Multi-channel optical communication system based on edge emission coherent array laser

Abstract

The invention discloses a multi-channel optical communication system based on an edge emission coherent array laser, which relates to the technical field of communication and comprises an edge emission coherent array laser, an interference type modulator, a polarization multiplexing module, a merging module and a receiving end, the edge emission coherent array laser is used for generating a preset number of paths of independent laser signals; the interferometric modulator performs phase or amplitude modulation on the laser signal; the polarization multiplexing module carries out polarization control on the partially or completely modulated optical signal, independently carries out QPSK modulation for dual polarization states, and carries out separation and combination of the dual polarization states; the merging module is used for merging the modulated optical signals and outputting the merged optical signals to a receiving end; and the receiving end separates the received optical signal and performs coherent detection based on the local reference signal to complete optical communication. According to the technical scheme, parallel transmission of multi-channel laser signals can be supported, the bandwidth density is remarkably improved, and the whole system is high in integration degree, small in size and low in power consumption.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a multi-channel optical communication system based on edge-emitting coherent array lasers. Background Art

[0002] Currently, optical communication systems typically use a single laser source or simple multiplexing schemes, which are difficult to meet the needs of high-speed, high-density transmission. Traditional coherent optical communication systems have limitations in multi-channel integration and low modulation efficiency, resulting in large system size, high power consumption, and high cost. Specifically, there are the following problems:

[0003] (1) The multi-channel laser source has low integration and is difficult to miniaturize;

[0004] (2) The modulator structure is simple and cannot support high-density parallel transmission;

[0005] (3) The system is highly complex and the cost is high. Summary of the Invention

[0006] In response to the above problems, the present invention provides a multi-channel optical communication system based on edge-emitting coherent array lasers. Through the synchronous output of laser signals from the edge-emitting coherent array lasers and the modulation of the interferometric modulator, it can support the parallel transmission of multi-channel laser signals. Through the polarization control of the polarization multiplexing module and the merging of the merging modules, it can significantly improve the bandwidth density. The entire system has high integration, small size, and low power consumption, and can be applied to high-bandwidth application scenarios such as data centers, photonic computing, and lidar.

[0007] To achieve the above-mentioned object, the present invention provides a multi-channel optical communication system based on an edge-emitting coherent array laser, comprising: an edge-emitting coherent array laser, an interferometric modulator, a polarization multiplexing module, a combining module and a receiving end;

[0008] The edge-emitting coherent array laser is used to generate a preset number of independent laser signals;

[0009] The interferometric modulator performs phase or amplitude modulation on the laser signal respectively;

[0010] The polarization multiplexing module performs polarization control on part or all of the modulated optical signals, and independently performs QPSK modulation on the dual polarization states TE and TM, thereby realizing separation and merging of the dual polarization states;

[0011] The combining module combines the modulated optical signals through wavelength division multiplexing and space division multiplexing and outputs the combined signals to the receiving end;

[0012] The receiving end separates the received optical signal and performs coherent detection based on the local reference signal to complete the optical communication.

[0013] In the above technical solution, preferably, the edge-emitting coherent array laser adopts an integrated coherent array laser, and the output laser signal maintains frequency and phase synchronization.

[0014] In the above technical solution, preferably, the interferometric modulator adopts thin film lithium niobate, silicon photonics or indium phosphide material, and supports a modulation bandwidth of at least 50 GHz. The number of the interferometric modulators is equal to the number of the laser signal paths, and each group of the interferometric modulators corresponds to one laser signal path.

[0015] In the above technical solution, preferably, the merging module is used to merge the modulated optical signals of all paths into one optical signal.

[0016] In the above technical solution, preferably, the receiving end includes a wave splitting module and a coherent detection module, and the wave splitting module is used to separate the optical signal and restore each channel;

[0017] The coherent detection module is used to perform coherent detection on the optical signal based on the local reference signal to achieve signal demodulation.

[0018] In the above technical solution, preferably, the local reference signal is generated in the following manner:

[0019] Generated by one of the independent laser signals generated by the edge-emitting coherent array laser, or,

[0020] Generated by an externally introduced independent laser signal, or,

[0021] It is obtained by filtering and attenuating part of the optical signal in a data channel.

[0022] In the above technical solution, preferably, the coherent detection adopts self-homodyne detection, heterodyne detection or same-frequency homodyne detection.

[0023] In the above technical solution, preferably, the lasers in the edge-emitting coherent array lasers are arranged linearly, in a two-dimensional matrix, or in a polygonal arrangement.

[0024] In the above technical solution, preferably, the edge-emitting coherent array laser, the interferometric modulator, the polarization multiplexing module and the merging module are integrated on the same optical chip.

[0025] Compared with the existing technology, the beneficial effects of the present invention are: through the synchronous output of the laser signal of the edge-emitting coherent array laser and the modulation of the interferometric modulator, it can support the parallel transmission of multi-channel laser signals; through the polarization control of the polarization multiplexing module and the merging of the merging module, the bandwidth density is significantly improved; the entire system has high integration, small size, and low power consumption, and can be applied to high-bandwidth application scenarios such as data centers, photonic computing, and lidar. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the overall architecture of a multi-channel optical communication system based on edge-emitting coherent array lasers disclosed in one embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of an edge-emitting coherent array laser disclosed in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the packaging structure of an interferometric modulator disclosed in one embodiment of the present invention;

[0029] Figure 4 A schematic diagram of the principle of a polarization multiplexing module disclosed in an embodiment of the present invention;

[0030] Figure 5 This is a schematic structural diagram of a merging module and a receiving end disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] The present invention is described in further detail below with reference to the accompanying drawings:

[0033] like Figure 1 As shown, a multi-channel optical communication system based on an edge-emitting coherent array laser provided by the present invention includes: an edge-emitting coherent array laser, an interferometric modulator, a polarization multiplexing module, a combining module and a receiving end;

[0034] The edge-emitting coherent array laser is used to generate a preset number of independent laser signals;

[0035] The interferometric modulator modulates the phase or amplitude of the laser signal respectively;

[0036] The polarization multiplexing module controls the polarization of part or all of the modulated optical signals, and independently performs QPSK modulation on the dual polarization states TE and TM, thereby achieving separation and merging of the dual polarization states.

[0037] The combining module combines the modulated optical signals through wavelength division multiplexing and space division multiplexing and outputs them to the receiving end;

[0038] The receiving end separates the received optical signals and performs coherent detection based on the local reference signal to complete optical communication.

[0039] In this embodiment, the synchronous output of the laser signal of the edge-emitting coherent array laser and the modulation of the interferometric modulator can support the parallel transmission of multi-channel laser signals. The polarization control of the polarization multiplexing module and the merging of the merging modules can significantly improve the bandwidth density. The entire system has high integration, small size and low power consumption, and can be applied to high-bandwidth application scenarios such as data centers, photonic computing, and lidar.

[0040] Specifically, an edge-emitting coherent laser array generates at least N independent laser signals. The output light is emitted from the edge of the chip and modulated by a high-speed interferometric modulator. A polarization multiplexing module then controls the polarization of the modulated optical signal, increasing channel capacity. A combining module then combines the multiple optical signals and outputs them to the receiver, which performs signal processing, completing the entire optical communication process.

[0041] like Figure 2 As shown, in the above embodiment, preferably, the edge-emitting coherent array laser adopts an integrated coherent array laser, which is integrated on the same chip. Based on its edge-emitting structure, the laser signal is output from the side of the chip, and the output laser signal maintains frequency and phase synchronization.

[0042] like Figure 3 As shown, in the above embodiment, the interferometric modulator preferably uses thin-film lithium niobate, silicon photonics, or indium phosphide materials and supports a modulation bandwidth of at least 50 Hz. The interferometric modulator can employ a standard Mach-Zehnder interferometer structure and employ control electrodes for applying a modulation voltage. The number of interferometric modulators is equal to the number of laser signal paths, and each group of interferometric modulators corresponds to one laser signal path, i.e., each laser signal path corresponds to one modulator.

[0043] like Figure 4 As shown, in the above embodiment, preferably, the polarization multiplexing module independently performs QPSK modulation on the dual polarization states TE and TM, thereby realizing separation and merging of the dual polarization states.

[0044] like Figure 5As shown, in the above embodiment, preferably, the combining module combines the optical signals by wavelength division multiplexing (WDM) and space division multiplexing (SDM), and the total bandwidth can reach more than 12.8 Tbps.

[0045] In the above embodiment, preferably, the combining module is used to combine the modulated optical signals of all paths into one optical signal.

[0046] like Figure 5 As shown, in the above embodiment, preferably, the receiving end includes a wave splitting module and a coherent detection module. The wave splitting module is used to separate the optical signal and restore each channel. The coherent detection module is used to perform coherent detection on the optical signal based on a local reference signal (such as local oscillator light LO) to achieve signal demodulation.

[0047] In the above implementation, preferably, the local reference signal is generated in the following manner:

[0048] Generated by one of the independent laser signals generated by an edge-emitting coherent array laser, or,

[0049] Generated by an externally introduced independent laser signal, or,

[0050] It is obtained by filtering and attenuating part of the optical signal in a data channel.

[0051] In the above embodiment, preferably, the coherent detection adopts self-homodyne detection, heterodyne detection or same-frequency homodyne detection.

[0052] In the above embodiment, preferably, the lasers in the edge-emitting coherent array laser are arranged in a linear arrangement, a two-dimensional matrix arrangement, or a polygonal arrangement.

[0053] In the above embodiment, preferably, the edge-emitting coherent array laser, the interferometric modulator, the polarization multiplexing module and the merging module are integrated on the same optical chip.

[0054] The multi-channel optical communication system based on edge-emitting coherent array lasers disclosed in the above embodiment can be implemented in the following manner:

[0055] Example 1: 8-channel system based on thin-film lithium niobate modulator

[0056] The system utilizes an InP base-edge emitting coherent laser array, integrating eight DFB laser units. Each channel delivers approximately 5mW of output power, a linewidth of <1MHz, and a frequency spacing of 100GHz. Each laser channel is connected to a thin-film lithium niobate MZI modulator, supporting QPSK modulation, a modulation bandwidth of >50GHz, and an insertion loss of <3dB. The system supports WDM+SDM multiplexing, with a total bandwidth of 800Gbps.

[0057] Example 2: 16×2 channel system with polarization multiplexing

[0058] Based on Example 1, a polarization multiplexing module is added after each modulation channel to implement dual-polarization QPSK modulation, doubling the bandwidth of each channel to 200Gbps and increasing the total bandwidth to 3.2Tbps. The receiving end uses co-frequency homodyne coherent detection and cooperates with DSP for polarization demultiplexing and channel compensation.

[0059] The multi-channel optical communication system based on edge-emitting coherent array lasers disclosed in the above embodiment is suitable for the following typical application scenarios:

[0060] (1) Data Center Interconnection: used for high-speed parallel connections between servers and switches to improve network bandwidth density;

[0061] (2) Photonic computing system: As a high-speed optical interconnect interface, it supports data interaction between large-scale photonic chips;

[0062] (3) LiDAR system: used for multi-channel beam scanning and signal modulation to improve detection accuracy and response speed.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multi-channel optical communication system based on edge-emitting coherent array lasers, characterized in that: include: Edge-emitting coherent array lasers, interferometric modulators, polarization multiplexing modules, combining modules, and receivers; The edge-emitting coherent array laser is used to generate a preset number of independent laser signals; The interferometric modulator performs phase or amplitude modulation on the laser signal respectively; The polarization multiplexing module performs polarization control on part or all of the modulated optical signals, and independently performs QPSK modulation on the dual polarization states TE and TM, thereby realizing separation and merging of the dual polarization states; The combining module combines the modulated optical signals through wavelength division multiplexing and space division multiplexing and outputs the combined signals to the receiving end; The receiving end separates the received optical signal and performs coherent detection based on the local reference signal to complete the optical communication.

2. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 1, characterized in that: The edge-emitting coherent array laser adopts an integrated coherent array laser, and the output laser signal maintains frequency and phase synchronization.

3. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 2, characterized in that: The interferometric modulators are made of thin-film lithium niobate, silicon photonics or indium phosphide materials and support a modulation bandwidth of at least 50 GHz. The number of the interferometric modulators is equal to the number of laser signal paths, and each group of the interferometric modulators corresponds to one laser signal path.

4. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 1, characterized in that: The merging module is used to merge the modulated optical signals of all paths into one optical signal.

5. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 1, characterized in that: The receiving end includes a wave splitting module and a coherent detection module, wherein the wave splitting module is used to separate the optical signal and restore each channel; The coherent detection module is used to perform coherent detection on the optical signal based on the local reference signal to achieve signal demodulation.

6. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 5, characterized in that: The local reference signal is generated as follows: Generated by one of the independent laser signals generated by the edge-emitting coherent array laser, or, Generated by an externally introduced independent laser signal, or, It is obtained by filtering and attenuating part of the optical signal in a data channel.

7. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 1, characterized in that: The coherent detection adopts self-homodyne detection, heterodyne detection or same-frequency homodyne detection.

8. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 1, characterized in that: The lasers in the edge-emitting coherent array laser are arranged in a linear manner, a two-dimensional matrix manner or a polygonal manner.

9. The multi-channel optical communication system based on edge-emitting coherent array lasers according to claim 5, characterized in that: The edge-emitting coherent array laser, the interferometric modulator, the polarization multiplexing module and the merging module are integrated on the same optical chip.

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