KHẢO SÁT HIỆU NĂNG (BER, SNR) CỦA HỆ THỐNG TRUYỀN DẪN QUANG-VÔ TUYẾN TƯƠNG TỰ (ARoF) VÀ SỐ (DRoF)

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Tác giả: Văn Tuấn Nguyễn

Ngôn ngữ: Vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ Đại học Thái Nguyên, 2020

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ID: 421940

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Bài báo trình bày mô hình tiêu biểu của 2 hệ thống truyền dẫn tín hiệu vô tuyến qua sợi quang tương tự ARoF (Analog Radio-over-Fiber) và số DRoF (Digital Radio-over-Fiber) với khoảng cách truyền dẫn d ≤120 km
trình bày tỉ số công suất tín hiệu trên nhiễu (SNR) và tỉ lệ lỗi bít (BER) trong 2 hệ thống. Trên cơ sở đó, bài báo sử dụng Matlab để vẽ các đồ thị và so sánh hiệu năng của 2 hệ thống theo các kiểu tách sóng trực tiếp và kết hợp sử dụng các phương pháp giải điều chế khác nhau như ASK, FSK, PSK bao gồm các kỹ thuật đổi tần đồng bộ, đổi tần không đồng bộ và đồng tần. Việc so sánh được tiến hành theo nhiều trường hợp khác nhau như thay đổi công suất nguồn phát quang (PTX), d và công suất quang của bộ dao động nội (PLO). Bài báo đã xác định được một cách định lượng mức độ cải thiện BER của hệ thống DRoF so với ARoF khi chúng có cùng giá trị của các thông số hệ thống. Tiêu biểu, với d = 90 km và PTX = 1 dBm, ARoF tách sóng trực tiếp có BER»10-10 thì DRoF có BER được cải thiện đáng kể (BER»10-23). Còn đối với cấu hình PSK đổi tần đồng bộ, tách sóng kết hợp với d = 100 km, PLO = 3 dBm thì hệ thống ARoF và DRoF có các giá trị lần lượt là BER»10-18 và BER»10-23, Tóm tắt tiếng anh, In this paper, we present two typical models of Analog Radio-over-Fiber (ARoF) and Digital Radio-over-Fiber (DRoF) systems that transmission distance is shorter than 120 km. Signal-to-noise ratio (SNR) and bit error rate (BER) in two systems are shown. Matlab-based programme then is written and run to draw graphs and compare the performance (BERSNR) of two systems corresponding to direct detection and coherent detection for various demodulation methods such as ASK, FSK, PSK including synchronous, asynchronous heterodyne and homodyne techniques. The performance comparison of the two systems is conducted in many different cases such as changing optical power of transmitter (PTX), transmission distance (d), optical power of local oscillator (PLO). We quantitatively determine the BER improvement of DRoF system compared to ARoF when they have the same value of system parameters. Typically, with d = 90 km and PTX = 1 dBm, Direction-Detection ARoF system has BER value of »10-10, DRoF system has a greatly improved BER value (BER »10-23). As for Coherent-Detection synchronous heterodyne PSK configuration with d = 100 km, PLO = 3 dBm, ARoF and DRoF systems achieve BER value of »10-18 and of »10-23 respectively.

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