Optical signal transmission device and optical transmission system

Abstract

An embodiment of the present application provides an optical signal transmission device and an optical transmission system. The optical signal transmission device includes a first fiber collimator configured to input a first combined optical signal; a first beam splitter configured to split the first combined optical signal to obtain an optical signal of a first wavelength and an optical signal of a second wavelength, further configured to transmit the optical signal of the first wavelength to a first filter unit and further configured to transmit the optical signal of the second wavelength to a third fiber collimator; the first filter unit configured to transmit the optical signal of the first wavelength to the third fiber collimator; a die-2 fiber collimator configured to input an optical signal of the third wavelength; a second filter unit configured to transmit the optical signal of the third wavelength to the third fiber collimator; and a third fiber collimator configured to output a second combined optical signal. The second combined optical signal is an optical signal obtained through combining the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 202111664917.8, entitled "Optical Signal Transmission Device and Optical Transmission System," filed with the State Intellectual Property Administration of China on December 31, 2021, the entire contents of which are incorporated herein by reference.

[0002] Technical Field TECHNICAL FIELD Embodiments of the present application relate to the field of optical communication technology, and more particularly to an optical signal transmission device and an optical transmission system. [Background technology]

[0003] A multiplexer / demultiplexer is a key component in optical communication systems. As shown in FIG. 1, when a multiplexer / demultiplexer is configured to implement a multiplexing function, the multiplexer / demultiplexer combines multiple optical signals of different wavelengths received through multiple optical fibers into one channel of an optical signal and outputs the channel of the optical signal through one optical fiber. When a multiplexer / demultiplexer is configured to implement a demultiplexing function, the multiplexer / demultiplexer splits an optical signal received through one optical fiber based on wavelength and outputs the split optical signals through multiple optical fibers. However, when the multiplexer / demultiplexer shown in FIG. 1 is configured to implement a multiplexing function, if an optical signal input through at least one optical fiber of the multiple optical fibers is an optical signal obtained by combining multiple optical signals of different wavelengths, the multiplexer / demultiplexer cannot multiplex the combined optical signal with an optical signal input through another optical fiber. Summary of the Invention [Means for solving the problem]

[0004] An embodiment of the present application provides an optical signal transmission device and an optical transmission system. Even if a plurality of optical signals received through a plurality of optical fibers includes at least one combined optical signal, the plurality of optical signals can be multiplexed. Each of the at least one combined optical signal is an optical signal obtained by combining a plurality of optical signals of different wavelengths.

[0005] According to a first aspect, there is provided an optical signal transmission device including a first fiber collimator, a second fiber collimator, a first beam splitter, a first filter unit, a second filter unit, and a third fiber collimator. The first fiber collimator is configured to input a first combined optical signal. The first combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength and an optical signal of a second wavelength. The first beam splitter is configured to split the first combined optical signal from the first fiber collimator into an optical signal of the first wavelength and an optical signal of the second wavelength. The first beam splitter is further configured to transmit the optical signal of the first wavelength to the first filter unit, and the first filter unit is configured to transmit the optical signal of the first wavelength to the third fiber collimator. The first beam splitter is further configured to transmit the optical signal of the second wavelength through the first filter unit and the second filter unit to a third fiber collimator. The second fiber collimator is configured to input the optical signal of the third wavelength. The second filter unit is configured to transmit the optical signal of the third wavelength from the second fiber collimator to the third fiber collimator. The third fiber collimator is configured to output a second combined optical signal. The second combined optical signal is an optical signal obtained by combining the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength.

[0006] The first fiber collimator configured to input the first combined optical signal is equivalent to the first fiber collimator sending the first combined optical signal to a first beam splitter described in the following embodiment. The second fiber collimator configured to input the optical signal of a third wavelength is equivalent to the second fiber collimator sending the optical signal of the third wavelength to a second filter unit described in the following embodiment.

[0007] Based on the above optical signal transmission device, the optical signal transmission device includes a first beam splitter corresponding to the first fiber collimator. When the optical signal input by the first fiber collimator is an optical signal obtained by combining an optical signal of a first wavelength and an optical signal of a second wavelength, the first beam splitter is configured to split the first combined optical signal input by the first fiber collimator into an optical signal of the first wavelength and an optical signal of the second wavelength. Therefore, the optical signal transmission device can multiplex the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of a third wavelength input by the second fiber collimator.

[0008]

[0013] Related to the first aspect, in some implementations of the first aspect, the first beam splitter is a light sheet device made of glass, silicon, or plastic.

[0009] Based on the above technical solution, the first beam splitter is an optical sheet device made of glass, silicon, or plastic, which has a simple structure and small volume, and therefore does not increase the manufacturing complexity of the optical signal transmission device.

[0010] In relation to the first aspect, in some implementations of the first aspect, the first filter unit includes a first reflector and / or a first filter.

[0011] In relation to the first aspect, in some implementations of the first aspect, the second filter unit includes a second reflector and / or a second filter.

[0012] In relation to the first aspect, in some implementations of the first aspect, the third fiber collimator is further configured to input a third combined optical signal. The third combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, and an optical signal of a third wavelength. The first filter unit is further configured to split the third combined optical signal from the third fiber collimator into an optical signal of the first wavelength and a fourth combined optical signal and transmit the optical signal of the first wavelength to the first beam splitter. The fourth combined optical signal is an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of a third wavelength. The first filter unit is further configured to transmit the fourth combined optical signal to the second filter unit. The second filter unit is further configured to split the fourth combined optical signal to obtain an optical signal of a third wavelength and transmit the optical signal of the third wavelength to the second fiber collimator. The second filter unit is further configured to transmit the optical signal of the second wavelength to the first beam splitter. The first beam splitter is configured to transmit the fifth combined optical signal to the first fiber collimator. The fifth combined optical signal is an optical signal obtained by combining the optical signal of the first wavelength and the optical signal of the second wavelength. The first fiber collimator is further configured to output the fifth combined optical signal. The second fiber collimator is further configured to output the optical signal of the third wavelength.

[0013] The third fiber collimator being configured to input the third combined optical signal is equivalent to the third fiber collimator sending the third combined optical signal to the first filter unit described in the following embodiment.

[0014] Based on the above optical signal transmission device, the first beam splitter may obtain a fifth combined optical signal based on the optical signal of the first wavelength and the optical signal of the second wavelength, and transmit the fifth combined optical signal to the first fiber collimator for output, so that the optical signal transmission device can output a plurality of split optical signals of different wavelengths through the first fiber collimator.

[0015] In relation to the first aspect, in some implementations of the first aspect, the optical signal transmission device further includes a second beam splitter and a third filter unit. The third fiber collimator is further configured to input a third combined optical signal. The third combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, an optical signal of a third wavelength, and an optical signal of a fourth wavelength. The first filter unit is further configured to split the third combined optical signal from the third fiber collimator into an optical signal of the first wavelength and a fourth combined optical signal and transmit the optical signal of the first wavelength to the first beam splitter. The fourth combined optical signal is an optical signal obtained by combining the optical signal of the second wavelength, the optical signal of the third wavelength, and the optical signal of the fourth wavelength. The first filter unit is further configured to transmit the fourth combined optical signal to the second filter unit. The second filter unit is further configured to split the fourth combined optical signal to obtain an optical signal of a third wavelength and a sixth combined optical signal, and transmit the optical signal of the third wavelength to the second beam splitter. The sixth combined optical signal is an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of the fourth wavelength. The second filter unit is further configured to transmit the sixth combined optical signal to the third filter unit. The third filter unit is configured to split the sixth combined optical signal to obtain an optical signal of a fourth wavelength, and transmit the optical signal of the fourth wavelength to the second fiber collimator. The third filter unit is further configured to transmit the optical signal of the second wavelength to the first beam splitter. The first beam splitter is configured to transmit the fifth combined optical signal to the first fiber collimator. The fifth combined optical signal is an optical signal obtained by combining the optical signal of the first wavelength and the optical signal of the second wavelength, and the first fiber collimator is further configured to output the fifth combined optical signal.The second beam splitter is configured to transmit the seventh combined optical signal to the second fiber collimator, the seventh combined optical signal being an optical signal obtained by combining the optical signal of the third wavelength and the optical signal of the fourth wavelength, and the second fiber collimator is further configured to output the seventh combined optical signal.

[0016] Based on the above optical signal transmission device, the second beam splitter may obtain a seventh combined optical signal based on the optical signal of the third wavelength and the optical signal of the fourth wavelength, and transmit the seventh combined optical signal to the second fiber collimator for output, so that the optical signal transmission device can output multiple split optical signals of different wavelengths through the second fiber collimator.

[0017] In some implementations of the first aspect, related to the first aspect, the second beam splitter is an optical thin plate made of glass, silicon, or plastic.

[0018] Based on the above technical solution, the second beam splitter is an optical sheet device made of glass, silicon, or plastic, which has a simple structure and small volume, and therefore does not increase the manufacturing complexity of the optical signal transmission device.

[0019] In relation to the first aspect, in some implementations of the first aspect, the second fiber collimator is configured to input an eighth combined optical signal. The eighth combined optical signal is an optical signal obtained by combining an optical signal of a third wavelength and an optical signal of a fourth wavelength. The optical signal transmission device further includes a second beam splitter and a third filter unit. The second beam splitter is configured to split the eighth combined optical signal to obtain an optical signal of the third wavelength and an optical signal of the fourth wavelength. The second beam splitter is further configured to transmit the optical signal of the third wavelength to the second filter unit. The second beam splitter is further configured to transmit the optical signal of the fourth wavelength to the third filter unit. The third filter unit is further configured to transmit the optical signal of the fourth wavelength to the third fiber collimator. The third fiber collimator is configured to output the second combined optical signal. The second combined optical signal is an optical signal obtained through combining the optical signal of the first wavelength, the optical signal of the second wavelength, the optical signal of the third wavelength, and the optical signal of the fourth wavelength.

[0020] Configuring the second fiber collimator to input the eighth combined optical signal is equivalent to the second fiber collimator sending the eighth combined optical signal to a second beam splitter described in the following embodiment.

[0021] Based on the above optical signal transmission device, the optical signal transmission device includes a second beam splitter corresponding to the second fiber collimator. The second beam splitter is configured to split the eighth combined optical signal input by the second fiber collimator to obtain an optical signal of a third wavelength and an optical signal of a fourth wavelength. Therefore, the optical signal transmission device can multiplex an optical signal of the first wavelength, an optical signal of the second wavelength, an optical signal of the third wavelength, and an optical signal of the fourth wavelength. In relation to the first aspect, in some implementations of the first aspect, the third filter unit includes a third reflector and / or a third filter.

[0022] In relation to the first aspect, in some implementations of the first aspect, the wavelength of the optical signal of the third wavelength is greater than the wavelength of the optical signal of the first wavelength, and the wavelength of the optical signal of the third wavelength is less than the wavelength of the optical signal of the second wavelength.

[0023] Based on the above technical solution, when the wavelength of the optical signal with the third wavelength is greater than that of the optical signal with the first wavelength and greater than that of the optical signal with the second wavelength, existing optical devices cannot reflect the optical signal with the third wavelength when transmitting the first combined optical signal, or cannot reflect the first combined optical signal when transmitting the optical signal with the third wavelength. Therefore, if the first combined optical signal is not split into an optical signal with the first wavelength and an optical signal with the second wavelength, the first combined optical signal and the third optical signal cannot be multiplexed. Therefore, after the first beam splitter splits the first combined optical signal into an optical signal with the first wavelength and an optical signal with the second wavelength, the optical signal with the first wavelength, the optical signal with the second wavelength, and the optical signal with the third wavelength can be easily multiplexed.

[0024] In relation to the first aspect, in some implementations of the first aspect, the optical signal transmitted in the optical signal transmission device is spatial light.

[0025] Based on the above optical signal transmission device, the optical signal transmitted in the optical signal transmission device is spatial light rather than an optical signal transmitted through an optical fiber, so that optical fiber resources can be saved and the optical signal transmission device is easy to manufacture.

[0026] According to a second aspect, there is provided an optical transmission system including a first optical module, a second optical module, and an optical signal transmission device. The optical signal transmission device includes a first fiber collimator, a second fiber collimator, a first beam splitter, a first filter unit, a second filter unit, and a third fiber collimator. The first optical module is configured to send a first combined optical signal to the first fiber collimator. The first combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength and an optical signal of a second wavelength. The first fiber collimator is configured to send the first combined optical signal to the first beam splitter. The first beam splitter is configured to split the first combined optical signal from the first fiber collimator into an optical signal of the first wavelength and an optical signal of the second wavelength. The first beam splitter is further configured to transmit the optical signal of the first wavelength to the first filter unit, and the first filter unit is configured to transmit the optical signal of the first wavelength to the third fiber collimator. The first beam splitter is further configured to transmit the optical signal of the second wavelength through the first filter unit and the second filter unit to the third fiber collimator. The second optical module is configured to send the optical signal of the third wavelength to the second fiber collimator. The second filter unit is configured to transmit the optical signal of the third wavelength from the second fiber collimator to the third fiber collimator. The third fiber collimator is configured to output a second combined optical signal. The second combined optical signal is an optical signal obtained by combining the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength.

[0027] Based on the above optical transmission system, the optical signal transmission device includes a first beam splitter. When the optical signal sent by the first optical module to the first fiber collimator is an optical signal obtained by combining an optical signal of a first wavelength and an optical signal of a second wavelength, the first beam splitter may split the first combined optical signal received from the first fiber collimator into an optical signal of the first wavelength and an optical signal of the second wavelength. Thus, the optical signal transmission device can multiplex the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of a third wavelength input by the second fiber collimator. Therefore, in the above optical transmission system, the first optical module configured to send the first combined optical signal may be connected to the optical signal transmission device through a single optical fiber, thereby saving optical fiber resources and reducing installation difficulties.

[0028]

[0013] Related to the second aspect, in some implementations of the second aspect, the first beam splitter is a light sheet device made of glass, silicon, or plastic.

[0029] Based on the above technical solution, the first beam splitter is an optical sheet device made of glass, silicon, or plastic, which has a simple structure and small volume, and therefore does not increase the manufacturing complexity of the optical signal transmission device.

[0030] In relation to the second aspect, in some implementations of the second aspect, the first filter unit includes a first reflector and / or a first filter.

[0031] In relation to the second aspect, in some implementations of the second aspect, the second filter unit includes a second reflector and / or a second filter.

[0032] In relation to the second aspect, in some implementations of the second aspect, the third fiber collimator is further configured to input a third combined optical signal. The third combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, and an optical signal of a third wavelength. The first filter unit is further configured to split the third combined optical signal from the third fiber collimator into an optical signal of the first wavelength and a fourth combined optical signal and transmit the optical signal of the first wavelength to the first beam splitter. The fourth combined optical signal is an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of a third wavelength. The first filter unit is further configured to transmit the fourth combined optical signal to the second filter unit. The second filter unit is further configured to split the fourth combined optical signal to obtain an optical signal of a third wavelength and transmit the optical signal of the third wavelength to the second fiber collimator. The second filter unit is further configured to transmit the optical signal of the second wavelength to the first beam splitter. The first beam splitter is configured to transmit the fifth combined optical signal to the first fiber collimator. The fifth combined optical signal is an optical signal obtained by combining the optical signal of the first wavelength and the optical signal of the second wavelength. The first optical module is further configured to receive the fifth combined optical signal from the first fiber collimator. The second optical module is further configured to receive the optical signal of the third wavelength from the second fiber collimator.

[0033] In the optical transmission system, the first beam splitter included in the optical signal transmission device can obtain a fifth combined optical signal based on the optical signal of the first wavelength and the optical signal of the second wavelength, and transmit the fifth combined optical signal to the first fiber collimator, so that the optical signal transmission device can transmit multiple split optical signals of different wavelengths through the first fiber collimator. Therefore, in the optical transmission system, the first optical module configured to receive the fifth combined optical signal can be connected to the optical signal transmission device through one optical fiber, thereby saving optical fiber resources and reducing installation difficulties.

[0034] In relation to the second aspect, in some implementations of the second aspect, the optical signal transmission device further includes a second beam splitter and a third filter unit. The third fiber collimator is further configured to input a third combined optical signal. The third combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, an optical signal of a third wavelength, and an optical signal of a fourth wavelength. The first filter unit is further configured to split the third combined optical signal from the third fiber collimator into an optical signal of the first wavelength and a fourth combined optical signal and transmit the optical signal of the first wavelength to the first beam splitter. The fourth combined optical signal is an optical signal obtained by combining the optical signal of the second wavelength, the optical signal of the third wavelength, and the optical signal of the fourth wavelength. The first filter unit is further configured to transmit the fourth combined optical signal to the second filter unit. The second filter unit is further configured to split the fourth combined optical signal to obtain an optical signal of a third wavelength and a sixth combined optical signal. The sixth combined optical signal is an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of the fourth wavelength. The second filter unit is further configured to transmit the sixth combined optical signal to the third filter unit. The third filter unit is configured to split the sixth combined optical signal to obtain an optical signal of a fourth wavelength and transmit the optical signal of the fourth wavelength to the second fiber collimator. The third filter unit is further configured to transmit the optical signal of the second wavelength to the first beam splitter. The first beam splitter is configured to transmit the fifth combined optical signal to the first fiber collimator. The fifth combined optical signal is an optical signal obtained by combining the optical signal of the first wavelength and the optical signal of the second wavelength. The first optical module is further configured to receive the fifth combined optical signal from the first fiber collimator. The second beam splitter is configured to transmit the seventh combined optical signal to the second fiber collimator.The seventh combined optical signal is an optical signal obtained by combining the optical signal of the third wavelength and the optical signal of the fourth wavelength. The second optical module is further configured to receive the seventh combined optical signal from the second fiber collimator.

[0035] In the optical transmission system, the second beam splitter included in the optical signal transmission device may obtain a seventh combined optical signal based on the optical signal of the third wavelength and the optical signal of the fourth wavelength, and transmit the seventh combined optical signal to the second fiber collimator, so that the optical signal transmission device can transmit multiple split optical signals of different wavelengths through the second fiber collimator. Therefore, in the optical transmission system, the second optical module configured to receive the seventh combined optical signal may be connected to the optical signal transmission device through a single optical fiber, thereby saving optical fiber resources and reducing installation difficulties.

[0036]

[0013] Related to the second aspect, in some implementations of the second aspect, the second beam splitter is a light sheet device made of glass, silicon, or plastic.

[0037] Based on the above technical solution, the second beam splitter is an optical sheet device made of glass, silicon, or plastic, which has a simple structure and small volume, and therefore does not increase the manufacturing complexity of the optical signal transmission device.

[0038] In relation to the second aspect, in some implementations of the second aspect, the second optical module is configured to send an eighth combined optical signal to the second fiber collimator. The eighth combined optical signal is an optical signal obtained by combining an optical signal of a third wavelength and an optical signal of a fourth wavelength. The optical signal transmission device further includes a second beam splitter and a third filter unit. The second fiber collimator is configured to transmit the eighth combined optical signal to the second beam splitter. The second beam splitter is configured to split the eighth combined optical signal to obtain an optical signal of the third wavelength and an optical signal of the fourth wavelength. The second beam splitter is further configured to transmit the optical signal of the third wavelength to the second filter unit. The second beam splitter is further configured to transmit the optical signal of the fourth wavelength to the third filter unit. The third filter unit is further configured to transmit the optical signal of the fourth wavelength to a third fiber collimator, and the third fiber collimator is configured to output a second combined optical signal, the second combined optical signal being an optical signal obtained by combining the optical signal of the first wavelength, the optical signal of the second wavelength, the optical signal of the third wavelength, and the optical signal of the fourth wavelength.

[0039] Based on the above optical transmission system, the optical signal transmission device includes a second beam splitter. The second beam splitter may split the eighth combined optical signal received from the second fiber collimator into an optical signal of a third wavelength and an optical signal of a fourth wavelength. Thus, the optical signal transmission device can multiplex the optical signal of the first wavelength, the optical signal of the second wavelength, the optical signal of the third wavelength, and the optical signal of the fourth wavelength. Therefore, in the above optical transmission system, the second optical module configured to send the eighth combined optical signal may be connected to the optical signal transmission device through a single optical fiber, thereby saving optical fiber resources and reducing installation difficulties.

[0040] In relation to the second aspect, in some implementations of the second aspect, the third filter unit includes a third reflector and / or a third filter.

[0041] In relation to the second aspect, in some implementations of the second aspect, the wavelength of the optical signal of the third wavelength is greater than the wavelength of the optical signal of the first wavelength, and the wavelength of the optical signal of the third wavelength is less than the wavelength of the optical signal of the second wavelength.

[0042] Based on the above technical solution, when the wavelength of the optical signal with the third wavelength is greater than that of the optical signal with the first wavelength and greater than that of the optical signal with the second wavelength, existing optical devices cannot reflect the optical signal with the third wavelength when transmitting the first combined optical signal, or cannot reflect the first combined optical signal when transmitting the optical signal with the third wavelength. Therefore, if the first combined optical signal is not split into an optical signal with the first wavelength and an optical signal with the second wavelength, the first combined optical signal and the third optical signal cannot be multiplexed. Therefore, after the first beam splitter splits the first combined optical signal into an optical signal with the first wavelength and an optical signal with the second wavelength, the optical signal with the first wavelength, the optical signal with the second wavelength, and the optical signal with the third wavelength can be easily multiplexed.

[0043] In relation to the second aspect, in some implementations of the second aspect, the optical signal transmitted in the optical signal transmission device is spatial light.

[0044] Based on the above optical transmission system, the optical signal transmitted within the optical signal device is spatial light rather than an optical signal transmitted through an optical fiber, which can save optical fiber resources and makes the optical signal transmission device easier to manufacture. [Brief explanation of the drawings]

[0045] [Figure 1] FIG. 2 is a schematic diagram of the multiplexing and demultiplexing performed by a multiplexer / demultiplexer.

[0046] [Figure 2] 1 is a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application;

[0047] [Figure 3] 1 is a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application;

[0048] [Figure 4] 1 is a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application;

[0049] [Figure 5] 1 is a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application;

[0050] [Figure 6] 1 is a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application;

[0051] [Figure 7] 1 is a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application;

[0052] [Figure 8] 1 is a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application;

[0053] [Figure 9] 1 is a schematic diagram of an optical transmission system according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0054] The following describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings.

[0055] In the description of this application, unless otherwise specified, " / " represents an "or" relationship between associated objects. For example, A / B can represent A or B. In the description of this application, "and / or" is simply an association relationship to describe associated objects, and indicates that three relationships can exist. For example, A and / or B can represent that only A exists, that both A and B exist, and that only B exists, and A and B can be singular or plural. Also, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0056] In addition, in order to facilitate clear description of the technical solutions in the embodiments of the present application, words such as "first" and "second" are used in the embodiments of the present application to distinguish between the same or similar items. For example, the first combined optical signal and the second combined optical signal in the following embodiments are both optical signals obtained by combining multiple optical signals of different wavelengths. However, the first combined optical signal and the second combined optical signal are optical signals obtained by combining optical signals of different wavelengths. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity or execution order, and terms such as "first" and "second" do not indicate a clear distinction.

[0057] In the embodiments of the present application, numbers such as "#1" and "#2" are further used to distinguish between the same or similar items. For example, in the following embodiments, the combined optical signal #1 and the combined optical signal #2 both include multiple optical signals with different wavelengths. However, the combined optical signal #1 and the combined optical signal #2 are optical signals with different transmission directions. Those skilled in the art can understand that the words "#1" and "#2" do not limit the quantity and execution order.

[0058] Additionally, in the embodiments of the present application, terms such as "example" or "for example" are used to indicate providing an example, illustration, or explanation. Any embodiment or design solution described in the embodiments of the present application as an "example" or "for example" should not be construed as preferred or advantageous over another embodiment or design solution. Specifically, the use of the terms "example" or "for example" is intended to specifically present related concepts for ease of understanding.

[0059] A multiplexer / demultiplexer is a key component in optical communication systems. As shown in FIG. 1, when a multiplexer / demultiplexer is configured to implement a multiplexing function, the multiplexer / demultiplexer combines five optical signals of different wavelengths (i.e., optical signals with wavelengths λ1, λ2, λ3, λ4, and λ5, respectively) received through five optical fibers into one channel of an optical signal and outputs that channel of the optical signal through one optical fiber. When a multiplexer / demultiplexer is configured to implement a demultiplexing function, the multiplexer / demultiplexer splits a combined optical signal (i.e., an optical signal obtained by combining optical signals with wavelengths λ1, λ2, λ3, λ4, and λ5, respectively) received through one optical fiber based on wavelength and outputs the split optical signals through multiple optical fibers. However, when the multiplexer / demultiplexer shown in FIG. 1 is configured to implement a multiplexing function, if an optical signal input through at least one of the multiple optical fibers is a combined optical signal containing multiple different wavelengths, the multiplexer / demultiplexer cannot multiplex the combined optical signal with an optical signal input through another optical fiber. For example, when the multiplexer / demultiplexer receives two optical signals through two optical fibers, one optical signal (referred to as optical signal #1) is an optical signal obtained by combining an optical signal with a wavelength λ1 and an optical signal with a wavelength λ2, and the other optical signal (referred to as optical signal #2) is an optical signal with a wavelength λ3. Furthermore, the magnitude relationship among λ1, λ2, and λ3 is: λ1<λ3<λ2 or λ1>λ3>λ2. Existing optical devices have difficulty reflecting optical signal #2 while transmitting optical signal #1, or difficulty transmitting optical signal #2 while reflecting optical signal #1, so multiplexers / demultiplexers cannot combine optical signal #1 and optical signal #2 into one channel of an optical signal.When the multiplexer / demultiplexer shown in FIG. 1 is configured to implement a demultiplexing function, the multiplexer / demultiplexer cannot output multiple split optical signals of different wavelengths through a single optical fiber.

[0060] In view of this, an embodiment of the present application provides an optical signal transmission device, which can multiplex the optical signals and / or output multiple split optical signals of different wavelengths through a single optical fiber, even when the optical signals received by the optical signal transmission device include at least one combined optical signal.

[0061] FIG. 2 shows a schematic diagram of the structure of an optical signal transmission device according to an embodiment of the present application. The optical signal transmission device provided in this embodiment of the present application includes a first fiber collimator. The first fiber collimator inputs a first combined optical signal and sends the first combined optical signal to a first beam splitter. The first combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength and an optical signal of a second wavelength. The first wavelength is different from the second wavelength. For example, fiber collimator 210 (an example of a first fiber collimator) included in optical signal transmission device 200 shown in FIG. 2 is configured to send the first combined optical signal to beam splitter 241 (an example of a first beam splitter). The first combined optical signal is an optical signal obtained by combining an optical signal of wavelength λ1 (an example of an optical signal of a first wavelength) and an optical signal of wavelength λ2 (an example of an optical signal of a second wavelength). λ1 is not equal to λ2.

[0062] Optionally, the first fiber collimator may further transmit the optical signal at the first wavelength or the optical signal at the second wavelength to a first beam splitter.

[0063] Optionally, the first fiber collimator may further send to the first beam splitter an optical signal obtained by combining optical signals of more than two different wavelengths. For example, the first combined optical signal sent to the first beam splitter by the first fiber collimator is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, and an optical signal of a fifth wavelength, where the fifth wavelength is different from the first wavelength and the second wavelength.

[0064] The optical signal transmission device provided in this embodiment of the present application further includes a second fiber collimator. The second fiber collimator receives an optical signal of a third wavelength and sends the optical signal of the third wavelength to the second filter unit. For example, fiber collimator 220 (an example of a second fiber collimator) included in the optical signal transmission device shown in FIG. 2 is configured to send an optical signal of wavelength λ3 (an example of an optical signal of the third wavelength) to filter unit 252 (an example of a second filter unit).

[0065] Optionally, the second fiber collimator receives the eighth combined optical signal and sends the eighth combined optical signal to the second beam splitter. The eighth combined optical signal is obtained by combining an optical signal with a third wavelength and an optical signal with a fourth wavelength. The third wavelength is different from the fourth wavelength. For example, the fiber collimator 260 (another example of a second fiber collimator) included in the optical signal transmission device 200 shown in FIG. 3 is configured to transmit the eighth combined optical signal to the beam splitter 242 (an example of a second beam splitter). The eighth combined optical signal is obtained by combining an optical signal with a wavelength λ3 and an optical signal with a wavelength λ4 (an example of an optical signal with a fourth wavelength). λ3 is not equal to λ4.

[0066] Optionally, the second fiber collimator may further transmit the optical signal at the fourth wavelength to a second beam splitter.

[0067] Optionally, the second fiber collimator may further send the optical signal obtained through combining the optical signals of more than two different wavelengths to a second beam splitter.

[0068] It should also be noted that the optical signals included in the combined optical signal input by the first fiber collimator and the optical signals included in the combined optical signal input by the second fiber collimator have different wavelengths. That is, the first wavelength and the second wavelength are different from the third wavelength. When the second fiber collimator inputs the eighth combined optical signal, the first wavelength and the second wavelength are different from the fourth wavelength.

[0069] Optionally, the wavelengths of the optical signals transmitted by the first fiber collimator and the second fiber collimator have the following relationship: the third wavelength is greater than the first wavelength, and the third wavelength is less than the second wavelength.

[0070] Optionally, the wavelengths of the optical signals transmitted by the first fiber collimator and the second fiber collimator have the following relationship: the third wavelength is greater than the second wavelength, and the third wavelength is less than the first wavelength.

[0071] It should be noted that the magnitude relationship between the fourth wavelength and the wavelength of the optical signal transmitted by the first fiber collimator is not limited in the present embodiment, for example, the fourth wavelength may be greater than or less than the first wavelength.

[0072] The optical signal transmission device provided in this embodiment of the present application further includes a first beam splitter, a first filter unit, a second filter unit, and a third fiber collimator.

[0073] The first beam splitter is an optical sheet device that may be made of glass, silicon, or plastic. The first beam splitter corresponds to the first fiber collimator. The first beam splitter is further configured to receive the first combined optical signal from the first fiber collimator and split the first combined optical signal to obtain an optical signal of a first wavelength and an optical signal of a second wavelength. The first beam splitter splits the first combined optical signal to obtain an optical signal of a first wavelength and an optical signal of a second wavelength, meaning that the first beam splitter splits the first combined optical signal into two channels of optical signals. One optical signal is an optical signal of the first wavelength. The other optical signal is an optical signal of the second wavelength. In other words, the first beam splitter is configured to separate the optical signal of the first wavelength and the optical signal of the second wavelength from the first combined optical signal. When the first combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, and an optical signal of a fifth wavelength, the first beam splitter is configured to split the first combined optical signal to obtain the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the fifth wavelength.

[0074] Furthermore, the first beam splitter is further configured to transmit the optical signal of the first wavelength to the first filter unit, and the first beam splitter is further configured to transmit the optical signal of the second wavelength to the second filter unit. After receiving the optical signal of the first wavelength from the first beam splitter, the first filter unit is configured to transmit the optical signal of the first wavelength to the third fiber collimator. After receiving the optical signal of the second wavelength from the first beam splitter, the second filter unit transmits the optical signal of the second wavelength to the first filter unit, and then the first filter unit transmits the optical signal of the second wavelength to the third fiber collimator.

[0075] 2, after receiving a first combined optical signal from fiber collimator 210, beam splitter 241 splits the first combined optical signal to obtain an optical signal with wavelength λ1 and an optical signal with wavelength λ2. Then, beam splitter 241 transmits the optical signal with wavelength λ1 to filter unit 251 (an example of a first filter unit) and transmits the optical signal with wavelength λ2 to filter unit 252 (an example of a second filter unit). After receiving the optical signal with wavelength λ1 from beam splitter 241, filter unit 251 transmits the optical signal with wavelength λ1 to fiber collimator 230 (an example of a third fiber collimator). After receiving the optical signal with wavelength λ2 from the beam splitter 241, the filter unit 252 transmits the optical signal with wavelength λ2 to the filter unit 251, and the filter unit 251 transmits the optical signal with wavelength λ2 to the fiber collimator 230.

[0076] The first filter unit corresponds to an optical signal of a first wavelength. In other words, the first filter unit can split and / or reflect an optical signal of the first wavelength. When the first filter unit receives an optical signal of another wavelength, the first filter unit transmits the optical signal of the other wavelength.

[0077] The second filter unit corresponds to an optical signal of a third wavelength. In other words, the second filter unit can split and / or reflect the optical signal of the third wavelength. When the second filter unit receives an optical signal of another wavelength, the second filter unit transmits the optical signal of the other wavelength. After receiving the optical signal of the third wavelength, the second filter unit is configured to transmit the optical signal of the third wavelength to the first filter unit, which is further configured to transmit the optical signal of the third wavelength to the third fiber collimator. For example, after receiving an optical signal of wavelength λ3, the filter unit 252 shown in FIG. 2 is configured to transmit the optical signal of wavelength λ3 to the filter unit 251, which then transmits the optical signal of wavelength λ3 to the fiber collimator 230.

[0078] Optionally, if the optical signal transmission device includes a fourth filter unit, the first beam splitter is configured to transmit the optical signal of the second wavelength to the fourth filter unit. Furthermore, the fourth filter unit is configured to transmit the optical signal of the second wavelength to the third fiber collimator. For example, the filter unit 352 included in the optical signal transmission device 200 shown in FIG. 4 is an example of a fourth filter unit. After splitting the first combined optical signal to obtain an optical signal having wavelength λ2, the beam splitter 241 transmits the optical signal having wavelength λ2 to the filter unit 352. After receiving the optical signal of wavelength λ2 from the beam splitter 241, the filter unit 352 is configured to transmit the optical signal of wavelength λ2 to the fiber collimator 230.

[0079] The specific structure of the filter unit is not limited to the embodiments of the present application.

[0080] For example, the first filter unit may include a first reflector and / or a first filter. The first reflector is configured to reflect an optical signal of a first wavelength, and the first filter is configured to reflect an optical signal of a first wavelength, and the first filter is configured to transmit another optical signal. For example, the filter unit 251 shown in FIG. 2 includes a reflector 2511 (an example of a first reflector) and a filter 2512 (an example of a first filter). The reflector 2511 is configured to transmit an optical signal of wavelength λ1 to the filter 2512. The filter 2512 transmits the optical signal of wavelength λ1 to the fiber collimator 230. 4 includes a reflector 3511 (another example of a first reflector), a reflector 3512 (another example of a first reflector), and a filter 3513 (another example of a first filter). The reflector 3511 is configured to transmit an optical signal having a wavelength λ1 to the reflector 3512, which then transmits the optical signal having the wavelength λ1 to the filter 3513. The filter 3513 then transmits the optical signal having the wavelength λ1 to the fiber collimator 230.

[0081] For example, the second filter unit may include a second reflector and / or a second filter. The second reflector is configured to reflect an optical signal of a third wavelength, the second filter is configured to reflect an optical signal of the third wavelength, and the second filter is configured to transmit another optical signal. For example, filter unit 252 shown in FIG. 2 includes reflector 2521 (an example of a second reflector) and filter 2522 (an example of a second filter). Reflector 2521 is configured to transmit an optical signal of wavelength λ3 to filter 2522. Filter 2522 transmits the optical signal of wavelength λ3 to filter unit 251. As another example, filter unit 353 (another example of a second filter unit) shown in FIG. 4 includes filter 3531 (another example of a second filter). Filter 3531 transmits an optical signal of wavelength λ3 to filter unit 351.

[0082] Optionally, when the second fiber collimator is configured to input the eighth combined optical signal, the optical signal transmission device provided in this embodiment of the present application further includes a second beam splitter and a third filter unit.

[0083] The second beam splitter is an optical sheet device that may be made of glass, silicon, or plastic. The second beam splitter corresponds to the second fiber collimator. The second beam splitter is configured to receive the eighth combined optical signal from the second fiber collimator. The second beam splitter is further configured to split the eighth combined optical signal to obtain an optical signal of a third wavelength and an optical signal of a fourth wavelength. The second beam splitter splits the eighth combined optical signal to obtain an optical signal of a third wavelength and an optical signal of a fourth wavelength. This means that the second beam splitter splits the eighth combined optical signal into two channels of optical signals. One optical signal is an optical signal of the third wavelength. The other optical signal is an optical signal of the fourth wavelength. In other words, the second beam splitter is configured to separate the optical signal of the third wavelength and the optical signal of the fourth wavelength from the eighth combined optical signal.

[0084] Furthermore, the second beam splitter is further configured to transmit the optical signal of the third wavelength to the second filter unit, and the second beam splitter is further configured to transmit the optical signal of the fourth wavelength to the third filter unit. The third filter unit corresponds to the optical signal of the fourth wavelength. In other words, the third filter unit can split and / or reflect the optical signal of the fourth wavelength. When the third filter unit receives an optical signal of another wavelength, the third filter unit transmits the optical signal of the other wavelength.

[0085] 3 splits the eighth combined optical signal to obtain an optical signal having a wavelength λ3 and an optical signal having a wavelength λ4. Then, the beam splitter 242 transmits the optical signal having the wavelength λ3 to the filter unit 252, and transmits the optical signal having the wavelength λ4 to the filter unit 253. Furthermore, the filter unit 252 is configured to transmit the optical signal having the wavelength λ3 to the filter unit 251, and then the filter unit 251 transmits the optical signal having the wavelength λ3 to the fiber collimator 230. The filter unit 253 is configured to transmit the optical signal having the wavelength λ4 to the filter unit 252, which then transmits the optical signal having the wavelength λ4 to the filter unit 251, which then transmits the optical signal having the wavelength λ4 to the fiber collimator 230.

[0086] For example, the third filter unit may include a third reflector and / or a third filter. The third reflector is configured to reflect an optical signal of a fourth wavelength, the third filter is configured to reflect an optical signal of the fourth wavelength, and the third filter is configured to transmit another optical signal. For example, the filter unit 253 shown in FIG. 3 includes a reflector 2531 (an example of a third reflector) and a filter 2532 (an example of a third filter). The reflector 2531 is configured to transmit an optical signal of wavelength λ4 to the filter 2532. The filter 2532 is configured to transmit the optical signal of λ4 to the filter unit 252.

[0087] As described above, the optical signal transmission device provided in this embodiment of the present application further includes a third fiber collimator. The third fiber collimator is configured to output a second combined optical signal. The second combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, and an optical signal of a third wavelength. For example, the fiber collimator 230 shown in FIG. 2 is configured to output a second combined optical signal. The second combined optical signal is an optical signal obtained by combining an optical signal of a wavelength λ1, an optical signal of a wavelength λ2, and an optical signal of a wavelength λ3.

[0088] For example, an optical signal of a first wavelength, an optical signal of a second wavelength, and an optical signal of a third wavelength are combined into a second combined optical signal before reaching the third fiber collimator. As shown in FIG. 2, an optical signal of a wavelength λ1, an optical signal of a wavelength λ2, and an optical signal of a wavelength λ3 are combined into a second combined optical signal before reaching the fiber collimator 230. For example, a filter 2512 and a filter 2522 are disposed in the transmission path of the optical signal of wavelength λ2. After passing through the filter 2522, the optical signal of wavelength λ2 is first combined with the optical signal of wavelength λ3 transmitted by the filter 2522 to the fiber collimator 230 to form one channel of light. Furthermore, after the optical signals of wavelengths λ2 and λ3 are combined into one channel of light to pass through the filter 2512, the optical channel is combined with the optical signal of wavelength λ1 transmitted by the filter 2512 to the fiber collimator 230 to form a second combined optical signal.

[0089] Optionally, when the second fiber collimator is configured to input an eighth combined optical signal, the second combined optical signal is an optical signal obtained by combining an optical signal of the first wavelength, an optical signal of the second wavelength, an optical signal of the third wavelength, and an optical signal of the fourth wavelength.

[0090] The optical signals transmitted in an optical signal transmission device are spatial light. The optical signals transmitted in an optical signal transmission device are optical signals transmitted between devices included in the optical signal transmission device. For example, the first combined optical signal transmitted by the first fiber collimator to the first beam splitter is spatial light, the optical signal of a first wavelength transmitted by the first beam splitter to the first filter unit is also spatial light, and the optical signal of a second wavelength transmitted by the first beam splitter to the third fiber collimator is also spatial light. Spatial light is an optical signal that propagates through air.

[0091] It should be noted that the optical signals transmitted by the first fiber collimator, the second fiber collimator, and the third fiber collimator are all collimated.

[0092] The optical signal transmission device provided in this embodiment of the present application includes a first beam splitter corresponding to a first fiber collimator. The first beam splitter is configured to split a first combined optical signal received from the first fiber collimator into an optical signal of a first wavelength and an optical signal of a second wavelength. Therefore, the optical signal transmission device can multiplex the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of a third wavelength received from the second fiber collimator. If the wavelength of the optical signal of the third wavelength is greater than that of the optical signal of the first wavelength, and if the wavelength of the optical signal of the third wavelength is greater than that of the optical signal of the second wavelength, existing optical devices cannot reflect the optical signal of the third wavelength while transmitting the first combined optical signal, or cannot reflect the first combined optical signal while transmitting the optical signal of the third wavelength. Therefore, if the first combined optical signal is not split into the optical signal of the first wavelength and the optical signal of the second wavelength, the first combined optical signal and the third optical signal cannot be multiplexed. Therefore, after the first beam splitter splits the first combined optical signal into an optical signal of a first wavelength and an optical signal of a second wavelength, the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength can be easily multiplexed.

[0093] The first beam splitter is an optical sheet device made of glass, silicon, or plastic. The first beam splitter has a simple structure and a small volume. Furthermore, optical signals are transmitted between devices included in the optical signal transmission device through space rather than through optical fibers. This saves optical fiber resources and makes the optical signal transmission device easy to manufacture.

[0094] Optionally, the optical signal transmission device provided in this embodiment of the present application may further implement a multiplexing / demultiplexing function. With reference to FIGS. 5 and 6, the following describes how the optical signal transmission device provided in the embodiment of the present application implements the multiplexing / demultiplexing function. It should be understood that the optical signal transmission device 200 shown in FIG. 5 has the same structure as the optical signal transmission device 200 shown in FIG. 2. However, FIG. 5 illustrates different functions of the optical signal transmission device 200. Furthermore, the optical signal transmission device 200 shown in FIG. 6 has the same structure as the optical signal transmission device 200 shown in FIG. 3. However, FIG. 6 illustrates different functions of the optical signal transmission device 200.

[0095] The third fiber collimator included in the optical signal transmission device further inputs the third combined optical signal and transmits the third combined optical signal to the first filter unit. The third combined optical signal is an optical signal obtained by combining an optical signal of a first wavelength, an optical signal of a second wavelength, and an optical signal of a third wavelength. For example, as shown in FIG. 5 , the fiber collimator 230 is further configured to send the third combined optical signal to the filter unit 251. The third combined optical signal is an optical signal obtained by combining an optical signal of a wavelength λ1, an optical signal of a wavelength λ2, and an optical signal of a wavelength λ3.

[0096] Optionally, the third fiber collimator may also input an optical signal of the first wavelength, an optical signal of the second wavelength, or an optical signal of the third wavelength.

[0097] The first filter unit is further configured to receive a third combined optical signal from the third fiber collimator and to split the third combined optical signal to obtain an optical signal of the first wavelength and a fourth combined optical signal. The fourth combined optical signal is an optical signal obtained by combining an optical signal of the second wavelength and an optical signal of the third wavelength. The first filter unit is configured to split the third combined optical signal to obtain an optical signal of the first wavelength and a fourth combined optical signal, meaning that the first filter unit is configured to split the third combined optical signal into two channels of optical signals. One optical signal is the optical signal of the first wavelength. The other optical signal is the fourth combined optical signal. Alternatively, the first filter unit is configured to select the optical signal of the first wavelength from the third combined optical signal.

[0098] The first filter unit is further configured to transmit the optical signal having the first wavelength to the first beam splitter and to transmit the fourth combined optical signal to the second filter unit. As shown in FIG. 5 , after receiving the third combined optical signal from the fiber collimator 230, the filter unit 251 splits the third combined optical signal to obtain an optical signal having a wavelength of λ1 and a fourth combined optical signal. The fourth combined optical signal is obtained by combining the optical signal having the wavelength λ2 and the optical signal having the wavelength λ3. The filter unit 251 is further configured to transmit the optical signal having the wavelength λ1 to the beam splitter 241 and to transmit the fourth combined optical signal to the filter unit 252.

[0099] 5, filter unit 251 may include a reflector 2511 and a filter 2512. Filter 2512 is configured to split the third combined optical signal to obtain an optical signal having a wavelength of λ1 and transmit the optical signal having the wavelength of λ1 to reflector 2511. Reflector 2511 is configured to transmit the optical signal having wavelength λ1 to beam splitter 241. The fourth combined optical signal passes through filter 2512 and reaches filter unit 252.

[0100] The second filter unit is further configured to split the fourth combined optical signal to obtain an optical signal having a third wavelength and transmit the optical signal having the third wavelength to the second fiber collimator. The second filter unit is further configured to transmit the optical signal having the second wavelength to the first beam splitter. As shown in FIG. 5 , after receiving the fourth combined optical signal from the filter unit 251, the filter unit 252 splits the fourth combined optical signal to obtain an optical signal having a wavelength λ3, transmits the optical signal having the wavelength λ3 to the fiber collimator 220, and further transmits the optical signal having the wavelength λ2 to the beam splitter 241. The second filter unit is configured to split the fourth combined optical signal to obtain an optical signal having a second wavelength and an optical signal having a third wavelength, which means that the second filter unit is configured to split the fourth combined optical signal into two channels of optical signals. One optical signal is the optical signal having the second wavelength. The other optical signal is an optical signal at a third wavelength. Alternatively, the second filter unit is configured to select the optical signal at the third wavelength from the fourth combined optical signal.

[0101] 5 , the filter 2522 included in the filter unit 252 is configured to split the fourth combined optical signal to obtain an optical signal having a wavelength λ3, and transmit the optical signal having the wavelength λ3 to the reflector 2521. The reflector 2521 included in the filter unit 252 transmits the optical signal having the wavelength λ3 to the fiber collimator 220. The optical signal having the wavelength λ3 passes through the filter 2522 and reaches the beam splitter 241.

[0102] The first beam splitter is configured to receive an optical signal of a first wavelength from the first filter unit and to receive an optical signal of a second wavelength from the second filter unit or the third filter unit. The first beam splitter is further configured to transmit a fifth combined optical signal to the first fiber collimator. The fifth combined optical signal is an optical signal obtained by combining the optical signal of the first wavelength and the optical signal of the second wavelength. That is, after receiving the optical signal of the first wavelength and the optical signal of the second wavelength, the first beam splitter combines the optical signal of the first wavelength and the optical signal of the second wavelength into a fifth combined optical signal and transmits the fifth combined optical signal to the first fiber collimator. As shown in FIG. 5, the beam splitter 241 is further configured to receive an optical signal having a wavelength λ1 and an optical signal having a wavelength λ2, and transmit a fifth combined optical signal combined by the optical signal having wavelength λ1 and the optical signal having wavelength λ2 to the fiber collimator 210.

[0103] The first fiber collimator is further configured to output a fifth combined optical signal. The second fiber collimator is further configured to output an optical signal having a third wavelength. As shown in FIG. 5 , fiber collimator 210 is further configured to output the fifth combined optical signal received from beam splitter 241, and fiber collimator 220 is further configured to output an optical signal having a wavelength of λ3.

[0104] Optionally, when the third combined optical signal is an optical signal obtained by combining an optical signal of the first wavelength, an optical signal of the second wavelength, an optical signal of the third wavelength, and an optical signal of the fourth wavelength, the fourth combined optical signal obtained by splitting the third combined optical signal by the first filter unit is an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of the third wavelength. Further, the second filter unit splits the fourth combined optical signal from the first filter unit into a sixth combined optical signal and an optical signal of the third wavelength. The sixth combined optical signal is an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of the fourth wavelength. The second filter unit is further configured to transmit the optical signal of the third wavelength to the second beam splitter and transmit the sixth combined optical signal to the third filter unit. Furthermore, after receiving the sixth combined optical signal from the second filter unit, the third filter unit splits the sixth combined optical signal to obtain an optical signal of a fourth wavelength and transmits the optical signal of the fourth wavelength to the second beam splitter. The third filter unit is further configured to transmit the optical signal of the second wavelength to the first beam splitter. The second beam splitter is configured to receive the optical signal of the third wavelength from the second filter unit and to receive the optical signal of the fourth wavelength from the third filter unit. Furthermore, the second beam splitter is further configured to transmit the seventh combined optical signal to the second fiber collimator. The seventh combined optical signal is an optical signal obtained by combining the optical signal of the third wavelength and the optical signal of the fourth wavelength.

[0105] 6, the third combined optical signal input by the fiber collimator 230 is an optical signal obtained by combining an optical signal having a wavelength λ1, an optical signal having a wavelength λ2, an optical signal having a wavelength λ3, and an optical signal having a wavelength λ4. Furthermore, the fourth combined optical signal obtained by splitting the third combined optical signal by the filter unit 251 is an optical signal obtained by combining the optical signal having a wavelength λ2, the optical signal having a wavelength λ3, and the optical signal having a wavelength λ4. Furthermore, after receiving the fourth combined optical signal from the filter unit 251, the filter unit 252 splits the fourth combined optical signal to obtain an optical signal having a wavelength of λ3 and a sixth combined optical signal. The sixth combined optical signal is an optical signal obtained by combining the optical signal having a wavelength λ2 and the optical signal having a wavelength λ4. The filter unit 252 is further configured to transmit the optical signal having a wavelength λ3 to the beam splitter 242 and transmit the sixth combined optical signal to the filter unit 253. After receiving the sixth combined optical signal from the filter unit 252, the filter unit 253 splits the sixth combined optical signal to obtain an optical signal having a wavelength λ4, and transmits the optical signal having wavelength λ4 to the beam splitter 242 and further transmits the optical signal having wavelength λ2 to the beam splitter 241. After receiving the optical signal having wavelength λ3 and the optical signal having wavelength λ4, the beam splitter 242 combines the optical signal having wavelength λ3 and the optical signal having wavelength λ4 into a seventh combined optical signal, and transmits the seventh combined optical signal to the fiber collimator 220. The fiber collimator 220 is further configured to output the seventh combined optical signal received from the beam splitter 242.

[0106] The optical signal transmission device provided in this embodiment of the present application includes a first beam splitter. The first beam splitter may obtain a fifth combined optical signal based on the optical signal of the first wavelength and the optical signal of the second wavelength, and transmit the fifth combined optical signal to a first fiber collimator. Therefore, the optical signal transmission device can output multiple split optical signals with different wavelengths through a single optical fiber.

[0107] Optionally, the optical signal transmission device may further input an optical signal through a fiber collimator and output an optical signal at the same time. With reference to FIG. 7 , the following describes how the optical signal transmission device provided in one embodiment of the present application inputs an optical signal through a fiber collimator and outputs an optical signal at the same time. Note that the optical signal transmission device 200 shown in FIG. 7 has the same structure as the optical signal transmission device 200 shown in FIG. 2. However, FIG. 7 illustrates different functions of the optical signal transmission device 200.

[0108] As shown in FIG. 7, the fiber collimator 210 included in the optical signal transmission device 200 is further configured to transmit an optical signal having a wavelength λ1 to the beam splitter 241 and output an optical signal having a wavelength λ2 received from the beam splitter 241.

[0109] The beam splitter 241 is configured to transmit an optical signal having a wavelength λ1 to the filter unit 251, and is further configured to receive an optical signal having a wavelength λ2 from the filter unit 252 and transmit the optical signal having wavelength λ2 to the fiber collimator 210.

[0110] The filter unit 251 is configured to receive the optical signal having wavelength λ 1 from the beam splitter and is further configured to transmit the optical signal having wavelength λ 1 to the fiber collimator 230 .

[0111] The filter unit 252 is configured to receive the ninth combined optical signal from the fiber collimator 230 and split the ninth combined optical signal to obtain an optical signal having a wavelength λ3. The ninth combined optical signal is an optical signal obtained by combining the optical signal having the wavelength λ2 and the optical signal having the wavelength λ3. The filter unit 252 is further configured to transmit the optical signal having the wavelength λ3 to the fiber collimator 220 and further transmit the optical signal having the wavelength λ2 to the beam splitter 241.

[0112] The fiber collimator 230 is configured to output the optical signal having wavelength λ1 received from the filter unit 251, and is further configured to input the ninth combined optical signal.

[0113] The optical signal transmission device provided in this embodiment of the present application includes a first beam splitter. The first beam splitter may transmit an optical signal of a first wavelength received from the first fiber collimator to the first filter unit, and may further transmit an optical signal of a second wavelength received from the second filter unit to the fiber collimator. Thus, the optical signal transmission device can simultaneously input and output optical signals through the first fiber collimator. Therefore, the optical signal transmission device provided in this embodiment of the present application supports direct connection to a single-core bidirectional optical module, and can receive an optical signal from the single-core bidirectional optical module while transmitting a split optical signal to the single-core bidirectional optical module.

[0114] 8 shows an optical signal transmission device according to another embodiment of the present invention. As shown in FIG. 8, the optical signal transmission device 800 includes a fiber collimator 810, a fiber collimator 820, a beam splitter 851 corresponding to the fiber collimator 810, a beam splitter 852 corresponding to the fiber collimator 820, a filter unit 861, a filter unit 862, a fiber collimator 830, and a fiber collimator 840.

[0115] The fiber collimator 810 is configured to transmit the combined optical signal #1 to the beam splitter 815. The combined optical signal #1 is an optical signal obtained by combining an optical signal having a wavelength λ1 and an optical signal having a wavelength λ2. Alternatively, the fiber collimator 810 is further configured to output the combined optical signal #2. The combined optical signal #2 is an optical signal obtained by combining an optical signal having a wavelength λ1 and an optical signal having a wavelength λ2.

[0116] The fiber collimator 820 is configured to transmit the combined optical signal #3 to the beam splitter 852. The combined optical signal #3 is an optical signal obtained by combining an optical signal having a wavelength λ3 and an optical signal having a wavelength λ4. Alternatively, the fiber collimator 820 is further configured to output a combined optical signal #4. The combined optical signal #4 is an optical signal obtained by combining an optical signal having a wavelength λ3 and an optical signal having a wavelength λ4.

[0117] The beam splitter 851 is configured to split the combined optical signal #1 into an optical signal having a wavelength λ1 and an optical signal having a wavelength λ2. The beam splitter 851 is further configured to transmit the optical signal having the wavelength λ1 to the filter unit 861 and to transmit the optical signal having the wavelength λ2 to the fiber collimator 830. Alternatively, the beam splitter 851 is further configured to receive the optical signal having the wavelength λ1 from the filter unit 861 and to receive the optical signal having the wavelength λ2 from the fiber collimator 840. The beam splitter 851 is further configured to obtain a combined optical signal #2 based on the optical signal having the wavelength λ1 and the optical signal having the wavelength λ2, and to transmit the combined optical signal #2 to the fiber collimator 810.

[0118] The beam splitter 852 is configured to split the combined optical signal #3 into an optical signal having a wavelength λ3 and an optical signal having a wavelength λ4. The beam splitter 852 is further configured to transmit the optical signal having the wavelength λ3 to the filter unit 862 and to transmit the optical signal having the wavelength λ4 to the fiber collimator 840. Alternatively, the beam splitter 852 is configured to receive the optical signal having the wavelength λ3 from the filter unit 862 and to receive the optical signal having the wavelength λ4 from the fiber collimator 840. The beam splitter 852 is further configured to obtain a combined optical signal #4 based on the optical signal having the wavelength λ3 and the optical signal having the wavelength λ4, and to transmit the combined optical signal #4 to the fiber collimator 820.

[0119] The reflector 8611 included in the filter unit 861 is configured to receive the optical signal having wavelength λ1 from the beam splitter 851. The filter 8612 included in the filter unit 861 is configured to transmit the optical signal having wavelength λ1 to the fiber collimator 840. Alternatively, the filter 8612 included in the filter unit 861 is configured to receive a combined optical signal #5 from the fiber collimator 840. The combined optical signal #5 is an optical signal obtained by combining an optical signal having wavelength λ1 and an optical signal having wavelength λ4. The filter 8612 is further configured to split the optical signal having wavelength λ1 from the combined optical signal #5 and transmit the optical signal having wavelength λ1 to the beam splitter 851 through the reflector 8611.

[0120] The reflector 8621 included in the filter unit 862 is configured to receive the optical signal having a wavelength λ3 from the beam splitter 852. The filter 8622 included in the filter unit 861 is configured to transmit the optical signal having the wavelength λ3 to the fiber collimator 830. Alternatively, the filter 8622 included in the filter unit 862 is configured to receive the combined optical signal #6 from the fiber collimator 830. The combined optical signal #6 is an optical signal obtained by combining the optical signal having the wavelength λ3 and the optical signal having the wavelength λ2. The filter 8622 is further configured to split the optical signal having the wavelength λ3 from the combined optical signal #6 and transmit the optical signal having the wavelength λ3 to the beam splitter 852 through the reflector 8621.

[0121] The fiber collimator 830 is configured to output a combined optical signal #7. The combined optical signal #7 is an optical signal obtained by combining an optical signal of wavelength λ2 and an optical signal of wavelength λ3. Alternatively, the fiber collimator 830 is further configured to transmit the combined optical signal #6 to the filter unit 861.

[0122] The fiber collimator 840 is configured to output a combined optical signal #8, which is an optical signal obtained by combining an optical signal having a wavelength λ1 and an optical signal having a wavelength λ4. Alternatively, the fiber collimator 840 is further configured to send the combined optical signal #5 to the filter unit 862.

[0123] 8 is described using an example in which fiber collimator 830 is configured to transmit optical signals of wavelength λ2 and wavelength λ3, and fiber collimator 840 is configured to transmit optical signals of wavelength λ1 and wavelength λ4. As long as fiber collimator 830 and fiber collimator 840 are configured to transmit optical signals of different wavelengths, fiber collimator 830 and fiber collimator 840 may separately transmit any one or more optical signals of four optical signals of different wavelengths. For example, fiber collimator 830 is configured to transmit an optical signal of wavelength λ1, and fiber collimator 840 is configured to transmit optical signals of the remaining three wavelengths.

[0124] An embodiment of the present application further provides an optical transmission system. The optical transmission system includes a first optical module, a second optical module, and an optical signal transmission device. The first optical module is configured to transmit the first combined optical signal to the first fiber collimator and / or the first optical module is configured to receive the fifth combined optical signal from the first fiber collimator. The second optical module is configured to transmit an optical signal of a third wavelength to the second fiber collimator and / or the second optical module is configured to receive the optical signal of the third wavelength from the second fiber collimator.

[0125] Optionally, the second optical module is configured to send the eighth combined optical signal to the second fiber collimator, and / or the second optical module is configured to receive the seventh combined optical signal from the second fiber collimator.

[0126] 9 is an example of a first optical module, and optical module 920 is an example of a second optical module. Optical module 910 is configured to transmit a first combined optical signal to fiber collimator 210. The first combined optical signal is an optical signal obtained by combining an optical signal having a wavelength λ1 and an optical signal having a wavelength λ2. Optical module 920 is configured to transmit an optical signal having a wavelength λ3 to fiber collimator 220.

[0127] Please refer to Figures 2 to 7 above for a description of the optical signal transmission device 200. For the sake of brevity, the details will not be described again here.

[0128] In the optical transmission system provided in this embodiment of the present application, the optical signal transmission device includes a first beam splitter. The first beam splitter may split the first combined optical signal received from the first fiber collimator into an optical signal of a first wavelength and an optical signal of a second wavelength. Thus, the optical signal transmission device can multiplex the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of a third wavelength input by the second fiber collimator. Therefore, in the optical transmission system provided in this embodiment of the present application, an optical module configured to send the first combined optical signal may be connected to the optical signal transmission device through an optical fiber, thereby saving optical fiber resources and reducing installation difficulties.

[0129] Alternatively, the first beam splitter may further obtain a fifth combined optical signal based on the optical signal of the first wavelength and the optical signal of the second wavelength, and transmit the fifth combined optical signal to the first fiber collimator. Thus, the optical signal transmission device can output multiple split optical signals of different wavelengths through a single optical fiber. Therefore, in the optical transmission system provided in this embodiment of the present application, an optical module configured to receive the fifth combined optical signal may be connected to the optical signal transmission device through an optical fiber, thereby saving optical fiber resources and reducing installation difficulties.

[0130] The above description is merely a specific implementation of the present application and is not intended to limit the scope of protection of the present application. Any variations or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall fall within the scope of protection of the present application. Therefore, the protection of the present application should be subject to the scope of protection of the claims.

Claims

1. An optical signal transmission device having a first fiber collimator, a second fiber collimator, a first beam splitter, a first filter unit, a second filter unit, and a third fiber collimator, the first fiber collimator is configured to input a first combined optical signal, the first combined optical signal being an optical signal obtained by combining an optical signal of a first wavelength and an optical signal of a second wavelength; the first beam splitter is configured to split the first combined optical signal from the first fiber collimator into an optical signal at the first wavelength and an optical signal at the second wavelength; the first beam splitter is further configured to transmit the optical signal at the first wavelength as spatial light to the first filter unit, and the first filter unit is configured to transmit the optical signal at the first wavelength as spatial light to the third fiber collimator; the first beam splitter is further configured to transmit the optical signal at the second wavelength as spatial light through the first filter unit and the second filter unit to the third fiber collimator; the second fiber collimator is configured to input an optical signal at a third wavelength; the second filter unit is configured to transmit the optical signal of the third wavelength from the second fiber collimator to the third fiber collimator as spatial light; the third fiber collimator is configured to output a second combined optical signal, the second combined optical signal being an optical signal obtained by combining the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength; Optical signal transmission device.

2. the third fiber collimator is further configured to input a third combined optical signal, the third combined optical signal being an optical signal obtained by combining the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength; the first filter unit is further configured to split the third combined optical signal from the third fiber collimator into an optical signal of the first wavelength and a fourth combined optical signal, and transmit the optical signal of the first wavelength to the first beam splitter as spatial light, the fourth combined optical signal being an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of the third wavelength; the first filter unit is further configured to transmit the fourth combined optical signal as spatial light to the second filter unit; the second filter unit is further configured to split the fourth combined optical signal to obtain the optical signal at the third wavelength and transmit the optical signal at the third wavelength as spatial light to the second fiber collimator; the second filter unit is further configured to transmit the optical signal at the second wavelength as spatial light to the first beam splitter; the first beam splitter is configured to transmit a fifth combined optical signal as spatial light to the first fiber collimator, the fifth combined optical signal being an optical signal obtained by combining the optical signal of the first wavelength and the optical signal of the second wavelength; the first fiber collimator is further configured to output the fifth combined optical signal; the second fiber collimator is further configured to output an optical signal at the third wavelength.

2. The optical signal transmission device according to claim 1.

3. 3. The optical signal transmission device according to claim 1, wherein the first beam splitter is an optical sheet device made of glass, silicon, or plastic.

4. 3. The optical signal transmission device according to claim 1, wherein the wavelength of the optical signal of the third wavelength is longer than the wavelength of the optical signal of the first wavelength, and the wavelength of the optical signal of the third wavelength is shorter than the wavelength of the optical signal of the second wavelength.

5. 3. The optical signal transmission device according to claim 1, wherein the first filter unit includes a first reflector and / or a first filter.

6. 3. The optical signal transmission device according to claim 1, wherein the second filter unit includes a second reflector and / or a second filter.

7. An optical transmission system having a first optical module, a second optical module, and an optical signal transmission device, the optical signal transmission device having a first fiber collimator, a second fiber collimator, a first beam splitter, a first filter unit, a second filter unit, and a third fiber collimator; the first optical module is configured to send a first combined optical signal to the first fiber collimator, the first combined optical signal being an optical signal obtained by combining an optical signal of a first wavelength and an optical signal of a second wavelength; the first fiber collimator is configured to transmit the first combined optical signal as spatial light to the first beam splitter; the first beam splitter is configured to split the first combined optical signal from the first fiber collimator into an optical signal at the first wavelength and an optical signal at the second wavelength; the first beam splitter is further configured to transmit the optical signal at the first wavelength as spatial light to the first filter unit, and the first filter unit is configured to transmit the optical signal at the first wavelength as spatial light to the third fiber collimator; the first beam splitter is further configured to transmit the optical signal at the second wavelength as spatial light through the first filter unit and the second filter unit to the third fiber collimator; the second optical module is configured to transmit an optical signal at a third wavelength to the second fiber collimator; the second filter unit is configured to transmit the optical signal of the third wavelength from the second fiber collimator to the third fiber collimator as spatial light; the third fiber collimator is configured to output a second combined optical signal, the second combined optical signal being an optical signal obtained by combining the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength; Optical transmission system.

8. the third fiber collimator is further configured to input a third combined optical signal, the third combined optical signal being an optical signal obtained by combining the optical signal of the first wavelength, the optical signal of the second wavelength, and the optical signal of the third wavelength; the first filter unit is further configured to split the third combined optical signal from the third fiber collimator into an optical signal of the first wavelength and a fourth combined optical signal, and transmit the optical signal of the first wavelength to the first beam splitter as spatial light, the fourth combined optical signal being an optical signal obtained by combining the optical signal of the second wavelength and the optical signal of the third wavelength; the first filter unit is further configured to transmit the fourth combined optical signal as spatial light to the second filter unit; the second filter unit is further configured to split the fourth combined optical signal to obtain the optical signal at the third wavelength and transmit the optical signal at the third wavelength as spatial light to the second fiber collimator; the second filter unit is further configured to transmit the optical signal at the second wavelength as spatial light to the first beam splitter; the first beam splitter is configured to transmit a fifth combined optical signal as spatial light to the first fiber collimator, the fifth combined optical signal being an optical signal obtained by combining the optical signal of the first wavelength and the optical signal of the second wavelength; the first optical module is further configured to receive the fifth combined optical signal from the first fiber collimator; the second optical module is further configured to receive the optical signal at the third wavelength from the second fiber collimator.

8. The optical transmission system according to claim 7.

9. 9. The optical transmission system according to claim 7, wherein the first beam splitter is an optical sheet device made of glass, silicon, or plastic.

10. 9. The optical transmission system according to claim 7, wherein the wavelength of the optical signal of the third wavelength is greater than the wavelength of the optical signal of the first wavelength, and the wavelength of the optical signal of the third wavelength is smaller than the wavelength of the optical signal of the second wavelength.

11. 9. The optical transmission system according to claim 7, wherein the first filter unit comprises a first reflector and / or a first filter.

12. 9. The optical transmission system according to claim 7, wherein the second filter unit includes a second reflector and / or a second filter.

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