本論文中,我們的研究目的是應用光分碼多工擷取(Optical Code Division Multiple Access,OCDMA)技術於類比/數位信號的傳輸。在光分碼多工擷取系統之中,主要的編/解碼(Codec)元件是採用陣列波導光柵(Array Waveguide Grating,AWG)。因此,我們可以根據每位使用者所分配的碼字進行不同的編碼,以設計出簡單的系統架構。 本研究中,首先要傳送的類比/數位信號是經由電光調變器(Electro Optical Modulator,EOM)所調變。對應的光信號將會出現在每個電光調變器的輸出端。然而,光信號送至陣列波導光柵進行編碼,其後通過星狀耦合器並分配至所有的解碼器上。對解碼的過程,所接收的光信號是被解碼並從中擷取出對應的信息。而且,我們可以從具備良好正交性的頻譜振幅編碼(Spectral Amplitude Coding,SAC)方式中,有效減輕多重擷取干擾(Multiple Access Interference,MAI)的影響。
This paper attempts to apply the optical code division multiple access (OCDMA) into the analog- and digital-signal transmission. In the OCDMA system, the primary codec components is the array waveguide grating (AWG), so we can process different codes according to the code letters distributed to different users to design a simple system framework. In this research, the primary analog- and digital-signal to be transmitted is modulated by the electro optical modulator (EOM). The corresponding optical signals appear in the output terminal of each EOM and are then transmitted to AWG for encoding, then again allocated to all decoders via star couplers. As for the decoding process, the received optical signals are decoded, allowing data access to be completed. Moreover, through the spectral amplitude coding (SAC) with fine orthogonality, the effects of the Multiple Access Inference (MAI) can be effectively reduced.