of the two optical signals via the reflector. Wherein, through increasing the reflector panel, can change the mounted position of second PD, and then increase the flexibility of design.

In an alternative form of the first aspect, the light source comprises a laser and a Thermal Electric Cooler (TEC). The TEC is used to adjust the wavelength of the optical signal output from the laser by changing the temperature. Wherein, by using the TEC, the cost of the light source can be reduced.

In an alternative form of the first aspect, the optical module further comprises a third PD. The third PD is configured to receive a reflected optical signal of the first optical signal on the first filter. The optical module needs to adjust a filtering wavelength of the first filter. Specifically, the first filter transmits a first optical signal at a first wavelength. The first filter reflects a second optical signal at a second wavelength. If the energy of the reflected light signal of the first optical signal is greater than a certain threshold value, it indicates that the filtering wavelength of the first filter needs to be adjusted continuously. Therefore, by adding the third PD, the accuracy of the adjusted filtering wavelength can be increased, thereby improving the communication quality.

In an alternative form of the first aspect, the optical module further comprises an isolator. An isolator is between the light source and the first filter. The isolator is used for isolating a second interference optical signal with a first wavelength generated by the first optical signal. The second interference optical signal reflected back to the light source along the link and the first optical signal generated by the light source generate an interference phenomenon, which affects the quality of the first optical signal output by the light source. In the application, the second interference optical signal can be isolated by adding the isolator, so that the communication quality is improved. Similarly, an isolator may also be used to isolate the second optical signal.

A second aspect of the present application provides an optical module. The optical module comprises a demodulation module and the optical device of the first aspect or any one of the alternatives of the first aspect. The demodulation module is configured to receive a first electrical signal from a first PD in the optical device. The demodulation module is configured to receive a second electrical signal from a second PD in the optical device. The demodulation module includes a comparator and an optical switch. The comparator is used for comparing the first electric signal with the second electric signal to obtain a control signal. The optical switch is used for receiving the first electric signal and the second electric signal and outputting a target electric signal according to the control signal. The target electrical signal is an electrical signal with a larger current or voltage in the first electrical signal and the second electrical signal. By adding the comparator and the optical switch, the number of subsequent electronic devices can be reduced, and the cost of the optical module is reduced.

In an optional manner of the second aspect, the demodulation module further includes a Trans Impedance Amplifier (TIA) unit. The comparator is used for comparing the magnitude of the first electric signal amplified by the TIA unit and the magnitude of the second electric signal amplified by the TIA unit. Wherein, by comparing the two electric signals amplified by TIA, the accuracy of the comparison result can be increased.

A third aspect of the present application provides an optical module. The optical module comprises a demodulation module and the optical device of the first aspect or any one of the alternatives of the first aspect. The demodulation module is configured to receive a first electrical signal from a first PD in the optical device. The demodulation module is configured to receive a second electrical signal from a second PD in the optical device. The demodulation module includes an addition unit. The addition unit is used for adding the first electric signal and the second electric signal and outputting a target electric signal. The addition unit can reduce the complexity of a circuit, thereby reducing the cost of the optical module.

In an optional manner of the third aspect, the demodulation module further comprises a TIA. The TIA is used to amplify a target electrical signal. The TIA amplifies the target electric signal, so that the number of TIAs can be reduced, and the cost of the optical module is reduced.

A fourth aspect of the present application provides an optical communication device. The optical communication device comprises a processor and an optical device as described in any of the second, third or third aspects above. The optical module is used for transmitting a first optical signal with a first wavelength. The optical module is used for receiving a second optical signal with a second wavelength. The optical module is used for obtaining a target electric signal according to the mixed optical signal. The mixed optical signal includes a first interfering optical signal at a first wavelength generated by the first optical signal and the second optical signal. The optical module is used for sending the target electric signal to the processor. The processor is used for receiving the target electric signal from the optical module and processing data of the target electric signal.

A fifth aspect of the present application provides an optical communication method. The optical communication method may be applied to an optical device, an optical module, or an optical communication apparatus. The following describes an optical communication method by taking an example in which the optical communication method is applied to an optical communication apparatus. The optical communication method includes the steps of: the optical communication device transmits a first optical signal at a first wavelength. An optical communication device receives a mixed optical signal. The mixed optical signal includes a second optical signal at a second wavelength and a first interfering optical signal at a first wavelength generated by the first optical signal. The optical communication device splits the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first disturbing optical signal. The optical communication device performs photoelectric conversion on one of the two optical signals by the first PD to obtain a first electrical signal. The optical communication device performs photoelectric conversion on the other of the two optical signals by the second PD to obtain a second electrical signal.

In an alternative form of the fifth aspect, the optical communication device splits the mixed optical signal into two optical signals by the second filter. Wherein the second filter is an unmodulatable filter.

In an optional manner of the fifth aspect, the optical communication method further includes: the optical communication device compares the first electrical signal and the second electrical signal to obtain a control signal. And the optical communication equipment performs data processing on the target electric signal according to the control signal. Wherein the target electrical signal is the larger electrical signal of the first electrical signal and the second electrical signal.

In an alternative form of the fifth aspect, the optical communication device compares magnitudes of the first electrical signal amplified by the TIA unit and the second electrical signal amplified by the TIA unit.

In an optional manner of the fifth aspect, the optical communication method further includes: the optical communication device adds the first electrical signal and the second electrical signal to obtain a target electrical signal.

In an optional manner of the fifth aspect, the optical communication method further includes: the optical communication device amplifies the target electrical signal through the TIA.

In an optional manner of the fifth aspect, before the optical communication apparatus performs optical-to-electrical conversion on the other of the two optical signals by the first PD, the optical communication method further includes: the optical communication device changes the transmission direction of another optical signal by the reflection sheet.

In an optional manner of the fifth aspect, the optical communication method further includes: the optical communication device adjusts the wavelength of the first optical signal through the TEC.

In an alternative form of the fifth aspect, the optical communication device transmits the first optical signal at the first wavelength through a first filter. The optical communication method further includes: the optical communication device measures a power of a reflected optical signal of the first optical signal on the first filter.

In an optional manner of the fifth aspect, the optical communication method further includes: the optical communication device isolates a second interference optical signal of the first wavelength generated by the first optical signal through an isolator.

A sixth aspect of the present application provides an optical communication system. The optical communication system comprises an optical network device and the optical communication device of the fourth aspect. The optical network device is configured to transmit a second optical signal at a second wavelength to the optical communication device. The optical network device is configured to receive a first optical signal at a first wavelength from the optical communication device. An optical communication device is configured to receive a mixed optical signal. The mixed optical signal includes a second optical signal at a second wavelength and a first interfering optical signal at a first wavelength generated by the first optical signal. The optical communication device is configured to split the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first disturbing optical signal. The optical communication device is used for performing photoelectric conversion on one of the two optical signals through the first PD to obtain a first electric signal. The optical communication device is used for performing photoelectric conversion on the other optical signal in the two optical signals through the second PD to obtain a second electric signal.

In an alternative form of the sixth aspect, the optical network device is configured to receive the target mixed optical signal. The target mixed optical signal includes a first optical signal and a target disturbing optical signal. The optical network device is further configured to split the target mixed optical signal into a first optical signal of a first wavelength and a target interfering optical signal of a second wavelength generated by a second optical signal. The optical network device is further configured to perform photoelectric conversion on the first optical signal or the target interference optical signal through the third PD to obtain a third electrical signal. The optical network device is further configured to perform optical-to-electrical conversion on the target interference optical signal or the first optical signal through the fourth PD to obtain a fourth electrical signal. Wherein the third PD and the fourth PD receive different optical signals. For example, when the third PD receives the first optical signal, the fourth PD receives the target disturbing optical signal. When the third PD receives the target disturbing optical signal, the fourth PD receives the first optical signal.

Drawings

Fig. 1 is a schematic view of a first structure of a light device provided in the present application;

FIG. 2 is a schematic diagram of a second configuration of an optical device provided herein;

fig. 3 is a first structural schematic diagram of a light module provided in the present application;

fig. 4 is a schematic diagram of a first structure of a demodulation module provided in the present application;

fig. 5 is a second structural diagram of a demodulation module provided in the present application;

fig. 6 is a second structural schematic diagram of an optical module provided in the present application;

fig. 7 is a third structural diagram of a demodulation module provided in the present application;

fig. 8 is a schematic structural diagram of an optical communication device provided in the present application;

fig. 9 is a schematic flow chart of an optical communication method provided in the present application;

fig. 10 is a first schematic diagram of an optical communication system provided in the present application;

fig. 11 is a second schematic diagram of an optical communication system provided in the present application.

Detailed Description

It is to be understood that the use of "first," "second," "target," and the like, herein are for purposes of descriptive differentiation only and are not to be construed as indicating or implying relative importance, nor order. In addition, reference numerals and/or letters are repeated among the various figures of the present application for sake of brevity and clarity. Repetition does not indicate a strict, restrictive relationship between the various embodiments and/or configurations.

The optical device in the application is applied to the field of optical communication, and particularly can be applied to a single-fiber bidirectional optical communication system. In a single-fiber bidirectional optical communication system, optical communication equipment and optical network equipment transmit optical signals with different wavelengths in two directions through one optical fiber. The optical communication device filters the interference optical signal of the first wavelength generated by the local terminal through the filter. However, before the optical communication device and the optical network device do not agree on the communication wavelength, the optical communication device cannot determine the communication wavelength with the optical network device. For example, the wavelength of the interfering optical signal may be either the first wavelength or the second wavelength. Therefore, the optical communication apparatus takes a lot of time to adjust the filtering wavelength of the filter, thereby lowering communication efficiency.

To this end, the present application provides a light device. An optical communication apparatus includes the optical device. Fig. 1 is a schematic view of a first structure of a light device provided in the present application. As shown in fig. 1, the optical device 101 includes a light source 102, a first filter 103, an input-output port 104, a second filter 105, a first PD 106, and a second PD 107.

The light source 102 may be a tunable laser. Such as Distributed Feedback (DFB) lasers, distributed Bragg Reflector (DBR) lasers, external cavity lasers, etc. The light source 102 is configured to generate a first optical signal at a first wavelength. The first optical signal is transmitted through the first filter 103. The first filter 103 may be a Fabry-Perot Interferometer (FPI) filter. The optical source 102 is configured to transmit a first optical signal to the input/output port 104 via the first filter 103. The input/output port 104 may be connected to an optical fiber or an optical fiber adapter. The other end of the optical fiber may be connected to optical network equipment. The input/output port 104 is used for outputting a first optical signal. The input/output port 104 is also for receiving a second optical signal at a second wavelength. The input/output port 104 is used for transmitting the second optical signal to the first filter 103.

Due to the presence of a reflective end face, such as an optical fiber end face, an end face of the input/output port 104, etc., the first filter 103 may receive a reflected optical signal of the first optical signal on the reflective end face. The reflected light signal includes an interfering light signal at a first wavelength. At this time, the first filter 103 is used to receive the mixed optical signal. The mixed optical signal includes the second optical signal and the disturbing optical signal. The surface of the first filter 103 reflects the mixed optical signal and transmits the mixed optical signal to the second filter 105. The second filter 105 is used to split the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first interfering optical signal of a first wavelength generated by the first optical signal. The first disturbing optical signal may be a part of the optical signal of the disturbing optical signal. See the following description relating to the second disturbing light signal.

The first PD 106 is configured to receive one of two optical signals. The second PD107 is for receiving the other of the two optical signals. For example, assume that the second filter 105 filters the second electrical signal by a reflection function. When the filtering wavelength of the second filter 105 is the first wavelength, the second filter 105 transmits the second optical signal and the second filter 105 reflects the first disturbing optical signal. At this time, the first PD 106 is configured to receive the first interference optical signal to obtain a first electrical signal. The second PD107 is configured to receive the second optical signal and obtain a second electrical signal. When the filter wavelength of the second filter 105 is the second wavelength, the second filter 105 transmits the first interference optical signal and the second filter 105 reflects the second optical signal. At this time, the first PD 106 is configured to receive the second optical signal to obtain a first electrical signal, and the second PD107 is configured to receive the first interference optical signal to obtain a second electrical signal.

Therefore, regardless of whether the wavelength of the first disturbing optical signal is the first wavelength or the second wavelength, the optical device 101 may not need to adjust the filtering wavelength of the second filter 105. In the present application, by receiving two optical signals output from the second filter 105 by two PDs, the adjustment time of the filters can be reduced, thereby improving the communication efficiency. Also, to reduce the cost of the optical device 101, the second filter may be a non-tunable filter. An untuned filter is also referred to as an untuned filter. The non-tunable filter may be a Dense Wavelength Division Multiplexing (DWDM) filter or a Coarse Wavelength Division Multiplexing (CWDM) filter, etc.

In the aforementioned optical device 101 of fig. 1, the two PDs are respectively configured to receive the transmitted light signal and the reflected light signal output by the second filter 105. To increase the flexibility of the location of the two PDs, the optical device 101 may also include a light-reflecting sheet. The second PD107 is for receiving the other of the two optical signals through the reflector. For example, fig. 2 is a schematic diagram of a second structure of the optical device provided in the present application. The description of the relevant devices in fig. 2 may refer to the description of fig. 1. As shown in fig. 2, the light device 101 further includes a light reflecting sheet 201. The reflector 201 is used to receive the transmitted light signal output by the second filter 105. The light-reflecting sheet 201 serves to transmit the reflected transmitted light signal to the second PD 107.

As can be seen from the foregoing description of fig. 1, the first filter 103 is used for transmitting the first optical signal and reflecting the second optical signal. However, before the optical device and the optical network equipment do not agree on the communication wavelength, the communication wavelengths of the first optical signal and the second optical signal are unknown. Therefore, the optical device needs to adjust the filtering wavelength of the first filter 103, so that the first filter 103 is used to transmit the first optical signal and reflect the second optical signal. After the optical device and the optical network equipment agree on a communication wavelength, the optical device 101 needs to check the filtering wavelength of the first filter 103. Accordingly, the optical device 101 may further include a third PD. As shown in fig. 2, the third PD 203 is configured to receive a reflected optical signal of the first optical signal on the first filter 103. If the energy of the reflected light signal received by the third PD 203 is greater than a certain threshold, it means that the transmittance of the first light signal on the first filter 103 is too low. The optical device 101 needs to continue to adjust the filtering wavelength of the first filter. If the energy of the reflected light signal received by the third PD 203 is less than or equal to the threshold, it indicates that the transmittance of the first light signal on the first filter 103 meets the requirement. The optical device 101 may maintain the current state of the first filter 103.

As can be seen from the foregoing description of fig. 1, the first filter 103 is used for transmitting the first optical signal and reflecting the second optical signal. Therefore, when the mixed optical signal received by the first filter 103 includes the interference optical signal of the first wavelength, a part of the interference optical signal of the first wavelength may be transmitted through the first filter 103. At this time, the disturbing light signal transmitted through the first filter 103 is also referred to as a second disturbing light signal. The second interference optical signal returns to the light source along the transmission path of the first optical signal, and the second interference optical signal reflected to the light source interferes with the first optical signal emitted by the light source, so that the quality of the first optical signal is affected. To this end, the optical device 101 may further include an isolator 202. As shown in fig. 2, the optical source 102 is configured to transmit a first optical signal to the input/output port 104 through the isolator 202 and the first filter 103. The isolator 202 is configured to transmit the first optical signal. Isolator 202 is also used to isolate a second interfering optical signal of the first wavelength generated by the first optical signal.

Similarly, part of the second optical signal may also be transmitted through the first filter 103. The second optical signal transmitted through the first filter 103 returns to the optical source along the transmission path of the first optical signal. At this time, the second optical signal reflected to the light source interferes with the first optical signal emitted by the light source, thereby affecting the quality of the first optical signal. Thus, the isolator 202 may also be used to isolate the second optical signal.

As can be seen from the foregoing description, the optical device 101 may be connected to an optical network device through an optical fiber. To confirm whether the optical device 101 is connected to the optical network equipment, the optical device 101 may detect the second optical signal. Specifically, as shown in fig. 2, the optical device 101 further includes an optical splitter 204 and a fourth PD 205. The optical splitter 204 is configured to receive the second optical signal from the input/output port 104. The optical splitter 204 is configured to split a portion of the optical signal from the second optical signal. Part of the optical signal is also referred to as the measurement optical signal. The fourth PD 205 is for receiving the measurement optical signal. Through the fourth PD 205, it can be determined whether the optical fiber is connected to the optical network device. And, when the second optical signal carries the tuning signal, the fourth PD 205 may determine the wavelength of the second optical signal.

As can be seen from the foregoing description, the wavelength of the first optical signal may be either the first wavelength or the second wavelength. To reduce the cost of the light source 102, the optical device may adjust the wavelength of the first optical signal by controlling the temperature of the TEC. Specifically, the light source 102 includes a laser and a Thermal Electric Cooler (TEC). The TEC is used to adjust the wavelength of the first optical signal output by the laser by changing the temperature.

It should be understood that the optical device 101 shown in fig. 1 and 2 is merely one or more examples provided in this application. In practical applications, those skilled in the art can adapt the method according to the needs. After the adaptive change, if the optical device 101 receives the two optical signals output by the second filter through the two PDs, the optical device should still fall within the protection scope of the present application. The adaptation includes, but is not limited to, any one or more of the following.

For example, in fig. 2, the optical device 101 further includes a convex lens. The convex lens is used for focusing the second optical signal output by the optical splitter 204 to obtain the second optical signal with more concentrated energy. The convex lens transmits the focused second optical signal to the first filter 103.

For example, in fig. 1 and 2, the first filter 103 is used to transmit a first optical signal and reflect a second optical signal. In practical applications, the positions of the light source 102 and the second filter 105 may be interchanged. At this time, the first filter 103 is used to reflect the first optical signal and transmit the second optical signal. Similarly, in fig. 1 and 2, the first PD 106 is configured to receive the reflected optical signal of the second filter 105. The second PD107 is for receiving the transmitted light signal of the second filter 105. In practical applications, the positions of the first PD 106 and the second PD107 may be interchanged. At this time, the first PD 106 is configured to receive the transmitted light signal of the second filter 105. The second PD107 is configured to receive the reflected optical signal of the second filter 105.

For example, in fig. 2, the reflective sheet 201 is used to reflect the transmitted light signal of the second filter 105. In practical applications, the reflector 201 may be used to reflect the reflected light signal of the second filter 105.

The optical device in the present application is described above. The following describes an optical module in the present application. Fig. 3 is a first structural schematic diagram of an optical module provided in the present application. As shown in fig. 3, the optical module 301 includes an optical device 101 and a demodulation module 302. The optical device 101 is described with reference to the related description of fig. 1 and fig. 2. The optical device 101 includes a first PD 106 and a second PD 107. The first PD 106 is configured to output a first electrical signal. The second PD107 is for outputting a second electric signal. The demodulation module 302 includes a comparator 303 and an optical switch 304. The comparator 303 is configured to receive the first electrical signal from the first PD 106. The comparator 303 is configured to receive the second electrical signal from the second PD 107. The comparator 303 is configured to compare magnitudes of the first electrical signal and the second electrical signal to obtain a control signal. The optical switch 304 is configured to receive the first electrical signal and the second electrical signal, and output a target electrical signal according to a control signal. The target electrical signal is an electrical signal with a larger current or voltage among the first electrical signal and the second electrical signal. For example, the control signal may be high or low. When the control signal is high, the optical switch 304 outputs a first electrical signal. When the control signal is low, the optical switch 304 outputs a second electrical signal. The electric current of the electric signals obtained by the first PD 106 and the second PD107 is small. When the comparator 303 compares two smaller currents, an erroneous result may be obtained. To improve the accuracy of the comparison, the demodulation module 302 may further include a Trans Impedance Amplifier (TIA) unit. The TIA unit is used for amplifying the first electric signal and the second electric signal. The comparator 303 is configured to compare the first electrical signal and the second electrical signal amplified by the TIA unit. To facilitate understanding of the demodulation module 302 in this application. The following provides a schematic diagram of the structure of two demodulation modules 302.

Fig. 4 is a first structural diagram of a demodulation module provided in the present application. As shown in fig. 4, the demodulation module 302 includes a TIA unit, a comparator 303, an optical switch 304, and R1 to R4. Wherein the TIA unit includes a TIA 401 and a TIA 402. The input of the TIA 401 is connected to the first PD 106 (not shown). The TIA 401 is to receive a first electrical signal from the first PD 106. The TIA 401 is to amplify the first electrical signal. The output of the TIA 401 is connected to the comparator 303 and the optical switch 304, respectively. The input of the TIA 402 is connected to the second PD107 (not shown). The TIA 402 is to receive a second electrical signal from the second PD 107. The TIA 402 is to amplify the second electrical signal. The output of the TIA 402 is connected to the comparator 303 and the optical switch 304, respectively. The comparator 303 is configured to compare the amplified first electrical signal and the amplified second electrical signal to obtain a control signal. The output of the comparator 303 is connected to an optical switch 304. The optical switch 304 is configured to receive the first electrical signal and the second electrical signal, and output a target electrical signal according to a control signal. The target electrical signal is the larger of the first electrical signal and the second electrical signal.

Wherein a first terminal of R1 is connected to an input terminal of TIA 401. The second terminal of R1 is connected to the output terminal of TIA 401. R1 is used to limit the voltage and similarly, a first terminal of R2 is connected to an input terminal of TIA 402. A second terminal of R2 is connected to the output terminal of TIA 402. R2 is used to limit the voltage. A first terminal of R3 is connected to the output of TIA 401. A second terminal of R3 is connected to a first input terminal of comparator 303. R3 is for converting the output level of the first electrical signal. Similarly, the first terminal of R4 is connected to the output terminal of TIA 402. A second terminal of R4 is connected to a second input terminal of comparator 303. R4 is for converting the output level of the second electric signal.

Fig. 5 is a second structural diagram of a demodulation module provided in the present application. As shown in fig. 5, the demodulation module 302 includes a TIA unit, a comparator 303, an optical switch 304, and R1 to R7. Wherein the TIA unit includes a TIA501 and a TIA 502. A first input of the TIA501 is connected to a first PD 106 (not shown). A second input of the TIA501 is connected to ground. The TIA501 is to receive a first electrical signal from the first PD 106. The TIA501 is to amplify the first electrical signal. The output of the TIA501 is connected to the comparator 303. A first input of the TIA 502 is connected to the second PD107 (not shown). A second input of the TIA501 is connected to ground. The TIA 502 is to receive a second electrical signal from the second PD 107. The TIA 502 is to amplify the second electrical signal. The output of the TIA501 is connected to the comparator 303. The comparator 303 is configured to compare the amplified first electrical signal with the amplified second electrical signal to obtain a control signal. A first input of the optical switch 304 is connected to the first PD 106. A second input of the optical switch 304 is connected to the second PD 107. A control input of the optical switch 304 is connected to an output of the comparator 303. The optical switch 304 is configured to receive the first electrical signal and the second electrical signal, and output a target electrical signal according to the control signal. The target electrical signal is the larger of the first electrical signal and the second electrical signal.

Wherein the first terminal of R1 is connected to the input terminal of TIA 501. The second terminal of R1 is connected to the output terminal of TIA 501. R1 is used to limit the voltage and similarly, a first terminal of R2 is connected to an input terminal of TIA 502. A second terminal of R2 is connected to the output of TIA 502. R2 is used to limit the voltage. The first terminal of R3 is connected to the output terminal of TIA 501. A second terminal of R3 is connected to a first input terminal of comparator 303. R3 is used to convert the current signal generated by the first electrical signal into a voltage signal. Similarly, the first terminal of R4 is connected to the output of TIA 502. A second terminal of R4 is connected to a second input terminal of comparator 303. R4 is used to convert the current signal generated by the second electrical signal into a voltage signal. The comparator 303 also includes a high voltage end and a low voltage end. The low voltage terminal of the comparator 303 is grounded. The high voltage terminal of the comparator 303 is connected to the power supply Vcc. A first terminal of R7 is connected to the output terminal of comparator 303. The second terminal of R7 is connected to the high voltage terminal of comparator 303. R7 is used to divide the voltage at the VCC input. A first terminal of R5 is connected to an input terminal of TIA 501. A second terminal of R5 is connected to a first input terminal of the optical switch 304. R5 is used to shunt the current generated by the first electrical signal. Similarly, a first terminal of R6 is connected to an input of TIA 502. A second terminal of R6 is connected to a second input terminal of the optical switch 304. R6 is used to shunt the current generated by the second electrical signal.

The optical module comprising the optical switch and the comparator is described above. The optical module including the addition unit is described below. Fig. 6 is a second structural schematic diagram of an optical module provided in the present application. As shown in fig. 6, the optical module 601 includes an optical device 101 and a demodulation module 602. The optical device 101 is described with reference to the related description of fig. 1 and fig. 2. The optical device 101 includes a first PD 106 and a second PD 107. The first PD 106 is configured to output a first electrical signal. The second PD107 is for outputting a second electric signal. The demodulation module 602 comprises an adding unit 603. The adding unit 603 is configured to receive the first electrical signal from the first PD 106. The adding unit 603 is configured to receive the second electrical signal from the second PD 107. The adding unit 603 is configured to add the first electrical signal and the second electrical signal, and output a target electrical signal. Wherein the structure of the demodulation module 602 is simpler than the demodulation module 302 in fig. 3. Therefore, the cost of the optical module can be reduced by the addition unit.

In practical applications, the demodulation module 602 may further include a TIA. The TIA is for amplifying the target electric signal output by the addition unit 603. The target electrical signal output by the adding unit 603 is amplified, so that the number of TIAs can be reduced, and the cost of the optical module can be reduced. To facilitate understanding of the demodulation module 602 in this application. A schematic diagram of the structure of the demodulation module 602 is provided below.

Fig. 7 is a third structural diagram of a demodulation module provided in the present application. As shown in fig. 7, the demodulation module 602 includes a TIA 701, an addition unit 603, and R1 to R4. The adding unit 603 may be an operational amplifier (OPA), among others. A first input of the adding unit 603 is connected to the first PD 106 (not shown in the figure). The adding unit 603 is configured to receive the first electrical signal from the first PD 106. A second input of the adding unit 603 is connected to a second PD107 (not shown in the figure). The adding unit 603 is configured to receive the second electrical signal from the second PD 107. The adding unit 603 is configured to add the first electrical signal and the second electrical signal to obtain a target electrical signal. The output of the summing unit 603 is coupled to the input of TIA 701. The TIA 701 is to receive a target electrical signal from the adding unit 603. The TIA 701 is to amplify a target electrical signal.

Wherein a first end of R1 is connected to a first PD 106 (not shown). A second terminal of R1 is connected to a first input terminal of an adding unit 603. R1 is used for converting a current signal generated by the first electric signal into a voltage signal. Similarly, a first terminal of R2 is connected to a second PD107 (not shown). A second terminal of R2 is connected to a second input terminal of the adding unit 603. R2 is used to convert the current signal generated by the second electrical signal into a voltage signal. A first terminal of R3 is connected to a first input terminal of the adding unit 603. A second terminal of R3 is connected to the output of the adding unit 603. R3 is used for partial pressure. A first terminal of R4 is connected to a second input terminal of the adding unit 603. The second end of R4 is grounded. R4 is used for partial pressure.

It is to be understood that when the first and second inputs of the adding unit 603 have currents of opposite signs, the adding unit 603 is adapted to add the two voltages of opposite signs. At this time, the adding unit 603 is configured to subtract the first electrical signal and the second electrical signal. Therefore, the adding unit 603 may also be referred to as a subtracting unit.

The light module is described above in the present application. The following describes an optical communication apparatus in the present application. Fig. 8 is a schematic structural diagram of an optical communication device provided in the present application. As shown in fig. 8, the optical communication device 801 includes an optical module 802 and a processor 803. The description of the light module 802 may refer to the related description in fig. 3 or fig. 6 described above. The optical module 802 is configured to transmit a first optical signal at a first wavelength. The optical module 802 is configured to receive a second optical signal at a second wavelength. The optical module 802 is configured to obtain a target electrical signal according to the mixed optical signal. The mixed optical signal includes the second optical signal and a first interfering optical signal at a first wavelength generated by the first optical signal.

The optical module 802 is used to send the target electrical signal to the processor 803. The processor 803 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP. The processor 803 may further include a hardware chip or other general purpose processor. The hardware chip may be an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The processor 803 is configured to receive the target electrical signal from the optical module 802 and perform data processing on the target electrical signal.

In other embodiments, the optical communication device may further include a memory. The memory may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory.

The application also provides a digital processing chip. Integrated with circuitry and one or more interfaces to implement the functions of the processor 803 described above. When the digital processing chip has a memory integrated therein, the digital processing chip can perform the functions implemented by the optical communication device in the foregoing embodiments. When the digital processing chip is not integrated with the memory, the digital processing chip can be connected with the external memory through an interface. The digital processing chip implements the functions implemented by the optical communication device according to the program codes stored in the external memory.

The optical communication apparatus in the present application is described above, and the optical communication method in the present application is described below. Fig. 9 is a flowchart illustrating an optical communication method provided in the present application. As shown in fig. 9, the optical communication method includes the following steps.

In step 901, an optical communication device transmits a first optical signal at a first wavelength.

In step 902, the optical communication device receives a mixed optical signal. The mixed optical signal includes a first interfering optical signal at a first wavelength and a second optical signal at a second wavelength generated by the first optical signal. The reflecting end surface in the transmission path of the first optical signal reflects the first optical signal to form a first interference optical signal with a first wavelength. When transmission paths of the first optical signal and the second optical signal overlap, for example, the first optical signal and the second optical signal in two directions are transmitted through one optical fiber, and the first interference optical signal and the second optical signal are mixed to obtain a mixed optical signal.

In step 903, the optical communication device splits the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first disturbing optical signal. For the optical communication device, the first disturbing optical signal is a disturbing signal. Since the wavelengths of the first disturbing optical signal and the second optical signal are different, the optical communication device may divide the mixed optical signal into the second optical signal and the first disturbing optical signal through the second filter.

In step 904, the optical communication device performs optical-electrical conversion on one of the two optical signals by the first PD to obtain a first electrical signal.

In step 905, the optical communication apparatus performs optical-electrical conversion on the other of the two optical signals by the second PD to obtain a second electrical signal. It should be understood that there is no strict timing constraint between step 904 and step 905.

The second filter may filter the second electrical signal by a transmission function or a reflection function. It is assumed that the second filter filters the second electrical signal by a reflection function. When the filtering wavelength of the second filter is the first wavelength, the second filter transmits the second optical signal, and the second filter reflects the first interference optical signal. At this time, the first PD is configured to receive the first interference optical signal to obtain a first electrical signal. The second PD is used for receiving the second optical signal and obtaining a second electric signal. In the subsequent process, the optical communication device may demodulate the second electrical signal. When the filtering wavelength of the second filter is a second wavelength, the second filter transmits the first interference optical signal, and the second filter reflects the second optical signal. At this time, the first PD is configured to receive the second optical signal to obtain a first electrical signal, and the second PD is configured to receive the first interference optical signal to obtain a second electrical signal. In the subsequent process, the optical communication device may demodulate the first electrical signal. Therefore, the optical communication apparatus may not need to adjust the filtering wavelength of the second filter regardless of whether the wavelength of the first optical signal is the first wavelength or the second wavelength. Therefore, the adjusting time of the filter can be reduced, and the communication efficiency is improved.

It is to be understood that with respect to the description in the optical communication method, reference may be made to the aforementioned description in the optical device, the optical module, and the optical communication apparatus. For example, the second filter is an unadjustable filter. For example, the optical communication device compares the magnitudes of the first electrical signal and the second electrical signal by the comparator to obtain the control signal. The optical communication device selects a target electrical signal between the first electrical signal and the second electrical signal according to the control signal. The target electrical signal is an electrical signal with a larger voltage or current of the first electrical signal and the second electrical signal. For example, the optical communication device adds the first electrical signal and the second electrical signal to obtain a target electrical signal. The optical communication device performs data processing on the target electrical signal.

The optical communication method in the present application is described above, and the optical communication system in the present application is described below. Fig. 10 is a first schematic diagram of an optical communication system provided in the present application. As shown in fig. 10, the optical communication system includes an optical communication apparatus 1001 and an optical network apparatus 1002.

The description of the optical communication apparatus 1001 may refer to the related description of the optical communication apparatus in fig. 8 described above. The optical communication device 1001 is configured to transmit a first optical signal of a first wavelength to the optical network device 1002. The optical communication device 1001 is configured to receive a mixed optical signal. The mixed optical signal includes a first interfering optical signal at a first wavelength and a second optical signal at a second wavelength generated by the first optical signal. The optical communication apparatus 1001 serves to split the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first disturbing optical signal. The optical communication apparatus 1001 is configured to perform optical-electrical conversion on one of two optical signals by the first PD to obtain a first electrical signal. The optical communication apparatus 1001 is configured to perform optical-electrical conversion on the other of the two optical signals by the second PD to obtain a second electrical signal.

The optical network device 1002 is configured to transmit a second optical signal of a second wavelength to the optical communication device 1001. The description of the optical network device 1002 may also refer to the related description of the optical communication device in fig. 8. For example, an optical network device is used to receive a target mixed optical signal. The optical network device is further configured to split the target mixed optical signal into a first optical signal of a first wavelength and a target interfering optical signal of a second wavelength generated by a second optical signal. The optical network device is further configured to perform photoelectric conversion on the first optical signal or the target interference optical signal through the third PD to obtain a third electrical signal. The optical network device is further configured to perform optical-to-electrical conversion on the target interference optical signal or the first optical signal through the fourth PD to obtain a fourth electrical signal. Wherein the third PD and the fourth PD receive different optical signals.

Fig. 11 is a second schematic diagram of an optical communication system provided in the present application. As shown in fig. 11, the optical communication system includes a demultiplexer/multiplexer 1101, a demultiplexer/multiplexer 1102, N optical communication devices, and N optical network devices. The description of the optical communication device and the optical network device may refer to the related description in fig. 10 described above. The N optical communication devices are used for sending first optical signals with N different wavelengths to the N optical network devices. Specifically, the N optical communication devices are configured to transmit first optical signals of N different wavelengths to the demultiplexer/multiplexer 1101. The N optical communication devices correspond to the N first optical signals with different wavelengths one by one. The wavelength division/combination device 1101 is configured to combine the N first optical signals with different wavelengths to obtain a combined first optical signal. The demultiplexer/combiner 1101 is configured to transmit the combined first optical signal to the demultiplexer/combiner 1102. The wavelength division/combination device 1102 is configured to perform wavelength division on the combined first optical signal to obtain N first optical signals with different wavelengths. The wavelength division/combination device 1102 is configured to transmit first optical signals with N different wavelengths to N optical network devices. The N first optical signals with different wavelengths correspond to the N optical network devices one by one. Conversely, the N optical network devices are configured to transmit N different wavelength second optical signals to the N optical communication devices. The N second optical signals with different wavelengths correspond to the N optical communication devices one by one. The second optical signal and the first optical signal have different wavelengths.

For any one optical communication device, the optical communication device may receive the mixed optical signal. The mixed optical signal includes a second optical signal and a reflected optical signal of the first optical signal transmitted by itself. The reflected light signal is also referred to as a first disturbing light signal. The optical communication device is configured to split the mixed optical signal into two optical signals. The two optical signals include a second optical signal and a first disturbing optical signal. The optical communication device is configured to perform optical-to-electrical conversion on one of the two optical signals by the first PD to obtain a first electrical signal. The optical communication device is configured to perform optical-to-electrical conversion on the other of the two optical signals by the second PD to obtain a second electrical signal.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.

Claims

1. A light device, comprising:

the device comprises a light source, a first filter, a second filter, an input/output port, a first photodetector PD and a second PD;

the optical source is used for generating a first optical signal with a first wavelength and transmitting the first optical signal to the input/output port through the first filter;

the input/output port is configured to output the first optical signal, receive a second optical signal with a second wavelength, and transmit the second optical signal to the first filter;

the first filter is used for receiving a mixed optical signal and transmitting the mixed optical signal to the second filter, wherein the mixed optical signal comprises a first interference optical signal with a first wavelength generated by the second optical signal and the first optical signal;

the second filter is configured to receive a mixed optical signal, and divide the mixed optical signal into two optical signals, where the two optical signals include the second optical signal and the first interference optical signal;

the first PD is used for receiving one of the two optical signals;

the second PD is configured to receive the other of the two optical signals.

2. The optical device according to claim 1,

the optical device further comprises a light reflecting sheet;

the second PD for receiving the other of the two optical signals comprises:

the second PD is configured to receive the other of the two optical signals through the reflector.

3. The optical device according to claim 1 or 2, characterized in that the light source comprises a laser and a thermo electric cooler TEC;

the TEC is used for adjusting the wavelength of an optical signal output by the laser by changing the temperature.

4. The optical device according to any of claims 1 to 3, wherein the optical module further comprises a third PD;

the third PD is used for receiving a reflected light signal of the first light signal on the first filter.

5. The optical device according to any one of claims 1 to 4, wherein the optical module further comprises an isolator between the light source and the first filter;

the isolator is used for isolating a second interference optical signal of the first wavelength generated by the first optical signal.

6. An optical device according to any of claims 1 to 5, characterized in that the second filter is a dense wavelength division multiplexing, DWDM, filter or a coarse wavelength division multiplexing, CWDM, filter.

7. A light module, comprising:

a demodulation module and a light device according to any of the preceding claims 1 to 6;

wherein the demodulation module is to receive a first electrical signal from the first PD in the optical device and a second electrical signal from the second PD in the optical device;

the demodulation module comprises a comparator and an optical switch;

the comparator is used for comparing the first electric signal with the second electric signal to obtain a control signal;

the optical switch is used for receiving the first electric signal and the second electric signal and outputting a target electric signal according to the control signal, wherein the target electric signal is the larger electric signal of the first electric signal and the second electric signal.

8. The optical module of claim 7, wherein the demodulation module further comprises a transimpedance amplifier (TIA) unit;

the comparator for comparing the magnitudes of the first electrical signal and the second electrical signal comprises:

the comparator is configured to compare magnitudes of the first electrical signal passing through the TIA unit and the second electrical signal passing through the TIA unit.

9. A light module, comprising:

wherein the demodulation module is configured to receive a first electrical signal from a first PD in the optical device and a second electrical signal from a second PD in the optical device;

the demodulation module comprises an addition unit;

the adding unit is used for adding the first electric signal and the second electric signal and outputting a target electric signal.

10. The optical module of claim 9, wherein the demodulation module further comprises a TIA;

the TIA is to amplify the target electrical signal.

11. An optical communication device, comprising:

a processor and a light module as claimed in any one of the preceding claims 7 to 10;

the optical module is configured to send a first optical signal with a first wavelength, receive a second optical signal with a second wavelength, obtain a target electrical signal according to a mixed optical signal, where the mixed optical signal includes a first interference optical signal with the first wavelength and the second optical signal generated by the first optical signal, and send the target electrical signal to the processor;

the processor is used for receiving the target electric signal from the optical module and processing data of the target electric signal.

12. An optical communication method, comprising:

transmitting a first optical signal at a first wavelength;

receiving a mixed optical signal comprising a second optical signal at a second wavelength and a first interfering optical signal at a first wavelength generated by the first optical signal;

splitting the mixed optical signal into two optical signals, the two optical signals including the second optical signal and the first interfering optical signal;

performing photoelectric conversion on one of the two optical signals through a first PD to obtain a first electrical signal;

the other of the two optical signals is photoelectrically converted by the second PD to obtain a second electrical signal.

13. The method of claim 12, further comprising:

comparing the first electric signal with the second electric signal to obtain a control signal;

and carrying out data processing on a target electric signal according to the control signal, wherein the target electric signal is the larger electric signal of the first electric signal and the second electric signal.

14. The method of claim 13,

comparing the magnitudes of the first electrical signal and the second electrical signal comprises:

comparing magnitudes of the first electrical signal through a transimpedance amplifier, TIA, unit and the second electrical signal through the TIA unit.

15. The method according to claim 12 or 13, characterized in that the method further comprises:

and adding the first electric signal and the second electric signal to obtain a target electric signal.

16. The method of claim 15, further comprising:

amplifying the target electrical signal by the TIA.

17. The method according to any one of claims 12 to 16, wherein before the photoelectrically converting the other of the two optical signals by the first PD, the method further comprises:

the transmission direction of the other optical signal is changed by the light reflecting sheet.

18. The method according to any one of claims 12 to 17, further comprising:

the wavelength of the first optical signal is adjusted by a thermo electric cooler TEC.

19. The method according to any one of claims 12 to 18,

transmitting a first optical signal at a first wavelength includes:

transmitting the first optical signal at a first wavelength through a first filter;

the method further comprises the following steps:

measuring the power of the reflected optical signal of the first optical signal on the first filter.

20. The method according to any one of claims 12 to 19, further comprising:

and isolating a second interference optical signal of the first wavelength generated by the first optical signal by an isolator.

21. The method of any one of claims 12 to 20,

splitting the mixed optical signal into two optical signals includes:

and dividing the mixed optical signal into the two optical signals through a second filter, wherein the second filter is a Dense Wavelength Division Multiplexing (DWDM) filter or a Coarse Wavelength Division Multiplexing (CWDM) filter.

22. An optical communication system, comprising:

an optical network device and an optical communication device according to claim 11;

the optical network device is configured to send a second optical signal with a second wavelength to the optical communication device, and receive a first optical signal with a first wavelength from the optical communication device;

the optical communication device is configured to receive a mixed optical signal, the mixed optical signal including a second optical signal at a second wavelength and a first interfering optical signal at a first wavelength generated by the first optical signal;

the optical communication device is configured to split the mixed optical signal into two optical signals, where the two optical signals include the second optical signal and the first interference optical signal;

the optical communication device is used for performing photoelectric conversion on one of the two optical signals through the first PD to obtain a first electric signal;

the optical communication device is configured to perform optical-to-electrical conversion on the other of the two optical signals by the second PD to obtain a second electrical signal.

23. The optical communication system of claim 22,

the optical network device being configured to receive a first optical signal of a first wavelength from the optical communication device includes: the optical network equipment is used for receiving a target mixed optical signal;

the optical network equipment is further configured to split the target mixed optical signal into a first optical signal with a first wavelength and a target interference optical signal with a second wavelength generated by the second optical signal;

the optical network device is further configured to perform photoelectric conversion on the first optical signal or the target interference optical signal through a third PD to obtain a third electrical signal;

the optical network device is further configured to perform optical-to-electrical conversion on the target interference optical signal or the first optical signal through a fourth PD to obtain a fourth electrical signal, where the third PD and the fourth PD receive different optical signals.