Core Pain Points

• Waste of Fiber Optic Resources: Traditional quantum communication systems require separate fiber optic cables for quantum channels, classical channels, and synchronization channels, leading to problems such as resource waste, high project costs, long deployment cycles, and difficult maintenance.
• Risk of Channel Crosstalk: The single-photon signals transmitted in quantum channels have extremely low power, while classical channels and synchronization channels are high-intensity optical signals. If the channel isolation is insufficient, crosstalk is likely to occur, affecting single-photon detection, leading to a surge in the quantum key bit error rate (BER), and compromising communication security. At the same time, there are also hidden crosstalk risks between multiple classical channels.
• High Requirement for Synchronization Accuracy: Quantum key distribution systems have extremely high requirements for the timing alignment accuracy of transceivers. If the synchronization channel is laid with separate fibers, it is susceptible to fluctuations in transmission delay; if multiplexed with classical channels, it is prone to signal interference and timing offset, which affect communication security.

Technical Principles

1. Plug-in active quantum communication WDM-VOA board: Suitable for 1U/2U/4U chassis, supports VOA attenuation adjustment for multiple ports, can accurately adjust classical channels and synchronization channels, and flexibly control their power.
2. 1U rack-mounted passive quantum communication WDM equipment.

Product Features

• Port Type Advantage: All ports adopt FC/APC connectors. The FC/APC interface has characteristics such as ultra-low insertion loss, ultra-low reflection, ultra-high return loss, strong mechanical stability, and excellent environmental adaptability. It is extremely suitable for quantum communication, which has high requirements for return loss and needs to prevent reflected light from interfering with single-photon detectors.
• Channel Quantity Advantage: It supports 2 bidirectional classical channel transmissions, 1 unidirectional quantum channel transmission, and 1 unidirectional synchronization channel transmission. Multiple different channels realize single-fiber co-fiber transmission, effectively saving resources and increasing bandwidth.
• Anti-channel Crosstalk Advantage: Adopting a multi-layer anti-crosstalk design and selecting high-precision thin-film filter components, the isolation between quantum channels and other channels is >100dB, which effectively blocks the crosstalk of high-intensity optical signals to quantum channels and avoids affecting single-photon detection.
• Low Insertion Loss Advantage: The insertion loss of quantum channels is <1.5dB, and the insertion loss of classical channels is <2.0dB, which meets the power budget requirements for long-distance transmission of quantum communication.
• VOA Adjustable Advantage: The active version of the quantum communication WDM-VOA board supports VOA attenuation adjustment for classical channels and synchronization channels, accurately controlling the power of each signal to meet the power and precision requirements of quantum communication links.

Core Functions

• Precise Multiplexing/Demultiplexing of Multi-channels: It realizes efficient combination and separation of multiple channels, ensuring independent transmission of signals in each channel. Among them, each classical channel is accurately matched with optical modules through two-wavelength pairing to achieve high-bandwidth single-fiber bidirectional transmission of services.
• Real-time Channel Power Monitoring (WDM-VOA): It adopts dual probes to real-time detect the input optical power and output optical power of VOA. The optical power identification is accurate to 0.1dB, and real-time power information can be queried by directly accessing the WEB network management through a browser.
• Adjustable VOA Power (WDM-VOA): Both ends support VOA attenuation adjustment for a total of 5 ports of classical channels and synchronization channels through network management, with an adjustment step of 0.1dB.

1U passive quantum communication WDM equipment

Plug-in card type active quantum communication WDM-VOA board card

Application Scenarios

• Metropolitan Quantum Secure Communication Network: In the deployment of quantum communication networks within urban areas, this product solves the problems of tight fiber optic resources, high traditional laying costs, and large bandwidth demand for classical services. Through multi-channel co-fiber transmission, it meets the access requirements of multi-user quantum secure communication between stations.
• Quantum Secure Interconnection of Data Centers: In the secure interconnection of data centers, this product, with its low loss and high stability characteristics, solves the problems of tight link budget and high requirements for channel stability, realizing quantum secure interconnection between data centers and balancing security, bandwidth, and transmission stability.
• Quantum Secure Communication System for the Financial Industry: The financial industry has extremely high requirements for data transmission security and bandwidth. This product can be deployed between head offices and branch offices. It generates secure keys through quantum channels, and 2 bidirectional classical channels transmit encrypted data at high speed. While ensuring the absolute security of financial data, it meets the requirements of large bandwidth and bidirectional transmission for financial services, and avoids the risks of data leakage and cracking.
• Quantum Secure Communication Scenarios for Government and Military Industries: The transmission of sensitive documents by government departments and the exchange of classified information in the military field have strict requirements for communication security and stability. The high isolation and high reliability of this product can ensure the stable operation of the quantum communication system in complex environments and support the secure transmission of classified information.
• Quantum Secure Communication Networking for Power Grids: As a key national infrastructure, the security of power grids is related to national security. This product can be deployed in the links between important power supply nodes to meet the high requirements for stability and security of quantum secure communication in complex environments, and ensure the absolute security of core business data such as distribution automation.

Classic applications for 1U devices

The classic application of the card-insertion type WDM-VOA

Summary