Optical switch network chip with multi-wavelength routing function and optical signal routing method

Abstract

This invention relates to optical switch network chips, specifically to an optical switch network chip with multi-wavelength routing capabilities and an optical signal routing method, to address the shortcomings of existing wavelength-routing optical switching network schemes, such as system complexity, large chip area, and crosstalk superposition. The optical switch network chip of this invention with multi-wavelength routing capabilities is used to realize the routing and switching of multi-wavelength optical signals. It includes an input port, an output port, multiple wavelength-routing optical switch units sequentially arranged between the input and output ports, and multiple waveguide interconnect networks connecting adjacent wavelength-routing optical switch units. Each wavelength-routing optical switch unit includes multiple wavelength-selective optical switches for wavelength selection and output, ultimately enabling optical signals input at any input port to alternately pass through multiple wavelength-routing optical switch units and multiple waveguide interconnect networks, and be routed to any output port.

Description

Technical Field

[0001] This invention relates to optical switch network chips, specifically to optical switch network chips with multi-wavelength routing capabilities and optical signal routing methods. Background Technology

[0002] With the explosive growth in AI computing power demand, data center networks urgently need high-throughput, low-power switching solutions. Current mainstream solutions rely on high-speed electrical switches, whose optical / electrical / optical (O / E / O) conversion process requires optical transceivers, resulting in high power consumption per conversion and creating a huge energy bottleneck in large-scale switching systems. In contrast, optical switching technology eliminates the O / E / O conversion process, offering significant advantages in low power consumption and high energy efficiency. Furthermore, it is transparent to data bit rate, modulation format, and communication protocols, making it an ideal choice for next-generation data center networks. However, traditional optical switching networks, such as those based on Mach-Zehnder interferometers (MZI), have fundamental limitations: a lack of multi-wavelength routing capability, meaning they cannot process wavelength division multiplexing (WDM) signals in parallel within the same architecture, severely limiting bandwidth utilization.

[0003] To realize optical switching network chips with wavelength routing capabilities, the current approach is to add wavelength division multiplexers (WDMs) to the input / output terminals of the optical network chip. First, different wavelengths of the input signal are demultiplexed. Then, signals of the same wavelength from different physical channels are introduced into the same optical switching network. Finally, different wavelengths are combined at the output terminal to achieve wavelength routing. However, this method requires the WDM and demultiplexing devices to work with multiple switching networks, resulting in high system complexity and poor integration and scalability.

[0004] Existing wavelength-routing optical switching network solutions typically require external wavelength division multiplexing / demultiplexing units (WDM / demultiplexers) at the input / output ends of the optical switching network chip. This involves first demultiplexing the input optical signal to multiple physical channels, allowing the same wavelength to enter independent optical switch sub-networks for switching, and finally remultiplexing the output. This approach leads to three structural drawbacks: a surge in system complexity (the demultiplexer, multiplexer, and N independent switch networks (wavelengths) require precise alignment and integration); an exponential increase in chip area (N times the number of switch networks increases the chip area by at least N times, including waveguide wiring space); and uncontrolled crosstalk superposition (insertion loss from multiple multiplexers / demultiplexers and crosstalk between sub-networks combine to degrade the overall optical signal-to-noise ratio). This discrete architecture severely restricts the scalability and energy efficiency of optical switching networks, necessitating a monolithically integrated multi-wavelength-routing optical switching network chip that can directly perform wavelength-space joint switching within a single topology. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing wavelength-routing optical switching network solutions, such as system complexity, large chip area, and crosstalk superposition, and to provide an optical switching network chip with multi-wavelength routing function and an optical signal routing method.

[0006] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0007] A multi-wavelength routing optical switch network chip is characterized by comprising M input ports, M output ports, multiple wavelength routing optical switch units sequentially arranged between the input ports and output ports, and multiple waveguide interconnect networks connecting adjacent wavelength routing optical switch units, wherein M ≥ 2; each wavelength routing optical switch unit includes multiple wavelength selective optical switches for wavelength selection and output, and the control terminal of each wavelength selective optical switch is connected to an external control power supply; in the multiple wavelength routing optical switch units, the input terminals of each wavelength selective optical switch in the wavelength routing optical switch unit located at one end are respectively connected to M input ports; in the wavelength routing optical switch unit located at the other end, the output terminals of each wavelength selective optical switch are respectively connected to M output ports; the wavelength selective optical switches between adjacent wavelength routing optical switch units are cascaded through waveguide interconnect networks; the optical signal input at any input port alternately passes through multiple wavelength routing optical switch units and multiple waveguide interconnect networks, and is routed to any output port for output.

[0008] Furthermore, the waveguide interconnection network includes multiple optical waveguide cross structures and / or directly connected waveguides;

[0009] The optical waveguide cross structure is configured as a Y×Y optical waveguide cross structure, where Y≥2; or, the optical waveguide cross structure is configured as one of a tapered gradient waveguide cross, a multimode interference coupling cross, or a subwavelength grating waveguide cross.

[0010] Furthermore, the wavelength-selective optical switch is a 2×2 optical switch.

[0011] Furthermore, the wavelength-selective optical switch includes a first waveguide and a second waveguide arranged in parallel, and N sets of cascaded resonant structures arranged sequentially between the first waveguide and the second waveguide along the waveguide length direction; each set of cascaded resonant structures includes J cascaded optical micro-resonators, where N≥1 and J is an even number;

[0012] In each cascaded resonant structure, the optical micro-resonators at both ends are coupled to the first waveguide and the second waveguide, respectively.

[0013] Furthermore, the first waveguide and the second waveguide are respectively provided with bent coupling parts for coupling with the corresponding cascaded resonant structure. The bent coupling parts adopt circular bending, Euler bending, Bessel bending or polynomial interconnected circular bending structure.

[0014] The wavelength-selective optical switch modulates wavelengths through thermo-optical or electro-optical effects.

[0015] Furthermore, the optical microresonator is a microring resonator or a microdisk resonator;

[0016] J=2;

[0017] The N=4;

[0018] The Y=2 and / or Y=4.

[0019] Furthermore, multiple wavelength routing optical switch units are cascaded according to the Benes network architecture;

[0020] The number of wavelength routing optical switch units is set to The number of waveguide interconnect networks is set to [number]. indivual.

[0021] Furthermore, the input port and output port are respectively configured as a vertical grating coupler, an end-face coupler, or a coupling structure based on photonic wire bonding;

[0022] The wavelength-selective optical switch and the waveguide interconnect network are made of silicon nitride, lithium niobate and / or silicon materials.

[0023] Meanwhile, the present invention also provides an optical signal routing method, which is characterized by including the following steps:

[0024] Step 1: Connect the optical switch network chip with multi-wavelength routing function to the external control power supply, and connect the input ports to the external signal input optical fiber and the output ports to the external signal output optical fiber.

[0025] Step 2: Adjust the external control power supply to generate a control voltage, perform wavelength modulation, and select the operating wavelength of the wavelength-selective optical switch.

[0026] Step 3: Input optical signals to one or more input ports through the signal input optical fiber, wherein the optical signals include at least one wavelength;

[0027] Step 4: Multiple wavelength optical signals alternately pass through multiple wavelength routing optical switch units and multiple waveguide interconnection networks, and are routed to any output port for output, realizing one-to-one, one-to-many, or many-to-one multi-wavelength routing optical signal transmission.

[0028] The beneficial effects of this invention are:

[0029] 1. In this invention, the wavelength routing optical switch unit is equipped with multiple wavelength selective optical switches. Multi-wavelength optical signals are routed through the wavelength selective optical switches, so that any specific wavelength optical signal at any input port can be routed independently and without interference to any output port. This enables one-to-one, one-to-many, and many-to-many multi-wavelength routed optical signal transmission between input ports and output ports, which is convenient for optical switching and optical interconnection in high-performance computers and data centers.

[0030] 2. This invention achieves wavelength selection through a cascaded resonant structure. The number of wavelengths can be adjusted by controlling the number of cascaded resonant structures. Compared with existing network chips with multi-wavelength routing capabilities, more wavelengths can be routed on a smaller chip area, effectively reducing the chip area.

[0031] 3. This invention embeds wavelength-selective optical switches into the Benes network architecture to achieve highly integrated wavelength-space joint switching within a single chip, eliminating the need for external wavelength division multiplexers, demultiplexer modules, and redundant switching networks. This significantly reduces system size, cost, and packaging complexity, while achieving low-loss, high-isolation, and reconfigurable routing paths to meet the high-energy-efficiency and high-bandwidth optical interconnect requirements of data centers.

[0032] 4. In one-to-one port transmission, this invention allows each optical signal to undergo only one transmission path from input to output. Each wavelength routing optical switch unit and up to The optical waveguide cross structure uses a large-port cross device, a 4×4 optical waveguide cross structure, which simplifies the wavelength routing path. Therefore, the multi-wavelength routing loss of optical signals is lower and the optical transmission uniformity is better. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the 16×16×4λ optical switch network chip in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the 2×2 optical switch structure in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the cascaded resonant structure in the 2×2 optical switch in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of a 4×4 optical switching structure in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of a 4×4 optical waveguide cross structure in an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of a 2×2 optical waveguide cross structure in an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100 - Wavelength routing optical switch unit, 11 - First wavelength routing optical switch unit, 12 - Second wavelength routing optical switch unit, 13 - Third wavelength routing optical switch unit, 14 - Fourth wavelength routing optical switch unit, 15 - Fifth wavelength routing optical switch unit, 16 - Sixth wavelength routing optical switch unit, 17 - Seventh wavelength routing optical switch unit;

[0042] 200 - Waveguide interconnection network, 21 - First waveguide interconnection network, 22 - Second waveguide interconnection network, 23 - Third waveguide interconnection network, 24 - Fourth waveguide interconnection network, 25 - Fifth waveguide interconnection network, 26 - Sixth waveguide interconnection network;

[0043] 300 - Wavelength-selective optical switch, 01 - First optical switch, 02 - Second optical switch, 03 - Third optical switch, 04 - Fourth optical switch, 05 - Fifth optical switch, 06 - Sixth optical switch, 07 - Seventh optical switch, 08 - Eighth optical switch, 301 - First waveguide, 302 - Second waveguide, 303 - Cascaded resonant structure, 304 - Micro-ring resonator, 305 - Coupling region, 306 - Heated metal, 307 - Metal pad;

[0044] 400 - Input port, 500 - Output port. Detailed Implementation

[0045] The present invention provides an optical switch network chip with multi-wavelength routing function, including M input ports 400 and M output ports 500, as well as a plurality of wavelength routing optical switch units 100 arranged sequentially and a plurality of waveguide interconnection networks 200 respectively arranged between adjacent wavelength routing optical switch units 100.

[0046] Each wavelength routing optical switch unit 100 includes multiple wavelength selective optical switches 300 for wavelength selection and output of optical signals. In this embodiment, the wavelength selective optical switches 300 are 2×2 optical switches, and the number of 2×2 optical switches in each wavelength routing optical switch unit 100 is M / 2. The input terminals of the 2×2 optical switches in one end of the wavelength routing optical switch unit 100 are connected to M input ports 400 respectively, and the output terminals of the 2×2 optical switches in the other end of the wavelength routing optical switch unit 100 are connected to M output ports 500 respectively. In other embodiments of the present invention, the wavelength selective optical switches 300 can also be set as 1×0 optical switches, where I≥2 and O≥2, depending on the size of the optical switch network chip.

[0047] The main structure of the 2×2 optical switch includes a first waveguide 301 and a second waveguide 302 arranged in parallel, and N sets of cascaded resonant structures 303 arranged sequentially along the length of the waveguides between the first waveguide 301 and the second waveguide 302 to route optical signals of N wavelengths. Each set of cascaded resonant structures 303 includes J cascaded optical micro-resonators, which can be micro-ring resonators 304 or micro-disk resonators, where N≥1, J is an even number, and the J optical micro-resonators are arranged in a direction perpendicular to the first waveguide 301 and the second waveguide 302. In this embodiment, micro-ring resonators 304 are used, N=4, J=2. In each set of cascaded resonant structures 303, the micro-ring resonators 304 at both ends are coupled to the first waveguide 301 and the second waveguide 302 respectively, exhibiting wide wavelength selectivity. Both the first waveguide 301 and the second waveguide 302 have curved coupling sections for coupling with the cascaded resonant structure 303. Based on this, utilizing the wavelength resonance characteristics of the cascaded resonant structure 303, different wavelength optical signals from the input wavelength routing optical switch unit 100 can selectively pass through the corresponding cascaded resonant structure 303, achieving cross-coupling or direct transmission between the first waveguide 301 and the second waveguide 302, thus enabling the selection of N specific wavelengths λ. The wavelengths of the N cascaded resonant structures 303 can be preset to N different resonant wavelengths, forming N wavelength channels. This allows for arbitrary routing control of optical signals from N independent wavelength channels. The number of cascaded resonant structures 303 can be set according to the number of wavelengths of the optical signals to be routed, effectively solving the problem of existing Mach-Zehnder interferometer (MZI)-based optical switch networks struggling to achieve multi-wavelength routing. The wavelength routing optical switch unit 100 uses thermo-optical or electro-optical effects for wavelength modulation, and the curved coupling section employs circular bending, Euler bending, Bessel bending, or polynomial interconnected circular (TOPIC) bending structures. In this invention, the waveguide materials in the wavelength-selective optical switch 300 and the waveguide interconnection network 200 are selected from silicon nitride (SiN), lithium niobate (LiNbO3), and / or silicon (Si).

[0048] The structure of the 2×2 optical switch in this embodiment is as follows: Figure 3 As shown, it incorporates four cascaded resonant structures 303, capable of routing four wavelength optical signals. The cascaded resonant structures 303 are as follows: Figure 4As shown, the coupling region 305 is located near the first waveguide 301 and the second waveguide 302 of the micro-ring resonator 304. Heating metal 306 is respectively arranged on both sides of the micro-ring resonator 304, and metal pads 307 of the heating metal 306 are arranged on the outer sides of the first waveguide 301 and the second waveguide 302, so as to modulate the wavelength through the thermo-optic effect. The wavelength resonance characteristics of the cascaded resonant structure 303 determine that the optical signal of a specific wavelength is output from the output end of the first waveguide 301 or the second waveguide 302.

[0049] This invention uses a wavelength routing optical switch unit 100 to select wavelengths, enabling the independent routing of any wavelength optical signal input from any input port 400 to any output port 500. The input port 400 and the output port 500 can respectively employ the following coupling methods to realize the input and output of optical signals: vertical grating coupler, end-face coupler, or coupling structure based on photonic wire bonding.

[0050] Multiple waveguide interconnection networks 200 are used to connect 2×2 optical switches between adjacent wavelength-routing optical switch units 100, realizing their cross-interconnection. The waveguide interconnection network 200 includes multiple optical waveguide cross structures and / or directly connected waveguides. The transmission waveguides between adjacent wavelength-routing optical switch units 100 cross, so optical waveguide cross structures are used to achieve low-loss, low-crosstalk optical signal transmission.

[0051] The optical waveguide cross structure includes multiple Y×Y optical waveguide cross structures, where Y ≥ 2. In this embodiment, Y is preferably 2 or 4, forming a 2×2 optical waveguide cross structure and a 4×4 optical waveguide cross structure, such as... Figure 6 and Figure 7 As shown, the Y×Y optical waveguide cross structure enables cross-connection of signal channels in the Benes network architecture. The optical signal entering the corresponding optical switch of the next unit through the Y×Y optical waveguide cross structure is determined by the network architecture. In other embodiments of the present invention, the optical waveguide cross structure can be configured as one of tapered waveguide cross (Taper type), multimode interference coupling cross (MMI type), or subwavelength grating waveguide cross (SWG type).

[0052] In this embodiment, the wavelength routing optical switch units 100 are cascaded through the waveguide interconnect network 200 according to the Benes network architecture to form an M×M×Nλ optical switch network chip. The number of wavelength routing optical switch units 100 is... The number of waveguide interconnects is 200. The input optical signal of any given route line passes through input port 400 to any output port 500, alternating between... One wavelength routing optical switch unit 100, and at most A cross structure of optical waveguides.

[0053] This embodiment uses a 16×16×4λ optical switch network chip as an example (i.e., M=16, N=4) to provide a detailed description of an optical switch network chip with multi-wavelength routing. For example... Figure 2 As shown, this 16×16×4λ optical switch network chip can transmit optical signals with up to 22 wavelengths. The 16 input ports 400 are denoted as Port I1, Port I2, ..., Port I16, and the 16 output ports 500 are denoted as Port O1, Port O2, ..., Port O16. This embodiment includes seven wavelength routing optical switch units 100, denoted as First Wavelength Routing Optical Switch Unit 11, Second Wavelength Routing Optical Switch Unit 12, ..., Seventh Wavelength Routing Optical Switch Unit 17. Each wavelength routing optical switch unit 100 includes eight 2×2 optical switches, denoted as First Optical Switch O1, Second Optical Switch O2, ..., Eighth Optical Switch O8. A total of six waveguide interconnect networks 200 are also provided, denoted as First Waveguide Interconnect Network 21, Second Waveguide Interconnect Network 22, ..., Sixth Waveguide Interconnect Network 26.

[0054] The connection method of the Benes network architecture is as follows: Figure 1 As shown, in the first wavelength routing optical switch unit 11, the 1st, 2nd, 3rd, 4th, ..., M / 2th 2×2 optical switches S 1,1 S 1,2 S 1,3 S 1,4 S 1,M / 2 The optical signal output from one of the output terminals is transmitted sequentially through the first waveguide interconnection network 21 to the 1st, 2nd, 3rd, ..., M / 4th 2×2 optical switches S in the second wavelength routing optical switch unit 12. 2,1 S 2,2 S 2,3 S 2,M / 4 The input terminals; the 1st, 2nd, 3rd, ..., M / 2th 2×2 optical switches S 1,1 S 1,2 S 1,3 S 1,M / 2-1 The optical signal output from the other output terminal is transmitted sequentially through the first waveguide interconnection network 21 to the M / 4+1, M / 4+2, ..., M / 2th 2×2 optical switches S in the second wavelength routing optical switch unit 12. 2,M / 4+1 S 2,M / 4+2 S 2,M / 2 The input terminal.

[0055] In the second wavelength routing optical switch unit 12, the 1st, 2nd, 3rd, ..., M / 4th 2×2 optical switches are grouped together, and the M / 4+1th, M / 4+2th, M / 4+3th, ..., M / 2th 2×2 optical switches are grouped together.

[0056] In the second wavelength routing optical switch unit 12, the 1st, 2nd, 3rd, 4th, ..., M / 4th 2×2 optical switches S 2,1 S 2,2 S 2,3 S 2,4 S 2,M / 4 The optical signal output from one of the output terminals is transmitted sequentially through the second waveguide interconnection network 22 to the 1st, 2nd, 3rd, ..., M / 8th 2×2 optical switches S in the third wavelength routing optical switch unit 13. 3,1 S 3,2 S 3,3 S 3,M / 8 The input terminals; the 1st, 2nd, 3rd, ..., M / 4th 2×2 optical switches S 1,1 S 1,2 S 1,3 S 1,M / 4 The optical signal output from the other output terminal is transmitted sequentially through the second waveguide interconnection network 22 to the M / 8+1, M / 8+2, ..., M / 4th 2×2 optical switches S in the third wavelength routing optical switch unit 13. 2,M / 8+1 S 2,M / 8+2 S 2,M / 4 The input terminal.

[0057] In the second wavelength routing optical switch unit 12, the M / 4+1, M / 4+2, M / 4+3, M / 4+4, ..., M / 2 2×2 optical switches S 2,M / 4+1 S 2,M / 4+2 S 2,M / 4+3 S 2,M / 4+4 S 2,M / 2 The optical signal output from one of the output terminals is transmitted sequentially through the second waveguide interconnection network 22 to the M / 4+1, M / 4+2, M / 4+3, ..., 3M / 8th 2×2 optical switches S in the third wavelength routing optical switch unit 13. 3,M / 4+1 S 3,M / 4+2 S 3,M / 4+3 S 3,3M / 8 The input terminals; the M / 4+1, M / 4+2, M / 4+3, ..., M / 2 2×2 optical switches S 2,M / 4+1 S 2,M / 4+2 S 2,M / 4+3 S 2,M / 2 The optical signal output from the other output terminal is transmitted sequentially through the second waveguide interconnection network 22 to the 3M / 8+1, 3M / 8+2, 3M / 8+3, ..., M / 2 2×2 optical switches S in the third wavelength routing optical switch unit 13. 3,3M / 8+1 S 3,3M / 8+2 S 3,3M / 8+3 S 3,M / 2 The input terminal.

[0058] Following this logic, the intermediate layer of the Benes network architecture will eventually form a 4×4 optical switching structure consisting of two 2×2 optical switches, such as... Figure 5 As shown, the Benes network architecture satisfies left-right mirror symmetry, and its input can be reversed to be used as the output, and the output can be used as the input.

[0059] In other embodiments of the present invention, PILOSS, Crossbar, and CLOS network architectures may be used instead of the Benes network architecture.

[0060] In this embodiment, a 16×16×4λ optical switch network chip is used to transmit optical signals comprising four wavelengths, denoted as λ1, λ2, λ3, and λ4. These wavelengths enter through any one of the 16 input ports 400, alternately passing through the wavelength routing optical switch unit 100 and the waveguide interconnect network 200. Finally, the four wavelengths are selectively output from any one of the 16 output ports 500, resulting in a single-wavelength optical signal. The four wavelengths of the optical signal can pass through any one of the 2×2 optical switches in each wavelength routing optical switch unit 100, with the 2×2 optical switches performing wavelength selection on the optical signal containing the four wavelengths.

[0061] Taking a transmission line as an example, optical signals containing four wavelengths are input through port I1. After wavelength selection by the first optical switch 01 of the first wavelength routing optical switch unit 11, the optical signals with wavelengths λ1 and λ2 are grouped together, and the optical signals with wavelengths λ3 and λ4 are grouped together. These signals then enter the first waveguide interconnection network 21 through the two outputs of the first optical switch 01, respectively. The first waveguide interconnection network 21 transmits the optical signals with wavelengths λ1 and λ2 to one input of the first optical switch 01 of the second wavelength routing optical switch unit 12, and transmits the optical signals with wavelengths λ3 and λ4 to one input of the fifth optical switch 05 of the second wavelength routing optical switch unit 12. After wavelength selection by the first optical switch 01 of the second wavelength routing optical switch unit 12, the optical signals with wavelengths λ1 and λ2 are transmitted to the second waveguide interconnection network 22 through their two outputs, and then enter the first optical switch 01 and the third optical switch 03 of the third wavelength routing optical switch unit 13, respectively. Subsequently, the optical signal with wavelength λ1 passes through the third waveguide interconnection network 23, the first optical switch 01 of the fourth wavelength routing optical switch unit 14, the fourth waveguide interconnection network 24, the first optical switch 01 of the fifth wavelength routing optical switch unit 15, the fifth waveguide interconnection network 25, the first optical switch 01 of the sixth wavelength routing optical switch unit 16, the sixth waveguide interconnection network 26, and the first optical switch 01 of the seventh wavelength routing optical switch unit 17, and is output from port O1. The optical signal with wavelength λ2 passes through the third waveguide interconnection network 23, the third optical switch 03 of the fourth wavelength routing optical switch unit 14, the third optical switch 03 of the fourth waveguide interconnection network 24, the third optical switch 03 of the fifth wavelength routing optical switch unit 15, the second optical switch 02 of the sixth wavelength routing optical switch unit 16, the sixth waveguide interconnection network 26, and the third optical switch 03 of the seventh wavelength routing optical switch unit 17, and is output from port O5.

[0062] Optical signals with wavelengths λ3 and λ4 are wavelength-selected by the fifth optical switch 05 of the second wavelength routing optical switch unit 12, and then transmitted to the second waveguide interconnection network 22 through its two output terminals, respectively, and enter the fifth optical switch 05 and the seventh optical switch 07 in the third wavelength routing optical switch unit 13. Subsequently, the optical signal with wavelength λ3 passes through the third waveguide interconnection network 23, the fifth optical switch 05 of the fourth wavelength routing optical switch unit 14, the fourth waveguide interconnection network 24, the sixth optical switch 06 of the fifth wavelength routing optical switch unit 15, the fifth waveguide interconnection network 25, the seventh optical switch 07 of the sixth wavelength routing optical switch unit 16, the sixth waveguide interconnection network 26, and the fifth optical switch 05 of the seventh wavelength routing optical switch unit 17, and is output from port O9. The optical signal with wavelength λ4 passes sequentially through the third waveguide interconnection network 23, the eighth optical switch 08 of the fourth wavelength routing optical switch unit 14, the fourth waveguide interconnection network 24, the seventh optical switch 07 of the fifth wavelength routing optical switch unit 15, the fifth waveguide interconnection network 25, the eighth optical switch 08 of the sixth wavelength routing optical switch unit 16, the sixth waveguide interconnection network 26, and the seventh optical switch 07 of the seventh wavelength routing optical switch unit 17, before being output from port O14, thus realizing one-to-many multi-wavelength routing optical signal transmission between input port 400 and output port 500. In other embodiments of the present invention, one-to-one and many-to-many multi-wavelength routing optical signal transmission can also be achieved through wavelength modulation.

[0063] The optical signal routing method of the present invention includes the following steps:

[0064] Step 1: Connect the control terminal of the wavelength selective optical switch 300 in the optical switch network chip with multi-wavelength routing function to an external control power supply. At the same time, connect the input port 400 to the external signal input optical fiber and the output port 500 to the external signal output optical fiber.

[0065] Step 2: Adjust the external control power supply to generate a control voltage, perform wavelength modulation, and select the operating wavelength of the wavelength selective optical switch 300.

[0066] Step 3: Input optical signals to one or more input ports 400 through the signal input optical fiber. The optical signals include at least one wavelength, and the operating wavelength of the wavelength selective optical switch 300 is matched with the wavelength of the optical signals.

[0067] Step 4: Multiple wavelength optical signals alternately pass through multiple wavelength routing optical switch units 100 and multiple waveguide interconnection networks 200, and are respectively routed to any output port 500 for output, realizing one-to-one, one-to-many or many-to-one multi-wavelength routing optical signal transmission.

Claims

1. An optical switch network chip with multi-wavelength routing function, characterized in that: It includes M input ports (400), M output ports (500), multiple wavelength routing optical switch units (100) arranged sequentially between the input ports (400) and the output ports (500), and multiple waveguide interconnection networks (200) that connect adjacent wavelength routing optical switch units (100), wherein M≥2; Each wavelength routing optical switch unit (100) includes multiple wavelength selective optical switches (300) for wavelength selection and output, and the control terminal of each wavelength selective optical switch (300) is connected to an external control power supply. In the multiple wavelength routing optical switch units (100), the input terminals of each wavelength selective optical switch (300) of the wavelength routing optical switch unit (100) located at one end are respectively connected to M input ports (400); in the wavelength routing optical switch unit (100) located at the other end, the output terminals of each wavelength selective optical switch (300) are respectively connected to M output ports (500). Wavelength-selective optical switches (300) between adjacent wavelength-routing optical switch units (100) are cascaded through a waveguide interconnection network (200); The optical signal input at any input port (400) alternately passes through multiple wavelength routing optical switch units (100) and multiple waveguide interconnection networks (200) and is routed to any output port (500) for output.

2. The optical switch network chip with multi-wavelength routing function according to claim 1, characterized in that: The waveguide interconnection network (200) includes multiple optical waveguide cross structures and / or directly connected waveguides; The optical waveguide cross structure is configured as a Y×Y optical waveguide cross structure, where Y≥2; or, the optical waveguide cross structure is configured as one of a tapered gradient waveguide cross, a multimode interference coupling cross, or a subwavelength grating waveguide cross.

3. The optical switch network chip with multi-wavelength routing function according to claim 2, characterized in that: The wavelength-selective optical switch (300) is a 2×2 optical switch.

4. The optical switch network chip with multi-wavelength routing function according to claim 3, characterized in that: The wavelength-selective optical switch (300) includes a first waveguide (301) and a second waveguide (302) arranged in parallel, and N sets of cascaded resonant structures (303) arranged sequentially between the first waveguide (301) and the second waveguide (302) along the waveguide length direction; each set of cascaded resonant structures (303) includes J cascaded optical micro-resonators, where N≥1 and J is an even number; In each cascaded resonant structure (303), the optical micro-resonators at both ends are coupled to the first waveguide (301) and the second waveguide (302), respectively.

5. The optical switch network chip with multi-wavelength routing function according to claim 4, characterized in that: The first waveguide (301) and the second waveguide (302) are respectively provided with bent coupling parts for coupling with the corresponding cascaded resonant structure (303). The bent coupling parts adopt circular bending, Euler bending, Bessel bending or polynomial interconnected circular bending structure. The wavelength-selective optical switch (300) modulates the wavelength through thermo-optical or electro-optical effects.

6. The optical switch network chip with multi-wavelength routing function according to claim 5, characterized in that: The optical micro-resonator is a micro-ring resonator or a micro-disk resonator. J=2; The N=4; The Y=2 and / or Y=4.

7. The optical switch network chip with multi-wavelength routing function according to any one of claims 1-6, characterized in that: Multiple wavelength routing optical switch units (100) are cascaded according to the Benes network architecture; The number of wavelength routing optical switch units (100) is set to The number of waveguide interconnects (200) is set to indivual.

8. The optical switch network chip with multi-wavelength routing function according to claim 7, characterized in that: The input port (400) and output port (500) are respectively configured as vertical grating couplers, end face couplers, or coupling structures based on photonic wire bonding; The waveguides in the wavelength-selective optical switch (300) and waveguide interconnection network (200) are made of silicon nitride, lithium niobate and / or silicon materials.

9. An optical signal routing method, characterized in that, Includes the following steps: Step 1: Connect the optical switch network chip with multi-wavelength routing function as described in claim 1 to an external control power supply, and connect the input port (400) to the external signal input optical fiber and the output port (500) to the external signal output optical fiber respectively. Step 2: Adjust the external control power supply to generate control voltage, perform wavelength modulation, and select the operating wavelength of the wavelength selective optical switch (300); Step 3: Input optical signals to one or more input ports (400) through the signal input optical fiber, wherein the optical signals include at least one wavelength; Step 4: Multiple wavelength optical signals alternately pass through multiple wavelength routing optical switch units (100) and multiple waveguide interconnection networks (200) and are routed to any output port (500) for output, thereby realizing one-to-one, one-to-many or many-to-one multi-wavelength routing optical signal transmission.

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