The Research of Near-Infrared Electro-Optics Modulation Coding Technology

近紅外線光電調制技術的研究

陳德請(Der-Chin Chen) ； 李世文(Shih-Wen Lee) ； 卓葆軒(Zhuo-Bao Xuan)

《中華科技大學學報》 50期 (2012/01) Pp. 77-88

https://doi.org/10.7095/JCUST.201201.0076

摘要

近紅外光空間調制系統係由（1）近紅外光空間調制、（2）觸發時間變化的光空間調制器、及（3）近紅外光源（LED）脈衝調變……等三項技術所結合的三度空間調制技術，係一種進行近紅外光資料調變與解調及加/解密的創新方法。利用光藕合元件將脈衝調變光藕合至光纖和光空間調制器，此信號被解調端的光檢知器偵測由後端電路進行解調。因為使用可以變化三種孔徑大小的光圈及三種工作週期的光波信號，這個系統根據這樣組合共有27種編碼方式。經實驗結果本系統的通訊誤差在0.2%以內。本系統優點為因為使用光源具單色光特性不比必使用濾光片，使用光學編碼所以具保密性與安全性，又不容易被電磁干擾。

關鍵字

誤碼率 ； 光空間調制器 ； 近紅外光

並列摘要

In this paper we demonstrate a new technology in which we use the optical modulation, trigger duration modulation of the optical modulator, and light source (LED、LD) pulse modulation to build the near-infrared electro-optics modulation coding system. Using the optical coupler to let the pulse modulation near infrared (NIR) light enter into an optical fiber and optical modulator device, the electro-optics modulation coding signal is then detected by the photodiode. Because of using three changeable bore sizes of aperture module and three duty cycles' light wave signals. According to the arrangement, there are 27 kinds of coding modes in this system. The communication error rate of the modulation coding system is less than 0.2%. There are some advantages in the system: (1) Using pulse modulation LED light source, there are no optical filters required necessary. (2) Because of optical coding, data transmission has high security and low error.

並列關鍵字

error rate ； optical modulator ； near infrared