Sequence-Inversion-Keyed Optical CDMA Coding/Decoding Scheme Using an Electrooptic Phase Modulator and Fiber Bragg Grating Arrays
Sequence-Inversion-Keyed Optical CDMA Coding/Decoding Scheme Using an Electrooptic Phase Modulator and Fiber Bragg Grating Arrays
复制标题
使用电光相位调制器和光纤布拉格光栅阵列的序列反转键控光学 CDMA 编码/解码方案
DOI：
10.1109/jstqe.2007.897604
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发表时间：
2007
影响因子：
4.9
通讯作者：
J. Yao
中科院分区：
文献类型：
--
作者：
F. Zeng;Qing Wang;J. Yao
提出了一种新的实现光码分多址（CDMA）单极性编码/双极性解码的方法。在该系统中，一个电光相位调制器（EOPM）和两个光纤光栅（FBG）阵列。在发射端，低速率的数据序列通过EOPM对光载波进行相位调制，然后通过编码器FBG阵列以单极方式将其波长映射到高速率的光相位序列。在接收器处，第二FBG阵列充当一系列频率鉴别器以将相位调制的光信号转换为强度调制的信号，以及匹配滤波器以执行光解码。双极解码是通过将光载波定位在解码器的反射响应的正斜率或负斜率处来实现的。所提出的编码/解码方案是等效的序列反转键控（SIK-CDMA），它有可能提供一个改进的性能相比，传统的非相干方案，使用光正交码。理论和实验研究所提出的SIK计划。
We propose a novel approach for implementing unipolar-encoding/bipolar-decoding for optical code division multiple access (CDMA). In the proposed system, an electrooptic phase modulator (EOPM) and two fiber Bragg grating (FBG) arrays are employed. At the transmitter, a low-bit-rate data sequence modulates the phase of optical carriers by the EOPM, and is then wavelength-mapped to a high-bit-rate optical phase sequence by the encoder FBG array in a unipolar way. At the receiver, the second FBG array acts as a series of frequency discriminators to convert the phase-modulated optical signals to intensity-modulated signals, as well as a matched filter to perform optical decoding. Bipolar decoding is achieved by locating the optical carriers at either the positive or the negative slopes of the reflection responses of the decoder. The proposed encoding/decoding scheme is equivalent to a sequence-inversion-keyed (SIK) CDMA, which has the potential to provide an improved performance compared with the conventional incoherent scheme using optical orthogonal codes. Both theoretical and experimental studies of the proposed SIK scheme are presented.