Tạo tín hiệu ngẫu nhiên bằng bộ liên kết bán phi tuyến
203 lượt xemDOI:
https://doi.org/10.54939/1859-1043.j.mst.89.2023.94-102Từ khóa:
Quang học phi tuyến; Bộ ghép phi tuyến; Thông tin quang không dây; Thông tin trong không gian tự do; Bảo mật thông tin.Tóm tắt
Bộ liên kết bán phi tuyến (SNC) được sử dụng để tách tín hiệu quang thành hai tín hiệu có biên độ khác nhau và định hình lại một loạt tín hiệu. Các ứng dụng được đề cập dựa trên sự phụ thuộc đơn điệu của các hệ số truyền vào cường độ đầu vào, thay đổi trong một khoảng thời gian. Trong bài báo này, chúng tôi chỉ ra rằng có một khoảng cường độ đầu vào nhất định, trong đó các hệ số truyền tải trùng nhau. Những đặc điểm này của SNC có thể được sử dụng để tạo tín hiệu ngẫu nhiên. Sử dụng biểu thức mô tả mối quan hệ công suất đầu ra-đầu vào, biểu thức của tín hiệu trộn lẫn quang học, tín hiệu sóng mang và tín hiệu sóng mang được mã hóa, vùng chồng lấn của cường độ đầu vào được quan sát bằng số. Do đó, các tín hiệu ngẫu nhiên được mô phỏng. Các tín hiệu thu được sẽ được thảo luận để chỉ ra cơ hội sử dụng chúng cho bảo mật thông tin của truyền thông quang không dây hoặc không gian tự do trong tương lai.
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