Four-mode bifurcation multiplexing optical communication system on silicon substrate

Abstract

The invention discloses a four-mode bifurcation multiplexing optical communication system on a silicon substrate. Comprising a left side input waveguide, a left side four-mode converter, a left side output waveguide, a TE3 mode demultiplexer, a TE2 mode demultiplexer, a middle transition waveguide, a TE2 mode multiplexer, a TE3 mode multiplexer, a right side input waveguide, a right side four-mode converter and a right side output waveguide from left to right in sequence. Mode conversion is carried out on an input optical signal through the left side four-mode converter and the right side four-mode converter, demultiplexing is carried out on the optical signal through the TE3 mode demultiplexer and the TE2 mode demultiplexer, signal transmission is realized through the middle transition waveguide, multiplexing is carried out through the TE2 mode multiplexer and the TE3 mode multiplexer, and signal transmission is realized through the TE3 mode converter and the TE2 mode demultiplexer. And finally, the signal is output to the right output waveguide, so that flexible signal scheduling and management are realized. According to the invention, through efficient mode conversion, demultiplexing and multiplexing technologies, the defects in the prior art are overcome, and the transmission capability and the integration level of the system are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a four-mode bifurcation multiplexing optical communication system on a silicon substrate. Background Art

[0002] In modern optical communication systems, traditional wavelength division multiplexing systems can transmit data in a single optical waveguide through different optical wavelengths, alleviating the transmission capacity pressure of the communication system. However, with the advancement of optical communication networks, the demand for bandwidth in cloud computing, artificial intelligence large models, 6G communications, etc. is growing exponentially. Wavelength division multiplexing technology faces problems such as bandwidth limitations and device size. In this context, mode division multiplexing technology can use different transmission modes in optical waveguides to increase transmission capacity and has received widespread attention.

[0003] The forked multiplexing system in wavelength division multiplexing technology can selectively allocate each wavelength to different branch networks by using optical cross-connectors, wavelength division multiplexers, etc., and maintain high-quality signal transmission, thereby enhancing the bandwidth utilization of the system and improving the flexibility and scalability of the optical interconnection network. With the development of mode division multiplexing technology, researchers have used mode allocation technology, mode multiplexing and demultiplexing technology to apply the forked multiplexing system in the field of mode division multiplexing, further optimizing the performance of the mode division multiplexing system.

[0004] In data center networks, silicon-based photonic devices (such as mode couplers and mode filters) enable bifurcation multiplexing technology to be more effectively implemented in a low-power and high-integration manner. However, in optical communication systems with high density, low cost, and high bandwidth requirements, existing technologies still face problems such as large device size, low efficiency, and insufficient integration. Therefore, how to further increase the number of multiplexing modes and the transmission capacity of the system is still a technical problem to be solved in the field of optical communications. Summary of the invention

[0005] Purpose of the invention: The present invention provides a four-mode bifurcation multiplexing optical communication system on a silicon substrate, which overcomes the shortcomings of the prior art through efficient mode conversion, demultiplexing and multiplexing technologies, and significantly improves the transmission capacity and integration of the system.

[0006] Technical solution: The four-mode bifurcation multiplexing optical communication system on a silicon substrate described in the present invention comprises: from left to right, a left input waveguide, a left four-mode converter, a left output waveguide, a TE 3 Mode Demultiplexer, TE 2 Mode demultiplexer, intermediate transition waveguide, TE 2 Mode multiplexer, TE 3Mode multiplexer, right input waveguide, right four-mode converter, right output waveguide. The optical signal is input from the left input waveguide, mode-converted through the left four-mode switch, and output from the left output waveguide. The high-order mode (TE2 or TE3 mode) in the output optical signal is demultiplexed through the TE3 mode demultiplexer and the TE2 mode demultiplexer, respectively, and output from their respective ports. Subsequently, the low-order mode (TE0 or TE1 mode) in the output optical signal is transmitted through the intermediate transition waveguide. The high-order mode (TE2 or TE3 mode) is input through the TE2 mode multiplexer and the TE3 mode multiplexer, and then input through the right input waveguide. The mode is converted through the right four-mode converter, and finally the signal is input to the right output waveguide to achieve flexible signal scheduling and management of the four modes.

[0007] Furthermore, at the left end of the system, the left quad-mode converter converts the input optical signal into different modes, including TE 0 TE 1 TE 2 and TE 3 .

[0008] Furthermore, the structural parameters of the left four-mode converter and the right four-mode converter are the same, realizing TE 0 and TE 1 Mode and TE 2 and TE 3 Conversion between modes.

[0009] Furthermore, TE 3 Mode Demultiplexer and TE 3 The mode multiplexer has the same structure and parameter configuration to achieve TE 3 Demultiplexing and multiplexing of patterns.

[0010] Furthermore, TE 2 Mode Demultiplexer and TE 2 The mode multiplexer has the same structure and parameter configuration to achieve TE 2 Demultiplexing and multiplexing of patterns.

[0011] Furthermore, the intermediate transition waveguide is a gradient waveguide that is symmetrical about the left and right sides, and the narrowest width can ensure TE 0 and TE 1 Mode passed, TE 2 and TE 3 Mode not passed.

[0012] Furthermore, the multiplexed optical signal is mode-converted through the right four-mode converter into a mode suitable for output, and the converted optical signal is transmitted through the right output waveguide, completing the entire optical transmission process.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the system realizes the independent transmission of signals of different modes through the design of mode converter and high-order mode demultiplexer, which significantly enhances the anti-interference ability of the system; the efficient design of mode separation and multiplexing enables the system to provide stable and reliable transmission services in complex optical network environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the four-mode bifurcation multiplexing optical communication system on a silicon substrate of the present invention.

[0015] Figure 2 Schematic diagram of a four-mode converter of the present invention.

[0016] Figure 3 In the present invention, TE 0 Schematic diagram of the system operation when the mode is input into the waveguide from the left.

[0017] Figure 4 In the present invention, TE 1 Schematic diagram of the system operation when the mode is input into the waveguide from the left.

[0018] Figure 5 In the present invention, TE 2 Schematic diagram of the system operation when the mode is input into the waveguide from the left.

[0019] Figure 6 In the present invention, TE 3 Schematic diagram of the system operation when the mode is input into the waveguide from the left.

[0020] Figure 7 In the present invention, TE 0 Mode from TE 3 Schematic diagram of the system operation when the mode multiplexer is input.

[0021] Figure 8 In the present invention, TE 0 Mode from TE 2 Schematic diagram of the system operation when the mode multiplexer is input. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, a four-mode bifurcation multiplexing optical communication system on a silicon substrate includes: a left input waveguide 1, a left four-mode converter 2, a left output waveguide 7, a TE 3 Mode Demultiplexer 3, TE 2 Mode demultiplexer 8, intermediate transition waveguide 4, TE 2 Mode multiplexer 9, TE 3Multiple functional modules such as the mode multiplexer 5, the right input waveguide 10, the right four-mode converter 6, and the right output waveguide 11 ensure efficient conversion, multiplexing, demultiplexing and transmission of the four modes.

[0023] like Figure 2 As shown, at the left end of the system, the left quad-mode converter 2 can convert the input optical signal into different modes, including TE 0 TE 1 TE 2 and TE 3 The four-mode converter can efficiently achieve low-loss mode conversion, facilitating the multiplexing and demultiplexing of subsequent modes. The four-mode converter on the right is consistent with the four-mode converter on the left, ensuring the mutual conversion of optical signals between different modes.

[0024] After the optical signal undergoes four-mode conversion, it passes through TE 3 Mode Demultiplexer 3 and TE 2 Mode Demultiplexer 8. TE 3 Mode demultiplexer 3 is mainly responsible for converting TE 3 The optical signal of the mode is separated, and the TE 2 The mode demultiplexer 8 is used to demultiplex TE 2 pattern of light signals.

[0025] The intermediate transition waveguide 4 is designed as a bilaterally symmetrical gradual waveguide. The narrowest part of the intermediate transition waveguide can accurately ensure that the optical signal TE 0 and TE 1 mode transmission, while TE 2 and TE 3 The mode will not pass through this part, thereby achieving physical isolation and independent transmission of signals of different modes, greatly improving the transmission efficiency and mode control capability of the system.

[0026] After the optical signal passes through the intermediate transition waveguide, it passes through the TE 2 Mode multiplexer 9 and TE 3 Mode Multiplexer 5. TE 2 Mode Multiplexer and TE 3 The design of the mode multiplexer uses the same structure and parameter configuration as the demultiplexer to ensure TE 2 and TE 3 Efficient multiplexing and demultiplexing of modes. Through these two multiplexers, the system can flexibly recombine optical signals of different modes to achieve signal multiplexing and efficient transmission.

[0027] Finally, the multiplexed optical signal is converted into a mode suitable for output through the right four-mode converter 6. The converted optical signal is transmitted through the right output waveguide 11, completing the entire optical transmission process.

[0028] In order to better explain the working principle of the system, the following introduces the working conditions of the system under different input conditions:

[0029] (1) Figure 3 As shown, when TE 0 When the mode is input from the left input waveguide, it first passes through the left four-mode converter to the left output waveguide area and is converted into TE 1 Mode, TE 1 The mode passes through the middle transition waveguide and reaches the input waveguide area on the right, and is converted into TE by the four-mode converter on the right. 0 mode, output from the right output waveguide.

[0030] (2) Figure 4 As shown, when TE 1 When the mode is input from the left input waveguide, it first passes through the left four-mode converter to the left output waveguide area and is converted into TE 0 Mode, TE 0 The mode passes through the middle transition waveguide and reaches the input waveguide area on the right, and is converted into TE by the four-mode converter on the right. 1 mode, output from the right output waveguide.

[0031] (3) Figure 5 As shown, when TE 3 When the mode is input from the left input waveguide, it first passes through the left four-mode converter to the left output waveguide area and is converted into TE 2 Mode, TE 2 Mode by TE 2 Mode demultiplexer demultiplexes into TE 0 Mode output.

[0032] (4) Figure 6 As shown, when TE 3 When the mode is input from the left input waveguide, it first passes through the left four-mode converter to the left output waveguide area and is converted into TE 2 Mode, TE 2 Mode by TE 2 Mode demultiplexer demultiplexes into TE 0 Mode output.

[0033] (5) Figure 7 As shown, when TE 0 Mode from TE 3 Mode multiplexer input, arriving at the right input waveguide multiplexed into TE 3 mode, converted to TE by the four-mode converter on the right 2 mode, output from the right output waveguide.

[0034] (6) Figure 8 As shown, when TE 0 Mode from TE 2 Mode multiplexer input, arriving at the right input waveguide multiplexed into TE 2 mode, converted to TE by the four-mode converter on the right 3 mode, output from the right output waveguide.

[0035] This optical communication system takes advantage of the process compatibility of the silicon photonics platform and can achieve efficient conversion, separation and multiplexing of different modes on the same substrate. Through the integrated design of the silicon substrate, the system achieves miniaturization and low cost while maintaining high transmission efficiency. In addition, the system's mode separation and multiplexing process ensures the independence of the optical signal, improves the anti-interference ability and the quality of signal transmission. Compared with traditional optical communication systems, the system of the present invention has significant advantages in bandwidth, capacity and flexibility.

[0036] The system significantly improves communication bandwidth and system capacity through precise mode conversion, demultiplexing and multiplexing technology, and is particularly suitable for high-speed, large-capacity optical communication applications. By utilizing the process compatibility of silicon photonics, the system not only has higher integration and low loss characteristics, but also supports more flexible signal scheduling and management, providing strong technical support for the development of modern communication technology.

Claims

1. A four-mode bifurcation multiplexing optical communication system on a silicon substrate, characterized in that: include: From left to right, they are the left input waveguide (1), the left four-mode converter (2), the left output waveguide (7), the TE3 mode demultiplexer (3), the TE2 mode demultiplexer (8), the intermediate transition waveguide (4), the TE2 mode multiplexer (9), the TE3 mode multiplexer (5), the right input waveguide (10), the right four-mode converter (6), and the right output waveguide (11). An optical signal is input from the left input waveguide (1), undergoes mode conversion through the left four-mode converter (2), and is output from the left output waveguide (7). The output optical signal contains TE2 or TE3 The optical signals are demultiplexed by the TE3 mode demultiplexer (3) and the TE2 mode demultiplexer (8) and output from their respective ports. The TE0 or TE1 mode in the output optical signal is then transmitted through the intermediate transition waveguide (4). The TE2 or TE3 mode is input through the TE2 mode multiplexer (9) and the TE3 mode multiplexer (5), and then input through the right input waveguide (10). The mode is converted by the right four-mode converter (6), and finally the signal is input to the right output waveguide (11), so as to realize flexible signal scheduling and management of the four modes.

2. The four-mode bifurcation multiplexing optical communication system on a silicon substrate as claimed in claim 1, characterized in that: At the left end of the system, the left quad-mode converter (2) converts the input optical signal into different modes, including TE0, TE1, TE2 and TE3.

3. The four-mode bifurcation multiplexing optical communication system on a silicon substrate as claimed in claim 1, characterized in that: The four-mode converter (2) on the left and the four-mode converter (6) on the right have the same structural parameters, and realize mutual conversion between TE0 and TE1 modes and between TE2 and TE3 modes.

4. The four-mode bifurcation multiplexing optical communication system on a silicon substrate as claimed in claim 1, characterized in that: The TE3 mode demultiplexer (3) and the TE3 mode multiplexer (5) have the same structure and parameter configuration to achieve demultiplexing and multiplexing of the TE3 mode.

5. The four-mode bifurcation multiplexing optical communication system on a silicon substrate as claimed in claim 1, characterized in that: The TE2 mode demultiplexer (8) and the TE2 mode multiplexer (9) have the same structure and parameter configuration to achieve demultiplexing and multiplexing of the TE2 mode.

6. The four-mode bifurcation multiplexing optical communication system on a silicon substrate as claimed in claim 1, characterized in that: The intermediate transition waveguide (4) is a tapered waveguide that is symmetrical about the left and right sides, and its narrowest width can ensure that the TE0 and TE1 modes pass through, but the TE2 and TE3 modes do not pass through.

7. The on-chip four-mode bifurcation multiplexing optical communication system according to claim 1, characterized in that: The multiplexed optical signal undergoes mode conversion through the right four-mode converter (6) and is converted into a mode suitable for output. The converted optical signal is transmitted through the right output waveguide (11), completing the entire optical transmission process.

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